INFO: task hung in netdev_run

INFO: task hung in netdev_run_todo
Status: upstream: reported on 2018/02/12 10:03
Reported-by: syzbot+8cd13ab48843d67c58f0@syzkaller.appspotmail.com
First crash: 503d, last: 10d

duplicates (8):
Title	Repro	Count	Last	Reported	Patched	Status
INFO: task hung in check_lifetime		1	505d	503d	0/13	closed as dup on 2018/02/12 10:05
INFO: task hung in __tun_chr_ioctl		2	231d	464d	0/13	closed as dup on 2018/03/19 06:35
INFO: task hung in tun_chr_close		4	199d	494d	0/13	closed as dup on 2018/02/16 08:24
INFO: task hung in fib6_rules_net_exit		1	453d	451d	0/13	closed as dup on 2018/03/31 16:17
INFO: task hung in tunnel_key_exit_net	syz	8	75d	451d	0/13	closed as dup on 2018/03/31 15:45
INFO: task hung in reg_check_chans_work		15	437d	496d	0/13	closed as dup on 2018/02/14 15:33
INFO: task hung in ip6gre_exit_batch_net		2	331d	386d	0/13	closed as dup on 2018/06/04 15:23
INFO: task hung in linkwatch_event	C	48	2d05h	496d	0/13	closed as dup on 2018/02/14 15:33

similar bugs (2):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
android-44	INFO: task hung in netdev_run_todo			1	438d	438d	0/2	auto-closed as invalid on 2019/02/22 12:49
android-49	INFO: task hung in netdev_run_todo			1	430d	430d	0/3	auto-closed as invalid on 2019/02/22 14:57

Sample crash report:

