Warning: Permanently added '10.128.0.205' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 65.186823][ T8425] [ 65.189335][ T8425] ============================================ [ 65.195460][ T8425] WARNING: possible recursive locking detected [ 65.201591][ T8425] 5.13.0-rc6-syzkaller #0 Not tainted [ 65.206934][ T8425] -------------------------------------------- [ 65.213057][ T8425] syz-executor829/8425 is trying to acquire lock: [ 65.219603][ T8425] ffff8880295c9130 (&runtime->sleep){....}-{2:2}, at: io_poll_double_wake+0x2d1/0x770 [ 65.229157][ T8425] [ 65.229157][ T8425] but task is already holding lock: [ 65.236494][ T8425] ffff888019277130 (&runtime->sleep){....}-{2:2}, at: __wake_up_common_lock+0xb4/0x130 [ 65.246120][ T8425] [ 65.246120][ T8425] other info that might help us debug this: [ 65.254151][ T8425] Possible unsafe locking scenario: [ 65.254151][ T8425] [ 65.261573][ T8425] CPU0 [ 65.264828][ T8425] ---- [ 65.268083][ T8425] lock(&runtime->sleep); [ 65.272474][ T8425] lock(&runtime->sleep); [ 65.276862][ T8425] [ 65.276862][ T8425] *** DEADLOCK *** [ 65.276862][ T8425] [ 65.285011][ T8425] May be due to missing lock nesting notation [ 65.285011][ T8425] [ 65.293302][ T8425] 3 locks held by syz-executor829/8425: [ 65.298857][ T8425] #0: ffff888019277440 (&runtime->oss.params_lock){+.+.}-{3:3}, at: snd_pcm_oss_get_active_substream+0x142/0x1c0 [ 65.310841][ T8425] #1: ffff8880281ca908 (&group->lock){....}-{2:2}, at: snd_pcm_drop+0x131/0x320 [ 65.319956][ T8425] #2: ffff888019277130 (&runtime->sleep){....}-{2:2}, at: __wake_up_common_lock+0xb4/0x130 [ 65.330018][ T8425] [ 65.330018][ T8425] stack backtrace: [ 65.335879][ T8425] CPU: 1 PID: 8425 Comm: syz-executor829 Not tainted 5.13.0-rc6-syzkaller #0 [ 65.344804][ T8425] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.354847][ T8425] Call Trace: [ 65.358109][ T8425] dump_stack+0x141/0x1d7 [ 65.362430][ T8425] __lock_acquire.cold+0x22f/0x3b4 [ 65.367606][ T8425] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 65.373569][ T8425] ? lockdep_unlock+0x11c/0x290 [ 65.378397][ T8425] ? __lock_acquire+0x251c/0x5230 [ 65.383401][ T8425] lock_acquire+0x1ab/0x740 [ 65.387883][ T8425] ? io_poll_double_wake+0x2d1/0x770 [ 65.393161][ T8425] ? lock_release+0x720/0x720 [ 65.397822][ T8425] _raw_spin_lock+0x2a/0x40 [ 65.402312][ T8425] ? io_poll_double_wake+0x2d1/0x770 [ 65.407570][ T8425] io_poll_double_wake+0x2d1/0x770 [ 65.412658][ T8425] __wake_up_common+0x147/0x650 [ 65.417490][ T8425] __wake_up_common_lock+0xd0/0x130 [ 65.422667][ T8425] ? __wake_up_common+0x650/0x650 [ 65.427667][ T8425] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 65.433456][ T8425] ? snd_timer_notify+0x2fe/0x3d0 [ 65.438482][ T8425] snd_pcm_post_stop+0xb9/0x1f0 [ 65.443332][ T8425] snd_pcm_action+0x143/0x170 [ 65.448047][ T8425] snd_pcm_drop+0x1ab/0x320 [ 65.452537][ T8425] snd_pcm_kernel_ioctl+0x12f/0x240 [ 65.457779][ T8425] snd_pcm_oss_change_params_locked+0x194b/0x39a0 [ 65.464181][ T8425] ? snd_pcm_plugin_append+0x190/0x190 [ 65.469737][ T8425] ? mutex_lock_io_nested+0xf20/0xf20 [ 65.475114][ T8425] snd_pcm_oss_get_active_substream+0x164/0x1c0 [ 65.481337][ T8425] snd_pcm_oss_ioctl+0x144f/0x3430 [ 65.486439][ T8425] ? snd_pcm_oss_release+0x300/0x300 [ 65.491749][ T8425] ? __fget_files+0x288/0x3d0 [ 65.496425][ T8425] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 65.502752][ T8425] ? snd_pcm_oss_release+0x300/0x300 [ 65.508016][ T8425] __x64_sys_ioctl+0x193/0x200 [ 65.512779][ T8425] do_syscall_64+0x3a/0xb0 [ 65.517174][ T8425] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 65.523047][ T8425] RIP: 0033:0x43f099 [ 65.526920][ T8425] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 65.546501][ T8425] RSP: 002b:00007fff3eeb7ea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 65.554887][ T8425] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000043f099 [ 65.562924][ T8425] RDX: 0000000020000240 RSI: 00000000c0045002 RDI: 0000000000000004 [ 65.570881][ T8425] RBP: 0000000000403080 R08: 0000000000000000 R09: 0000000000000000 [ 65.578825][ T8425] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403110 [ 65.586778][ T8425]