[v6.6] possible deadlock in evdev_pass_values (2)
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syzbot
Mar 12, 2026, 9:02:36 AM (18 hours ago) Mar 12
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 4fc00fe35d46 Linux 6.6.129
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12b984d6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5b35c4db8465904
dashboard link: https://syzkaller.appspot.com/bug?extid=952c5c5b06a51177537b
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b69a43016252/disk-4fc00fe3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/240ac8d2cf70/vmlinux-4fc00fe3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/67c7958e5edb/bzImage-4fc00fe3.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+952c5c...@syzkaller.appspotmail.com
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Not tainted
-----------------------------------------------------
syz.0.6650/24772 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8ce0a058 (tasklist_lock){.+.+}-{2:2}, at: send_sigurg+0xf0/0x3c0 fs/fcntl.c:827
and this task is already holding:
ffff88805a206b18 (&f->f_owner.lock){....}-{2:2}, at: send_sigurg+0x29/0x3c0 fs/fcntl.c:811
which would create a new lock dependency:
(&f->f_owner.lock){....}-{2:2} -> (tasklist_lock){.+.+}-{2:2}
but this new dependency connects a SOFTIRQ-irq-safe lock:
(&client->buffer_lock){..-.}-{2:2}
... which became SOFTIRQ-irq-safe at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
input_event+0x8c/0xc0 drivers/input/input.c:435
input_sync include/linux/input.h:450 [inline]
hidinput_report_event+0xa1/0xf0 drivers/hid/hid-input.c:1750
hid_report_raw_event+0x151d/0x1750 drivers/hid/hid-core.c:2038
hid_input_report+0x434/0x510 drivers/hid/hid-core.c:2105
hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284
__usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
dummy_timer+0xc04/0x3080 drivers/usb/gadget/udc/dummy_hcd.c:1993
__run_hrtimer kernel/time/hrtimer.c:1750 [inline]
__hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1814
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1831
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758
fs_reclaim_acquire+0x98/0x100 mm/page_alloc.c:3616
might_alloc include/linux/sched/mm.h:303 [inline]
slab_pre_alloc_hook+0x2a/0x310 mm/slab.h:714
slab_alloc_node mm/slub.c:3477 [inline]
__kmem_cache_alloc_node+0x53/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0xa4/0x230 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
kobject_get_path+0xc3/0x2c0 lib/kobject.c:161
kobject_uevent_env+0x28a/0x8b0 lib/kobject_uevent.c:544
really_probe+0x715/0xb20 drivers/base/dd.c:708
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
hid_add_device+0x38d/0x530 drivers/hid/hid-core.c:2832
usbhid_probe+0xe02/0x1220 drivers/hid/usbhid/hid-core.c:1447
usb_probe_interface+0x5c9/0xb20 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2207
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x13d/0x270 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
usb_new_device+0xa3c/0x1660 drivers/usb/core/hub.c:2660
hub_port_connect drivers/usb/core/hub.c:5529 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5669 [inline]
port_event drivers/usb/core/hub.c:5833 [inline]
hub_event+0x29bf/0x49f0 drivers/usb/core/hub.c:5915
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
to a SOFTIRQ-irq-unsafe lock:
(tasklist_lock){.+.+}-{2:2}
... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
other info that might help us debug this:
Chain exists of:
&client->buffer_lock --> &f->f_owner.lock --> tasklist_lock
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(tasklist_lock);
local_irq_disable();
lock(&client->buffer_lock);
lock(&f->f_owner.lock);
<Interrupt>
lock(&client->buffer_lock);
*** DEADLOCK ***
2 locks held by syz.0.6650/24772:
#0: ffff88807bbe7e80 (&u->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#0: ffff88807bbe7e80 (&u->lock){+.+.}-{2:2}, at: queue_oob+0x1e2/0x4f0 net/unix/af_unix.c:2190
#1: ffff88805a206b18 (&f->f_owner.lock){....}-{2:2}, at: send_sigurg+0x29/0x3c0 fs/fcntl.c:811
the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&client->buffer_lock){..-.}-{2:2} {