INFO: task kworker/u4:5:10771 blocked for more than 140 seconds.
      Not tainted 4.20.0-rc6+ #149
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:5    D13104 10771      2 0x80000000
Workqueue: netns cleanup_net
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472
 schedule+0xfe/0x460 kernel/sched/core.c:3516
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0xaff/0x16f0 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77
 netdev_run_todo+0x6ae/0xa60 net/core/dev.c:8802
 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:117
 ip_tunnel_delete_nets+0x4d7/0x6d0 net/ipv4/ip_tunnel.c:1083
 ipgre_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1060
 ops_exit_list.isra.5+0x105/0x160 net/core/net_namespace.c:156
 cleanup_net+0x555/0xb10 net/core/net_namespace.c:551
 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
INFO: task kworker/0:0:27593 blocked for more than 140 seconds.
      Not tainted 4.20.0-rc6+ #149
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:0     D19896 27593      2 0x80000000
Workqueue: events switchdev_deferred_process_work
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472
 schedule+0xfe/0x460 kernel/sched/core.c:3516
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0xaff/0x16f0 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77
 switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:150
 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
INFO: task kworker/0:4:17344 blocked for more than 140 seconds.
      Not tainted 4.20.0-rc6+ #149
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:4     D22584 17344      2 0x80000000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472
 schedule+0xfe/0x460 kernel/sched/core.c:3516
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0xaff/0x16f0 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77
 addrconf_verify_work+0xe/0x20 net/ipv6/addrconf.c:4481
 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
INFO: task syz-executor2:28843 blocked for more than 140 seconds.
      Not tainted 4.20.0-rc6+ #149
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D22352 28843  20828 0x80000004
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472
 schedule+0xfe/0x460 kernel/sched/core.c:3516
 exp_funnel_lock kernel/rcu/tree_exp.h:319 [inline]
 _synchronize_rcu_expedited.constprop.58+0x8df/0x9d0 kernel/rcu/tree_exp.h:620
 synchronize_rcu_expedited+0x27/0xa0 kernel/rcu/tree_exp.h:758
 synchronize_net+0x3b/0x60 net/core/dev.c:9074
 tipc_nametbl_stop+0x968/0xca0 net/tipc/name_table.c:797
 tipc_exit_net+0x2d/0x40 net/tipc/core.c:103
 ops_exit_list.isra.5+0xb0/0x160 net/core/net_namespace.c:153
 setup_net+0x501/0x8d0 net/core/net_namespace.c:331
 copy_net_ns+0x2b1/0x4a0 net/core/net_namespace.c:437
 create_new_namespaces+0x6ad/0x900 kernel/nsproxy.c:107
 unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:206
 ksys_unshare+0x79c/0x10b0 kernel/fork.c:2539
 __do_sys_unshare kernel/fork.c:2607 [inline]
 __se_sys_unshare kernel/fork.c:2605 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:2605
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457659
Code: fc ff 48 8b 44 24 08 48 8b 08 48 89 0c 24 e8 ee 27 fc ff e8 39 78 fc ff 48 8b 44 24 08 e9 95 fe ff ff e8 5a 28 00 00 e9 45 fe <ff> ff cc cc cc cc cc 48 8b 4c 24 10 48 8b 11 64 48 8b 1c 25 f8 ff
RSP: 002b:00007f0a4983ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000457659
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0a4983f6d4
R13: 00000000004c5a72 R14: 00000000004da238 R15: 00000000ffffffff
INFO: task syz-executor3:28833 blocked for more than 140 seconds.
      Not tainted 4.20.0-rc6+ #149
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D20920 28833  20511 0x80000004
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472
 schedule+0xfe/0x460 kernel/sched/core.c:3516
 exp_funnel_lock kernel/rcu/tree_exp.h:319 [inline]
 _synchronize_rcu_expedited.constprop.58+0x8df/0x9d0 kernel/rcu/tree_exp.h:620
 synchronize_rcu_expedited+0x27/0xa0 kernel/rcu/tree_exp.h:758
 synchronize_net+0x3b/0x60 net/core/dev.c:9074
 dev_deactivate_many+0x543/0xdd0 net/sched/sch_generic.c:1222
 __dev_close_many+0x197/0x380 net/core/dev.c:1461
 dev_close_many+0x2df/0x860 net/core/dev.c:1499
 rollback_registered_many+0x543/0x1250 net/core/dev.c:7991
 unregister_netdevice_many+0xfa/0x4c0 net/core/dev.c:9119
 ip_tunnel_delete_nets+0x4d2/0x6d0 net/ipv4/ip_tunnel.c:1082
 ipgre_tap_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1644
 ops_exit_list.isra.5+0x105/0x160 net/core/net_namespace.c:156
 setup_net+0x501/0x8d0 net/core/net_namespace.c:331
 copy_net_ns+0x2b1/0x4a0 net/core/net_namespace.c:437
 create_new_namespaces+0x6ad/0x900 kernel/nsproxy.c:107
 unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:206
 ksys_unshare+0x79c/0x10b0 kernel/fork.c:2539
 __do_sys_unshare kernel/fork.c:2607 [inline]
 __se_sys_unshare kernel/fork.c:2605 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:2605
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457659
Code: fc ff 48 8b 44 24 08 48 8b 08 48 89 0c 24 e8 ee 27 fc ff e8 39 78 fc ff 48 8b 44 24 08 e9 95 fe ff ff e8 5a 28 00 00 e9 45 fe <ff> ff cc cc cc cc cc 48 8b 4c 24 10 48 8b 11 64 48 8b 1c 25 f8 ff
RSP: 002b:00007f3c18bdfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000457659
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3c18be06d4
R13: 00000000004c5a72 R14: 00000000004da238 R15: 00000000ffffffff
INFO: task syz-executor3:28846 blocked for more than 140 seconds.
      Not tainted 4.20.0-rc6+ #149
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D21456 28846  20511 0x80000004
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472
 schedule+0xfe/0x460 kernel/sched/core.c:3516
