[syzbot] possible deadlock in _snd_pcm_stream_lock_irqsave (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: cb690f5238d7 Merge tag 'for-5.16/drivers-2021-11-09' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14db95c1b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9d7259f0deb293aa
dashboard link: https://syzkaller.appspot.com/bug?extid=58740f570d9b0dacf2a3
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+58740f...@syzkaller.appspotmail.com

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.15.0-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor.3/27804 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff88803102cd38 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1014 [inline]
ffff88803102cd38 (&new->fa_lock){....}-{2:2}, at: kill_fasync fs/fcntl.c:1035 [inline]
ffff88803102cd38 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x136/0x470 fs/fcntl.c:1028

and this task is already holding:
ffff88814af73948 (&timer->lock){....}-{2:2}, at: snd_timer_start1+0x5a/0x800 sound/core/timer.c:541
which would create a new lock dependency:
(&timer->lock){....}-{2:2} -> (&new->fa_lock){....}-{2:2}

but this new dependency connects a SOFTIRQ-irq-safe lock:
(&group->lock){..-.}-{2:2}

... which became SOFTIRQ-irq-safe at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170
snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848
loopback_jiffies_timer_function+0x1c4/0x240 sound/drivers/aloop.c:668
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
__debug_check_no_obj_freed lib/debugobjects.c:1002 [inline]
debug_check_no_obj_freed+0x20c/0x420 lib/debugobjects.c:1023
slab_free_hook mm/slub.c:1698 [inline]
slab_free_freelist_hook+0xeb/0x1c0 mm/slub.c:1749
slab_free mm/slub.c:3513 [inline]
kfree+0xf6/0x560 mm/slub.c:4561
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x65a/0x790 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
kfree_skb net/core/skbuff.c:774 [inline]
kfree_skb+0x133/0x3f0 net/core/skbuff.c:768
ieee80211_iface_work+0x411/0xd00 net/mac80211/iface.c:1522
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

to a SOFTIRQ-irq-unsafe lock:
(tasklist_lock){.+.+}-{2:2}

... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

other info that might help us debug this:

Chain exists of:
&group->lock --> &timer->lock --> tasklist_lock

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(tasklist_lock);
local_irq_disable();
lock(&group->lock);
lock(&timer->lock);
<Interrupt>
lock(&group->lock);

*** DEADLOCK ***

3 locks held by syz-executor.3/27804:
#0: ffff8880409bf568 (&tu->ioctl_lock){+.+.}-{3:3}, at: snd_timer_user_ioctl+0x4c/0xb0 sound/core/timer.c:2128
#1: ffff88814af73948 (&timer->lock){....}-{2:2}, at: snd_timer_start1+0x5a/0x800 sound/core/timer.c:541
#2: ffffffff8b983a20 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x41/0x470 fs/fcntl.c:1033

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&group->lock){..-.}-{2:2} {
IN-SOFTIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170
snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848
loopback_jiffies_timer_function+0x1c4/0x240 sound/drivers/aloop.c:668
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
__debug_check_no_obj_freed lib/debugobjects.c:1002 [inline]
debug_check_no_obj_freed+0x20c/0x420 lib/debugobjects.c:1023
slab_free_hook mm/slub.c:1698 [inline]
slab_free_freelist_hook+0xeb/0x1c0 mm/slub.c:1749
slab_free mm/slub.c:3513 [inline]
kfree+0xf6/0x560 mm/slub.c:4561
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x65a/0x790 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
kfree_skb net/core/skbuff.c:774 [inline]
kfree_skb+0x133/0x3f0 net/core/skbuff.c:768
ieee80211_iface_work+0x411/0xd00 net/mac80211/iface.c:1522
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x32/0x50 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:374 [inline]
snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline]
snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline]
snd_pcm_hw_params+0x12a/0x1990 sound/core/pcm_native.c:686
snd_pcm_kernel_ioctl+0x164/0x310 sound/core/pcm_native.c:3372
snd_pcm_oss_change_params_locked+0x1936/0x3a60 sound/core/oss/pcm_oss.c:947
snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1091 [inline]
snd_pcm_oss_get_active_substream+0x164/0x1c0 sound/core/oss/pcm_oss.c:1108
snd_pcm_oss_get_formats+0x75/0x340 sound/core/oss/pcm_oss.c:1830
snd_pcm_oss_set_format sound/core/oss/pcm_oss.c:1872 [inline]
snd_pcm_oss_ioctl+0x1034/0x3430 sound/core/oss/pcm_oss.c:2644
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90606fe0>] __key.9+0x0/0x40
-> (&timer->lock){....}-{2:2} {
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x32/0x50 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:374 [inline]
snd_timer_close_locked+0x63/0xbb0 sound/core/timer.c:396
snd_timer_close+0x87/0xf0 sound/core/timer.c:463
snd_seq_timer_close+0x8c/0xe0 sound/core/seq/seq_timer.c:326
queue_delete+0x4a/0xa0 sound/core/seq/seq_queue.c:134
snd_seq_queue_delete+0x45/0x60 sound/core/seq/seq_queue.c:196
snd_seq_kernel_client_ctl+0x102/0x1e0 sound/core/seq/seq_clientmgr.c:2369
delete_seq_queue.part.0.isra.0+0xa2/0x110 sound/core/seq/oss/seq_oss_init.c:377
delete_seq_queue sound/core/seq/oss/seq_oss_init.c:373 [inline]
snd_seq_oss_release+0x10b/0x1a0 sound/core/seq/oss/seq_oss_init.c:422
odev_release+0x4f/0x70 sound/core/seq/oss/seq_oss.c:144
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90606780>] __key.12+0x0/0x40
... acquired at:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
snd_timer_notify sound/core/timer.c:1087 [inline]
snd_timer_notify+0x10c/0x3d0 sound/core/timer.c:1074
snd_pcm_timer_notify sound/core/pcm_native.c:595 [inline]
snd_pcm_post_start+0x24a/0x310 sound/core/pcm_native.c:1392
snd_pcm_action_single sound/core/pcm_native.c:1229 [inline]
snd_pcm_action+0x143/0x170 sound/core/pcm_native.c:1310
__snd_pcm_lib_xfer+0x1633/0x1d80 sound/core/pcm_lib.c:2221
snd_pcm_oss_read3+0x1c4/0x400 sound/core/oss/pcm_oss.c:1267
snd_pcm_oss_read2+0x300/0x3f0 sound/core/oss/pcm_oss.c:1478
snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1525 [inline]
snd_pcm_oss_read+0x626/0x7b0 sound/core/oss/pcm_oss.c:2769
vfs_read+0x1b5/0x600 fs/read_write.c:479
ksys_read+0x12d/0x250 fs/read_write.c:619
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae


