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possible deadlock in __wake_up_common_lock

Status: fixed on 2019/03/06 07:43
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+93d94a001cfbce9e60e1@syzkaller.appspotmail.com
Fix commit: 73444bc4d8f9 mm, page_alloc: do not wake kswapd with zone lock held
First crash: 1953d, last: 1940d
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
possible deadlock in __wake_up_common_lock 14 (15) 2019/01/08 13:08
[PATCH] mm, page_alloc: Do not wake kswapd with zone lock held 3 (3) 2019/01/04 09:46

Sample crash report:
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
net_ratelimit: 28 callbacks suppressed
A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check.
IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready
======================================================
WARNING: possible circular locking dependency detected
5.0.0-rc1+ #15 Not tainted
------------------------------------------------------
syz-executor0/5266 is trying to acquire lock:
00000000da7e5142 (&pgdat->kswapd_wait){....}, at: __wake_up_common_lock+0x19b/0x390 kernel/sched/wait.c:120

but task is already holding lock:
00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: spin_lock include/linux/spinlock.h:329 [inline]
00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: rmqueue_bulk mm/page_alloc.c:2548 [inline]
00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: __rmqueue_pcplist mm/page_alloc.c:3021 [inline]
00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: rmqueue_pcplist mm/page_alloc.c:3050 [inline]
00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: rmqueue mm/page_alloc.c:3072 [inline]
00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: get_page_from_freelist+0x1ab1/0x5190 mm/page_alloc.c:3491

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&(&zone->lock)->rlock){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
       rmqueue mm/page_alloc.c:3082 [inline]
       get_page_from_freelist+0x13d0/0x5190 mm/page_alloc.c:3491
       __alloc_pages_nodemask+0x4fd/0xdc0 mm/page_alloc.c:4529
       alloc_pages_current+0x107/0x210 mm/mempolicy.c:2106
       alloc_pages include/linux/gfp.h:509 [inline]
       depot_save_stack+0x3da/0x460 lib/stackdepot.c:260
       save_stack+0xa9/0xd0 mm/kasan/common.c:79
       set_track mm/kasan/common.c:85 [inline]
       kasan_kmalloc mm/kasan/common.c:482 [inline]
       kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455
       kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:397
       slab_post_alloc_hook mm/slab.h:444 [inline]
       slab_alloc mm/slab.c:3379 [inline]
       kmem_cache_alloc+0x11a/0x710 mm/slab.c:3539
       kmem_cache_zalloc include/linux/slab.h:730 [inline]
       fill_pool lib/debugobjects.c:134 [inline]
       __debug_object_init+0xb1d/0x12d0 lib/debugobjects.c:379
       debug_object_init lib/debugobjects.c:431 [inline]
       debug_object_activate+0x348/0x550 lib/debugobjects.c:512
       debug_timer_activate kernel/time/timer.c:708 [inline]
       debug_activate kernel/time/timer.c:763 [inline]
       __mod_timer kernel/time/timer.c:1040 [inline]
       mod_timer+0x4e7/0x1430 kernel/time/timer.c:1101
       key_schedule_gc+0xf3/0x120 security/keys/gc.c:69
       key_reject_and_link+0x365/0x710 security/keys/key.c:596
       key_negate_and_link include/linux/key-type.h:197 [inline]
