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SubjectRe: INFO: task hung in vivid_stop_generating_vid_cap
From
syzbot has found a reproducer for the following crash on:

HEAD commit: 9f51ae62c84a Merge git://git.kernel.org/pub/scm/linux/kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14bfad7b400000
kernel config: https://syzkaller.appspot.com/x/.config?x=62118286bb772a24
dashboard link: https://syzkaller.appspot.com/bug?extid=06283a66a648cd073885
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15701a33400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=154c8e4d400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+06283a66a648cd073885@syzkaller.appspotmail.com

INFO: task syz-executor686:5724 blocked for more than 140 seconds.
Not tainted 4.19.0+ #309
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor686 D24208 5724 5716 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2831 [inline]
__schedule+0x8cf/0x21d0 kernel/sched/core.c:3480
schedule+0xfe/0x460 kernel/sched/core.c:3524
schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1780
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x427/0x8a0 kernel/sched/completion.c:136
kthread_stop+0x1a9/0x900 kernel/kthread.c:550
vivid_stop_generating_vid_cap+0x2bc/0x93b
drivers/media/platform/vivid/vivid-kthread-cap.c:919
vid_cap_stop_streaming+0x8d/0xe0
drivers/media/platform/vivid/vivid-vid-cap.c:256
__vb2_queue_cancel+0x171/0xca0
drivers/media/common/videobuf2/videobuf2-core.c:1659
vb2_core_streamoff+0x60/0x140
drivers/media/common/videobuf2/videobuf2-core.c:1795
__vb2_cleanup_fileio+0x73/0x160
drivers/media/common/videobuf2/videobuf2-core.c:2316
vb2_core_queue_release+0x1e/0x80
drivers/media/common/videobuf2/videobuf2-core.c:2043
vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:672
[inline]
_vb2_fop_release+0x1d2/0x2b0
drivers/media/common/videobuf2/videobuf2-v4l2.c:843
vb2_fop_release+0x77/0xc0
drivers/media/common/videobuf2/videobuf2-v4l2.c:857
vivid_fop_release+0x18e/0x440 drivers/media/platform/vivid/vivid-core.c:474
v4l2_release+0xfb/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:448
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x400f00
Code: 00 00 00 00 00 00 00 00 00 00 d6 01 00 00 12 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 03 00 00 12 00 00 00 <00> 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 b8 02 00 00 12 00
RSP: 002b:00007ffc53169f28 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400f00
RDX: 00000000000000d6 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00000000024b1880 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401e10
R13: 0000000000401ea0 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor686:5730 blocked for more than 140 seconds.
Not tainted 4.19.0+ #309
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor686 D24208 5730 5721 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2831 [inline]
__schedule+0x8cf/0x21d0 kernel/sched/core.c:3480
schedule+0xfe/0x460 kernel/sched/core.c:3524
schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1780
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x427/0x8a0 kernel/sched/completion.c:136
kthread_stop+0x1a9/0x900 kernel/kthread.c:550
vivid_stop_generating_vid_cap+0x2bc/0x93b
drivers/media/platform/vivid/vivid-kthread-cap.c:919
vid_cap_stop_streaming+0x8d/0xe0
drivers/media/platform/vivid/vivid-vid-cap.c:256
__vb2_queue_cancel+0x171/0xca0
drivers/media/common/videobuf2/videobuf2-core.c:1659
vb2_core_streamoff+0x60/0x140
drivers/media/common/videobuf2/videobuf2-core.c:1795
__vb2_cleanup_fileio+0x73/0x160
drivers/media/common/videobuf2/videobuf2-core.c:2316
vb2_core_queue_release+0x1e/0x80
drivers/media/common/videobuf2/videobuf2-core.c:2043
vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:672
[inline]
_vb2_fop_release+0x1d2/0x2b0
drivers/media/common/videobuf2/videobuf2-v4l2.c:843
vb2_fop_release+0x77/0xc0
drivers/media/common/videobuf2/videobuf2-v4l2.c:857
vivid_fop_release+0x18e/0x440 drivers/media/platform/vivid/vivid-core.c:474
v4l2_release+0xfb/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:448
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x400f00
Code: 00 00 00 00 00 00 00 00 00 00 d6 01 00 00 12 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 03 00 00 12 00 00 00 <00> 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 b8 02 00 00 12 00
RSP: 002b:00007ffc53169f28 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400f00
RDX: 00000000000000d6 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00000000024b1880 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000003fbb5
R13: 0000000000401ea0 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor686:5734 blocked for more than 140 seconds.
Not tainted 4.19.0+ #309
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor686 D21848 5734 5720 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2831 [inline]
__schedule+0x8cf/0x21d0 kernel/sched/core.c:3480
schedule+0xfe/0x460 kernel/sched/core.c:3524
schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1780
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x427/0x8a0 kernel/sched/completion.c:136
kthread_stop+0x1a9/0x900 kernel/kthread.c:550
vivid_stop_generating_vid_cap+0x2bc/0x93b
drivers/media/platform/vivid/vivid-kthread-cap.c:919