IN-SOFTIRQ-W at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
input_event+0x8c/0xc0 drivers/input/input.c:435
input_sync include/linux/input.h:450 [inline]
hidinput_report_event+0xa1/0xf0 drivers/hid/hid-input.c:1750
hid_report_raw_event+0x151d/0x1750 drivers/hid/hid-core.c:2038
hid_input_report+0x434/0x510 drivers/hid/hid-core.c:2105
hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284
__usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
dummy_timer+0xc04/0x3080 drivers/usb/gadget/udc/dummy_hcd.c:1993
__run_hrtimer kernel/time/hrtimer.c:1750 [inline]
__hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1814
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1831
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758
fs_reclaim_acquire+0x98/0x100 mm/page_alloc.c:3616
might_alloc include/linux/sched/mm.h:303 [inline]
slab_pre_alloc_hook+0x2a/0x310 mm/slab.h:714
slab_alloc_node mm/slub.c:3477 [inline]
__kmem_cache_alloc_node+0x53/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0xa4/0x230 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
kobject_get_path+0xc3/0x2c0 lib/kobject.c:161
kobject_uevent_env+0x28a/0x8b0 lib/kobject_uevent.c:544
really_probe+0x715/0xb20 drivers/base/dd.c:708
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
hid_add_device+0x38d/0x530 drivers/hid/hid-core.c:2832
usbhid_probe+0xe02/0x1220 drivers/hid/usbhid/hid-core.c:1447
usb_probe_interface+0x5c9/0xb20 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2207
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x13d/0x270 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
usb_new_device+0xa3c/0x1660 drivers/usb/core/hub.c:2660
hub_port_connect drivers/usb/core/hub.c:5529 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5669 [inline]
port_event drivers/usb/core/hub.c:5833 [inline]
hub_event+0x29bf/0x49f0 drivers/usb/core/hub.c:5915
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
input_inject_event+0x1f9/0x320 drivers/input/input.c:465
evdev_write+0x35f/0x490 drivers/input/evdev.c:530
vfs_write+0x296/0x990 fs/read_write.c:582
ksys_write+0x150/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
}
... key at: [<ffffffff9762cd20>] evdev_open.__key.28+0x0/0x20
-> (&new->fa_lock){....}-{2:2} {
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326
fasync_remove_entry+0xf4/0x1c0 fs/fcntl.c:867
sock_fasync+0x88/0xf0 net/socket.c:1445
__fput+0x7f3/0x970 fs/file_table.c:381
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
INITIAL READ USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:990 [inline]
kill_fasync+0x192/0x4b0 fs/fcntl.c:1011
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async+0x17f/0x280 include/net/sock.h:2615
mptcp_destroy_common+0x113/0x4c0 net/mptcp/protocol.c:3488
mptcp_disconnect+0x204/0x520 net/mptcp/protocol.c:3297
inet_shutdown+0x1be/0x370 net/ipv4/af_inet.c:934
__sys_shutdown_sock net/socket.c:2435 [inline]
__sys_shutdown net/socket.c:2447 [inline]
__do_sys_shutdown net/socket.c:2455 [inline]
__se_sys_shutdown net/socket.c:2453 [inline]
__x64_sys_shutdown+0x174/0x1d0 net/socket.c:2453
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
}
... key at: [<ffffffff97333b20>] fasync_insert_entry.__key+0x0/0x20
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:990 [inline]
kill_fasync+0x192/0x4b0 fs/fcntl.c:1011
__pass_event drivers/input/evdev.c:240 [inline]
evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
input_inject_event+0x1f9/0x320 drivers/input/input.c:465
evdev_write+0x35f/0x490 drivers/input/evdev.c:530
vfs_write+0x296/0x990 fs/read_write.c:582
ksys_write+0x150/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> (&f->f_owner.lock){....}-{2:2} {
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326
__f_setown+0x3b/0x330 fs/fcntl.c:92
fcntl_dirnotify+0x6e2/0x8d0 fs/notify/dnotify/dnotify.c:369
do_fcntl+0x390/0x1490 fs/fcntl.c:400
__do_sys_fcntl fs/fcntl.c:448 [inline]
__se_sys_fcntl+0xc9/0x1a0 fs/fcntl.c:433
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
INITIAL READ USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
send_sigio+0x33/0x360 fs/fcntl.c:772