       complete_request_key+0xe3/0x120 security/keys/request_key.c:38
       call_sbin_request_key+0xb3b/0x10f0 security/keys/request_key.c:194
       construct_key security/keys/request_key.c:235 [inline]
       construct_key_and_link security/keys/request_key.c:484 [inline]
       request_key_and_link+0x1295/0x1890 security/keys/request_key.c:593
       __do_sys_request_key security/keys/keyctl.c:212 [inline]
       __se_sys_request_key security/keys/keyctl.c:157 [inline]
       __x64_sys_request_key+0x284/0x430 security/keys/keyctl.c:157
       do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #3 (&base->lock){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
       lock_timer_base+0xb7/0x2a0 kernel/time/timer.c:937
       __mod_timer kernel/time/timer.c:1009 [inline]
       mod_timer kernel/time/timer.c:1101 [inline]
       add_timer+0x884/0x1470 kernel/time/timer.c:1137
       __queue_delayed_work+0x253/0x390 kernel/workqueue.c:1533
       queue_delayed_work_on+0x19a/0x200 kernel/workqueue.c:1558
       queue_delayed_work include/linux/workqueue.h:527 [inline]
       schedule_delayed_work include/linux/workqueue.h:628 [inline]
       psi_group_change kernel/sched/psi.c:485 [inline]
       psi_task_change+0x3ea/0x590 kernel/sched/psi.c:534
       psi_enqueue kernel/sched/stats.h:82 [inline]
       enqueue_task kernel/sched/core.c:727 [inline]
       activate_task+0x1f8/0x470 kernel/sched/core.c:751
       wake_up_new_task+0x50c/0xd30 kernel/sched/core.c:2423
       _do_fork+0x2a5/0x1170 kernel/fork.c:2251
       kernel_thread+0x34/0x40 kernel/fork.c:2285
       rest_init+0x28/0x37b init/main.c:408
       arch_call_rest_init+0xe/0x1b
       start_kernel+0x882/0x8bd init/main.c:740
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
       x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
       secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

-> #2 (&rq->lock){-.-.}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
       _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
       rq_lock kernel/sched/sched.h:1149 [inline]
       task_fork_fair+0xb5/0x7a0 kernel/sched/fair.c:10058
       sched_fork+0x437/0xb90 kernel/sched/core.c:2359
       copy_process+0x1f95/0x8710 kernel/fork.c:1886
       _do_fork+0x1a9/0x1170 kernel/fork.c:2226
       kernel_thread+0x34/0x40 kernel/fork.c:2285
       rest_init+0x28/0x37b init/main.c:408
       arch_call_rest_init+0xe/0x1b
       start_kernel+0x882/0x8bd init/main.c:740
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
       x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
       secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

-> #1 (&p->pi_lock){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
       try_to_wake_up+0xb9/0x1480 kernel/sched/core.c:1965
       default_wake_function+0x30/0x50 kernel/sched/core.c:3710
       autoremove_wake_function+0x79/0x360 kernel/sched/wait.c:375
       __wake_up_common+0x1d3/0x7d0 kernel/sched/wait.c:92
       __wake_up_common_lock+0x1c6/0x390 kernel/sched/wait.c:121
       __wake_up+0xe/0x10 kernel/sched/wait.c:145
       wakeup_kswapd+0x5ba/0x8f0 mm/vmscan.c:3982
       wake_all_kswapds+0x14d/0x300 mm/page_alloc.c:3975
       __alloc_pages_slowpath+0x1ecf/0x2cc0 mm/page_alloc.c:4246
       __alloc_pages_nodemask+0xa37/0xdc0 mm/page_alloc.c:4549
       alloc_pages_current+0x107/0x210 mm/mempolicy.c:2106
