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* [alsa-devel] INFO: task hung in snd_timer_close
@ 2019-11-05 17:52 syzbot
  2019-11-06 12:05 ` syzbot
  0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2019-11-05 17:52 UTC (permalink / raw)
  To: alexandre.belloni, alsa-devel, bhelgaas, kirr, linux-kernel,
	lkundrak, perex, syzkaller-bugs, tglx, tiwai

Hello,

syzbot found the following crash on:

HEAD commit:    a99d8080 Linux 5.4-rc6
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10afae68e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5e2eca3f31f9bf
dashboard link: https://syzkaller.appspot.com/bug?extid=f1048ebddb93befb085f
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=126bc658e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f1048ebddb93befb085f@syzkaller.appspotmail.com

INFO: task syz-executor.0:12251 blocked for more than 143 seconds.
       Not tainted 5.4.0-rc6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D28160 12251   8868 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3384 [inline]
  __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
  schedule+0xd9/0x260 kernel/sched/core.c:4136
  schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
  __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
  __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
  snd_timer_close+0x7e/0x100 sound/core/timer.c:422
  snd_timer_user_release+0x98/0x130 sound/core/timer.c:1478
  __fput+0x2ff/0x890 fs/file_table.c:280
  ____fput+0x16/0x20 fs/file_table.c:313
  task_work_run+0x145/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413db1
Code: c0 c3 0f 1f 80 00 00 00 00 c7 07 00 00 00 00 31 c0 c3 0f 1f 80 00 00  
00 00 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 b8 <2d> f8 ff ff c3  
66 2e 0f 1f 84 00 00 00 00 00 31 c0 c3 66 66 66 66
RSP: 002b:00007ffdda4a34b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413db1
RDX: 0000001b2dd20000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffdda4a3590 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000760a90 R15: 000000000075bf2c
INFO: task syz-executor.2:12256 blocked for more than 143 seconds.
       Not tainted 5.4.0-rc6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D28160 12256   8864 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3384 [inline]
  __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
  schedule+0xd9/0x260 kernel/sched/core.c:4136
  schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
  __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
  __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
  snd_timer_close+0x7e/0x100 sound/core/timer.c:422
  snd_timer_user_release+0x98/0x130 sound/core/timer.c:1478
  __fput+0x2ff/0x890 fs/file_table.c:280
  ____fput+0x16/0x20 fs/file_table.c:313
  task_work_run+0x145/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413db1
Code: c0 c3 0f 1f 80 00 00 00 00 c7 07 00 00 00 00 31 c0 c3 0f 1f 80 00 00  
00 00 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 b8 <2d> f8 ff ff c3  
66 2e 0f 1f 84 00 00 00 00 00 31 c0 c3 66 66 66 66
RSP: 002b:00007ffe078ed7d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413db1
RDX: 0000001b2da20000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffe078ed8b0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000760a90 R15: 000000000075bf2c
INFO: task syz-executor.4:12266 blocked for more than 144 seconds.
       Not tainted 5.4.0-rc6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28480 12266   8871 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3384 [inline]
  __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
  schedule+0xd9/0x260 kernel/sched/core.c:4136
  schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
  __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
  __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
  snd_timer_open+0x98/0x1860 sound/core/timer.c:245
  snd_timer_user_tselect sound/core/timer.c:1728 [inline]
  __snd_timer_user_ioctl.isra.0+0x68b/0x1fd0 sound/core/timer.c:2003
  snd_timer_user_ioctl+0x7a/0xa7 sound/core/timer.c:2033
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: Bad RIP value.
RSP: 002b:00007f2806975c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219
RDX: 0000000020029fcc RSI: 0000000040345410 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f28069766d4
R13: 00000000004cf428 R14: 00000000004d9760 R15: 00000000ffffffff
INFO: task syz-executor.4:12269 blocked for more than 144 seconds.
       Not tainted 5.4.0-rc6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D29712 12269   8871 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3384 [inline]
  __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
  schedule+0xd9/0x260 kernel/sched/core.c:4136
  schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
  __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
  __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
  snd_timer_user_ioctl+0x51/0xa7 sound/core/timer.c:2032
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: Bad RIP value.
RSP: 002b:00007f2806954c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045a219
RDX: 0000000000000000 RSI: 00000000000054a0 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f28069556d4
R13: 00000000004c4ae8 R14: 00000000004d9778 R15: 00000000ffffffff
INFO: task syz-executor.4:12271 blocked for more than 144 seconds.
       Not tainted 5.4.0-rc6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28000 12271   8871 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3384 [inline]
  __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
  schedule+0xd9/0x260 kernel/sched/core.c:4136
  schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
  __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
  __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
  snd_timer_open+0x98/0x1860 sound/core/timer.c:245
