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possible deadlock in v4l2_m2m_fop_poll

Status: auto-closed as invalid on 2019/06/03 23:57
Subsystems: media
[Documentation on labels]
Reported-by: syzbot+2178a0152e4d91ab271c@syzkaller.appspotmail.com
First crash: 1995d, last: 1968d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
possible deadlock in v4l2_m2m_fop_poll 0 (1) 2018/11/09 18:18

Sample crash report:
======================================================
WARNING: possible circular locking dependency detected
4.20.0-rc5+ #142 Not tainted
------------------------------------------------------
syz-executor0/28429 is trying to acquire lock:
00000000d59abe08 (&dev->dev_mutex){+.+.}, at: v4l2_m2m_fop_poll+0x98/0x120 drivers/media/v4l2-core/v4l2-mem2mem.c:1105

but task is already holding lock:
00000000f2cdaf57 (&ep->mtx){+.+.}, at: __do_sys_epoll_ctl fs/eventpoll.c:2085 [inline]
00000000f2cdaf57 (&ep->mtx){+.+.}, at: __se_sys_epoll_ctl fs/eventpoll.c:2007 [inline]
00000000f2cdaf57 (&ep->mtx){+.+.}, at: __x64_sys_epoll_ctl+0x7d4/0x1080 fs/eventpoll.c:2007

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #6 (&ep->mtx){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:925 [inline]
       __mutex_lock+0x166/0x16f0 kernel/locking/mutex.c:1072
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
       get_epoll_tfile_raw_ptr+0x96/0x1c0 fs/eventpoll.c:1103
       kcmp_epoll_target+0x356/0x580 kernel/kcmp.c:133
       __do_sys_kcmp kernel/kcmp.c:224 [inline]
       __se_sys_kcmp kernel/kcmp.c:152 [inline]
       __x64_sys_kcmp+0x813/0xa90 kernel/kcmp.c:152
       do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #5 (&sig->cred_guard_mutex){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:925 [inline]
       __mutex_lock+0x166/0x16f0 kernel/locking/mutex.c:1072
       mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1102
       lock_trace+0x4c/0xe0 fs/proc/base.c:384
       proc_pid_syscall+0xad/0x520 fs/proc/base.c:617
       proc_single_show+0x101/0x190 fs/proc/base.c:737
       seq_read+0x4af/0x1150 fs/seq_file.c:229
       do_loop_readv_writev fs/read_write.c:700 [inline]
       do_iter_read+0x4a3/0x650 fs/read_write.c:924
       vfs_readv+0x175/0x1c0 fs/read_write.c:986
       kernel_readv fs/splice.c:362 [inline]
       default_file_splice_read+0x539/0xb20 fs/splice.c:417
       do_splice_to+0x12e/0x190 fs/splice.c:880
       splice_direct_to_actor+0x270/0x8f0 fs/splice.c:952
       do_splice_direct+0x2d4/0x420 fs/splice.c:1061
       do_sendfile+0x62a/0xe20 fs/read_write.c:1439
       __do_sys_sendfile64 fs/read_write.c:1500 [inline]
       __se_sys_sendfile64 fs/read_write.c:1486 [inline]
       __x64_sys_sendfile64+0x1fd/0x250 fs/read_write.c:1486
       do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #4 (&p->lock){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:925 [inline]
       __mutex_lock+0x166/0x16f0 kernel/locking/mutex.c:1072
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
       seq_read+0x71/0x1150 fs/seq_file.c:161
       do_loop_readv_writev fs/read_write.c:700 [inline]
       do_iter_read+0x4a3/0x650 fs/read_write.c:924
       vfs_readv+0x175/0x1c0 fs/read_write.c:986
       kernel_readv fs/splice.c:362 [inline]
       default_file_splice_read+0x539/0xb20 fs/splice.c:417
       do_splice_to+0x12e/0x190 fs/splice.c:880
       splice_direct_to_actor+0x270/0x8f0 fs/splice.c:952
       do_splice_direct+0x2d4/0x420 fs/splice.c:1061
       do_sendfile+0x62a/0xe20 fs/read_write.c:1439
       __do_sys_sendfile64 fs/read_write.c:1500 [inline]
       __se_sys_sendfile64 fs/read_write.c:1486 [inline]
       __x64_sys_sendfile64+0x1fd/0x250 fs/read_write.c:1486
       do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #3 (sb_writers#6){.+.+}:
       percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
       percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
       __sb_start_write+0x214/0x370 fs/super.c:1387
       file_start_write include/linux/fs.h:2810 [inline]
       vfs_write+0x42a/0x560 fs/read_write.c:548
       kernel_write+0xab/0x120 fs/read_write.c:526
       p9_fd_write net/9p/trans_fd.c:439 [inline]
       p9_write_work+0x72b/0xdf0 net/9p/trans_fd.c:490
       process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153
       worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
       kthread+0x35a/0x440 kernel/kthread.c:246
       ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