       alloc_pages include/linux/gfp.h:509 [inline]
       __vmalloc_area_node mm/vmalloc.c:1690 [inline]
       __vmalloc_node_range+0x5cf/0x910 mm/vmalloc.c:1750
       __vmalloc_node mm/vmalloc.c:1795 [inline]
       vmalloc_user+0x71/0x160 mm/vmalloc.c:1865
       vb2_vmalloc_alloc+0x134/0x3a0 drivers/media/common/videobuf2/videobuf2-vmalloc.c:48
       __vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:210 [inline]
       __vb2_queue_alloc+0x5a6/0xf40 drivers/media/common/videobuf2/videobuf2-core.c:365
       vb2_core_reqbufs+0x8cf/0xf10 drivers/media/common/videobuf2/videobuf2-core.c:733
       vb2_ioctl_reqbufs+0x2c2/0x450 drivers/media/common/videobuf2/videobuf2-v4l2.c:892
       v4l_reqbufs drivers/media/v4l2-core/v4l2-ioctl.c:1918 [inline]
       v4l_reqbufs+0xad/0xe0 drivers/media/v4l2-core/v4l2-ioctl.c:1907
       __video_do_ioctl+0x805/0xd80 drivers/media/v4l2-core/v4l2-ioctl.c:2858
       video_usercopy+0x460/0x16b0 drivers/media/v4l2-core/v4l2-ioctl.c:3040
       video_ioctl2+0x2d/0x35 drivers/media/v4l2-core/v4l2-ioctl.c:3084
       v4l2_ioctl+0x156/0x1b0 drivers/media/v4l2-core/v4l2-dev.c:364
       vfs_ioctl fs/ioctl.c:46 [inline]
       file_ioctl fs/ioctl.c:509 [inline]
       do_vfs_ioctl+0x107b/0x17d0 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+0x1a3/0x800 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (&pgdat->kswapd_wait){....}:
       lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
       __wake_up_common_lock+0x19b/0x390 kernel/sched/wait.c:120
       __wake_up+0xe/0x10 kernel/sched/wait.c:145
       wakeup_kswapd+0x5ba/0x8f0 mm/vmscan.c:3982
       steal_suitable_fallback+0x50d/0x7c0 mm/page_alloc.c:2217
       __rmqueue_fallback mm/page_alloc.c:2502 [inline]
       __rmqueue mm/page_alloc.c:2528 [inline]
       rmqueue_bulk mm/page_alloc.c:2550 [inline]
       __rmqueue_pcplist mm/page_alloc.c:3021 [inline]
       rmqueue_pcplist mm/page_alloc.c:3050 [inline]
       rmqueue mm/page_alloc.c:3072 [inline]
       get_page_from_freelist+0x2f53/0x5190 mm/page_alloc.c:3491
       __alloc_pages_nodemask+0x4fd/0xdc0 mm/page_alloc.c:4529
       alloc_pages_current+0x107/0x210 mm/mempolicy.c:2106
       alloc_pages include/linux/gfp.h:509 [inline]
       __vmalloc_area_node mm/vmalloc.c:1690 [inline]
       __vmalloc_node_range+0x5cf/0x910 mm/vmalloc.c:1750
       __vmalloc_node mm/vmalloc.c:1795 [inline]
       vmalloc_user+0x71/0x160 mm/vmalloc.c:1865
       vb2_vmalloc_alloc+0x134/0x3a0 drivers/media/common/videobuf2/videobuf2-vmalloc.c:48
       __vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:210 [inline]
       __vb2_queue_alloc+0x5a6/0xf40 drivers/media/common/videobuf2/videobuf2-core.c:365
       vb2_core_reqbufs+0x8cf/0xf10 drivers/media/common/videobuf2/videobuf2-core.c:733
       vb2_ioctl_reqbufs+0x2c2/0x450 drivers/media/common/videobuf2/videobuf2-v4l2.c:892
       v4l_reqbufs drivers/media/v4l2-core/v4l2-ioctl.c:1918 [inline]
       v4l_reqbufs+0xad/0xe0 drivers/media/v4l2-core/v4l2-ioctl.c:1907
       __video_do_ioctl+0x805/0xd80 drivers/media/v4l2-core/v4l2-ioctl.c:2858
       video_usercopy+0x460/0x16b0 drivers/media/v4l2-core/v4l2-ioctl.c:3040
       video_ioctl2+0x2d/0x35 drivers/media/v4l2-core/v4l2-ioctl.c:3084
       v4l2_ioctl+0x156/0x1b0 drivers/media/v4l2-core/v4l2-dev.c:364
       vfs_ioctl fs/ioctl.c:46 [inline]
       file_ioctl fs/ioctl.c:509 [inline]