kill_fasync_rcu fs/fcntl.c:997 [inline]
kill_fasync+0x228/0x4b0 fs/fcntl.c:1011
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async+0x17f/0x280 include/net/sock.h:2615
mptcp_destroy_common+0x113/0x4c0 net/mptcp/protocol.c:3488
mptcp_disconnect+0x204/0x520 net/mptcp/protocol.c:3297
inet_shutdown+0x1be/0x370 net/ipv4/af_inet.c:934
__sys_shutdown_sock net/socket.c:2435 [inline]
__sys_shutdown net/socket.c:2447 [inline]
__do_sys_shutdown net/socket.c:2455 [inline]
__se_sys_shutdown net/socket.c:2453 [inline]
__x64_sys_shutdown+0x174/0x1d0 net/socket.c:2453
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
}
... key at: [<ffffffff97332ea0>] init_file.__key+0x0/0x20
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
send_sigio+0x33/0x360 fs/fcntl.c:772
kill_fasync_rcu fs/fcntl.c:997 [inline]
kill_fasync+0x228/0x4b0 fs/fcntl.c:1011
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async+0x17f/0x280 include/net/sock.h:2615
mptcp_destroy_common+0x113/0x4c0 net/mptcp/protocol.c:3488
mptcp_disconnect+0x204/0x520 net/mptcp/protocol.c:3297
inet_shutdown+0x1be/0x370 net/ipv4/af_inet.c:934
__sys_shutdown_sock net/socket.c:2435 [inline]
__sys_shutdown net/socket.c:2447 [inline]
__do_sys_shutdown net/socket.c:2455 [inline]
__se_sys_shutdown net/socket.c:2453 [inline]
__x64_sys_shutdown+0x174/0x1d0 net/socket.c:2453
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{2:2} {
HARDIRQ-ON-R at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
SOFTIRQ-ON-R at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326
copy_process+0x2275/0x3d80 kernel/fork.c:2631
kernel_clone+0x24b/0x8a0 kernel/fork.c:2914
user_mode_thread+0x111/0x180 kernel/fork.c:2992
rest_init+0x27/0x300 init/main.c:709
arch_call_rest_init+0xe/0x10 init/main.c:841
start_kernel+0x459/0x4e0 init/main.c:1086
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
copy_bootdata+0x0/0xe0 arch/x86/kernel/head64.c:536
secondary_startup_64_no_verify+0x179/0x17b
INITIAL READ USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
}
... key at: [<ffffffff8ce0a058>] tasklist_lock+0x18/0x40
... acquired at:
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
send_sigurg+0xf0/0x3c0 fs/fcntl.c:827
sk_send_sigurg+0x6f/0xc0 net/core/sock.c:3412
queue_oob+0x3f1/0x4f0 net/unix/af_unix.c:2207
unix_stream_sendmsg+0xaf0/0xbf0 net/unix/af_unix.c:2326
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5ba/0x960 net/socket.c:2594
___sys_sendmsg+0x2a6/0x360 net/socket.c:2648
__sys_sendmmsg+0x2ca/0x510 net/socket.c:2734
__do_sys_sendmmsg net/socket.c:2763 [inline]
__se_sys_sendmmsg net/socket.c:2760 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2760
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
stack backtrace:
CPU: 0 PID: 24772 Comm: syz.0.6650 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_bad_irq_dependency kernel/locking/lockdep.c:2626 [inline]
check_irq_usage kernel/locking/lockdep.c:2865 [inline]
check_prev_add kernel/locking/lockdep.c:3138 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x6851/0x7d40 kernel/locking/lockdep.c:5137
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
send_sigurg+0xf0/0x3c0 fs/fcntl.c:827
sk_send_sigurg+0x6f/0xc0 net/core/sock.c:3412
queue_oob+0x3f1/0x4f0 net/unix/af_unix.c:2207
unix_stream_sendmsg+0xaf0/0xbf0 net/unix/af_unix.c:2326
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5ba/0x960 net/socket.c:2594
___sys_sendmsg+0x2a6/0x360 net/socket.c:2648
__sys_sendmmsg+0x2ca/0x510 net/socket.c:2734
__do_sys_sendmmsg net/socket.c:2763 [inline]
__se_sys_sendmmsg net/socket.c:2760 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2760
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0c21d9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0c22ccf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f0c22015fa0 RCX: 00007f0c21d9c799
RDX: 0000000000000001 RSI: 0000200000011500 RDI: 0000000000000003
RBP: 00007f0c21e32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000040015 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0c22016038 R14: 00007f0c22015fa0 R15: 00007ffcff77a058
</TASK>
---
This report is generated by a bot. It may contain errors.