-> #2 ((work_completion)(&m->wq)){+.+.}:
       process_one_work+0xc0a/0x1c40 kernel/workqueue.c:2129
       worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
       kthread+0x35a/0x440 kernel/kthread.c:246
       ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

-> #1 ((wq_completion)"events"){+.+.}:
       flush_workqueue+0x30a/0x1e10 kernel/workqueue.c:2655
       flush_scheduled_work include/linux/workqueue.h:599 [inline]
       vim2m_stop_streaming+0x7c/0x2c0 drivers/media/platform/vim2m.c:811
       __vb2_queue_cancel+0x171/0xd20 drivers/media/common/videobuf2/videobuf2-core.c:1823
       vb2_core_queue_release+0x26/0x80 drivers/media/common/videobuf2/videobuf2-core.c:2229
       vb2_queue_release+0x15/0x20 drivers/media/common/videobuf2/videobuf2-v4l2.c:837
       v4l2_m2m_ctx_release+0x1e/0x35 drivers/media/v4l2-core/v4l2-mem2mem.c:930
       vim2m_release+0xe6/0x150 drivers/media/platform/vim2m.c:977
       v4l2_release+0x224/0x3a0 drivers/media/v4l2-core/v4l2-dev.c:456
       __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

-> #0 (&dev->dev_mutex){+.+.}:
       lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844
       __mutex_lock_common kernel/locking/mutex.c:925 [inline]
       __mutex_lock+0x166/0x16f0 kernel/locking/mutex.c:1072
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
       v4l2_m2m_fop_poll+0x98/0x120 drivers/media/v4l2-core/v4l2-mem2mem.c:1105
       v4l2_poll+0x153/0x200 drivers/media/v4l2-core/v4l2-dev.c:350
       vfs_poll include/linux/poll.h:86 [inline]
       ep_item_poll.isra.15+0x15c/0x400 fs/eventpoll.c:892
       ep_insert+0x781/0x1dd0 fs/eventpoll.c:1464
       __do_sys_epoll_ctl fs/eventpoll.c:2121 [inline]
       __se_sys_epoll_ctl fs/eventpoll.c:2007 [inline]
       __x64_sys_epoll_ctl+0xeda/0x1080 fs/eventpoll.c:2007
       do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  &dev->dev_mutex --> &sig->cred_guard_mutex --> &ep->mtx

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ep->mtx);
                               lock(&sig->cred_guard_mutex);
                               lock(&ep->mtx);
  lock(&dev->dev_mutex);

 *** DEADLOCK ***

1 lock held by syz-executor0/28429:
 #0: 00000000f2cdaf57 (&ep->mtx){+.+.}, at: __do_sys_epoll_ctl fs/eventpoll.c:2085 [inline]
 #0: 00000000f2cdaf57 (&ep->mtx){+.+.}, at: __se_sys_epoll_ctl fs/eventpoll.c:2007 [inline]
 #0: 00000000f2cdaf57 (&ep->mtx){+.+.}, at: __x64_sys_epoll_ctl+0x7d4/0x1080 fs/eventpoll.c:2007