       do_vfs_ioctl+0x107b/0x17d0 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+0x1a3/0x800 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  &pgdat->kswapd_wait --> &base->lock --> &(&zone->lock)->rlock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&(&zone->lock)->rlock);
                               lock(&base->lock);
                               lock(&(&zone->lock)->rlock);
  lock(&pgdat->kswapd_wait);

 *** DEADLOCK ***

2 locks held by syz-executor0/5266:
 #0: 00000000fdd702ba (&dev->mutex#3){+.+.}, at: __video_do_ioctl+0x3b1/0xd80 drivers/media/v4l2-core/v4l2-ioctl.c:2826
 #1: 00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: spin_lock include/linux/spinlock.h:329 [inline]
 #1: 00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: rmqueue_bulk mm/page_alloc.c:2548 [inline]
 #1: 00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: __rmqueue_pcplist mm/page_alloc.c:3021 [inline]
 #1: 00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: rmqueue_pcplist mm/page_alloc.c:3050 [inline]
 #1: 00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: rmqueue mm/page_alloc.c:3072 [inline]
 #1: 00000000e0c5e054 (&(&zone->lock)->rlock){-.-.}, at: get_page_from_freelist+0x1ab1/0x5190 mm/page_alloc.c:3491

stack backtrace:
CPU: 1 PID: 5266 Comm: syz-executor0 Not tainted 5.0.0-rc1+ #15
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+0x1db/0x2d0 lib/dump_stack.c:113
 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1224
 check_prev_add kernel/locking/lockdep.c:1866 [inline]
 check_prevs_add kernel/locking/lockdep.c:1979 [inline]
 validate_chain kernel/locking/lockdep.c:2350 [inline]
 __lock_acquire+0x3014/0x4a30 kernel/locking/lockdep.c:3338
 lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
 __wake_up_common_lock+0x19b/0x390 kernel/sched/wait.c:120
 __wake_up+0xe/0x10 kernel/sched/wait.c:145
 wakeup_kswapd+0x5ba/0x8f0 mm/vmscan.c:3982
 steal_suitable_fallback+0x50d/0x7c0 mm/page_alloc.c:2217
 __rmqueue_fallback mm/page_alloc.c:2502 [inline]
 __rmqueue mm/page_alloc.c:2528 [inline]
 rmqueue_bulk mm/page_alloc.c:2550 [inline]
 __rmqueue_pcplist mm/page_alloc.c:3021 [inline]
 rmqueue_pcplist mm/page_alloc.c:3050 [inline]
 rmqueue mm/page_alloc.c:3072 [inline]
 get_page_from_freelist+0x2f53/0x5190 mm/page_alloc.c:3491
 __alloc_pages_nodemask+0x4fd/0xdc0 mm/page_alloc.c:4529
 alloc_pages_current+0x107/0x210 mm/mempolicy.c:2106
 alloc_pages include/linux/gfp.h:509 [inline]
 __vmalloc_area_node mm/vmalloc.c:1690 [inline]
 __vmalloc_node_range+0x5cf/0x910 mm/vmalloc.c:1750
 __vmalloc_node mm/vmalloc.c:1795 [inline]
 vmalloc_user+0x71/0x160 mm/vmalloc.c:1865
 vb2_vmalloc_alloc+0x134/0x3a0 drivers/media/common/videobuf2/videobuf2-vmalloc.c:48
 __vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:210 [inline]
 __vb2_queue_alloc+0x5a6/0xf40 drivers/media/common/videobuf2/videobuf2-core.c:365
 vb2_core_reqbufs+0x8cf/0xf10 drivers/media/common/videobuf2/videobuf2-core.c:733
 vb2_ioctl_reqbufs+0x2c2/0x450 drivers/media/common/videobuf2/videobuf2-v4l2.c:892
 v4l_reqbufs drivers/media/v4l2-core/v4l2-ioctl.c:1918 [inline]
 v4l_reqbufs+0xad/0xe0 drivers/media/v4l2-core/v4l2-ioctl.c:1907
 __video_do_ioctl+0x805/0xd80 drivers/media/v4l2-core/v4l2-ioctl.c:2858
 video_usercopy+0x460/0x16b0 drivers/media/v4l2-core/v4l2-ioctl.c:3040
 video_ioctl2+0x2d/0x35 drivers/media/v4l2-core/v4l2-ioctl.c:3084
