Hi All,
After rebasing my recent Bay Trail rt5640 patch series on top of broonie/sound.git/for-5.17 I'm seeing the following new lockdep warning on devices running the rebased branch:
[ 131.404755] ============================================ [ 131.404762] WARNING: possible recursive locking detected [ 131.404769] 5.16.0-rc8+ #758 Tainted: G C [ 131.404777] -------------------------------------------- [ 131.404782] pipewire/1372 is trying to acquire lock: [ 131.404789] ffffa090838535a0 (&group->mutex){+.+.}-{3:3}, at: _snd_pcm_stream_lock_irqsave+0x2b/0x30 [snd_pcm] [ 131.404845] but task is already holding lock: [ 131.404851] ffffa09088e981a0 (&group->mutex){+.+.}-{3:3}, at: snd_pcm_action_lock_irq+0x2d/0x90 [snd_pcm] [ 131.404894] other info that might help us debug this: [ 131.404899] Possible unsafe locking scenario:
[ 131.404905] CPU0 [ 131.404909] ---- [ 131.404913] lock(&group->mutex); [ 131.404923] lock(&group->mutex); [ 131.404932] *** DEADLOCK ***
[ 131.404937] May be due to missing lock nesting notation
[ 131.404942] 1 lock held by pipewire/1372: [ 131.404950] #0: ffffa09088e981a0 (&group->mutex){+.+.}-{3:3}, at: snd_pcm_action_lock_irq+0x2d/0x90 [snd_pcm] [ 131.404994] stack backtrace: [ 131.405001] CPU: 2 PID: 1372 Comm: pipewire Tainted: G C 5.16.0-rc8+ #758 [ 131.405012] Hardware name: ASUSTeK COMPUTER INC. TF103CE/TF103CE, BIOS 5.6.5 09/03/2015 [ 131.405019] Call Trace: [ 131.405022] sd 0:0:0:0: [sda] 31805439 512-byte logical blocks: (16.3 GB/15.2 GiB) [ 131.405027] <TASK> [ 131.405034] dump_stack_lvl+0x59/0x73 [ 131.405057] __lock_acquire.cold+0xc5/0x2b8 [ 131.405081] lock_acquire+0xb5/0x2b0 [ 131.405095] ? _snd_pcm_stream_lock_irqsave+0x2b/0x30 [snd_pcm] [ 131.405128] ? lock_is_held_type+0xa8/0x120 [ 131.405148] __mutex_lock+0x92/0x8a0 [ 131.405163] ? _snd_pcm_stream_lock_irqsave+0x2b/0x30 [snd_pcm] [ 131.405195] ? mark_held_locks+0x49/0x70 [ 131.405208] ? _snd_pcm_stream_lock_irqsave+0x2b/0x30 [snd_pcm] [ 131.405241] ? _raw_spin_unlock_irqrestore+0x2d/0x50 [ 131.405260] ? _snd_pcm_stream_lock_irqsave+0x2b/0x30 [snd_pcm] [ 131.405291] _snd_pcm_stream_lock_irqsave+0x2b/0x30 [snd_pcm] [ 131.405322] dpcm_be_dai_trigger+0xae/0x410 [snd_soc_core] [ 131.405404] sda: detected capacity change from 0 to 31805439 [ 131.405406] dpcm_fe_dai_do_trigger+0x84/0x1b0 [snd_soc_core] [ 131.405480] snd_pcm_action+0x79/0xc0 [snd_pcm] [ 131.405515] snd_pcm_action_lock_irq+0x3b/0x90 [snd_pcm] [ 131.405549] snd_pcm_ioctl+0x23/0x30 [snd_pcm] [ 131.405581] __x64_sys_ioctl+0x82/0xb0 [ 131.405599] do_syscall_64+0x3b/0x90 [ 131.405612] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 131.405624] RIP: 0033:0x7f70c0b2e37b [ 131.405637] Code: ff ff ff 85 c0 79 9b 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 7d 2a 0f 00 f7 d8 64 89 01 48 [ 131.405647] RSP: 002b:00007ffdfdd46e88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 131.405660] RAX: ffffffffffffffda RBX: 00005584f8f43a40 RCX: 00007f70c0b2e37b [ 131.405669] RDX: 0000000000000000 RSI: 0000000000004142 RDI: 0000000000000048 [ 131.405676] RBP: 0000000000000002 R08: 00007f70b16eb000 R09: 0000000000000800 [ 131.405684] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 131.405692] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000003 [ 131.405711] </TASK>
It seems we now have some nested locking going on without proper lockdep annotations (that or a deadlock, but everything still seems to work fine).
Regards,
Hans