[v6.1] INFO: rcu detected stall in sock_close (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 909ba1f1b414 Linux 6.1.90
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17391cf4980000
kernel config: https://syzkaller.appspot.com/x/.config?x=3be6d6f79b879a67
dashboard link: https://syzkaller.appspot.com/bug?extid=0f2ae23131d930bc5ad3
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/63178de7cba7/disk-909ba1f1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/25dec90d8126/vmlinux-909ba1f1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/25509ea1c6cd/bzImage-909ba1f1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0f2ae2...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4421/1:b..l
(detected by 1, t=10502 jiffies, g=10921, q=16 ncpus=2)
task:syz-executor.2 state:R running task stack:22120 pid:4421 ppid:3567 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6727
preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6751
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
_raw_spin_unlock_irq+0x3c/0x40 kernel/locking/spinlock.c:202
spin_unlock_irq include/linux/spinlock.h:401 [inline]
loop_queue_work drivers/block/loop.c:896 [inline]
loop_queue_rq+0xa02/0xaf0 drivers/block/loop.c:1876
__blk_mq_issue_directly block/blk-mq.c:2626 [inline]
__blk_mq_try_issue_directly+0x4fe/0x820 block/blk-mq.c:2679
blk_mq_try_issue_directly+0x28/0x1f0 block/blk-mq.c:2703
blk_mq_submit_bio+0x162c/0x2590 block/blk-mq.c:3049
__submit_bio+0x261/0x2f0 block/blk-core.c:590
__submit_bio_noacct_mq block/blk-core.c:667 [inline]
submit_bio_noacct_nocheck+0x976/0xd10 block/blk-core.c:696
submit_bh fs/buffer.c:2707 [inline]
__bread_slow fs/buffer.c:1177 [inline]
__bread_gfp+0x1e8/0x370 fs/buffer.c:1370
sb_bread_unmovable include/linux/buffer_head.h:344 [inline]
ntfs_bread fs/ntfs3/fsntfs.c:994 [inline]
ntfs_read_run_nb+0x599/0xf60 fs/ntfs3/fsntfs.c:1214
ntfs_read_bh+0x3c/0x770 fs/ntfs3/fsntfs.c:1282
mi_read+0x1e9/0x5a0 fs/ntfs3/record.c:133
ntfs_read_mft fs/ntfs3/inode.c:69 [inline]
ntfs_iget5+0x48a/0x3920 fs/ntfs3/inode.c:524
dir_search_u+0x2f6/0x390 fs/ntfs3/dir.c:264
ntfs_extend_init+0x191/0x530 fs/ntfs3/fsntfs.c:214
ntfs_fill_super+0x407a/0x4410 fs/ntfs3/super.c:1243
get_tree_bdev+0x3fe/0x620 fs/super.c:1355
vfs_get_tree+0x88/0x270 fs/super.c:1562
do_new_mount+0x2ba/0xb40 fs/namespace.c:3051
do_mount fs/namespace.c:3394 [inline]
__do_sys_mount fs/namespace.c:3602 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3579
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f414567f46a
RSP: 002b:00007f4146481ef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4146481f80 RCX: 00007f414567f46a
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 00007f4146481f40
RBP: 0000000020000100 R08: 00007f4146481f80 R09: 000000000080c018
R10: 000000000080c018 R11: 0000000000000202 R12: 00000000200000c0
R13: 00007f4146481f40 R14: 000000000001f234 R15: 0000000020000140
</TASK>
rcu: rcu_preempt kthread starved for 10511 jiffies! g10921 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:25528 pid:16 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 4426 Comm: syz-executor.0 Not tainted 6.1.90-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:finish_task_switch+0x1d3/0x810 kernel/sched/core.c:5124
Code: 37 0b 00 48 83 c4 08 4c 89 f7 e8 98 30 00 00 0f 1f 44 00 00 4c 89 f7 e8 7b d0 35 09 e8 36 26 32 00 fb 49 8d bc 24 f8 15 00 00 <48> 89 f8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df 42 0f b6 04 28
RSP: 0018:ffffc900036df388 EFLAGS: 00000282
RAX: 8966314565c04f00 RBX: ffff8880783d8034 RCX: ffffffff816acf0a
RDX: dffffc0000000000 RSI: ffffffff8aec01c0 RDI: ffff88807cd133b8
RBP: ffffc900036df3d0 R08: dffffc0000000000 R09: fffffbfff2093658
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807cd11dc0
R13: 1ffff110173276eb R14: ffff8880b993aa00 R15: ffff8880b993b758
FS: 0000555556769480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2aa492bf80 CR3: 000000007598f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
</IRQ>
<TASK>
context_switch kernel/sched/core.c:5248 [inline]
__schedule+0x1435/0x4550 kernel/sched/core.c:6558
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
irqentry_exit+0x53/0x80 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:kasan_check_range+0x5/0x290 mm/kasan/generic.c:188
Code: c7 e8 cf 71 a9 08 31 c0 c3 0f 0b b8 ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc cc cc cc cc 55 41 57 41 56 <53> b0 01 48 85 f6 0f 84 9a 01 00 00 48 89 fd 48 01 f5 0f 82 5a 02
RSP: 0018:ffffc900036df720 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88807cd11dc0 RCX: ffffffff8a933c06
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88807cd11dc0
RBP: ffffc900036df7f8 R08: dffffc0000000000 R09: fffffbfff2093658
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920006dbef0
R13: 1ffff920006dbf0c R14: ffffffff8a933b59 R15: dffffc0000000000
instrument_atomic_read include/linux/instrumented.h:72 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
test_ti_thread_flag include/linux/thread_info.h:118 [inline]
need_resched include/linux/sched.h:2231 [inline]
preempt_schedule_common+0xa6/0xd0 kernel/sched/core.c:6735
preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6751
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x128/0x130 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__wake_up_common_lock kernel/sched/wait.c:140 [inline]
__wake_up_sync_key+0x121/0x1c0 kernel/sched/wait.c:208
unix_write_space+0x1fc/0x370 net/unix/af_unix.c:535
sock_wfree+0x1b3/0x610 net/core/sock.c:2444
unix_destruct_scm+0x2e3/0x350 net/unix/scm.c:152
skb_release_head_state+0xf9/0x230 net/core/skbuff.c:843
skb_release_all net/core/skbuff.c:854 [inline]
__kfree_skb net/core/skbuff.c:870 [inline]
kfree_skb_reason+0x13d/0x390 net/core/skbuff.c:893
kfree_skb include/linux/skbuff.h:1220 [inline]
unix_release_sock+0x99c/0xcf0 net/unix/af_unix.c:647
unix_release+0x88/0xc0 net/unix/af_unix.c:1039
__sock_release net/socket.c:654 [inline]
sock_close+0xcd/0x230 net/socket.c:1400
__fput+0x3b7/0x890 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2aa3c7cc5a
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24
RSP: 002b:00007ffc999e30e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f2aa3c7cc5a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f2aa3dad980 R08: 0000001b31f20000 R09: 000000000000008b
R10: 00000000818e5ae0 R11: 0000000000000293 R12: 00000000000187d0
R13: 00007f2aa3dac12c R14: 00007f2aa3dac120 R15: 0000000000000032
</TASK>