 v4l2_ioctl+0x156/0x1b0 drivers/media/v4l2-core/v4l2-dev.c:364
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x107b/0x17d0 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+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3fde2c5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000020000000 RSI: 00000000c0145608 RDI: 0000000000000005
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3fde2c66d4
R13: 00000000004c2d12 R14: 00000000004d53e0 R15: 00000000ffffffff
kobject: 'loop0' (000000003c5392ad): kobject_uevent_env
kobject: 'loop0' (000000003c5392ad): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'tun0' (00000000108c6a92): kobject_add_internal: parent: 'net', set: 'devices'
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'loop4' (00000000a714fca2): kobject_uevent_env
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop4' (00000000a714fca2): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'tun0' (00000000108c6a92): kobject_uevent_env
kobject: 'tun0' (00000000108c6a92): fill_kobj_path: path = '/devices/virtual/net/tun0'
kobject: 'loop1' (00000000a414821b): kobject_uevent_env
kobject: 'queues' (00000000430933ef): kobject_add_internal: parent: 'tun0', set: '<NULL>'
kobject: 'queues' (00000000430933ef): kobject_uevent_env
kobject: 'loop1' (00000000a414821b): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'queues' (00000000430933ef): kobject_uevent_env: filter function caused the event to drop!
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'rx-0' (00000000e8778986): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'loop3' (0000000007b7b77e): kobject_uevent_env
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'rx-0' (00000000e8778986): kobject_uevent_env
kobject: 'loop3' (0000000007b7b77e): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'rx-0' (00000000e8778986): fill_kobj_path: path = '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'tx-0' (000000000c51a3f9): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'loop3' (0000000007b7b77e): kobject_uevent_env
kobject: 'loop3' (0000000007b7b77e): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'tx-0' (000000000c51a3f9): kobject_uevent_env
kobject: 'tx-0' (000000000c51a3f9): fill_kobj_path: path = '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'loop4' (00000000a714fca2): kobject_uevent_env
kobject: 'loop4' (00000000a714fca2): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (00000000a414821b): kobject_uevent_env
kobject: 'loop1' (00000000a414821b): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (00000000a714fca2): kobject_uevent_env
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
kobject: 'loop4' (00000000a714fca2): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (00000000a414821b): kobject_uevent_env
kobject: 'loop1' (00000000a414821b): fill_kobj_path: path = '/devices/virtual/block/loop1'
chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19
kobject: 'loop2' (00000000ceca5d23): kobject_uevent_env
kobject: 'loop2' (00000000ceca5d23): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (00000000a714fca2): kobject_uevent_env
kobject: 'loop4' (00000000a714fca2): fill_kobj_path: path = '/devices/virtual/block/loop4'
caif:caif_disconnect_client(): nothing to disconnect
chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT
chnl_net:chnl_net_open(): state disconnected
A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check.