the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{2:2} {
HARDIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
SOFTIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:316
copy_process+0x36c0/0x75a0 kernel/fork.c:2310
kernel_clone+0xe7/0xab0 kernel/fork.c:2581
kernel_thread+0xb5/0xf0 kernel/fork.c:2633
rest_init+0x23/0x3e0 init/main.c:690
start_kernel+0x47a/0x49b init/main.c:1135
secondary_startup_64_no_verify+0xb0/0xbb
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
}
... key at: [<ffffffff8b60a098>] tasklist_lock+0x18/0x40
... acquired at:
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
send_sigio+0xab/0x380 fs/fcntl.c:810
kill_fasync_rcu fs/fcntl.c:1021 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x1f8/0x470 fs/fcntl.c:1028
sock_wake_async+0xd2/0x160 net/socket.c:1368
sk_wake_async include/net/sock.h:2400 [inline]
sk_wake_async include/net/sock.h:2396 [inline]
sock_def_readable+0x349/0x4e0 net/core/sock.c:3138
unix_dgram_sendmsg+0xfa7/0x1950 net/unix/af_unix.c:1941
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x331/0x810 net/socket.c:2409
___sys_sendmsg+0xf3/0x170 net/socket.c:2463
__sys_sendmmsg+0x195/0x470 net/socket.c:2549
__do_sys_sendmmsg net/socket.c:2578 [inline]
__se_sys_sendmmsg net/socket.c:2575 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2575
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&f->f_owner.lock){....}-{2:2} {
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:316
f_modown+0x2a/0x390 fs/fcntl.c:91
__f_setown fs/fcntl.c:110 [inline]
f_setown+0xd7/0x230 fs/fcntl.c:138
do_fcntl+0x749/0x1210 fs/fcntl.c:393
__do_sys_fcntl fs/fcntl.c:472 [inline]
__se_sys_fcntl fs/fcntl.c:457 [inline]
__x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:457
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock_irq include/linux/rwlock_api_smp.h:168 [inline]
_raw_read_lock_irq+0x63/0x80 kernel/locking/spinlock.c:244
f_getown+0x23/0x2a0 fs/fcntl.c:154
do_fcntl+0xbd8/0x1210 fs/fcntl.c:389
__do_sys_fcntl fs/fcntl.c:472 [inline]
__se_sys_fcntl fs/fcntl.c:457 [inline]
__x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:457
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90307de0>] __key.5+0x0/0x40
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
send_sigio+0x24/0x380 fs/fcntl.c:796
kill_fasync_rcu fs/fcntl.c:1021 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x1f8/0x470 fs/fcntl.c:1028
sock_wake_async+0xd2/0x160 net/socket.c:1368
sk_wake_async include/net/sock.h:2400 [inline]
sk_wake_async+0x108/0x290 include/net/sock.h:2396
unix_release_sock+0x79d/0xbc0 net/unix/af_unix.c:570
unix_release+0x84/0xe0 net/unix/af_unix.c:949
__sock_release+0xcd/0x280 net/socket.c:649
sock_close+0x18/0x20 net/socket.c:1314
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
get_signal+0x1b80/0x21d0 kernel/signal.c:2593
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&new->fa_lock){....}-{2:2} {
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:316
fasync_remove_entry+0xb6/0x1f0 fs/fcntl.c:891
fasync_helper+0x9e/0xb0 fs/fcntl.c:994
sock_fasync+0x94/0x140 net/socket.c:1339
__fput+0x846/0x9f0 fs/file_table.c:277
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1014 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x136/0x470 fs/fcntl.c:1028
sock_wake_async+0xd2/0x160 net/socket.c:1368
sk_wake_async include/net/sock.h:2400 [inline]
sk_wake_async+0x108/0x290 include/net/sock.h:2396
unix_release_sock+0x79d/0xbc0 net/unix/af_unix.c:570
unix_release+0x84/0xe0 net/unix/af_unix.c:949
__sock_release+0xcd/0x280 net/socket.c:649
sock_close+0x18/0x20 net/socket.c:1314
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
get_signal+0x1b80/0x21d0 kernel/signal.c:2593
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90308bc0>] __key.0+0x0/0x40
... acquired at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1014 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x136/0x470 fs/fcntl.c:1028
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1387
snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516
snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578
snd_timer_start sound/core/timer.c:697 [inline]
snd_timer_start sound/core/timer.c:690 [inline]
snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1985
__snd_timer_user_ioctl.isra.0+0xda8/0x2490 sound/core/timer.c:2108
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2129
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae


stack backtrace:
CPU: 1 PID: 27804 Comm: syz-executor.3 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_bad_irq_dependency kernel/locking/lockdep.c:2577 [inline]
check_irq_usage.cold+0x4c1/0x6b0 kernel/locking/lockdep.c:2816
check_prev_add kernel/locking/lockdep.c:3067 [inline]
check_prevs_add kernel/locking/lockdep.c:3186 [inline]
validate_chain kernel/locking/lockdep.c:3801 [inline]
__lock_acquire+0x2a1f/0x54a0 kernel/locking/lockdep.c:5027
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1014 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x136/0x470 fs/fcntl.c:1028
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1387
snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516
snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578
snd_timer_start sound/core/timer.c:697 [inline]
snd_timer_start sound/core/timer.c:690 [inline]
snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1985
__snd_timer_user_ioctl.isra.0+0xda8/0x2490 sound/core/timer.c:2108
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2129
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f927e7d2ae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f927bd48188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f927e8e5f60 RCX: 00007f927e7d2ae9
RDX: 0000000000000000 RSI: 00000000000054a0 RDI: 0000000000000003
RBP: 00007f927e82cf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcc9c48d0f R14: 00007f927bd48300 R15: 0000000000022000
</TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: a76c3d035872 Merge tag 'irq_urgent_for_v5.16_rc6' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1564a349b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=fa556098924b78f0

dashboard link: https://syzkaller.appspot.com/bug?extid=58740f570d9b0dacf2a3
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111bc7d5b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+58740f...@syzkaller.appspotmail.com