vid_cap_stop_streaming+0x8d/0xe0
drivers/media/platform/vivid/vivid-vid-cap.c:256
__vb2_queue_cancel+0x171/0xca0
drivers/media/common/videobuf2/videobuf2-core.c:1659
vb2_core_streamoff+0x60/0x140
drivers/media/common/videobuf2/videobuf2-core.c:1795
__vb2_cleanup_fileio+0x73/0x160
drivers/media/common/videobuf2/videobuf2-core.c:2316
vb2_core_queue_release+0x1e/0x80
drivers/media/common/videobuf2/videobuf2-core.c:2043
vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:672
[inline]
_vb2_fop_release+0x1d2/0x2b0
drivers/media/common/videobuf2/videobuf2-v4l2.c:843
vb2_fop_release+0x77/0xc0
drivers/media/common/videobuf2/videobuf2-v4l2.c:857
vivid_fop_release+0x18e/0x440 drivers/media/platform/vivid/vivid-core.c:474
v4l2_release+0xfb/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:448
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x400f00
Code: 00 00 00 00 00 00 a8 01 00 00 00 00 00 00 36 01 00 00 b5 00 00 00 01
02 00 00 00 00 00 00 00 00 00 00 6a 01 00 00 00 00 00 00 <00> 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 002b:00007ffc53169f28 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400f00
RDX: 00000000000000d6 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00000000024b1880 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000003fbc6
R13: 0000000000401ea0 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor686:5881 blocked for more than 140 seconds.
Not tainted 4.19.0+ #309
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor686 D24208 5881 5715 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2831 [inline]
__schedule+0x8cf/0x21d0 kernel/sched/core.c:3480
schedule+0xfe/0x460 kernel/sched/core.c:3524
schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1780
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x427/0x8a0 kernel/sched/completion.c:136
kthread_stop+0x1a9/0x900 kernel/kthread.c:550
vivid_stop_generating_vid_cap+0x2bc/0x93b
drivers/media/platform/vivid/vivid-kthread-cap.c:919
vid_cap_stop_streaming+0x8d/0xe0
drivers/media/platform/vivid/vivid-vid-cap.c:256
__vb2_queue_cancel+0x171/0xca0
drivers/media/common/videobuf2/videobuf2-core.c:1659
vb2_core_streamoff+0x60/0x140
drivers/media/common/videobuf2/videobuf2-core.c:1795
__vb2_cleanup_fileio+0x73/0x160
drivers/media/common/videobuf2/videobuf2-core.c:2316
vb2_core_queue_release+0x1e/0x80
drivers/media/common/videobuf2/videobuf2-core.c:2043
vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:672
[inline]
_vb2_fop_release+0x1d2/0x2b0
drivers/media/common/videobuf2/videobuf2-v4l2.c:843
vb2_fop_release+0x77/0xc0
drivers/media/common/videobuf2/videobuf2-v4l2.c:857
vivid_fop_release+0x18e/0x440 drivers/media/platform/vivid/vivid-core.c:474
v4l2_release+0xfb/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:448
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x400f00
Code: 00 00 00 00 00 00 a8 01 00 00 00 00 00 00 36 01 00 00 b5 00 00 00 01
02 00 00 00 00 00 00 00 00 00 00 6a 01 00 00 00 00 00 00 <00> 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 002b:00007ffc53169f28 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400f00
RDX: 00000000000000d6 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00000000024b1880 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000003fc9c
R13: 0000000000401ea0 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor686:5883 blocked for more than 140 seconds.
Not tainted 4.19.0+ #309
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor686 D24208 5883 5718 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2831 [inline]
__schedule+0x8cf/0x21d0 kernel/sched/core.c:3480
schedule+0xfe/0x460 kernel/sched/core.c:3524
schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1780
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x427/0x8a0 kernel/sched/completion.c:136
kthread_stop+0x1a9/0x900 kernel/kthread.c:550
vivid_stop_generating_vid_cap+0x2bc/0x93b
drivers/media/platform/vivid/vivid-kthread-cap.c:919
vid_cap_stop_streaming+0x8d/0xe0
drivers/media/platform/vivid/vivid-vid-cap.c:256
__vb2_queue_cancel+0x171/0xca0
drivers/media/common/videobuf2/videobuf2-core.c:1659
vb2_core_streamoff+0x60/0x140
drivers/media/common/videobuf2/videobuf2-core.c:1795
__vb2_cleanup_fileio+0x73/0x160
drivers/media/common/videobuf2/videobuf2-core.c:2316
vb2_core_queue_release+0x1e/0x80
drivers/media/common/videobuf2/videobuf2-core.c:2043
vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:672
[inline]
_vb2_fop_release+0x1d2/0x2b0
drivers/media/common/videobuf2/videobuf2-v4l2.c:843
vb2_fop_release+0x77/0xc0
drivers/media/common/videobuf2/videobuf2-v4l2.c:857
vivid_fop_release+0x18e/0x440 drivers/media/platform/vivid/vivid-core.c:474
v4l2_release+0xfb/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:448
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x400f00
Code: 00 00 00 00 00 00 a8 01 00 00 00 00 00 00 36 01 00 00 b5 00 00 00 01
02 00 00 00 00 00 00 00 00 00 00 6a 01 00 00 00 00 00 00 <00> 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 002b:00007ffc53169f28 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400f00
RDX: 00000000000000d6 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00000000024b1880 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000003fca0
R13: 0000000000401ea0 R14: 0000000000000000 R15: 0000000000000000