---
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[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 83655231580b Linux 5.15.159
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=178107d0980000
kernel config: https://syzkaller.appspot.com/x/.config?x=ea870d7ee19c0a5c
dashboard link: https://syzkaller.appspot.com/bug?extid=70b74492098cf96cdf23

compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:

disk image: https://storage.googleapis.com/syzbot-assets/d5444b7453a0/disk-83655231.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/76ae736a43a3/vmlinux-83655231.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2540e00ba747/bzImage-83655231.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+70b744...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (1 GPs behind) idle=99f/1/0x4000000000000000 softirq=18910/18912 fqs=14
(t=10500 jiffies g=25909 q=196)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10463 jiffies! g25909 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=8306
rcu: rcu_preempt kthread starved for 10464 jiffies! g25909 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0

rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:

task:rcu_preempt state:I stack:26080 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
schedule+0x11b/0x1f0 kernel/sched/core.c:6459
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914
rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300

</TASK>
rcu: Stack dump where RCU GP kthread last ran:

Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5754 Comm: syz-executor.0 Not tainted 5.15.159-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024

RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x1b4/0x200 arch/x86/kernel/kvm.c:918
Code: e0 48 c1 e8 03 42 0f b6 04 28 84 c0 75 42 45 0f b6 34 24 e8 8e d9 4e 00 44 3a 74 24 1c 75 10 66 90 0f 00 2d 5e 7c 50 09 fb f4 <e9> c8 fe ff ff fb e9 c2 fe ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 54
RSP: 0018:ffffc90002ce7960 EFLAGS: 00000246
RAX: b5495984a2ee8c00 RBX: 1ffff9200059cf30 RCX: ffffffff81631938
RDX: dffffc0000000000 RSI: ffffffff8a8b2980 RDI: ffffffff8ad8f680
RBP: ffffc90002ce7a30 R08: dffffc0000000000 R09: fffffbfff1f7f03b
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888024463888
R13: dffffc0000000000 R14: 0000000000000003 R15: ffffc90002ce79a0
FS: 0000555556d41480(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000c000263000 CR3: 000000001eb79000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:

<NMI>
</NMI>
<TASK>
pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
__pv_queued_spin_lock_slowpath+0x6bc/0xc40 kernel/locking/qspinlock.c:508
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
queued_spin_lock_slowpath+0x42/0x50 arch/x86/include/asm/qspinlock.h:51
queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
do_raw_spin_lock+0x269/0x370 kernel/locking/spinlock_debug.c:115
spin_lock_bh include/linux/spinlock.h:368 [inline]
lock_sock_nested+0x68/0x100 net/core/sock.c:3253
lock_sock include/net/sock.h:1668 [inline]
tipc_release+0xb0/0x16d0 net/tipc/socket.c:639
__sock_release net/socket.c:649 [inline]
sock_close+0xcd/0x230 net/socket.c:1336
__fput+0x3bf/0x890 fs/file_table.c:280
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa064940dda

Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24

RSP: 002b:00007ffe0fe41b50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00007fa064940dda
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fa064a72980 R08: 0000001b30220000 R09: 00000000000000be
R10: 000000008186d8d8 R11: 0000000000000293 R12: 000000000003003d
R13: 00007fa064a7105c R14: 00007fa064a71050 R15: 0000000000000032
</TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 5755 Comm: syz-executor.0 Not tainted 5.15.159-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024

Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
rcu_dump_cpu_stacks+0x223/0x390 kernel/rcu/tree_stall.h:349
print_cpu_stall+0x320/0x600 kernel/rcu/tree_stall.h:633
check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
rcu_pending kernel/rcu/tree.c:3932 [inline]
rcu_sched_clock_irq+0x8d9/0x1150 kernel/rcu/tree.c:2619
update_process_times+0x196/0x200 kernel/time/timer.c:1818
tick_sched_handle kernel/time/tick-sched.c:254 [inline]
tick_sched_timer+0x386/0x550 kernel/time/tick-sched.c:1473
__run_hrtimer kernel/time/hrtimer.c:1686 [inline]
__hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1750
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
__sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_acquire+0x252/0x4f0 kernel/locking/lockdep.c:5627
Code: 2b 00 74 08 4c 89 f7 e8 fc 7c 67 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc900031264e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000624ca8 RCX: 1ffff92000624c48
RDX: dffffc0000000000 RSI: ffffffff8a8b3c20 RDI: ffffffff8ad8f680
RBP: ffffc90003126640 R08: dffffc0000000000 R09: fffffbfff1f7f019
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000624ca4
R13: dffffc0000000000 R14: ffffc90003126540 R15: 0000000000000246
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
rcu_read_lock include/linux/rcupdate.h:739 [inline]
tipc_sk_lookup+0xc9/0x920 net/tipc/socket.c:2998
tipc_sk_rcv+0x428/0x1d40 net/tipc/socket.c:2492
tipc_node_xmit+0x1b7/0xf20 net/tipc/node.c:1703
tipc_node_xmit_skb+0x145/0x1b0 net/tipc/node.c:1768
tipc_sk_rcv+0x1ab7/0x1d40 net/tipc/socket.c:2522
tipc_node_xmit+0x1b7/0xf20 net/tipc/node.c:1703
tipc_sk_push_backlog net/tipc/socket.c:1316 [inline]
tipc_sk_filter_connect net/tipc/socket.c:2255 [inline]
tipc_sk_filter_rcv+0x18a2/0x33d0 net/tipc/socket.c:2364
tipc_sk_enqueue net/tipc/socket.c:2445 [inline]
tipc_sk_rcv+0x8a7/0x1d40 net/tipc/socket.c:2497
tipc_node_xmit+0x1b7/0xf20 net/tipc/node.c:1703
tipc_node_xmit_skb net/tipc/node.c:1768 [inline]
tipc_node_distr_xmit+0x309/0x440 net/tipc/node.c:1783
tipc_sk_backlog_rcv+0x199/0x220 net/tipc/socket.c:2412
sk_backlog_rcv include/net/sock.h:1059 [inline]
__release_sock+0x198/0x4b0 net/core/sock.c:2724
release_sock+0x5d/0x1c0 net/core/sock.c:3265
tipc_release+0x125f/0x16d0 net/tipc/socket.c:652
__sock_release net/socket.c:649 [inline]
sock_close+0xcd/0x230 net/socket.c:1336
__fput+0x3bf/0x890 fs/file_table.c:280
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa064941ee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa062eb50c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000203a0 RBX: 00007fa064a70f80 RCX: 00007fa064941ee9
RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000004
RBP: 00007fa06498e49e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fa064a70f80 R15: 00007ffe0fe41a88