========================================================
WARNING: possible irq lock inversion dependency detected
5.16.0-rc5-syzkaller #0 Not tainted
--------------------------------------------------------
swapper/0/0 just changed the state of lock:
ffff8880226f5910 (&group->lock){..-.}-{2:2}, at: _snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170 sound/core/pcm_native.c:170
but this lock took another, SOFTIRQ-READ-unsafe lock in the past:

(tasklist_lock){.+.+}-{2:2}

and interrupts could create inverse lock ordering between them.

other info that might help us debug this:
Chain exists of:
&group->lock --> &timer->lock --> tasklist_lock

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(tasklist_lock);
local_irq_disable();
lock(&group->lock);
lock(&timer->lock);
<Interrupt>
lock(&group->lock);

*** DEADLOCK ***

no locks held by swapper/0/0.

the shortest dependencies between 2nd lock and 1st lock:

-> (tasklist_lock){.+.+}-{2:2} {
HARDIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]

lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] kernel/locking/spinlock.c:228
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_sync kernel/umh.c:139 [inline] kernel/umh.c:166
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 arch/x86/entry/entry_64.S:295

SOFTIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]

lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] kernel/locking/spinlock.c:228
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_sync kernel/umh.c:139 [inline] kernel/umh.c:166
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 arch/x86/entry/entry_64.S:295

INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]

lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
__raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline] kernel/locking/spinlock.c:316
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:316 kernel/locking/spinlock.c:316
copy_process+0x36c8/0x75a0 kernel/fork.c:2311 kernel/fork.c:2311
kernel_clone+0xe7/0xab0 kernel/fork.c:2582 kernel/fork.c:2582
kernel_thread+0xb5/0xf0 kernel/fork.c:2634 kernel/fork.c:2634
rest_init+0x23/0x3e0 init/main.c:690 init/main.c:690
start_kernel+0x47a/0x49b init/main.c:1135 init/main.c:1135

secondary_startup_64_no_verify+0xb0/0xbb
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]

lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] kernel/locking/spinlock.c:228
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_sync kernel/umh.c:139 [inline] kernel/umh.c:166
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 arch/x86/entry/entry_64.S:295
}
... key at: [<ffffffff8b80a098>] tasklist_lock+0x18/0x40

... acquired at:
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]

__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] kernel/locking/spinlock.c:228
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 kernel/locking/spinlock.c:228
send_sigio+0xab/0x380 fs/fcntl.c:810 fs/fcntl.c:810

kill_fasync_rcu fs/fcntl.c:1021 [inline]
kill_fasync fs/fcntl.c:1035 [inline]

kill_fasync_rcu fs/fcntl.c:1021 [inline] fs/fcntl.c:1028
kill_fasync fs/fcntl.c:1035 [inline] fs/fcntl.c:1028
kill_fasync+0x1f8/0x470 fs/fcntl.c:1028 fs/fcntl.c:1028
lease_break_callback+0x1f/0x30 fs/locks.c:477 fs/locks.c:477
__break_lease+0x3d7/0x1420 fs/locks.c:1450 fs/locks.c:1450
break_lease include/linux/fs.h:2633 [inline]
break_lease include/linux/fs.h:2623 [inline]
break_lease include/linux/fs.h:2633 [inline] fs/open.c:813
break_lease include/linux/fs.h:2623 [inline] fs/open.c:813
do_dentry_open+0x453/0x1250 fs/open.c:813 fs/open.c:813
do_open fs/namei.c:3426 [inline]
do_open fs/namei.c:3426 [inline] fs/namei.c:3559
path_openat+0x1cad/0x2750 fs/namei.c:3559 fs/namei.c:3559
do_filp_open+0x1aa/0x400 fs/namei.c:3586 fs/namei.c:3586
do_sys_openat2+0x16d/0x4d0 fs/open.c:1212 fs/open.c:1212
do_sys_open fs/open.c:1228 [inline]
__do_sys_creat fs/open.c:1304 [inline]
__se_sys_creat fs/open.c:1298 [inline]
do_sys_open fs/open.c:1228 [inline] fs/open.c:1298
__do_sys_creat fs/open.c:1304 [inline] fs/open.c:1298
__se_sys_creat fs/open.c:1298 [inline] fs/open.c:1298
__x64_sys_creat+0xc9/0x120 fs/open.c:1298 fs/open.c:1298
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80

entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&f->f_owner.lock){....}-{2:2} {
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]

lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
__raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline] kernel/locking/spinlock.c:316
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:316 kernel/locking/spinlock.c:316
f_modown+0x2a/0x390 fs/fcntl.c:91 fs/fcntl.c:91
__f_setown fs/fcntl.c:110 [inline]
f_setown_ex fs/fcntl.c:200 [inline]
__f_setown fs/fcntl.c:110 [inline] fs/fcntl.c:399
f_setown_ex fs/fcntl.c:200 [inline] fs/fcntl.c:399
do_fcntl+0xb24/0x1210 fs/fcntl.c:399 fs/fcntl.c:399

__do_sys_fcntl fs/fcntl.c:472 [inline]
__se_sys_fcntl fs/fcntl.c:457 [inline]

__do_sys_fcntl fs/fcntl.c:472 [inline] fs/fcntl.c:457
__se_sys_fcntl fs/fcntl.c:457 [inline] fs/fcntl.c:457
__x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:457 fs/fcntl.c:457
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80

entry_SYSCALL_64_after_hwframe+0x44/0xae
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]

lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] kernel/locking/spinlock.c:236
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236 kernel/locking/spinlock.c:236
send_sigio+0x24/0x380 fs/fcntl.c:796 fs/fcntl.c:796

kill_fasync_rcu fs/fcntl.c:1021 [inline]
kill_fasync fs/fcntl.c:1035 [inline]

kill_fasync_rcu fs/fcntl.c:1021 [inline] fs/fcntl.c:1028
kill_fasync fs/fcntl.c:1035 [inline] fs/fcntl.c:1028
kill_fasync+0x1f8/0x470 fs/fcntl.c:1028 fs/fcntl.c:1028
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386 sound/core/timer.c:1386
snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516 sound/core/timer.c:516
snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578 sound/core/timer.c:578
snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_start sound/core/timer.c:689 [inline]
snd_timer_start sound/core/timer.c:696 [inline] sound/core/timer.c:1984
snd_timer_start sound/core/timer.c:689 [inline] sound/core/timer.c:1984
snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984 sound/core/timer.c:1984
__snd_timer_user_ioctl.isra.0+0xda8/0x2490 sound/core/timer.c:2107 sound/core/timer.c:2107
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128 sound/core/timer.c:2128

vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]

vfs_ioctl fs/ioctl.c:51 [inline] fs/ioctl.c:860
__do_sys_ioctl fs/ioctl.c:874 [inline] fs/ioctl.c:860
__se_sys_ioctl fs/ioctl.c:860 [inline] fs/ioctl.c:860
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90534da0>] __key.5+0x0/0x40

... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]

__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] kernel/locking/spinlock.c:236
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236 kernel/locking/spinlock.c:236
send_sigio+0x24/0x380 fs/fcntl.c:796 fs/fcntl.c:796

kill_fasync_rcu fs/fcntl.c:1021 [inline]
kill_fasync fs/fcntl.c:1035 [inline]

kill_fasync_rcu fs/fcntl.c:1021 [inline] fs/fcntl.c:1028
kill_fasync fs/fcntl.c:1035 [inline] fs/fcntl.c:1028
kill_fasync+0x1f8/0x470 fs/fcntl.c:1028 fs/fcntl.c:1028
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386 sound/core/timer.c:1386
snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516 sound/core/timer.c:516
snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578 sound/core/timer.c:578
snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_start sound/core/timer.c:689 [inline]
snd_timer_start sound/core/timer.c:696 [inline] sound/core/timer.c:1984
snd_timer_start sound/core/timer.c:689 [inline] sound/core/timer.c:1984
snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984 sound/core/timer.c:1984
__snd_timer_user_ioctl.isra.0+0xda8/0x2490 sound/core/timer.c:2107 sound/core/timer.c:2107
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128 sound/core/timer.c:2128

vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]

vfs_ioctl fs/ioctl.c:51 [inline] fs/ioctl.c:860
__do_sys_ioctl fs/ioctl.c:874 [inline] fs/ioctl.c:860
__se_sys_ioctl fs/ioctl.c:860 [inline] fs/ioctl.c:860
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80

entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&new->fa_lock){....}-{2:2} {

INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]

lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] kernel/locking/spinlock.c:236
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236 kernel/locking/spinlock.c:236

kill_fasync_rcu fs/fcntl.c:1014 [inline]
kill_fasync fs/fcntl.c:1035 [inline]

kill_fasync_rcu fs/fcntl.c:1014 [inline] fs/fcntl.c:1028
kill_fasync fs/fcntl.c:1035 [inline] fs/fcntl.c:1028
kill_fasync+0x136/0x470 fs/fcntl.c:1028 fs/fcntl.c:1028
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386 sound/core/timer.c:1386
snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516 sound/core/timer.c:516
snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578 sound/core/timer.c:578
snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_start sound/core/timer.c:689 [inline]
snd_timer_start sound/core/timer.c:696 [inline] sound/core/timer.c:1984
snd_timer_start sound/core/timer.c:689 [inline] sound/core/timer.c:1984
snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984 sound/core/timer.c:1984
__snd_timer_user_ioctl.isra.0+0xda8/0x2490 sound/core/timer.c:2107 sound/core/timer.c:2107
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128 sound/core/timer.c:2128

vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]

vfs_ioctl fs/ioctl.c:51 [inline] fs/ioctl.c:860
__do_sys_ioctl fs/ioctl.c:874 [inline] fs/ioctl.c:860
__se_sys_ioctl fs/ioctl.c:860 [inline] fs/ioctl.c:860
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90535b80>] __key.0+0x0/0x40

... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]

__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] kernel/locking/spinlock.c:236
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236 kernel/locking/spinlock.c:236

kill_fasync_rcu fs/fcntl.c:1014 [inline]
kill_fasync fs/fcntl.c:1035 [inline]

kill_fasync_rcu fs/fcntl.c:1014 [inline] fs/fcntl.c:1028
kill_fasync fs/fcntl.c:1035 [inline] fs/fcntl.c:1028
kill_fasync+0x136/0x470 fs/fcntl.c:1028 fs/fcntl.c:1028
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386 sound/core/timer.c:1386
snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516 sound/core/timer.c:516
snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578 sound/core/timer.c:578
snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_start sound/core/timer.c:689 [inline]
snd_timer_start sound/core/timer.c:696 [inline] sound/core/timer.c:1984
snd_timer_start sound/core/timer.c:689 [inline] sound/core/timer.c:1984
snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984 sound/core/timer.c:1984
__snd_timer_user_ioctl.isra.0+0xda8/0x2490 sound/core/timer.c:2107 sound/core/timer.c:2107
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128 sound/core/timer.c:2128

vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]

vfs_ioctl fs/ioctl.c:51 [inline] fs/ioctl.c:860
__do_sys_ioctl fs/ioctl.c:874 [inline] fs/ioctl.c:860
__se_sys_ioctl fs/ioctl.c:860 [inline] fs/ioctl.c:860
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&timer->lock){....}-{2:2} {
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]

lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] kernel/locking/spinlock.c:162
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 kernel/locking/spinlock.c:162
snd_timer_resolution+0x55/0x100 sound/core/timer.c:489 sound/core/timer.c:489
snd_timer_user_params.isra.0+0x18e/0x8c0 sound/core/timer.c:1851 sound/core/timer.c:1851
__snd_timer_user_ioctl.isra.0+0x1020/0x2490 sound/core/timer.c:2100 sound/core/timer.c:2100
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128 sound/core/timer.c:2128

vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]

vfs_ioctl fs/ioctl.c:51 [inline] fs/ioctl.c:860
__do_sys_ioctl fs/ioctl.c:874 [inline] fs/ioctl.c:860
__se_sys_ioctl fs/ioctl.c:860 [inline] fs/ioctl.c:860
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90833500>] __key.12+0x0/0x40

... acquired at:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]