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#syz undup
syzbot found the following issue on:
HEAD commit: 4fc00fe35d46 Linux 6.6.129
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12b984d6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5b35c4db8465904
dashboard link: https://syzkaller.appspot.com/bug?extid=952c5c5b06a51177537b
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b69a43016252/disk-4fc00fe3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/240ac8d2cf70/vmlinux-4fc00fe3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/67c7958e5edb/bzImage-4fc00fe3.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+952c5c...@syzkaller.appspotmail.com
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Not tainted
-----------------------------------------------------
syz.0.6650/24772 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8ce0a058 (tasklist_lock){.+.+}-{2:2}, at: send_sigurg+0xf0/0x3c0 fs/fcntl.c:827
and this task is already holding:
ffff88805a206b18 (&f->f_owner.lock){....}-{2:2}, at: send_sigurg+0x29/0x3c0 fs/fcntl.c:811
which would create a new lock dependency:
(&f->f_owner.lock){....}-{2:2} -> (tasklist_lock){.+.+}-{2:2}
but this new dependency connects a SOFTIRQ-irq-safe lock:
(&client->buffer_lock){..-.}-{2:2}
... which became SOFTIRQ-irq-safe at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
input_event+0x8c/0xc0 drivers/input/input.c:435
input_sync include/linux/input.h:450 [inline]
hidinput_report_event+0xa1/0xf0 drivers/hid/hid-input.c:1750
hid_report_raw_event+0x151d/0x1750 drivers/hid/hid-core.c:2038
hid_input_report+0x434/0x510 drivers/hid/hid-core.c:2105
hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284
__usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
dummy_timer+0xc04/0x3080 drivers/usb/gadget/udc/dummy_hcd.c:1993
__run_hrtimer kernel/time/hrtimer.c:1750 [inline]
__hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1814
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1831
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758
fs_reclaim_acquire+0x98/0x100 mm/page_alloc.c:3616
might_alloc include/linux/sched/mm.h:303 [inline]
slab_pre_alloc_hook+0x2a/0x310 mm/slab.h:714
slab_alloc_node mm/slub.c:3477 [inline]
__kmem_cache_alloc_node+0x53/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0xa4/0x230 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
kobject_get_path+0xc3/0x2c0 lib/kobject.c:161
kobject_uevent_env+0x28a/0x8b0 lib/kobject_uevent.c:544
really_probe+0x715/0xb20 drivers/base/dd.c:708
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
hid_add_device+0x38d/0x530 drivers/hid/hid-core.c:2832
usbhid_probe+0xe02/0x1220 drivers/hid/usbhid/hid-core.c:1447
usb_probe_interface+0x5c9/0xb20 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2207
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x13d/0x270 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
usb_new_device+0xa3c/0x1660 drivers/usb/core/hub.c:2660
hub_port_connect drivers/usb/core/hub.c:5529 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5669 [inline]
port_event drivers/usb/core/hub.c:5833 [inline]
hub_event+0x29bf/0x49f0 drivers/usb/core/hub.c:5915
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
to a SOFTIRQ-irq-unsafe lock:
(tasklist_lock){.+.+}-{2:2}
... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
other info that might help us debug this:
Chain exists of:
&client->buffer_lock --> &f->f_owner.lock --> tasklist_lock
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(tasklist_lock);
local_irq_disable();
lock(&client->buffer_lock);
lock(&f->f_owner.lock);
<Interrupt>
lock(&client->buffer_lock);
*** DEADLOCK ***
2 locks held by syz.0.6650/24772:
#0: ffff88807bbe7e80 (&u->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#0: ffff88807bbe7e80 (&u->lock){+.+.}-{2:2}, at: queue_oob+0x1e2/0x4f0 net/unix/af_unix.c:2190
#1: ffff88805a206b18 (&f->f_owner.lock){....}-{2:2}, at: send_sigurg+0x29/0x3c0 fs/fcntl.c:811
the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&client->buffer_lock){..-.}-{2:2} {
IN-SOFTIRQ-W at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
input_event+0x8c/0xc0 drivers/input/input.c:435
input_sync include/linux/input.h:450 [inline]
hidinput_report_event+0xa1/0xf0 drivers/hid/hid-input.c:1750