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 83655231580b Linux 5.15.159
git tree: linux-5.15.y

console output: https://syzkaller.appspot.com/x/log.txt?x=10e263f4980000

kernel config: https://syzkaller.appspot.com/x/.config?x=ea870d7ee19c0a5c
dashboard link: https://syzkaller.appspot.com/bug?extid=70b74492098cf96cdf23
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153cbe58980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12a29b3f180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d5444b7453a0/disk-83655231.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/76ae736a43a3/vmlinux-83655231.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2540e00ba747/bzImage-83655231.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+70b744...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt self-detected stall on CPU

rcu: 0-...!: (10501 ticks this GP) idle=bf5/1/0x4000000000000000 softirq=4775/4775 fqs=0
(t=10502 jiffies g=4693 q=5)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g4693 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=9639
rcu: rcu_preempt kthread starved for 10505 jiffies! g4693 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0

rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:

task:rcu_preempt state:I stack:26368 pid: 15 ppid: 2 flags:0x00004000

Call Trace:
<TASK>
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
schedule+0x11b/0x1f0 kernel/sched/core.c:6459
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914
rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
</TASK>
rcu: Stack dump where RCU GP kthread last ran:

NMI backtrace for cpu 0

CPU: 0 PID: 3638 Comm: syz-executor325 Not tainted 5.15.159-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]

rcu_check_gp_kthread_starvation+0x1d2/0x240 kernel/rcu/tree_stall.h:487
print_cpu_stall+0x31b/0x600 kernel/rcu/tree_stall.h:631

check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
rcu_pending kernel/rcu/tree.c:3932 [inline]
rcu_sched_clock_irq+0x8d9/0x1150 kernel/rcu/tree.c:2619
update_process_times+0x196/0x200 kernel/time/timer.c:1818
tick_sched_handle kernel/time/tick-sched.c:254 [inline]
tick_sched_timer+0x386/0x550 kernel/time/tick-sched.c:1473
__run_hrtimer kernel/time/hrtimer.c:1686 [inline]
__hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1750
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
__sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_acquire+0x252/0x4f0 kernel/locking/lockdep.c:5627
Code: 2b 00 74 08 4c 89 f7 e8 fc 7c 67 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25

RSP: 0018:ffffc90002d864e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920005b0ca8 RCX: 1ffff920005b0c48

RDX: dffffc0000000000 RSI: ffffffff8a8b3c20 RDI: ffffffff8ad8f680

RBP: ffffc90002d86640 R08: dffffc0000000000 R09: fffffbfff1f7f019
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920005b0ca4
R13: dffffc0000000000 R14: ffffc90002d86540 R15: 0000000000000246

RIP: 0033:0x7fa17c093ae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa17c054218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000203a0 RBX: 00007fa17c11f328 RCX: 00007fa17c093ae9
RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000003
RBP: 00007fa17c11f320 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa17c0ec470
R13: 00007fa17c0ec080 R14: 618a5986bea2420f R15: 0cec9143de7537c6
</TASK>
NMI backtrace for cpu 0
CPU: 0 PID: 3638 Comm: syz-executor325 Not tainted 5.15.159-syzkaller #0

RSP: 0018:ffffc90002d864e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920005b0ca8 RCX: 1ffff920005b0c48

RDX: dffffc0000000000 RSI: ffffffff8a8b3c20 RDI: ffffffff8ad8f680

RBP: ffffc90002d86640 R08: dffffc0000000000 R09: fffffbfff1f7f019
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920005b0ca4
R13: dffffc0000000000 R14: ffffc90002d86540 R15: 0000000000000246

RIP: 0033:0x7fa17c093ae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa17c054218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000203a0 RBX: 00007fa17c11f328 RCX: 00007fa17c093ae9
RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000003
RBP: 00007fa17c11f320 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa17c0ec470
R13: 00007fa17c0ec080 R14: 618a5986bea2420f R15: 0cec9143de7537c6
</TASK>


---
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#syz test: git://repo/address.git branch-or-commit-hash
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