stack backtrace:
CPU: 1 PID: 28429 Comm: syz-executor0 Not tainted 4.20.0-rc5+ #142
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
 print_circular_bug.isra.35.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1221
 check_prev_add kernel/locking/lockdep.c:1863 [inline]
 check_prevs_add kernel/locking/lockdep.c:1976 [inline]
 validate_chain kernel/locking/lockdep.c:2347 [inline]
 __lock_acquire+0x3399/0x4c20 kernel/locking/lockdep.c:3341
 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844
 __mutex_lock_common kernel/locking/mutex.c:925 [inline]
 __mutex_lock+0x166/0x16f0 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 v4l2_m2m_fop_poll+0x98/0x120 drivers/media/v4l2-core/v4l2-mem2mem.c:1105
 v4l2_poll+0x153/0x200 drivers/media/v4l2-core/v4l2-dev.c:350
 vfs_poll include/linux/poll.h:86 [inline]
 ep_item_poll.isra.15+0x15c/0x400 fs/eventpoll.c:892
 ep_insert+0x781/0x1dd0 fs/eventpoll.c:1464
 __do_sys_epoll_ctl fs/eventpoll.c:2121 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2007 [inline]
 __x64_sys_epoll_ctl+0xeda/0x1080 fs/eventpoll.c:2007
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa077fd9c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457569
RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000040 R11: 0000000000000246 R12: 00007fa077fda6d4
R13: 00000000004bdc2c R14: 00000000004ccf78 R15: 00000000ffffffff
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'rx-0' (0000000028cda0dd): kobject_cleanup, parent 0000000047373e52
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'rx-0' (0000000028cda0dd): auto cleanup 'remove' event
kobject: 'rx-0' (0000000028cda0dd): kobject_uevent_env
kobject: 'rx-0' (0000000028cda0dd): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'rx-0' (0000000028cda0dd): auto cleanup kobject_del
kobject: 'loop3' (00000000acfa5bb9): kobject_uevent_env
kobject: 'rx-0' (0000000028cda0dd): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (00000000e1b84d89): kobject_cleanup, parent 0000000047373e52
kobject: 'loop3' (00000000acfa5bb9): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'tx-0' (00000000e1b84d89): auto cleanup 'remove' event
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'tx-0' (00000000e1b84d89): kobject_uevent_env
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'tx-0' (00000000e1b84d89): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'tx-0' (00000000e1b84d89): auto cleanup kobject_del
kobject: 'tx-0' (00000000e1b84d89): calling ktype release
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'tx-0': free name
kobject: 'queues' (0000000047373e52): kobject_cleanup, parent           (null)
kobject: 'queues' (0000000047373e52): calling ktype release
kobject: 'queues' (0000000047373e52): kset_release
kobject: 'queues': free name
kobject: 'erspan0' (000000003a965506): kobject_uevent_env
kobject: 'erspan0' (000000003a965506): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'ppp0' (00000000f9de0ebd): kobject_add_internal: parent: 'net', set: 'devices'
kobject: 'loop3' (00000000acfa5bb9): kobject_uevent_env
kobject: 'ppp0' (00000000f9de0ebd): kobject_uevent_env
kobject: 'loop3' (00000000acfa5bb9): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'ppp0' (00000000f9de0ebd): fill_kobj_path: path = '/devices/virtual/net/ppp0'
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'queues' (0000000062c4d851): kobject_add_internal: parent: 'ppp0', set: '<NULL>'
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'queues' (0000000062c4d851): kobject_uevent_env
kobject: 'queues' (0000000062c4d851): kobject_uevent_env: filter function caused the event to drop!
kobject: 'rx-0' (00000000758a0514): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'rx-0' (00000000758a0514): kobject_uevent_env
kobject: 'rx-0' (00000000758a0514): fill_kobj_path: path = '/devices/virtual/net/ppp0/queues/rx-0'
kobject: 'tx-0' (000000002d29845b): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'tx-0' (000000002d29845b): kobject_uevent_env
kobject: 'tx-0' (000000002d29845b): fill_kobj_path: path = '/devices/virtual/net/ppp0/queues/tx-0'