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0xaff/0x16f0 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77
 tc_action_net_exit include/net/act_api.h:133 [inline]
 tunnel_key_exit_net+0x7d/0x450 net/sched/act_tunnel_key.c:580
 ops_exit_list.isra.5+0x105/0x160 net/core/net_namespace.c:156
 setup_net+0x501/0x8d0 net/core/net_namespace.c:331
 copy_net_ns+0x2b1/0x4a0 net/core/net_namespace.c:437
 create_new_namespaces+0x6ad/0x900 kernel/nsproxy.c:107
 unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:206
 ksys_unshare+0x79c/0x10b0 kernel/fork.c:2539
 __do_sys_unshare kernel/fork.c:2607 [inline]
 __se_sys_unshare kernel/fork.c:2605 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:2605
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457659
Code: fc ff 48 8b 44 24 08 48 8b 08 48 89 0c 24 e8 ee 27 fc ff e8 39 78 fc ff 48 8b 44 24 08 e9 95 fe ff ff e8 5a 28 00 00 e9 45 fe <ff> ff cc cc cc cc cc 48 8b 4c 24 10 48 8b 11 64 48 8b 1c 25 f8 ff
RSP: 002b:00007f3c18bbec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000457659
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3c18bbf6d4
R13: 00000000004c5a72 R14: 00000000004da238 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1018:
 #0: 000000007f29209b (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379
2 locks held by rsyslogd/5900:
 #0: 00000000dfe3fccb (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
 #1: 00000000fcdd7326 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1124 [inline]
 #1: 00000000fcdd7326 (&rq->lock){-.-.}, at: __schedule+0x236/0x21d0 kernel/sched/core.c:3410
2 locks held by getty/5991:
 #0: 000000001ba5639f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000006369a1b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5992:
 #0: 00000000f85a7427 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000005961a168 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5993:
 #0: 00000000cf8cf974 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000cb706d75 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5994:
 #0: 00000000fdd7cab6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000022a36220 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5995:
 #0: 0000000091fd6ddf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000009b4c2f5a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5996:
 #0: 00000000d17959e0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000375f3452 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5997:
 #0: 000000003ad07008 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000bb974e98 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
4 locks held by kworker/u4:5/10771:
 #0: 000000006d4da43a ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:209 [inline]
 #0: 000000006d4da43a ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 000000006d4da43a ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
 #0: 000000006d4da43a ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
 #0: 000000006d4da43a ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: 000000006d4da43a ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: 000000006d4da43a ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0xb43/0x1c40 kernel/workqueue.c:2124
 #1: 0000000049ba1eb4 (net_cleanup_work){+.+.}, at: process_one_work+0xb9a/0x1c40 kernel/workqueue.c:2128
 #2: 000000001545518b (pernet_ops_rwsem){++++}, at: cleanup_net+0x13f/0xb10 net/core/net_namespace.c:518
 #3: 000000007bce9571 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77
3 locks held by kworker/0:0/27593:
 #0: 00000000fccc4aee ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:209 [inline]
 #0: 00000000fccc4aee ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 00000000fccc4aee ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
 #0: 00000000fccc4aee ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
 #0: 00000000fccc4aee ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: 00000000fccc4aee ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: 00000000fccc4aee ((wq_completion)"events"){+.+.}, at: process_one_work+0xb43/0x1c40 kernel/workqueue.c:2124
 #1: 000000006956d2cf (deferred_process_work){+.+.}, at: process_one_work+0xb9a/0x1c40 kernel/workqueue.c:2128
 #2: 000000007bce9571 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77
3 locks held by kworker/0:4/17344:
 #0: 00000000cc904e35 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: __write_once_size include/linux/compiler.h:209 [inline]
 #0: 00000000cc904e35 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 00000000cc904e35 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
 #0: 00000000cc904e35 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
 #0: 00000000cc904e35 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: 00000000cc904e35 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: 00000000cc904e35 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0xb43/0x1c40 kernel/workqueue.c:2124
 #1: 00000000612f72a8 ((addr_chk_work).work){+.+.}, at: process_one_work+0xb9a/0x1c40 kernel/workqueue.c:2128
 #2: 000000007bce9571 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77
1 lock held by syz-executor2/28843:
 #0: 000000001545518b (pernet_ops_rwsem){++++}, at: copy_net_ns+0x28c/0x4a0 net/core/net_namespace.c:433
2 locks held by syz-executor3/28833:
 #0: 000000001545518b (pernet_ops_rwsem){++++}, at: copy_net_ns+0x28c/0x4a0 net/core/net_namespace.c:433
 #1: 000000007bce9571 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77
2 locks held by syz-executor3/28846:
 #0: 000000001545518b (pernet_ops_rwsem){++++}, at: copy_net_ns+0x28c/0x4a0 net/core/net_namespace.c:433
 #1: 000000007bce9571 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77