hid_report_raw_event+0x151d/0x1750 drivers/hid/hid-core.c:2038
hid_input_report+0x434/0x510 drivers/hid/hid-core.c:2105
hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284
__usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
dummy_timer+0xc04/0x3080 drivers/usb/gadget/udc/dummy_hcd.c:1993
__run_hrtimer kernel/time/hrtimer.c:1750 [inline]
__hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1814
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1831
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758
fs_reclaim_acquire+0x98/0x100 mm/page_alloc.c:3616
might_alloc include/linux/sched/mm.h:303 [inline]
slab_pre_alloc_hook+0x2a/0x310 mm/slab.h:714
slab_alloc_node mm/slub.c:3477 [inline]
__kmem_cache_alloc_node+0x53/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0xa4/0x230 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
kobject_get_path+0xc3/0x2c0 lib/kobject.c:161
kobject_uevent_env+0x28a/0x8b0 lib/kobject_uevent.c:544
really_probe+0x715/0xb20 drivers/base/dd.c:708
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
hid_add_device+0x38d/0x530 drivers/hid/hid-core.c:2832
usbhid_probe+0xe02/0x1220 drivers/hid/usbhid/hid-core.c:1447
usb_probe_interface+0x5c9/0xb20 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2207
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x13d/0x270 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
usb_new_device+0xa3c/0x1660 drivers/usb/core/hub.c:2660
hub_port_connect drivers/usb/core/hub.c:5529 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5669 [inline]
port_event drivers/usb/core/hub.c:5833 [inline]
hub_event+0x29bf/0x49f0 drivers/usb/core/hub.c:5915
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
input_inject_event+0x1f9/0x320 drivers/input/input.c:465
evdev_write+0x35f/0x490 drivers/input/evdev.c:530
vfs_write+0x296/0x990 fs/read_write.c:582
ksys_write+0x150/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
}
... key at: [<ffffffff9762cd20>] evdev_open.__key.28+0x0/0x20
-> (&new->fa_lock){....}-{2:2} {
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326
fasync_remove_entry+0xf4/0x1c0 fs/fcntl.c:867
sock_fasync+0x88/0xf0 net/socket.c:1445
__fput+0x7f3/0x970 fs/file_table.c:381
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
INITIAL READ USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:990 [inline]
kill_fasync+0x192/0x4b0 fs/fcntl.c:1011
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async+0x17f/0x280 include/net/sock.h:2615
mptcp_destroy_common+0x113/0x4c0 net/mptcp/protocol.c:3488
mptcp_disconnect+0x204/0x520 net/mptcp/protocol.c:3297
inet_shutdown+0x1be/0x370 net/ipv4/af_inet.c:934
__sys_shutdown_sock net/socket.c:2435 [inline]
__sys_shutdown net/socket.c:2447 [inline]
__do_sys_shutdown net/socket.c:2455 [inline]
__se_sys_shutdown net/socket.c:2453 [inline]
__x64_sys_shutdown+0x174/0x1d0 net/socket.c:2453
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
}
... key at: [<ffffffff97333b20>] fasync_insert_entry.__key+0x0/0x20
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:990 [inline]
kill_fasync+0x192/0x4b0 fs/fcntl.c:1011
__pass_event drivers/input/evdev.c:240 [inline]
evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278
evdev_events+0x1d8/0x330 drivers/input/evdev.c:306
input_to_handler drivers/input/input.c:129 [inline]
input_pass_values+0x905/0x12f0 drivers/input/input.c:161
input_event_dispose+0x346/0x6c0 drivers/input/input.c:378
input_inject_event+0x1f9/0x320 drivers/input/input.c:465
evdev_write+0x35f/0x490 drivers/input/evdev.c:530
vfs_write+0x296/0x990 fs/read_write.c:582
ksys_write+0x150/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> (&f->f_owner.lock){....}-{2:2} {
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326
__f_setown+0x3b/0x330 fs/fcntl.c:92
fcntl_dirnotify+0x6e2/0x8d0 fs/notify/dnotify/dnotify.c:369
do_fcntl+0x390/0x1490 fs/fcntl.c:400
__do_sys_fcntl fs/fcntl.c:448 [inline]
__se_sys_fcntl+0xc9/0x1a0 fs/fcntl.c:433
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
INITIAL READ USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
send_sigio+0x33/0x360 fs/fcntl.c:772
kill_fasync_rcu fs/fcntl.c:997 [inline]
kill_fasync+0x228/0x4b0 fs/fcntl.c:1011
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async+0x17f/0x280 include/net/sock.h:2615