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'erspan0' (000000003a965506): kobject_cleanup, parent           (null)
kobject: 'erspan0' (000000003a965506): auto cleanup 'remove' event
kobject: 'rx-0' (00000000758a0514): kobject_cleanup, parent 0000000062c4d851
kobject: 'loop3' (00000000acfa5bb9): kobject_uevent_env
kobject: 'erspan0' (000000003a965506): kobject_uevent_env
kobject: 'erspan0' (000000003a965506): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'loop3' (00000000acfa5bb9): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'rx-0' (00000000758a0514): auto cleanup 'remove' event
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'erspan0' (000000003a965506): calling ktype release
kobject: 'rx-0' (00000000758a0514): kobject_uevent_env
kobject: 'rx-0' (00000000758a0514): fill_kobj_path: path = '/devices/virtual/net/ppp0/queues/rx-0'
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'rx-0' (00000000758a0514): auto cleanup kobject_del
kobject: 'rx-0' (00000000758a0514): calling ktype release
kobject: 'rx-0': free name
kobject: 'erspan0': free name
kobject: 'tx-0' (000000002d29845b): kobject_cleanup, parent 0000000062c4d851
kobject: 'tx-0' (000000002d29845b): auto cleanup 'remove' event
kobject: 'tx-0' (000000002d29845b): kobject_uevent_env
kobject: 'tx-0' (000000002d29845b): fill_kobj_path: path = '/devices/virtual/net/ppp0/queues/tx-0'
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'tx-0' (000000002d29845b): auto cleanup kobject_del
kobject: 'tx-0' (000000002d29845b): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (0000000062c4d851): kobject_cleanup, parent           (null)
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'queues' (0000000062c4d851): calling ktype release
kobject: 'queues' (0000000062c4d851): kset_release
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'queues': free name
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'ppp0' (00000000f9de0ebd): kobject_uevent_env
kobject: 'ppp0' (00000000f9de0ebd): fill_kobj_path: path = '/devices/virtual/net/ppp0'
kobject: 'rx-0' (00000000d6218135): kobject_cleanup, parent 00000000c2a4c002
kobject: 'rx-0' (00000000d6218135): auto cleanup 'remove' event
kobject: 'rx-0' (00000000d6218135): kobject_uevent_env
kobject: 'rx-0' (00000000d6218135): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'rx-0' (00000000d6218135): auto cleanup kobject_del
kobject: 'rx-0' (00000000d6218135): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (00000000fe22dbc4): kobject_cleanup, parent 00000000c2a4c002
kobject: 'tx-0' (00000000fe22dbc4): auto cleanup 'remove' event
kobject: 'tx-0' (00000000fe22dbc4): kobject_uevent_env
kobject: 'tx-0' (00000000fe22dbc4): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'tx-0' (00000000fe22dbc4): auto cleanup kobject_del
kobject: 'tx-0' (00000000fe22dbc4): calling ktype release
kobject: 'loop2' (000000005b0803e7): kobject_uevent_env
kobject: 'loop2' (000000005b0803e7): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'tx-0': free name
kobject: 'queues' (00000000c2a4c002): kobject_cleanup, parent           (null)
kobject: 'queues' (00000000c2a4c002): calling ktype release
kobject: 'queues' (00000000c2a4c002): kset_release
kobject: 'queues': free name
kobject: 'gretap0' (000000003aa12a17): kobject_uevent_env
kobject: 'gretap0' (000000003aa12a17): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'ppp0' (00000000f9de0ebd): kobject_cleanup, parent           (null)
kobject: 'ppp0' (00000000f9de0ebd): calling ktype release
kobject: 'ppp0': free name
kobject: 'gretap0' (000000003aa12a17): kobject_cleanup, parent           (null)
kobject: 'gretap0' (000000003aa12a17): auto cleanup 'remove' event
kobject: 'gretap0' (000000003aa12a17): kobject_uevent_env
kobject: 'loop1' (00000000720c8972): kobject_uevent_env
kobject: 'gretap0' (000000003aa12a17): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'loop1' (00000000720c8972): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'gretap0' (000000003aa12a17): calling ktype release
kobject: 'gretap0': free name
kobject: 'rx-0' (00000000b8d7fe93): kobject_cleanup, parent 00000000cff61912
kobject: 'rx-0' (00000000b8d7fe93): auto cleanup 'remove' event