  snd_seq_timer_open+0x240/0x590 sound/core/seq/seq_timer.c:275
  queue_use+0xf1/0x270 sound/core/seq/seq_queue.c:489
  snd_seq_queue_alloc+0x2c5/0x4d0 sound/core/seq/seq_queue.c:176
  snd_seq_ioctl_create_queue+0xb0/0x330 sound/core/seq/seq_clientmgr.c:1548
  snd_seq_kernel_client_ctl+0xf8/0x140 sound/core/seq/seq_clientmgr.c:2353
  alloc_seq_queue.isra.0+0xdc/0x180 sound/core/seq/oss/seq_oss_init.c:357
  snd_seq_oss_open+0x2ff/0x960 sound/core/seq/oss/seq_oss_init.c:215
  odev_open+0x70/0x90 sound/core/seq/oss/seq_oss.c:125
  soundcore_open+0x453/0x610 sound/sound_core.c:593
  chrdev_open+0x245/0x6b0 fs/char_dev.c:414
  do_dentry_open+0x4e6/0x1380 fs/open.c:797
  vfs_open+0xa0/0xd0 fs/open.c:914
  do_last fs/namei.c:3408 [inline]
  path_openat+0x10e9/0x46d0 fs/namei.c:3525
  do_filp_open+0x1a1/0x280 fs/namei.c:3555
  do_sys_open+0x3fe/0x5d0 fs/open.c:1097
  __do_sys_openat fs/open.c:1124 [inline]
  __se_sys_openat fs/open.c:1118 [inline]
  __x64_sys_openat+0x9d/0x100 fs/open.c:1118
  do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: Bad RIP value.
RSP: 002b:00007f2806933c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a219
RDX: 0000000000000001 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f28069346d4
R13: 00000000004c734a R14: 00000000004dcf88 R15: 00000000ffffffff
INFO: task syz-executor.4:12273 blocked for more than 145 seconds.
       Not tainted 5.4.0-rc6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28552 12273   8871 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3384 [inline]
  __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
  schedule+0xd9/0x260 kernel/sched/core.c:4136
  schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
  __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
  __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
  snd_timer_user_ioctl+0x51/0xa7 sound/core/timer.c:2032
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: Bad RIP value.
RSP: 002b:00007f2806912c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045a219
RDX: 0000000000000000 RSI: 00000000000054a0 RDI: 0000000000000003
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f28069136d4
R13: 00000000004c4ae8 R14: 00000000004d9778 R15: 00000000ffffffff
INFO: task syz-executor.4:12275 blocked for more than 145 seconds.
       Not tainted 5.4.0-rc6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D29312 12275   8871 0x00004004
Call Trace:
  context_switch kernel/sched/core.c:3384 [inline]
  __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
  schedule+0xd9/0x260 kernel/sched/core.c:4136
  schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
  __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
  __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
  snd_timer_open+0x98/0x1860 sound/core/timer.c:245
  snd_timer_user_tselect sound/core/timer.c:1728 [inline]
  __snd_timer_user_ioctl.isra.0+0x68b/0x1fd0 sound/core/timer.c:2003
  snd_timer_user_ioctl+0x7a/0xa7 sound/core/timer.c:2033
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: Bad RIP value.
RSP: 002b:00007f28068f1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219
RDX: 0000000020029fcc RSI: 0000000040345410 RDI: 0000000000000003
RBP: 000000000075c1c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f28068f26d4
R13: 00000000004cf428 R14: 00000000004d9760 R15: 00000000ffffffff
INFO: task syz-executor.4:12276 blocked for more than 146 seconds.
       Not tainted 5.4.0-rc6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28536 12276   8871 0x00004004
Call Trace:
  context_switch kernel/sched/core.c:3384 [inline]
  __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
  schedule+0xd9/0x260 kernel/sched/core.c:4136
  schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
  __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
  __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
  odev_open+0x5f/0x90 sound/core/seq/oss/seq_oss.c:124
  soundcore_open+0x453/0x610 sound/sound_core.c:593
  chrdev_open+0x245/0x6b0 fs/char_dev.c:414
  do_dentry_open+0x4e6/0x1380 fs/open.c:797
  vfs_open+0xa0/0xd0 fs/open.c:914
  do_last fs/namei.c:3408 [inline]
  path_openat+0x10e9/0x46d0 fs/namei.c:3525
  do_filp_open+0x1a1/0x280 fs/namei.c:3555
  do_sys_open+0x3fe/0x5d0 fs/open.c:1097
  __do_sys_openat fs/open.c:1124 [inline]
  __se_sys_openat fs/open.c:1118 [inline]
  __x64_sys_openat+0x9d/0x100 fs/open.c:1118
  do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: Bad RIP value.
RSP: 002b:00007f28068d0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a219
RDX: 0000000000000001 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 000000000075c268 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f28068d16d4
R13: 00000000004c734a R14: 00000000004dcf88 R15: 00000000ffffffff
INFO: task syz-executor.1:12261 blocked for more than 146 seconds.
       Not tainted 5.4.0-rc6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D28160 12261   8866 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3384 [inline]
  __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
  schedule+0xd9/0x260 kernel/sched/core.c:4136
  schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
  __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
  __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
  snd_timer_close+0x7e/0x100 sound/core/timer.c:422
  snd_timer_user_release+0x98/0x130 sound/core/timer.c:1478
  __fput+0x2ff/0x890 fs/file_table.c:280
  ____fput+0x16/0x20 fs/file_table.c:313
  task_work_run+0x145/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413db1
Code: c0 c3 0f 1f 80 00 00 00 00 c7 07 00 00 00 00 31 c0 c3 0f 1f 80 00 00  
00 00 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 b8 <2d> f8 ff ff c3  