kobject: 'rx-0' (00000000e8778986): kobject_cleanup, parent 00000000430933ef
kobject: 'rx-0' (00000000e8778986): auto cleanup 'remove' event
kobject: 'rx-0' (00000000e8778986): kobject_uevent_env
kobject: 'rx-0' (00000000e8778986): fill_kobj_path: path = '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'rx-0' (00000000e8778986): auto cleanup kobject_del
kobject: 'rx-0' (00000000e8778986): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (000000000c51a3f9): kobject_cleanup, parent 00000000430933ef
kobject: 'tx-0' (000000000c51a3f9): auto cleanup 'remove' event
kobject: 'tx-0' (000000000c51a3f9): kobject_uevent_env
kobject: 'tx-0' (000000000c51a3f9): fill_kobj_path: path = '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'tx-0' (000000000c51a3f9): auto cleanup kobject_del
kobject: 'tx-0' (000000000c51a3f9): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (00000000430933ef): kobject_cleanup, parent           (null)
kobject: 'queues' (00000000430933ef): calling ktype release
kobject: 'queues' (00000000430933ef): kset_release
kobject: 'queues': free name
kobject: 'tun0' (00000000108c6a92): kobject_uevent_env
kobject: 'tun0' (00000000108c6a92): fill_kobj_path: path = '/devices/virtual/net/tun0'
kobject: 'tun0' (00000000108c6a92): kobject_cleanup, parent           (null)
kobject: 'tun0' (00000000108c6a92): calling ktype release
kobject: 'tun0': free name
kobject: 'loop5' (00000000dc20e8f8): kobject_uevent_env
kobject: 'loop5' (00000000dc20e8f8): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop3' (0000000007b7b77e): kobject_uevent_env
kobject: 'loop3' (0000000007b7b77e): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (000000003c5392ad): kobject_uevent_env
kobject: 'loop0' (000000003c5392ad): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'tun0' (00000000c5252856): kobject_add_internal: parent: 'net', set: 'devices'
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'tun0' (00000000c5252856): kobject_uevent_env
kobject: 'tun0' (00000000c5252856): fill_kobj_path: path = '/devices/virtual/net/tun0'
kobject: 'queues' (000000007c6a2f45): kobject_add_internal: parent: 'tun0', set: '<NULL>'
kobject: 'queues' (000000007c6a2f45): kobject_uevent_env
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop1' (00000000a414821b): kobject_uevent_env
kobject: 'queues' (000000007c6a2f45): kobject_uevent_env: filter function caused the event to drop!
kobject: 'loop1' (00000000a414821b): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'rx-0' (00000000fe2c52cb): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'rx-0' (00000000fe2c52cb): kobject_uevent_env
kobject: 'rx-0' (00000000fe2c52cb): fill_kobj_path: path = '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'tx-0' (00000000043c0e2b): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'loop1' (00000000a414821b): kobject_uevent_env
kobject: 'tx-0' (00000000043c0e2b): kobject_uevent_env
kobject: 'loop1' (00000000a414821b): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'tx-0' (00000000043c0e2b): fill_kobj_path: path = '/devices/virtual/net/tun0/queues/tx-0'
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19
caif:caif_disconnect_client(): nothing to disconnect
kobject: 'loop2' (00000000ceca5d23): kobject_uevent_env
kobject: 'loop2' (00000000ceca5d23): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop1' (00000000a414821b): kobject_uevent_env
chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT
kobject: 'loop1' (00000000a414821b): fill_kobj_path: path = '/devices/virtual/block/loop1'
chnl_net:chnl_net_open(): state disconnected
A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check.