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

NMI backtrace for cpu 0
CPU: 0 PID: 1018 Comm: khungtaskd Not tainted 4.20.0-rc6+ #149
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.2+0x5c/0xa1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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+0xb51/0x1060 kernel/hung_task.c:289
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57

All crashes (10):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-kasan-gce-smack-root	2018/12/10 12:27	upstream	40e020c1	6565f24d	.config	log	report	christian@brauner.io, daniel@iogearbox.net, davem@davemloft.net, dsahern@gmail.com, jakub.kicinski@netronome.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, roopa@cumulusnetworks.com, xiyou.wangcong@gmail.com
ci-upstream-kasan-gce-smack-root	2018/11/01 15:47	upstream	5b744981	1f38e9ae	.config	log	report	christian@brauner.io, davem@davemloft.net, dsahern@gmail.com, fw@strlen.de, jakub.kicinski@netronome.com, jbenc@redhat.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2018/09/24 00:00	upstream	6bf4ca7f	28d9ac76	.config	log	report	christian.brauner@ubuntu.com, davem@davemloft.net, dsahern@gmail.com, fw@strlen.de, jakub.kicinski@netronome.com, jbenc@redhat.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, lucien.xin@gmail.com, netdev@vger.kernel.org, nicolas.dichtel@6wind.com
ci-upstream-kasan-gce	2018/03/29 15:07	upstream	0b412605	d47f0ed6	.config	log	report	christian.brauner@ubuntu.com, daniel@iogearbox.net, davem@davemloft.net, dsahern@gmail.com, fw@strlen.de, jbenc@redhat.com, linux-kernel@vger.kernel.org, lucien.xin@gmail.com, mschiffer@universe-factory.net, netdev@vger.kernel.org, vyasevich@gmail.com
ci-upstream-kasan-gce-386	2018/02/08 07:43	upstream	581e400f	9fb5ec43	.config	log	report	christian.brauner@ubuntu.com, daniel@iogearbox.net, davem@davemloft.net, dsahern@gmail.com, fw@strlen.de, jakub.kicinski@netronome.com, jbenc@redhat.com, linux-kernel@vger.kernel.org, lucien.xin@gmail.com, mschiffer@universe-factory.net, netdev@vger.kernel.org, vyasevich@gmail.com
ci-upstream-net-kasan-gce	2019/06/15 20:57	net-next	877cd9ff	442206d7	.config	log	report	ast@kernel.org, bpf@vger.kernel.org, christian@brauner.io, daniel@iogearbox.net, davem@davemloft.net, dsahern@gmail.com, hawk@kernel.org, idosch@mellanox.com, jakub.kicinski@netronome.com, johannes.berg@intel.com, john.fastabend@gmail.com, kafai@fb.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, petrm@mellanox.com, roopa@cumulusnetworks.com, songliubraving@fb.com, xdp-newbies@vger.kernel.org, yhs@fb.com
ci-upstream-net-kasan-gce	2018/03/31 14:18	net-next	c0b6edef	8fbce0e4	.config	log	report	christian.brauner@ubuntu.com, daniel@iogearbox.net, davem@davemloft.net, dsahern@gmail.com, fw@strlen.de, jbenc@redhat.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, lucien.xin@gmail.com, netdev@vger.kernel.org, vyasevich@gmail.com
ci-upstream-net-kasan-gce	2018/03/30 17:19	net-next	18845557	d47f0ed6	.config	log	report	christian.brauner@ubuntu.com, daniel@iogearbox.net, davem@davemloft.net, dsahern@gmail.com, fw@strlen.de, jbenc@redhat.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, lucien.xin@gmail.com, netdev@vger.kernel.org, vyasevich@gmail.com
ci-upstream-net-kasan-gce	2018/03/30 16:28	net-next	18845557	d47f0ed6	.config	log	report	christian.brauner@ubuntu.com, daniel@iogearbox.net, davem@davemloft.net, dsahern@gmail.com, fw@strlen.de, jbenc@redhat.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, lucien.xin@gmail.com, netdev@vger.kernel.org, vyasevich@gmail.com
ci-upstream-linux-next-kasan-gce-root	2019/02/22 19:23	linux-next	94a47529	6a5fcca4	.config	log	report	ast@kernel.org, christian@brauner.io, daniel@iogearbox.net, davem@davemloft.net, dsahern@gmail.com, hawk@kernel.org, idosch@mellanox.com, jakub.kicinski@netronome.com, john.fastabend@gmail.com, kafai@fb.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, petrm@mellanox.com, roopa@cumulusnetworks.com, songliubraving@fb.com, xdp-newbies@vger.kernel.org, yhs@fb.com