__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] kernel/locking/spinlock.c:162
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 kernel/locking/spinlock.c:162
snd_timer_notify sound/core/timer.c:1086 [inline]
snd_timer_notify sound/core/timer.c:1086 [inline] sound/core/timer.c:1073
snd_timer_notify+0x10c/0x3d0 sound/core/timer.c:1073 sound/core/timer.c:1073
snd_pcm_timer_notify sound/core/pcm_native.c:595 [inline]
snd_pcm_timer_notify sound/core/pcm_native.c:595 [inline] sound/core/pcm_native.c:1392
snd_pcm_post_start+0x24a/0x310 sound/core/pcm_native.c:1392 sound/core/pcm_native.c:1392
snd_pcm_action_single sound/core/pcm_native.c:1229 [inline]
snd_pcm_action_single sound/core/pcm_native.c:1229 [inline] sound/core/pcm_native.c:1310
snd_pcm_action+0x143/0x170 sound/core/pcm_native.c:1310 sound/core/pcm_native.c:1310
__snd_pcm_lib_xfer+0x1289/0x1d80 sound/core/pcm_lib.c:2286 sound/core/pcm_lib.c:2286
snd_pcm_oss_write3+0x103/0x250 sound/core/oss/pcm_oss.c:1241 sound/core/oss/pcm_oss.c:1241
io_playback_transfer+0x27e/0x330 sound/core/oss/io.c:47 sound/core/oss/io.c:47
snd_pcm_plug_write_transfer+0x2cd/0x3f0 sound/core/oss/pcm_plugin.c:627 sound/core/oss/pcm_plugin.c:627
snd_pcm_oss_write2+0x245/0x3f0 sound/core/oss/pcm_oss.c:1373 sound/core/oss/pcm_oss.c:1373
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1439 [inline]
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1439 [inline] sound/core/oss/pcm_oss.c:2805
snd_pcm_oss_write+0x75f/0x9c0 sound/core/oss/pcm_oss.c:2805 sound/core/oss/pcm_oss.c:2805
vfs_write+0x28e/0xae0 fs/read_write.c:588 fs/read_write.c:588
ksys_write+0x12d/0x250 fs/read_write.c:643 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&group->lock){..-.}-{2:2} {
IN-SOFTIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]

lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] kernel/locking/spinlock.c:162
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 kernel/locking/spinlock.c:162
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170 sound/core/pcm_native.c:170
snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848 sound/core/pcm_lib.c:1848
dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__run_hrtimer kernel/time/hrtimer.c:1685 [inline] kernel/time/hrtimer.c:1749
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766 kernel/time/hrtimer.c:1766
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
invoke_softirq kernel/softirq.c:432 [inline] kernel/softirq.c:637
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 arch/x86/include/asm/idtentry.h:638
native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline]
native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] drivers/acpi/processor_idle.c:553
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] drivers/acpi/processor_idle.c:553
acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline] drivers/acpi/processor_idle.c:553
acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:553 drivers/acpi/processor_idle.c:553
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:688 drivers/acpi/processor_idle.c:688
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:158 [inline]
cpuidle_idle_call kernel/sched/idle.c:239 [inline]
call_cpuidle kernel/sched/idle.c:158 [inline] kernel/sched/idle.c:306
cpuidle_idle_call kernel/sched/idle.c:239 [inline] kernel/sched/idle.c:306
do_idle+0x3e8/0x590 kernel/sched/idle.c:306 kernel/sched/idle.c:306
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 kernel/sched/idle.c:403
start_kernel+0x47a/0x49b init/main.c:1135 init/main.c:1135
secondary_startup_64_no_verify+0xb0/0xbb

INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]

lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] kernel/locking/spinlock.c:170
_raw_spin_lock_irq+0x32/0x50 kernel/locking/spinlock.c:170 kernel/locking/spinlock.c:170

spin_lock_irq include/linux/spinlock.h:374 [inline]
snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline]
snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline]

spin_lock_irq include/linux/spinlock.h:374 [inline] sound/core/pcm_native.c:686
snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline] sound/core/pcm_native.c:686
snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline] sound/core/pcm_native.c:686
snd_pcm_hw_params+0x12a/0x1990 sound/core/pcm_native.c:686 sound/core/pcm_native.c:686
snd_pcm_kernel_ioctl+0x164/0x310 sound/core/pcm_native.c:3372 sound/core/pcm_native.c:3372
snd_pcm_oss_change_params_locked+0x13c8/0x3bf0 sound/core/oss/pcm_oss.c:960 sound/core/oss/pcm_oss.c:960
snd_pcm_oss_make_ready_locked+0xb3/0x130 sound/core/oss/pcm_oss.c:1186 sound/core/oss/pcm_oss.c:1186
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1404 [inline]
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1404 [inline] sound/core/oss/pcm_oss.c:2805
snd_pcm_oss_write+0x4b2/0x9c0 sound/core/oss/pcm_oss.c:2805 sound/core/oss/pcm_oss.c:2805
vfs_write+0x28e/0xae0 fs/read_write.c:588 fs/read_write.c:588
ksys_write+0x12d/0x250 fs/read_write.c:643 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90833d60>] __key.9+0x0/0x40
... acquired at:
mark_usage kernel/locking/lockdep.c:4500 [inline]
mark_usage kernel/locking/lockdep.c:4500 [inline] kernel/locking/lockdep.c:4981
__lock_acquire+0x11d5/0x54a0 kernel/locking/lockdep.c:4981 kernel/locking/lockdep.c:4981
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] kernel/locking/spinlock.c:162
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 kernel/locking/spinlock.c:162
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170 sound/core/pcm_native.c:170
snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848 sound/core/pcm_lib.c:1848
dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__run_hrtimer kernel/time/hrtimer.c:1685 [inline] kernel/time/hrtimer.c:1749
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766 kernel/time/hrtimer.c:1766
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
invoke_softirq kernel/softirq.c:432 [inline] kernel/softirq.c:637
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 arch/x86/include/asm/idtentry.h:638
native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline]
native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] drivers/acpi/processor_idle.c:553
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] drivers/acpi/processor_idle.c:553
acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline] drivers/acpi/processor_idle.c:553
acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:553 drivers/acpi/processor_idle.c:553
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:688 drivers/acpi/processor_idle.c:688
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:158 [inline]
cpuidle_idle_call kernel/sched/idle.c:239 [inline]
call_cpuidle kernel/sched/idle.c:158 [inline] kernel/sched/idle.c:306
cpuidle_idle_call kernel/sched/idle.c:239 [inline] kernel/sched/idle.c:306
do_idle+0x3e8/0x590 kernel/sched/idle.c:306 kernel/sched/idle.c:306
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 kernel/sched/idle.c:403
start_kernel+0x47a/0x49b init/main.c:1135 init/main.c:1135
secondary_startup_64_no_verify+0xb0/0xbb


stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.16.0-rc5-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
__dump_stack lib/dump_stack.c:88 [inline] lib/dump_stack.c:106
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 lib/dump_stack.c:106
print_irq_inversion_bug kernel/locking/lockdep.c:203 [inline]
check_usage_forwards kernel/locking/lockdep.c:4043 [inline]
mark_lock_irq kernel/locking/lockdep.c:4175 [inline]
print_irq_inversion_bug kernel/locking/lockdep.c:203 [inline] kernel/locking/lockdep.c:4605
check_usage_forwards kernel/locking/lockdep.c:4043 [inline] kernel/locking/lockdep.c:4605
mark_lock_irq kernel/locking/lockdep.c:4175 [inline] kernel/locking/lockdep.c:4605
mark_lock.cold+0x86/0x8e kernel/locking/lockdep.c:4605 kernel/locking/lockdep.c:4605
mark_usage kernel/locking/lockdep.c:4500 [inline]
mark_usage kernel/locking/lockdep.c:4500 [inline] kernel/locking/lockdep.c:4981
__lock_acquire+0x11d5/0x54a0 kernel/locking/lockdep.c:4981 kernel/locking/lockdep.c:4981
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] kernel/locking/spinlock.c:162
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 kernel/locking/spinlock.c:162
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170 sound/core/pcm_native.c:170
snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848 sound/core/pcm_lib.c:1848
dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__run_hrtimer kernel/time/hrtimer.c:1685 [inline] kernel/time/hrtimer.c:1749
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766 kernel/time/hrtimer.c:1766
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
invoke_softirq kernel/softirq.c:432 [inline] kernel/softirq.c:637
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 arch/x86/kernel/apic/apic.c:1097
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 arch/x86/include/asm/idtentry.h:638
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] drivers/acpi/processor_idle.c:553
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] drivers/acpi/processor_idle.c:553
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline] drivers/acpi/processor_idle.c:553
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline] drivers/acpi/processor_idle.c:553
RIP: 0010:acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:553 drivers/acpi/processor_idle.c:553
Code: 89 de e8 6d 5e 30 f8 84 db 75 ac e8 84 5a 30 f8 e8 cf 9e 36 f8 eb 0c e8 78 5a 30 f8 0f 00 2d d1 b4 c9 00 e8 6c 5a 30 f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 e7 5c 30 f8 48 85 db
RSP: 0018:ffffffff8b807d60 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff8b8bc6c0 RSI: ffffffff89475854 RDI: 0000000000000000
RBP: ffff888011a74864 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817df748 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888011a74800 R14: ffff888011a74864 R15: ffff888145d9c804
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:688 drivers/acpi/processor_idle.c:688
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:158 [inline]
cpuidle_idle_call kernel/sched/idle.c:239 [inline]
call_cpuidle kernel/sched/idle.c:158 [inline] kernel/sched/idle.c:306
cpuidle_idle_call kernel/sched/idle.c:239 [inline] kernel/sched/idle.c:306
do_idle+0x3e8/0x590 kernel/sched/idle.c:306 kernel/sched/idle.c:306
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 kernel/sched/idle.c:403
start_kernel+0x47a/0x49b init/main.c:1135 init/main.c:1135
secondary_startup_64_no_verify+0xb0/0xbb
</TASK>
----------------
Code disassembly (best guess):
0: 89 de mov %ebx,%esi
2: e8 6d 5e 30 f8 callq 0xf8305e74
7: 84 db test %bl,%bl
9: 75 ac jne 0xffffffb7
b: e8 84 5a 30 f8 callq 0xf8305a94
10: e8 cf 9e 36 f8 callq 0xf8369ee4
15: eb 0c jmp 0x23
17: e8 78 5a 30 f8 callq 0xf8305a94
1c: 0f 00 2d d1 b4 c9 00 verw 0xc9b4d1(%rip) # 0xc9b4f4
23: e8 6c 5a 30 f8 callq 0xf8305a94
28: fb sti
29: f4 hlt
* 2a: 9c pushfq <-- trapping instruction
2b: 5b pop %rbx
2c: 81 e3 00 02 00 00 and $0x200,%ebx
32: fa cli
33: 31 ff xor %edi,%edi
35: 48 89 de mov %rbx,%rsi
38: e8 e7 5c 30 f8 callq 0xf8305d24
3d: 48 85 db test %rbx,%rbx
----------------
Code disassembly (best guess):
0: 89 de mov %ebx,%esi
2: e8 6d 5e 30 f8 callq 0xf8305e74
7: 84 db test %bl,%bl
9: 75 ac jne 0xffffffb7
b: e8 84 5a 30 f8 callq 0xf8305a94
10: e8 cf 9e 36 f8 callq 0xf8369ee4
15: eb 0c jmp 0x23
17: e8 78 5a 30 f8 callq 0xf8305a94
1c: 0f 00 2d d1 b4 c9 00 verw 0xc9b4d1(%rip) # 0xc9b4f4
23: e8 6c 5a 30 f8 callq 0xf8305a94
28: fb sti
29: f4 hlt
* 2a: 9c pushfq <-- trapping instruction
2b: 5b pop %rbx
2c: 81 e3 00 02 00 00 and $0x200,%ebx
32: fa cli
33: 31 ff xor %edi,%edi
35: 48 89 de mov %rbx,%rsi
38: e8 e7 5c 30 f8 callq 0xf8305d24
3d: 48 85 db test %rbx,%rbx

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 13bc32bad705 Merge tag 'drm-fixes-2022-04-23' of git://ano..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11371798f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=71bf5c8488a4e33a

dashboard link: https://syzkaller.appspot.com/bug?extid=58740f570d9b0dacf2a3
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=129b3992f00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17a6b6fcf00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+58740f...@syzkaller.appspotmail.com

========================================================
WARNING: possible irq lock inversion dependency detected

5.18.0-rc3-syzkaller-00218-g13bc32bad705 #0 Not tainted

--------------------------------------------------------
swapper/0/0 just changed the state of lock:

ffff888022e8b110 (&group->lock){..-.}-{2:2}, at: _snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170

but this lock took another, SOFTIRQ-READ-unsafe lock in the past:

(tasklist_lock){.+.+}-{2:2}

and interrupts could create inverse lock ordering between them.

other info that might help us debug this:
Chain exists of:
&group->lock --> &timer->lock --> tasklist_lock

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(tasklist_lock);
local_irq_disable();
lock(&group->lock);
lock(&timer->lock);
<Interrupt>
lock(&group->lock);

*** DEADLOCK ***

no locks held by swapper/0/0.

the shortest dependencies between 2nd lock and 1st lock:

-> (tasklist_lock){.+.+}-{2:2} {
HARDIRQ-ON-R at:

lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1508
kernel_wait+0x9c/0x150 kernel/exit.c:1698

call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166

process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
SOFTIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1508
kernel_wait+0x9c/0x150 kernel/exit.c:1698

call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166

process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:326
copy_process+0x4364/0x6fe0 kernel/fork.c:2368
kernel_clone+0xe7/0xab0 kernel/fork.c:2639
kernel_thread+0xb5/0xf0 kernel/fork.c:2691
rest_init+0x23/0x3e0 init/main.c:691
start_kernel+0x47f/0x4a0 init/main.c:1140
secondary_startup_64_no_verify+0xc3/0xcb
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1508
kernel_wait+0x9c/0x150 kernel/exit.c:1698

call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166

process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
}
... key at: [<ffffffff8ba0a098>] tasklist_lock+0x18/0x40
... acquired at:
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
send_sigio+0xab/0x380 fs/fcntl.c:792
dnotify_handle_event+0x148/0x280 fs/notify/dnotify/dnotify.c:115
fsnotify_handle_inode_event.isra.0+0x209/0x350 fs/notify/fsnotify.c:264
fsnotify_handle_event fs/notify/fsnotify.c:323 [inline]
send_to_group fs/notify/fsnotify.c:377 [inline]
fsnotify+0xeaf/0x13d0 fs/notify/fsnotify.c:564
fsnotify_name include/linux/fsnotify.h:36 [inline]
fsnotify_name include/linux/fsnotify.h:29 [inline]
fsnotify_dirent include/linux/fsnotify.h:42 [inline]
fsnotify_create include/linux/fsnotify.h:207 [inline]
open_last_lookups fs/namei.c:3402 [inline]
path_openat+0x1232/0x2910 fs/namei.c:3606
do_filp_open+0x1aa/0x400 fs/namei.c:3636
do_sys_openat2+0x16d/0x4c0 fs/open.c:1213
do_sys_open fs/open.c:1229 [inline]
__do_sys_creat fs/open.c:1305 [inline]
__se_sys_creat fs/open.c:1299 [inline]
__x64_sys_creat+0xc9/0x120 fs/open.c:1299

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&f->f_owner.lock){....}-{2:2} {
INITIAL USE at:

lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:326

f_modown+0x2a/0x390 fs/fcntl.c:91
__f_setown fs/fcntl.c:110 [inline]
f_setown+0xd7/0x230 fs/fcntl.c:138

do_fcntl+0x748/0x10b0 fs/fcntl.c:377
__do_sys_fcntl fs/fcntl.c:454 [inline]
__se_sys_fcntl fs/fcntl.c:439 [inline]
__x64_sys_fcntl+0x15f/0x1d0 fs/fcntl.c:439

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
INITIAL READ USE at:

lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
send_sigio+0x24/0x380 fs/fcntl.c:778
kill_fasync_rcu fs/fcntl.c:1003 [inline]
kill_fasync fs/fcntl.c:1017 [inline]
kill_fasync+0x1f8/0x470 fs/fcntl.c:1010
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386

snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516
snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578

snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_start sound/core/timer.c:689 [inline]

snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984
__snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}

... key at: [<ffffffff9061aa40>] __key.5+0x0/0x40
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
send_sigio+0x24/0x380 fs/fcntl.c:778
kill_fasync_rcu fs/fcntl.c:1003 [inline]
kill_fasync fs/fcntl.c:1017 [inline]
kill_fasync+0x1f8/0x470 fs/fcntl.c:1010
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386

snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516
snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578

snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_start sound/core/timer.c:689 [inline]

snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984
__snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&new->fa_lock){....}-{2:2} {

INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:996 [inline]
kill_fasync fs/fcntl.c:1017 [inline]
kill_fasync+0x136/0x470 fs/fcntl.c:1010
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386

snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516
snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578

snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_start sound/core/timer.c:689 [inline]

snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984
__snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}

... key at: [<ffffffff9061b820>] __key.0+0x0/0x40
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:996 [inline]
kill_fasync fs/fcntl.c:1017 [inline]
kill_fasync+0x136/0x470 fs/fcntl.c:1010
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386

snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516
snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578

snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_start sound/core/timer.c:689 [inline]

snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984
__snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&timer->lock){....}-{2:2} {
INITIAL USE at:

lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606

__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162

snd_timer_resolution+0x55/0x100 sound/core/timer.c:489
snd_timer_user_params.isra.0+0x18e/0x8c0 sound/core/timer.c:1851
__snd_timer_user_ioctl.isra.0+0x101c/0x2490 sound/core/timer.c:2100
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}

... key at: [<ffffffff909196a0>] __key.10+0x0/0x40

... acquired at:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162

snd_timer_notify sound/core/timer.c:1086 [inline]
snd_timer_notify+0x10c/0x3d0 sound/core/timer.c:1073
snd_pcm_timer_notify sound/core/pcm_native.c:608 [inline]
snd_pcm_post_start+0x24a/0x310 sound/core/pcm_native.c:1451
snd_pcm_action_single+0xf4/0x130 sound/core/pcm_native.c:1283
snd_pcm_action+0x6e/0x90 sound/core/pcm_native.c:1364
__snd_pcm_lib_xfer+0x14d0/0x1e10 sound/core/pcm_lib.c:2308
snd_pcm_oss_write3+0x103/0x250 sound/core/oss/pcm_oss.c:1253
snd_pcm_oss_write2+0x30e/0x3f0 sound/core/oss/pcm_oss.c:1393
snd_pcm_oss_sync1+0x187/0x440 sound/core/oss/pcm_oss.c:1627
snd_pcm_oss_sync+0x638/0x800 sound/core/oss/pcm_oss.c:1704
snd_pcm_oss_release+0x276/0x300 sound/core/oss/pcm_oss.c:2590
__fput+0x277/0x9d0 fs/file_table.c:317
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
exit_task_work include/linux/task_work.h:37 [inline]
do_exit+0xaff/0x2a00 kernel/exit.c:795
do_group_exit+0xd2/0x2f0 kernel/exit.c:925
__do_sys_exit_group kernel/exit.c:936 [inline]
__se_sys_exit_group kernel/exit.c:934 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&group->lock){..-.}-{2:2} {
IN-SOFTIRQ-W at:

lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606

__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170
snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848

dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766

__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]

__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645

native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]

acpi_safe_halt drivers/acpi/processor_idle.c:115 [inline]
acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:556
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:691
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3e8/0x590 kernel/sched/idle.c:303
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
start_kernel+0x47f/0x4a0 init/main.c:1140
secondary_startup_64_no_verify+0xc3/0xcb
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606

__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x32/0x50 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:374 [inline]
snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline]
snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline]

snd_pcm_hw_params+0x14b/0x19f0 sound/core/pcm_native.c:726
snd_pcm_kernel_ioctl+0x164/0x310 sound/core/pcm_native.c:3435
snd_pcm_oss_change_params_locked+0x14e2/0x3a70 sound/core/oss/pcm_oss.c:976
snd_pcm_oss_make_ready_locked+0xb3/0x130 sound/core/oss/pcm_oss.c:1198
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1416 [inline]
snd_pcm_oss_write+0x4ac/0x9c0 sound/core/oss/pcm_oss.c:2811
vfs_write+0x269/0xac0 fs/read_write.c:589
ksys_write+0x127/0x250 fs/read_write.c:644

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}

... key at: [<ffffffff90919f00>] __key.8+0x0/0x40
... acquired at:
mark_lock kernel/locking/lockdep.c:4571 [inline]
mark_usage kernel/locking/lockdep.c:4502 [inline]
__lock_acquire+0x11e7/0x56c0 kernel/locking/lockdep.c:4983
lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606

__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170
snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848

dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766

__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]

__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645

native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]

acpi_safe_halt drivers/acpi/processor_idle.c:115 [inline]
acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:556
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:691
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3e8/0x590 kernel/sched/idle.c:303
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
start_kernel+0x47f/0x4a0 init/main.c:1140
secondary_startup_64_no_verify+0xc3/0xcb


stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.18.0-rc3-syzkaller-00218-g13bc32bad705 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

<IRQ>

__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106

print_irq_inversion_bug kernel/locking/lockdep.c:192 [inline]
check_usage_forwards kernel/locking/lockdep.c:4045 [inline]
mark_lock_irq kernel/locking/lockdep.c:4177 [inline]
mark_lock.part.0.cold+0x86/0xd8 kernel/locking/lockdep.c:4607
mark_lock kernel/locking/lockdep.c:4571 [inline]
mark_usage kernel/locking/lockdep.c:4502 [inline]
__lock_acquire+0x11e7/0x56c0 kernel/locking/lockdep.c:4983
lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606

__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170
snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848

dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766

__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]

__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645

RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]

RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:116 [inline]
RIP: 0010:acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:556
Code: 89 de e8 7d 6e 0c f8 84 db 75 ac e8 94 6a 0c f8 e8 ff b2 12 f8 eb 0c e8 88 6a 0c f8 0f 00 2d 51 07 c6 00 e8 7c 6a 0c f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 f7 6c 0c f8 48 85 db
RSP: 0018:ffffffff8ba07d60 EFLAGS: 00000293

RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000

RDX: ffffffff8babc700 RSI: ffffffff896cc614 RDI: 0000000000000000
RBP: ffff8880165b4864 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817f7938 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8880165b4800 R14: ffff8880165b4864 R15: ffff8881407ed004
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:691
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3e8/0x590 kernel/sched/idle.c:303
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
start_kernel+0x47f/0x4a0 init/main.c:1140
second

----------------
Code disassembly (best guess):
0: 89 de mov %ebx,%esi

2: e8 7d 6e 0c f8 callq 0xf80c6e84

7: 84 db test %bl,%bl
9: 75 ac jne 0xffffffb7

b: e8 94 6a 0c f8 callq 0xf80c6aa4
10: e8 ff b2 12 f8 callq 0xf812b314

15: eb 0c jmp 0x23

17: e8 88 6a 0c f8 callq 0xf80c6aa4
1c: 0f 00 2d 51 07 c6 00 verw 0xc60751(%rip) # 0xc60774
23: e8 7c 6a 0c f8 callq 0xf80c6aa4

28: fb sti
29: f4 hlt
* 2a: 9c pushfq <-- trapping instruction
2b: 5b pop %rbx
2c: 81 e3 00 02 00 00 and $0x200,%ebx
32: fa cli
33: 31 ff xor %edi,%edi
35: 48 89 de mov %rbx,%rsi

38: e8 f7 6c 0c f8 callq 0xf80c6d34

[Hillf Danton]

On Sat, 23 Apr 2022 15:52:24 -0700

To fix the deadlock, walk task list under rcu instead of tasklist_lock.

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ 13bc32bad705

--- y/fs/fcntl.c
+++ x/fs/fcntl.c
@@ -789,11 +789,11 @@ void send_sigio(struct fown_struct *fown
send_sigio_to_task(p, fown, fd, band, type);
rcu_read_unlock();
} else {
- read_lock(&tasklist_lock);
+ rcu_read_lock();
do_each_pid_task(pid, type, p) {
send_sigio_to_task(p, fown, fd, band, type);
} while_each_pid_task(pid, type, p);
- read_unlock(&tasklist_lock);
+ rcu_read_unlock();
}
out_unlock_fown:
read_unlock_irqrestore(&fown->lock, flags);
--

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+58740f...@syzkaller.appspotmail.com

Tested on:

commit: 13bc32ba Merge tag 'drm-fixes-2022-04-23' of git://ano..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/

kernel config: https://syzkaller.appspot.com/x/.config?x=71bf5c8488a4e33a
dashboard link: https://syzkaller.appspot.com/bug?extid=58740f570d9b0dacf2a3
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

patch: https://syzkaller.appspot.com/x/patch.diff?x=17585ddcf00000

Note: testing is done by a robot and is best-effort only.

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.