kobject: 'loop2' (00000000ceca5d23): kobject_uevent_env
kobject: 'loop2' (00000000ceca5d23): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'rx-0' (00000000fe2c52cb): kobject_cleanup, parent 000000007c6a2f45
kobject: 'rx-0' (00000000fe2c52cb): auto cleanup 'remove' event
kobject: 'rx-0' (00000000fe2c52cb): kobject_uevent_env
kobject: 'rx-0' (00000000fe2c52cb): fill_kobj_path: path = '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'rx-0' (00000000fe2c52cb): auto cleanup kobject_del
kobject: 'rx-0' (00000000fe2c52cb): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (00000000043c0e2b): kobject_cleanup, parent 000000007c6a2f45
kobject: 'tx-0' (00000000043c0e2b): auto cleanup 'remove' event
kobject: 'tx-0' (00000000043c0e2b): kobject_uevent_env
kobject: 'tx-0' (00000000043c0e2b): fill_kobj_path: path = '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'loop2' (00000000ceca5d23): kobject_uevent_env
kobject: 'tx-0' (00000000043c0e2b): auto cleanup kobject_del
kobject: 'loop2' (00000000ceca5d23): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'tx-0' (00000000043c0e2b): calling ktype release
kobject: 'loop1' (00000000a414821b): kobject_uevent_env
kobject: 'loop1' (00000000a414821b): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'tx-0': free name
kobject: 'queues' (000000007c6a2f45): kobject_cleanup, parent           (null)
kobject: 'queues' (000000007c6a2f45): calling ktype release
kobject: 'queues' (000000007c6a2f45): kset_release
kobject: 'queues': free name
kobject: 'tun0' (00000000c5252856): kobject_uevent_env
kobject: 'tun0' (00000000c5252856): fill_kobj_path: path = '/devices/virtual/net/tun0'
kobject: 'tun0' (00000000c5252856): kobject_cleanup, parent           (null)
kobject: 'tun0' (00000000c5252856): calling ktype release
kobject: 'tun0': free name
kobject: 'loop5' (00000000dc20e8f8): kobject_uevent_env
kobject: 'loop5' (00000000dc20e8f8): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (000000003c5392ad): kobject_uevent_env
kobject: 'loop0' (000000003c5392ad): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop3' (0000000007b7b77e): kobject_uevent_env
kobject: 'loop3' (0000000007b7b77e): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (00000000ceca5d23): kobject_uevent_env
kobject: 'loop2' (00000000ceca5d23): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop0' (000000003c5392ad): kobject_uevent_env
kobject: 'loop0' (000000003c5392ad): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000a414821b): kobject_uevent_env
kobject: 'loop1' (00000000a414821b): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (00000000a714fca2): kobject_uevent_env
kobject: 'loop4' (00000000a714fca2): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'tun0' (00000000838bace4): kobject_add_internal: parent: 'net', set: 'devices'
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop0' (000000003c5392ad): kobject_uevent_env
kobject: 'tun0' (00000000838bace4): kobject_uevent_env
kobject: 'loop0' (000000003c5392ad): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'tun0' (00000000838bace4): fill_kobj_path: path = '/devices/virtual/net/tun0'
kobject: 'loop1' (00000000a414821b): kobject_uevent_env
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'loop1' (00000000a414821b): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'queues' (000000002f7ae620): kobject_add_internal: parent: 'tun0', set: '<NULL>'
kobject: 'queues' (000000002f7ae620): kobject_uevent_env
kobject: 'queues' (000000002f7ae620): kobject_uevent_env: filter function caused the event to drop!
kobject: 'kvm' (0000000011d76fd6): kobject_uevent_env
kobject: 'rx-0' (00000000f9427fd4): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'rx-0' (00000000f9427fd4): kobject_uevent_env
kobject: 'kvm' (0000000011d76fd6): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'rx-0' (00000000f9427fd4): fill_kobj_path: path = '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'tx-0' (00000000d51ec532): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'tx-0' (00000000d51ec532): kobject_uevent_env
kobject: 'tx-0' (00000000d51ec532): fill_kobj_path: path = '/devices/virtual/net/tun0/queues/tx-0'

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/01/08 21:14 upstream 7b5585136713 010ed08b .config console log report ci-upstream-kasan-gce-smack-root
2019/01/08 20:54 upstream 7b5585136713 010ed08b .config console log report ci-upstream-kasan-gce-386
2018/12/29 07:48 upstream f346b0becb1b e33ad0f1 .config console log report ci-upstream-kasan-gce-386
2019/01/11 09:50 net-old b19bce0335e2 80dde172 .config console log report ci-upstream-net-this-kasan-gce
2019/01/06 16:20 linux-next a4983672f9ca 94f8adb5 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/06 01:34 linux-next a4983672f9ca 53be0a37 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/03 22:19 linux-next a4983672f9ca 66fcd29b .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.