66 2e 0f 1f 84 00 00 00 00 00 31 c0 c3 66 66 66 66
RSP: 002b:00007ffe3503b380 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413db1
RDX: 0000001b2db20000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffe3503b460 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000760a90 R15: 000000000075bf2c
INFO: task syz-executor.5:12267 blocked for more than 147 seconds.
       Not tainted 5.4.0-rc6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D28552 12267   8870 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3384 [inline]
  __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
  schedule+0xd9/0x260 kernel/sched/core.c:4136
  schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
  __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
  __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
  snd_timer_open+0x98/0x1860 sound/core/timer.c:245
  snd_timer_user_tselect sound/core/timer.c:1728 [inline]
  __snd_timer_user_ioctl.isra.0+0x68b/0x1fd0 sound/core/timer.c:2003
  snd_timer_user_ioctl+0x7a/0xa7 sound/core/timer.c:2033
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: Bad RIP value.
RSP: 002b:00007ff76c742c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219
RDX: 0000000020029fcc RSI: 0000000040345410 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff76c7436d4
R13: 00000000004cf428 R14: 00000000004d9760 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1070:
  #0: ffffffff88fab340 (rcu_read_lock){....}, at:  
debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5337
1 lock held by rsyslogd/8724:
  #0: ffff88809ae4bd60 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110  
fs/file.c:801
2 locks held by getty/8813:
  #0: ffff8880a459b090 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
  #1: ffffc90005f152e0 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8814:
  #0: ffff8880a9021090 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
  #1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8815:
  #0: ffff8880a818a090 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
  #1: ffffc90005f192e0 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8816:
  #0: ffff8880a843a090 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
  #1: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8817:
  #0: ffff8880a2834090 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
  #1: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8818:
  #0: ffff88809aafe090 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
  #1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8819:
  #0: ffff8880a514a090 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
  #1: ffffc90005ef12e0 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.3/12245:
2 locks held by syz-executor.0/12251:
  #0: ffff888082e84550 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_release+0x67/0x130 sound/core/timer.c:1476
  #1: ffffffff89914b00 (register_mutex){+.+.}, at:  
snd_timer_close+0x7e/0x100 sound/core/timer.c:422
2 locks held by syz-executor.2/12256:
  #0: ffff88809c005150 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_release+0x67/0x130 sound/core/timer.c:1476
  #1: ffffffff89914b00 (register_mutex){+.+.}, at:  
snd_timer_close+0x7e/0x100 sound/core/timer.c:422
2 locks held by syz-executor.4/12266:
  #0: ffff8880a9b93950 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_ioctl+0x51/0xa7 sound/core/timer.c:2032
  #1: ffffffff89914b00 (register_mutex){+.+.}, at:  
snd_timer_open+0x98/0x1860 sound/core/timer.c:245
1 lock held by syz-executor.4/12269:
  #0: ffff8880a9b93950 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_ioctl+0x51/0xa7 sound/core/timer.c:2032
2 locks held by syz-executor.4/12271:
  #0: ffffffff89924320 (register_mutex#4){+.+.}, at: odev_open+0x5f/0x90  
sound/core/seq/oss/seq_oss.c:124
  #1: ffffffff89914b00 (register_mutex){+.+.}, at:  
snd_timer_open+0x98/0x1860 sound/core/timer.c:245
1 lock held by syz-executor.4/12273:
  #0: ffff888096c8d550 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_ioctl+0x51/0xa7 sound/core/timer.c:2032
2 locks held by syz-executor.4/12275:
  #0: ffff888096c8d550 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_ioctl+0x51/0xa7 sound/core/timer.c:2032
  #1: ffffffff89914b00 (register_mutex){+.+.}, at:  
snd_timer_open+0x98/0x1860 sound/core/timer.c:245
1 lock held by syz-executor.4/12276:
  #0: ffffffff89924320 (register_mutex#4){+.+.}, at: odev_open+0x5f/0x90  
sound/core/seq/oss/seq_oss.c:124
2 locks held by syz-executor.1/12261:
  #0: ffff88809a826950 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_release+0x67/0x130 sound/core/timer.c:1476
  #1: ffffffff89914b00 (register_mutex){+.+.}, at:  
snd_timer_close+0x7e/0x100 sound/core/timer.c:422
2 locks held by syz-executor.5/12267:
  #0: ffff8880970f0950 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_ioctl+0x51/0xa7 sound/core/timer.c:2032
  #1: ffffffff89914b00 (register_mutex){+.+.}, at:  
snd_timer_open+0x98/0x1860 sound/core/timer.c:245
1 lock held by syz-executor.5/12270:
  #0: ffff8880970f0950 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_ioctl+0x51/0xa7 sound/core/timer.c:2032
1 lock held by syz-executor.5/12272:
  #0: ffffffff89924320 (register_mutex#4){+.+.}, at: odev_open+0x5f/0x90  
sound/core/seq/oss/seq_oss.c:124
1 lock held by syz-executor.5/12274:
  #0: ffff8880a0113d50 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_ioctl+0x51/0xa7 sound/core/timer.c:2032
2 locks held by syz-executor.5/12277:
  #0: ffff8880a0113d50 (&tu->ioctl_lock){+.+.}, at:  
snd_timer_user_ioctl+0x51/0xa7 sound/core/timer.c:2032
  #1: ffffffff89914b00 (register_mutex){+.+.}, at:  
snd_timer_open+0x98/0x1860 sound/core/timer.c:245
1 lock held by syz-executor.5/12279:
  #0: ffffffff89924320 (register_mutex#4){+.+.}, at: odev_open+0x5f/0x90  
sound/core/seq/oss/seq_oss.c:124