mptcp_destroy_common+0x113/0x4c0 net/mptcp/protocol.c:3488
mptcp_disconnect+0x204/0x520 net/mptcp/protocol.c:3297
inet_shutdown+0x1be/0x370 net/ipv4/af_inet.c:934
__sys_shutdown_sock net/socket.c:2435 [inline]
__sys_shutdown net/socket.c:2447 [inline]
__do_sys_shutdown net/socket.c:2455 [inline]
__se_sys_shutdown net/socket.c:2453 [inline]
__x64_sys_shutdown+0x174/0x1d0 net/socket.c:2453
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
}
... key at: [<ffffffff97332ea0>] init_file.__key+0x0/0x20
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236
send_sigio+0x33/0x360 fs/fcntl.c:772
kill_fasync_rcu fs/fcntl.c:997 [inline]
kill_fasync+0x228/0x4b0 fs/fcntl.c:1011
sock_wake_async+0x137/0x160 net/socket.c:-1
sk_wake_async+0x17f/0x280 include/net/sock.h:2615
mptcp_destroy_common+0x113/0x4c0 net/mptcp/protocol.c:3488
mptcp_disconnect+0x204/0x520 net/mptcp/protocol.c:3297
inet_shutdown+0x1be/0x370 net/ipv4/af_inet.c:934
__sys_shutdown_sock net/socket.c:2435 [inline]
__sys_shutdown net/socket.c:2447 [inline]
__do_sys_shutdown net/socket.c:2455 [inline]
__se_sys_shutdown net/socket.c:2453 [inline]
__x64_sys_shutdown+0x174/0x1d0 net/socket.c:2453
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{2:2} {
HARDIRQ-ON-R at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
SOFTIRQ-ON-R at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INITIAL USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326
copy_process+0x2275/0x3d80 kernel/fork.c:2631
kernel_clone+0x24b/0x8a0 kernel/fork.c:2914
user_mode_thread+0x111/0x180 kernel/fork.c:2992
rest_init+0x27/0x300 init/main.c:709
arch_call_rest_init+0xe/0x10 init/main.c:841
start_kernel+0x459/0x4e0 init/main.c:1086
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
copy_bootdata+0x0/0xe0 arch/x86/kernel/head64.c:536
secondary_startup_64_no_verify+0x179/0x17b
INITIAL READ USE at:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
do_wait+0x294/0xae0 kernel/exit.c:1607
kernel_wait+0xd7/0x1c0 kernel/exit.c:1797
call_usermodehelper_exec_sync kernel/umh.c:137 [inline]
call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
}
... key at: [<ffffffff8ce0a058>] tasklist_lock+0x18/0x40
... acquired at:
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
send_sigurg+0xf0/0x3c0 fs/fcntl.c:827
sk_send_sigurg+0x6f/0xc0 net/core/sock.c:3412
queue_oob+0x3f1/0x4f0 net/unix/af_unix.c:2207
unix_stream_sendmsg+0xaf0/0xbf0 net/unix/af_unix.c:2326
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5ba/0x960 net/socket.c:2594
___sys_sendmsg+0x2a6/0x360 net/socket.c:2648
__sys_sendmmsg+0x2ca/0x510 net/socket.c:2734
__do_sys_sendmmsg net/socket.c:2763 [inline]
__se_sys_sendmmsg net/socket.c:2760 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2760
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
stack backtrace:
CPU: 0 PID: 24772 Comm: syz.0.6650 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_bad_irq_dependency kernel/locking/lockdep.c:2626 [inline]
check_irq_usage kernel/locking/lockdep.c:2865 [inline]
check_prev_add kernel/locking/lockdep.c:3138 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x6851/0x7d40 kernel/locking/lockdep.c:5137
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
send_sigurg+0xf0/0x3c0 fs/fcntl.c:827
sk_send_sigurg+0x6f/0xc0 net/core/sock.c:3412
queue_oob+0x3f1/0x4f0 net/unix/af_unix.c:2207
unix_stream_sendmsg+0xaf0/0xbf0 net/unix/af_unix.c:2326
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5ba/0x960 net/socket.c:2594
___sys_sendmsg+0x2a6/0x360 net/socket.c:2648
__sys_sendmmsg+0x2ca/0x510 net/socket.c:2734
__do_sys_sendmmsg net/socket.c:2763 [inline]
__se_sys_sendmmsg net/socket.c:2760 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2760
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0c21d9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0c22ccf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f0c22015fa0 RCX: 00007f0c21d9c799
RDX: 0000000000000001 RSI: 0000200000011500 RDI: 0000000000000003
RBP: 00007f0c21e32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000040015 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0c22016038 R14: 00007f0c22015fa0 R15: 00007ffcff77a058
</TASK>
---
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