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Subjectpossible deadlock in snd_ctl_notify
From
Hello,

syzbot found the following issue on:

HEAD commit: dff9f829 Add linux-next specific files for 20200908
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12f43229900000
kernel config: https://syzkaller.appspot.com/x/.config?x=37b3426c77bda44c
dashboard link: https://syzkaller.appspot.com/bug?extid=a04707b50020dd3fe3f7
compiler: gcc (GCC) 10.1.0-syz 20200507

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a04707b50020dd3fe3f7@syzkaller.appspotmail.com

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.9.0-rc4-next-20200908-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor.3/8556 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff888214db8760 (&card->ctl_files_rwlock){.+.+}-{2:2}, at: snd_ctl_notify.part.0+0x36/0x550 sound/core/control.c:153

and this task is already holding:
ffff888214dc2108 (&group->lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:379 [inline]
ffff888214dc2108 (&group->lock){..-.}-{2:2}, at: snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline]
ffff888214dc2108 (&group->lock){..-.}-{2:2}, at: snd_pcm_stream_lock_irq+0x8e/0xb0 sound/core/pcm_native.c:136
which would create a new lock dependency:
(&group->lock){..-.}-{2:2} -> (&card->ctl_files_rwlock){.+.+}-{2:2}

but this new dependency connects a SOFTIRQ-irq-safe lock:
(&group->lock){..-.}-{2:2}

... which became SOFTIRQ-irq-safe at:
lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5398
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x94/0xd0 kernel/locking/spinlock.c:159
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170
snd_pcm_period_elapsed+0x24/0x250 sound/core/pcm_lib.c:1799
loopback_jiffies_timer_function+0x1a8/0x220 sound/drivers/aloop.c:669
call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413
expire_timers kernel/time/timer.c:1458 [inline]
__run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755
__run_timers kernel/time/timer.c:1736 [inline]
run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
__do_softirq+0x1f7/0xa91 kernel/softirq.c:298
asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
__run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:393 [inline]
__irq_exit_rcu kernel/softirq.c:423 [inline]
irq_exit_rcu+0x235/0x280 kernel/softirq.c:435
sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
unwind_next_frame+0xc51/0x1f90 arch/x86/kernel/unwind_orc.c:543
arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
kasan_set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
__do_kmalloc mm/slab.c:3655 [inline]
__kmalloc+0x27c/0x480 mm/slab.c:3664
kmalloc include/linux/slab.h:559 [inline]
tomoyo_realpath_from_path+0xc3/0x620 security/tomoyo/realpath.c:254
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x212/0x3f0 security/tomoyo/file.c:822
security_inode_getattr+0xcf/0x140 security/security.c:1278
vfs_getattr fs/stat.c:121 [inline]
vfs_statx+0x170/0x390 fs/stat.c:206
vfs_lstat include/linux/fs.h:3186 [inline]
__do_sys_newlstat+0x91/0x110 fs/stat.c:374
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

to a SOFTIRQ-irq-unsafe lock:
(&card->ctl_files_rwlock){.+.+}-{2:2}

... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5398
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
snd_ctl_notify.part.0+0x36/0x550 sound/core/control.c:153
snd_ctl_notify+0x8f/0xb0 sound/core/control.c:181
__snd_ctl_add_replace+0x638/0x800 sound/core/control.c:382
snd_ctl_add_replace+0x76/0x130 sound/core/control.c:399
snd_card_dummy_new_mixer sound/drivers/dummy.c:885 [inline]
snd_dummy_probe+0xbbf/0x1050 sound/drivers/dummy.c:1080
platform_drv_probe+0x87/0x140 drivers/base/platform.c:747
really_probe+0x282/0x9f0 drivers/base/dd.c:553
driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:738
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:844
bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
__device_attach+0x228/0x470 drivers/base/dd.c:912
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
device_add+0xb17/0x1c40 drivers/base/core.c:2926
platform_device_add+0x34f/0x6d0 drivers/base/platform.c:597
platform_device_register_full+0x38c/0x4e0 drivers/base/platform.c:720
platform_device_register_resndata include/linux/platform_device.h:131 [inline]
platform_device_register_simple include/linux/platform_device.h:160 [inline]
alsa_card_dummy_init+0x1cc/0x2e0 sound/drivers/dummy.c:1168
do_one_initcall+0x10a/0x7b0 init/main.c:1204
do_initcall_level init/main.c:1277 [inline]
do_initcalls init/main.c:1293 [inline]
do_basic_setup init/main.c:1313 [inline]
kernel_init_freeable+0x5e9/0x66d init/main.c:1512
kernel_init+0xd/0x1c0 init/main.c:1402
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

other info that might help us debug this:

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&card->ctl_files_rwlock);
local_irq_disable();
lock(&group->lock);
lock(&card->ctl_files_rwlock);
<Interrupt>
lock(&group->lock);

*** DEADLOCK ***

1 lock held by syz-executor.3/8556:
#0: ffff888214dc2108 (&group->lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:379 [inline]
#0: ffff888214dc2108 (&group->lock){..-.}-{2:2}, at: snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline]
#0: ffff888214dc2108 (&group->lock){..-.}-{2:2}, at: snd_pcm_stream_lock_irq+0x8e/0xb0 sound/core/pcm_native.c:136

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&group->lock){..-.}-{2:2} {
IN-SOFTIRQ-W at:
lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5398
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x94/0xd0 kernel/locking/spinlock.c:159
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170
snd_pcm_period_elapsed+0x24/0x250 sound/core/pcm_lib.c:1799
loopback_jiffies_timer_function+0x1a8/0x220 sound/drivers/aloop.c:669
call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413
expire_timers kernel/time/timer.c:1458 [inline]
__run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755
__run_timers kernel/time/timer.c:1736 [inline]
run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
__do_softirq+0x1f7/0xa91 kernel/softirq.c:298
asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
__run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:393 [inline]
__irq_exit_rcu kernel/softirq.c:423 [inline]
irq_exit_rcu+0x235/0x280 kernel/softirq.c:435
sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
unwind_next_frame+0xc51/0x1f90 arch/x86/kernel/unwind_orc.c:543
arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
kasan_set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
__do_kmalloc mm/slab.c:3655 [inline]
__kmalloc+0x27c/0x480 mm/slab.c:3664
kmalloc include/linux/slab.h:559 [inline]
tomoyo_realpath_from_path+0xc3/0x620 security/tomoyo/realpath.c:254
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x212/0x3f0 security/tomoyo/file.c:822
security_inode_getattr+0xcf/0x140 security/security.c:1278
vfs_getattr fs/stat.c:121 [inline]
vfs_statx+0x170/0x390 fs/stat.c:206
vfs_lstat include/linux/fs.h:3186 [inline]
__do_sys_newlstat+0x91/0x110 fs/stat.c:374
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
INITIAL USE at:
lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5398
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x94/0xd0 kernel/locking/spinlock.c:167
spin_lock_irq include/linux/spinlock.h:379 [inline]
snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline]
snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline]
snd_pcm_hw_params+0x12a/0x1880 sound/core/pcm_native.c:672
snd_pcm_kernel_ioctl+0xd1/0x240 sound/core/pcm_native.c:3325
snd_pcm_oss_change_params_locked+0x130c/0x3430 sound/core/oss/pcm_oss.c:941
snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1084 [inline]
snd_pcm_oss_get_active_substream+0x164/0x1c0 sound/core/oss/pcm_oss.c:1101
snd_pcm_oss_get_channels sound/core/oss/pcm_oss.c:1792 [inline]
snd_pcm_oss_set_channels+0x244/0x380 sound/core/oss/pcm_oss.c:1784
snd_pcm_oss_ioctl+0x17d5/0x3370 sound/core/oss/pcm_oss.c:2606
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
}
... key at: [<ffffffff8d607200>] __key.7+0x0/0x40
... acquired at:
lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5398
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
snd_ctl_notify.part.0+0x36/0x550 sound/core/control.c:153
snd_ctl_notify+0x8f/0xb0 sound/core/control.c:181
loopback_check_format sound/drivers/aloop.c:358 [inline]
loopback_trigger+0x10df/0x1990 sound/drivers/aloop.c:387
snd_pcm_do_start sound/core/pcm_native.c:1350 [inline]
snd_pcm_do_start+0xb1/0xf0 sound/core/pcm_native.c:1345
snd_pcm_action_single sound/core/pcm_native.c:1207 [inline]
snd_pcm_action+0xc8/0x170 sound/core/pcm_native.c:1290
__snd_pcm_lib_xfer+0x1202/0x1a90 sound/core/pcm_lib.c:2247
snd_pcm_oss_write3+0x107/0x320 sound/core/oss/pcm_oss.c:1221
io_playback_transfer+0x27e/0x330 sound/core/oss/io.c:47
snd_pcm_plug_write_transfer+0x2cd/0x3f0 sound/core/oss/pcm_plugin.c:624
snd_pcm_oss_write2+0x245/0x3f0 sound/core/oss/pcm_oss.c:1353
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1419 [inline]
snd_pcm_oss_write+0x705/0x940 sound/core/oss/pcm_oss.c:2765
vfs_write+0x28e/0x700 fs/read_write.c:593
ksys_write+0x12d/0x250 fs/read_write.c:648
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9