Showing all locks held in the system:
1 lock held by khungtaskd/1008:
#0: 00000000313d48c2 (rcu_read_lock){....}, at:
debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379
2 locks held by rsyslogd/5598:
#0: 00000000b3518de3 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200
fs/file.c:766
#1: 0000000038ba078b (logbuf_lock){-.-.}, at:
is_bpf_text_address+0x0/0x170 kernel/bpf/core.c:533
2 locks held by getty/5688:
#0: 0000000076b566f1 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000d605404c (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5689:
#0: 0000000001bbb883 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000bd2d67d2 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5690:
#0: 000000006d0f3ae6 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 0000000043ffd330 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5691:
#0: 000000007bbc59b2 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000002498a126 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5692:
#0: 000000007b579bf2 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000002e537c6f (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5693:
#0: 0000000034f4df10 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000d5e3a383 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5694:
#0: 00000000b9babf44 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 0000000080bdfa70 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140

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

NMI backtrace for cpu 1
CPU: 1 PID: 1008 Comm: khungtaskd Not tainted 4.19.0+ #309
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+0x244/0x39d lib/dump_stack.c:113
nmi_cpu_backtrace.cold.1+0x5c/0xa1 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b3/0x1ed 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:144 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
watchdog+0xb3e/0x1050 kernel/hung_task.c:265
kthread+0x35a/0x440 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:350
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10
arch/x86/include/asm/irqflags.h:57

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