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1070 Comm: khungtaskd Not tainted 5.4.0-rc6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x172/0x1f0 lib/dump_stack.c:113
  nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
  nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
  arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
  trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
  check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
  watchdog+0x9d0/0xef0 kernel/hung_task.c:289
  kthread+0x361/0x430 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12245 Comm: syz-executor.3 Not tainted 5.4.0-rc6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:236 [inline]
RIP: 0010:delay_tsc+0x4a/0xc0 arch/x86/lib/delay.c:61
Code: 0f 01 f9 66 90 48 c1 e2 20 48 09 c2 49 89 d4 eb 16 f3 90 bf 01 00 00  
00 e8 03 c2 01 fa e8 de cd f9 fb 44 39 e8 75 36 0f 01 f9 <66> 90 48 c1 e2  
20 48 89 d3 48 09 c3 48 89 d8 4c 29 e0 4c 39 f0 73
RSP: 0018:ffff88808034fc70 EFLAGS: 00000246
RAX: 000000004e0d2263 RBX: 000002d24e0d2178 RCX: 0000000000000000
RDX: 00000000000002d2 RSI: ffffffff8347345c RDI: 0000000000000005
RBP: ffff88808034fc90 R08: ffff8880998302c0 R09: fffffbfff14efd42
R10: fffffbfff14efd41 R11: ffffffff8a77ea0f R12: 000002d24e0d173d
R13: 0000000000000000 R14: 00000000000059d9 R15: ffff88809ccb0108
FS:  0000000000fa4940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 0000000095a99000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  __delay arch/x86/lib/delay.c:161 [inline]
  __const_udelay+0x59/0x80 arch/x86/lib/delay.c:175
  snd_timer_close_locked+0x22a/0xda0 sound/core/timer.c:369
  snd_timer_close+0x8a/0x100 sound/core/timer.c:423
  snd_timer_user_release+0x98/0x130 sound/core/timer.c:1478
  __fput+0x2ff/0x890 fs/file_table.c:280
  ____fput+0x16/0x20 fs/file_table.c:313
  task_work_run+0x145/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413db1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48  
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48  
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff58da8ec0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413db1
RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000760a88 R09: ffffffffffffffff
R10: 00007fff58da8f90 R11: 0000000000000293 R12: 000000000075bf20
R13: 0000000000000003 R14: 0000000000760a90 R15: 000000000075bf2c


