============================================ WARNING: possible recursive locking detected 5.16.0-rc2-syzkaller #0 Not tainted -------------------------------------------- syz-executor.1/14219 is trying to acquire lock: ffff88801bf19130 (&runtime->sleep){....}-{2:2} , at: io_poll_double_wake+0x2be/0x820 fs/io_uring.c:5423 but task is already holding lock: ffff88801bf1b130 (&runtime->sleep){....}-{2:2}, at: __wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:137 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&runtime->sleep); lock(&runtime->sleep); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by syz-executor.1/14219: #0: ffff88801bf1b440 (&runtime->oss.params_lock){+.+.}-{3:3}, at: snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1497 [inline] #0: ffff88801bf1b440 (&runtime->oss.params_lock){+.+.}-{3:3}, at: snd_pcm_oss_read+0x386/0x7b0 sound/core/oss/pcm_oss.c:2769 #1: ffff8880227d9910 (&group->lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:374 [inline] #1: ffff8880227d9910 (&group->lock){..-.}-{2:2}, at: snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline] #1: ffff8880227d9910 (&group->lock){..-.}-{2:2}, at: snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline] #1: ffff8880227d9910 (&group->lock){..-.}-{2:2}, at: snd_pcm_drop+0x131/0x320 sound/core/pcm_native.c:2150 #2: ffff88801bf1b130 (&runtime->sleep){....}-{2:2}, at: __wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:137 stack backtrace: CPU: 0 PID: 14219 Comm: syz-executor.1 Not tainted 5.16.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_deadlock_bug kernel/locking/lockdep.c:2956 [inline] check_deadlock kernel/locking/lockdep.c:2999 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire.cold+0x149/0x3ab kernel/locking/lockdep.c:5027 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 io_poll_double_wake+0x2be/0x820 fs/io_uring.c:5423 __wake_up_common+0x147/0x650 kernel/sched/wait.c:108 __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:138 snd_pcm_post_stop+0xb9/0x1f0 sound/core/pcm_native.c:1455 snd_pcm_action_single sound/core/pcm_native.c:1229 [inline] snd_pcm_action+0x143/0x170 sound/core/pcm_native.c:1310 snd_pcm_stop sound/core/pcm_native.c:1476 [inline] snd_pcm_drop+0x1ab/0x320 sound/core/pcm_native.c:2155 snd_pcm_kernel_ioctl+0x2af/0x310 sound/core/pcm_native.c:3382 snd_pcm_oss_change_params_locked+0x1926/0x3a60 sound/core/oss/pcm_oss.c:945 snd_pcm_oss_make_ready_locked+0xb3/0x130 sound/core/oss/pcm_oss.c:1173 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1501 [inline] snd_pcm_oss_read+0x3a8/0x7b0 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 RIP: 0033:0x7f31a7fafae9 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:00007f31a5525188 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f31a80c2f60 RCX: 00007f31a7fafae9 RDX: 0000000000000012 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 00007f31a8009f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd20a9de5f R14: 00007f31a5525300 R15: 0000000000022000