Re: INFO: task hung in vivid_stop_generating_vid_cap
syzbot has bisected this bug to:
commit f2fe89061d79706eca5c47e4efdc09bbc171e74a
Author: Helen Koike
Date: Fri Apr 7 17:55:19 2017 +
[media] vimc: Virtual Media Controller core, capture and sensor
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12ea247d20
start commit: 9f51ae62 Merge git://git.kernel.org/pub/scm/linux/kernel/g..
git tree: upstream
final crash:https://syzkaller.appspot.com/x/report.txt?x=11ea247d20
console output: https://syzkaller.appspot.com/x/log.txt?x=16ea247d20
kernel config: https://syzkaller.appspot.com/x/.config?x=62118286bb772a24
dashboard link: https://syzkaller.appspot.com/bug?extid=06283a66a648cd073885
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15701a3340
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=154c8e4d40
Reported-by: syzbot+06283a66a648cd073...@syzkaller.appspotmail.com
Fixes: f2fe89061d79 ("[media] vimc: Virtual Media Controller core, capture
and sensor")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
Re: INFO: task hung in vivid_stop_generating_vid_cap
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=14bfad7b40 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=15701a3340 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=154c8e4d40 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+06283a66a648cd073...@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 0x0004 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:7ffc53169f28 EFLAGS: 0246 ORIG_RAX: 0003 RAX: RBX: 0003 RCX: 00400f00 RDX: 00d6 RSI: 2140 RDI: 0003 RBP: R08: 024b1880 R09: 004002e0 R10: R11: 0246 R12: 00401e10 R13: 00401ea0 R14: R15: 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 0x0004 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
Re: INFO: task hung in vivid_stop_generating_vid_cap
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=14bfad7b40 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=15701a3340 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=154c8e4d40 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+06283a66a648cd073...@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 0x0004 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:7ffc53169f28 EFLAGS: 0246 ORIG_RAX: 0003 RAX: RBX: 0003 RCX: 00400f00 RDX: 00d6 RSI: 2140 RDI: 0003 RBP: R08: 024b1880 R09: 004002e0 R10: R11: 0246 R12: 00401e10 R13: 00401ea0 R14: R15: 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 0x0004 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