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
_______________________________________________
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^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [alsa-devel] INFO: task hung in snd_timer_close
  2019-11-05 17:52 [alsa-devel] INFO: task hung in snd_timer_close syzbot
@ 2019-11-06 12:05 ` syzbot
  2019-11-06 12:13   ` Mark Brown
  0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2019-11-06 12:05 UTC (permalink / raw)
  To: alexandre.belloni, alsa-devel-owner, alsa-devel, bhelgaas,
	broonie, kirr, linux-kernel, linux, lkundrak, maxime.ripard,
	perex, peron.clem, robh, syzkaller-bugs, tglx, tiwai, tiwai

syzbot has bisected this bug to:

commit b2045303147254d01b1db90a83e5df3832c4264b
Author: Clément Péron <peron.clem@gmail.com>
Date:   Mon May 27 20:06:21 2019 +0000

     dt-bindings: sound: sun4i-spdif: Add Allwinner H6 compatible

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14acecb4e00000
start commit:   a99d8080 Linux 5.4-rc6
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=16acecb4e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12acecb4e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5e2eca3f31f9bf
dashboard link: https://syzkaller.appspot.com/bug?extid=f1048ebddb93befb085f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=126bc658e00000

Reported-by: syzbot+f1048ebddb93befb085f@syzkaller.appspotmail.com
Fixes: b20453031472 ("dt-bindings: sound: sun4i-spdif: Add Allwinner H6  
compatible")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [alsa-devel] INFO: task hung in snd_timer_close
  2019-11-06 12:05 ` syzbot
@ 2019-11-06 12:13   ` Mark Brown
  0 siblings, 0 replies; 3+ messages in thread
From: Mark Brown @ 2019-11-06 12:13 UTC (permalink / raw)
  To: syzbot
  Cc: robh, alexandre.belloni, alsa-devel, maxime.ripard, tiwai,
	syzkaller-bugs, linux-kernel, alsa-devel-owner, lkundrak,
	peron.clem, tiwai, bhelgaas, tglx, kirr, linux

[-- Attachment #1.1: Type: text/plain, Size: 482 bytes --]

On Wed, Nov 06, 2019 at 04:05:00AM -0800, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit b2045303147254d01b1db90a83e5df3832c4264b
> Author: Clément Péron <peron.clem@gmail.com>
> Date:   Mon May 27 20:06:21 2019 +0000
> 
>     dt-bindings: sound: sun4i-spdif: Add Allwinner H6 compatible
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14acecb4e00000
> start commit:   a99d8080 Linux 5.4-rc6

This bisection is clearly a false positive.

[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

[-- Attachment #2: Type: text/plain, Size: 161 bytes --]

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, back to index

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-11-05 17:52 [alsa-devel] INFO: task hung in snd_timer_close syzbot
2019-11-06 12:05 ` syzbot
2019-11-06 12:13   ` Mark Brown

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