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'rx-0' (00000000b8d7fe93): kobject_uevent_env
kobject: 'rx-0' (00000000b8d7fe93): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'rx-0' (00000000b8d7fe93): auto cleanup kobject_del
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'rx-0' (00000000b8d7fe93): calling ktype release
kobject: 'rx-0': free name
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'tx-0' (0000000079a092e5): kobject_cleanup, parent 00000000cff61912
kobject: 'tx-0' (0000000079a092e5): auto cleanup 'remove' event
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'tx-0' (0000000079a092e5): kobject_uevent_env
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'tx-0' (0000000079a092e5): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'tx-0' (0000000079a092e5): auto cleanup kobject_del
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'tx-0' (0000000079a092e5): calling ktype release
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'tx-0': free name
kobject: 'queues' (00000000cff61912): kobject_cleanup, parent           (null)
kobject: 'queues' (00000000cff61912): calling ktype release
kobject: 'queues' (00000000cff61912): kset_release
kobject: 'queues': free name
kobject: 'gre0' (00000000fe991eed): kobject_uevent_env
kobject: 'gre0' (00000000fe991eed): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'gre0' (00000000fe991eed): kobject_cleanup, parent           (null)
kobject: 'gre0' (00000000fe991eed): auto cleanup 'remove' event
kobject: 'gre0' (00000000fe991eed): kobject_uevent_env
kobject: 'gre0' (00000000fe991eed): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'gre0' (00000000fe991eed): calling ktype release
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'gre0': free name
kobject: 'loop2' (000000005b0803e7): kobject_uevent_env
kobject: 'loop2' (000000005b0803e7): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'rx-0' (000000007b958ec7): kobject_cleanup, parent 00000000da9faf7c
kobject: 'rx-0' (000000007b958ec7): auto cleanup 'remove' event
kobject: 'rx-0' (000000007b958ec7): kobject_uevent_env
kobject: 'rx-0' (000000007b958ec7): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'rx-0' (000000007b958ec7): auto cleanup kobject_del
kobject: 'loop1' (00000000720c8972): kobject_uevent_env
kobject: 'rx-0' (000000007b958ec7): calling ktype release
kobject: 'loop1' (00000000720c8972): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'rx-0': free name
kobject: 'tx-0' (00000000720b17e7): kobject_cleanup, parent 00000000da9faf7c
kobject: 'tx-0' (00000000720b17e7): auto cleanup 'remove' event
kobject: 'tx-0' (00000000720b17e7): kobject_uevent_env
kobject: 'tx-0' (00000000720b17e7): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'tx-0' (00000000720b17e7): auto cleanup kobject_del
kobject: 'tx-0' (00000000720b17e7): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (00000000da9faf7c): kobject_cleanup, parent           (null)
kobject: 'queues' (00000000da9faf7c): calling ktype release
kobject: 'queues' (00000000da9faf7c): kset_release
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'queues': free name
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'tunl0' (00000000abddfa63): kobject_uevent_env
kobject: 'tunl0' (00000000abddfa63): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'tunl0' (00000000abddfa63): kobject_cleanup, parent           (null)
kobject: 'tunl0' (00000000abddfa63): auto cleanup 'remove' event
kobject: 'tunl0' (00000000abddfa63): kobject_uevent_env
kobject: 'tunl0' (00000000abddfa63): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'tunl0' (00000000abddfa63): calling ktype release
kobject: 'tunl0': free name
kobject: 'rx-0' (00000000438c533c): kobject_cleanup, parent 0000000012124a6c
kobject: 'rx-0' (00000000438c533c): auto cleanup 'remove' event
kobject: 'rx-0' (00000000438c533c): kobject_uevent_env
kobject: 'rx-0' (00000000438c533c): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'rx-0' (00000000438c533c): auto cleanup kobject_del
kobject: 'rx-0' (00000000438c533c): calling ktype release
kobject: 'loop2' (000000005b0803e7): kobject_uevent_env
kobject: 'rx-0': free name