the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (&card->ctl_files_rwlock){.+.+}-{2:2} {
HARDIRQ-ON-R at:
lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5398
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
snd_ctl_notify.part.0+0x36/0x550 sound/core/control.c:153
snd_ctl_notify+0x8f/0xb0 sound/core/control.c:181
__snd_ctl_add_replace+0x638/0x800 sound/core/control.c:382
snd_ctl_add_replace+0x76/0x130 sound/core/control.c:399
snd_card_dummy_new_mixer sound/drivers/dummy.c:885 [inline]
snd_dummy_probe+0xbbf/0x1050 sound/drivers/dummy.c:1080
platform_drv_probe+0x87/0x140 drivers/base/platform.c:747
really_probe+0x282/0x9f0 drivers/base/dd.c:553
driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:738
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:844
bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
__device_attach+0x228/0x470 drivers/base/dd.c:912
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
device_add+0xb17/0x1c40 drivers/base/core.c:2926
platform_device_add+0x34f/0x6d0 drivers/base/platform.c:597
platform_device_register_full+0x38c/0x4e0 drivers/base/platform.c:720
platform_device_register_resndata include/linux/platform_device.h:131 [inline]
platform_device_register_simple include/linux/platform_device.h:160 [inline]
alsa_card_dummy_init+0x1cc/0x2e0 sound/drivers/dummy.c:1168
do_one_initcall+0x10a/0x7b0 init/main.c:1204
do_initcall_level init/main.c:1277 [inline]
do_initcalls init/main.c:1293 [inline]
do_basic_setup init/main.c:1313 [inline]
kernel_init_freeable+0x5e9/0x66d init/main.c:1512
kernel_init+0xd/0x1c0 init/main.c:1402
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
SOFTIRQ-ON-R at:
lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5398
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
snd_ctl_notify.part.0+0x36/0x550 sound/core/control.c:153
snd_ctl_notify+0x8f/0xb0 sound/core/control.c:181
__snd_ctl_add_replace+0x638/0x800 sound/core/control.c:382
snd_ctl_add_replace+0x76/0x130 sound/core/control.c:399
snd_card_dummy_new_mixer sound/drivers/dummy.c:885 [inline]
snd_dummy_probe+0xbbf/0x1050 sound/drivers/dummy.c:1080
platform_drv_probe+0x87/0x140 drivers/base/platform.c:747
really_probe+0x282/0x9f0 drivers/base/dd.c:553
driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:738
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:844
bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
__device_attach+0x228/0x470 drivers/base/dd.c:912
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
device_add+0xb17/0x1c40 drivers/base/core.c:2926
platform_device_add+0x34f/0x6d0 drivers/base/platform.c:597
platform_device_register_full+0x38c/0x4e0 drivers/base/platform.c:720
platform_device_register_resndata include/linux/platform_device.h:131 [inline]
platform_device_register_simple include/linux/platform_device.h:160 [inline]
alsa_card_dummy_init+0x1cc/0x2e0 sound/drivers/dummy.c:1168
do_one_initcall+0x10a/0x7b0 init/main.c:1204
do_initcall_level init/main.c:1277 [inline]
do_initcalls init/main.c:1293 [inline]
do_basic_setup init/main.c:1313 [inline]
kernel_init_freeable+0x5e9/0x66d init/main.c:1512
kernel_init+0xd/0x1c0 init/main.c:1402
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
INITIAL USE at:
lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5398
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
snd_ctl_notify.part.0+0x36/0x550 sound/core/control.c:153
snd_ctl_notify+0x8f/0xb0 sound/core/control.c:181
__snd_ctl_add_replace+0x638/0x800 sound/core/control.c:382
snd_ctl_add_replace+0x76/0x130 sound/core/control.c:399
snd_card_dummy_new_mixer sound/drivers/dummy.c:885 [inline]
snd_dummy_probe+0xbbf/0x1050 sound/drivers/dummy.c:1080
platform_drv_probe+0x87/0x140 drivers/base/platform.c:747
really_probe+0x282/0x9f0 drivers/base/dd.c:553
driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:738
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:844
bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
__device_attach+0x228/0x470 drivers/base/dd.c:912
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
device_add+0xb17/0x1c40 drivers/base/core.c:2926
platform_device_add+0x34f/0x6d0 drivers/base/platform.c:597
platform_device_register_full+0x38c/0x4e0 drivers/base/platform.c:720
platform_device_register_resndata include/linux/platform_device.h:131 [inline]
platform_device_register_simple include/linux/platform_device.h:160 [inline]
alsa_card_dummy_init+0x1cc/0x2e0 sound/drivers/dummy.c:1168
do_one_initcall+0x10a/0x7b0 init/main.c:1204
do_initcall_level init/main.c:1277 [inline]
do_initcalls init/main.c:1293 [inline]
do_basic_setup init/main.c:1313 [inline]
kernel_init_freeable+0x5e9/0x66d init/main.c:1512
kernel_init+0xd/0x1c0 init/main.c:1402
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
(null) at:
general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 PID: 8556 Comm: syz-executor.3 Not tainted 5.9.0-rc4-next-20200908-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:print_lock_trace kernel/locking/lockdep.c:1751 [inline]
RIP: 0010:print_lock_class_header kernel/locking/lockdep.c:2240 [inline]
RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af kernel/locking/lockdep.c:2263
Code: 48 8b 04 24 48 c1 e8 03 42 80 3c 20 00 74 09 48 8b 3c 24 e8 dd fb de f9 48 8b 04 24 48 8b 00 48 8d 78 14 48 89 fa 48 c1 ea 03 <42> 0f b6 0c 22 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85
RSP: 0018:ffffc900056f73a0 EFLAGS: 00010003
RAX: 0000000000000001 RBX: ffffc900056f7558 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff815bc817 RDI: 0000000000000015
RBP: ffffc900056f7558 R08: 0000000000000004 R09: ffff8880ae620f8b
R10: 0000000000000000 R11: 6c6c756e28202020 R12: dffffc0000000000
R13: ffffffff8c6de340 R14: 0000000000000009 R15: 0000000000000000
FS: 00007f3778278700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33223000 CR3: 00000000a78fa000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
print_bad_irq_dependency kernel/locking/lockdep.c:2402 [inline]
check_irq_usage.cold+0x46b/0x5b0 kernel/locking/lockdep.c:2634
check_prev_add kernel/locking/lockdep.c:2823 [inline]
check_prevs_add kernel/locking/lockdep.c:2944 [inline]
validate_chain kernel/locking/lockdep.c:3562 [inline]
__lock_acquire+0x2800/0x55d0 kernel/locking/lockdep.c:4796
lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5398
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
snd_ctl_notify.part.0+0x36/0x550 sound/core/control.c:153
snd_ctl_notify+0x8f/0xb0 sound/core/control.c:181
loopback_check_format sound/drivers/aloop.c:358 [inline]
loopback_trigger+0x10df/0x1990 sound/drivers/aloop.c:387
snd_pcm_do_start sound/core/pcm_native.c:1350 [inline]
snd_pcm_do_start+0xb1/0xf0 sound/core/pcm_native.c:1345
snd_pcm_action_single sound/core/pcm_native.c:1207 [inline]
snd_pcm_action+0xc8/0x170 sound/core/pcm_native.c:1290
__snd_pcm_lib_xfer+0x1202/0x1a90 sound/core/pcm_lib.c:2247
snd_pcm_oss_write3+0x107/0x320 sound/core/oss/pcm_oss.c:1221
io_playback_transfer+0x27e/0x330 sound/core/oss/io.c:47
snd_pcm_plug_write_transfer+0x2cd/0x3f0 sound/core/oss/pcm_plugin.c:624
snd_pcm_oss_write2+0x245/0x3f0 sound/core/oss/pcm_oss.c:1353
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1419 [inline]
snd_pcm_oss_write+0x705/0x940 sound/core/oss/pcm_oss.c:2765
vfs_write+0x28e/0x700 fs/read_write.c:593
ksys_write+0x12d/0x250 fs/read_write.c:648
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3778277c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000038f40 RCX: 000000000045d5b9
RDX: 0000000000000080 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffe90897b0f R14: 00007f37782789c0 R15: 000000000118cf4c
Modules linked in:
---[ end trace f8fb172cba9857a8 ]---
RIP: 0010:print_lock_trace kernel/locking/lockdep.c:1751 [inline]
RIP: 0010:print_lock_class_header kernel/locking/lockdep.c:2240 [inline]
RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af kernel/locking/lockdep.c:2263
Code: 48 8b 04 24 48 c1 e8 03 42 80 3c 20 00 74 09 48 8b 3c 24 e8 dd fb de f9 48 8b 04 24 48 8b 00 48 8d 78 14 48 89 fa 48 c1 ea 03 <42> 0f b6 0c 22 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85
RSP: 0018:ffffc900056f73a0 EFLAGS: 00010003
RAX: 0000000000000001 RBX: ffffc900056f7558 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff815bc817 RDI: 0000000000000015
RBP: ffffc900056f7558 R08: 0000000000000004 R09: ffff8880ae620f8b
R10: 0000000000000000 R11: 6c6c756e28202020 R12: dffffc0000000000
R13: ffffffff8c6de340 R14: 0000000000000009 R15: 0000000000000000
FS: 00007f3778278700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33223000 CR3: 00000000a78fa000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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