kobject: 'tx-0' (0000000003cf08b5): kobject_cleanup, parent 0000000012124a6c
kobject: 'tx-0' (0000000003cf08b5): auto cleanup 'remove' event
kobject: 'loop2' (000000005b0803e7): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'tx-0' (0000000003cf08b5): kobject_uevent_env
kobject: 'tx-0' (0000000003cf08b5): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'tx-0' (0000000003cf08b5): auto cleanup kobject_del
kobject: 'tx-0' (0000000003cf08b5): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (0000000012124a6c): kobject_cleanup, parent           (null)
kobject: 'queues' (0000000012124a6c): calling ktype release
kobject: 'queues' (0000000012124a6c): kset_release
kobject: 'queues': free name
kobject: 'lo' (0000000063f56d3d): kobject_uevent_env
kobject: 'lo' (0000000063f56d3d): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'lo' (0000000063f56d3d): kobject_cleanup, parent           (null)
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'lo' (0000000063f56d3d): auto cleanup 'remove' event
kobject: 'loop3' (00000000acfa5bb9): kobject_uevent_env
kobject: 'lo' (0000000063f56d3d): kobject_uevent_env
kobject: 'loop3' (00000000acfa5bb9): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'lo' (0000000063f56d3d): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'lo' (0000000063f56d3d): calling ktype release
kobject: 'lo': free name
kobject: 'loop1' (00000000720c8972): kobject_uevent_env
kobject: 'loop1' (00000000720c8972): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (000000005b0803e7): kobject_uevent_env
kobject: 'loop2' (000000005b0803e7): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (000000005b0803e7): kobject_uevent_env
kobject: 'loop2' (000000005b0803e7): fill_kobj_path: path = '/devices/virtual/block/loop2'
device bridge0 left promiscuous mode
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
kobject: 'loop1' (00000000720c8972): kobject_uevent_env
device team0 left promiscuous mode
device team_slave_0 left promiscuous mode
kobject: 'loop1' (00000000720c8972): fill_kobj_path: path = '/devices/virtual/block/loop1'
device team_slave_1 left promiscuous mode
kobject: 'loop3' (00000000acfa5bb9): kobject_uevent_env
kobject: 'loop3' (00000000acfa5bb9): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (00000000720c8972): kobject_uevent_env
kobject: 'loop1' (00000000720c8972): fill_kobj_path: path = '/devices/virtual/block/loop1'
[drm:drm_calc_timestamping_constants] *ERROR* crtc 29: Can't calculate constants, dotclock = 0!
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
kobject: 'loop1' (00000000720c8972): kobject_uevent_env
kobject: 'loop1' (00000000720c8972): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop2' (000000005b0803e7): kobject_uevent_env
kobject: 'loop2' (000000005b0803e7): fill_kobj_path: path = '/devices/virtual/block/loop2'
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (00000000720c8972): kobject_uevent_env
kobject: 'loop1' (00000000720c8972): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop5' (000000001c313088): kobject_uevent_env
kobject: 'loop5' (000000001c313088): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (00000000720c8972): kobject_uevent_env
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
kobject: 'loop1' (00000000720c8972): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (00000000acfa5bb9): kobject_uevent_env
kobject: 'loop3' (00000000acfa5bb9): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (000000009bad0829): kobject_uevent_env
kobject: 'loop4' (000000009bad0829): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop0' (0000000012c4dbf5): kobject_uevent_env
kobject: 'loop0' (0000000012c4dbf5): fill_kobj_path: path = '/devices/virtual/block/loop0'

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/12/05 23:56 upstream d08970904582 764b42c4 .config console log report ci-upstream-kasan-gce-smack-root
2018/12/05 17:01 upstream 0072a0c14d5b ac6c0578 .config console log report ci-upstream-kasan-gce-smack-root
2018/11/09 15:20 upstream 24ccea7e102d 8fd01d3a .config console log report ci-upstream-kasan-gce
* Struck through repros no longer work on HEAD.