syzbot


INFO: task hung in linkwatch_event (3)

Status: upstream: reported on 2022/11/22 17:04
Reported-by: syzbot+d4b2f8282f84f54e87a1@syzkaller.appspotmail.com
First crash: 197d, last: 2d18h
similar bugs (9):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 INFO: task hung in linkwatch_event C 7 1106d 1326d 0/1 public: reported C repro on 2019/04/10 16:14
linux-4.14 INFO: task hung in linkwatch_event (2) 1 127d 127d 0/1 auto-obsoleted due to no activity on 2022/11/19 11:58
android-44 INFO: task hung in linkwatch_event 6 1542d 1687d 0/2 auto-closed as invalid on 2019/03/05 13:11
upstream INFO: task hung in linkwatch_event C 82 1134d 1746d 0/24 closed as dup on 2018/02/14 15:33
linux-4.14 INFO: task hung in linkwatch_event 5 810d 937d 0/1 auto-closed as invalid on 2021/01/05 01:42
linux-4.19 INFO: task hung in linkwatch_event (2) C error 203 19h15m 990d 0/1 upstream: reported C repro on 2020/03/11 20:12
upstream INFO: task hung in linkwatch_event (2) C done done 1033 215d 941d 22/24 fixed on 2022/05/13 11:13
linux-4.19 INFO: task hung in linkwatch_event 3 1144d 1257d 0/1 auto-closed as invalid on 2020/02/07 01:11
android-49 INFO: task hung in linkwatch_event 13 1306d 1322d 0/3 auto-closed as invalid on 2019/10/25 08:50

Sample crash report:
INFO: task kworker/0:13:6676 blocked for more than 143 seconds.
      Not tainted 6.0.0-syzkaller-09413-g4899a36f91a9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:13    state:D stack:23520 pid: 6676 ppid:     2 flags:0x00004000
Workqueue: events linkwatch_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5183 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6495
 schedule+0xda/0x1b0 kernel/sched/core.c:6571
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6630
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa44/0x1350 kernel/locking/mutex.c:747
 linkwatch_event+0xb/0x60 net/core/link_watch.c:263
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
INFO: task kworker/0:3:17176 blocked for more than 143 seconds.
      Not tainted 6.0.0-syzkaller-09413-g4899a36f91a9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3     state:D stack:26720 pid:17176 ppid:     2 flags:0x00004000
Workqueue: events switchdev_deferred_process_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5183 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6495
 schedule+0xda/0x1b0 kernel/sched/core.c:6571
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6630
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa44/0x1350 kernel/locking/mutex.c:747
 switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:75
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
INFO: task syz-executor.0:22669 blocked for more than 144 seconds.
      Not tainted 6.0.0-syzkaller-09413-g4899a36f91a9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:28632 pid:22669 ppid:     1 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5183 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6495
 schedule+0xda/0x1b0 kernel/sched/core.c:6571
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6630
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa44/0x1350 kernel/locking/mutex.c:747
 smc_pnet_create_pnetids_list net/smc/smc_pnet.c:805 [inline]
 smc_pnet_net_init+0x214/0x460 net/smc/smc_pnet.c:874
 smc_net_init+0x31/0x40 net/smc/af_smc.c:3342
 ops_init+0xaf/0x470 net/core/net_namespace.c:134
 setup_net+0x5d1/0xc50 net/core/net_namespace.c:325
 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3181
 __do_sys_unshare kernel/fork.c:3252 [inline]
 __se_sys_unshare kernel/fork.c:3250 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3250
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f918a48bb67
RSP: 002b:00007f918aadffa8 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fff932ac2b8 RCX: 00007f918a48bb67
RDX: 00007f918a4f761f RSI: 0000000000000000 RDI: 0000000040000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f918aadfc80
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003
R13: 00007fff932abd50 R14: 00007f918a5ac9d8 R15: 000000000000000c
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.0.0-syzkaller-09413-g4899a36f91a9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xc18/0xf50 kernel/hung_task.c:369
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.0.0-syzkaller-09413-g4899a36f91a9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2d/0x60 kernel/kcov.c:200
Code: 09 28 87 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 80 6f 02 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 bc 15 00 00 <85> c0 74 2b 8b 82 98 15 00 00 83 f8 02 75 20 48 8b 8a a0 15 00 00
RSP: 0018:ffffc900001572c8 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 1ffff9200002ae5a RCX: 0000000000000100
RDX: ffff888011a75880 RSI: ffffffff8758bc9c RDI: 0000000000000005
RBP: ffffffff88160720 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: 000000000008c07c R12: 0000000000000000
R13: ffffffff8de269a0 R14: ffff88804be48000 R15: ffff888049736000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c002af8e48 CR3: 000000000bc8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __netif_receive_skb_one_core+0x11c/0x180 net/core/dev.c:5487
 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5599
 netif_receive_skb_internal net/core/dev.c:5685 [inline]
 netif_receive_skb+0x12f/0x8d0 net/core/dev.c:5744
 NF_HOOK include/linux/netfilter.h:302 [inline]
 NF_HOOK include/linux/netfilter.h:296 [inline]
 br_pass_frame_up+0x303/0x410 net/bridge/br_input.c:68
 br_handle_frame_finish+0x909/0x1aa0 net/bridge/br_input.c:199
 br_nf_hook_thresh+0x2f8/0x3d0 net/bridge/br_netfilter_hooks.c:1041
 br_nf_pre_routing_finish_ipv6+0x695/0xef0 net/bridge/br_netfilter_ipv6.c:207
 NF_HOOK include/linux/netfilter.h:302 [inline]
 br_nf_pre_routing_ipv6+0x417/0x7c0 net/bridge/br_netfilter_ipv6.c:237
 br_nf_pre_routing+0x1496/0x1fe0 net/bridge/br_netfilter_hooks.c:507
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:255 [inline]
 br_handle_frame+0x9c9/0x12d0 net/bridge/br_input.c:399
 __netif_receive_skb_core+0x9fe/0x38f0 net/core/dev.c:5379
 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:5483
 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5599
 process_backlog+0x3a0/0x7c0 net/core/dev.c:5927
 __napi_poll+0xb3/0x6d0 net/core/dev.c:6494
 napi_poll net/core/dev.c:6561 [inline]
 net_rx_action+0x9c1/0xd90 net/core/dev.c:6672
 __do_softirq+0x1d0/0x9c8 kernel/softirq.c:571
 run_ksoftirqd kernel/softirq.c:934 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:926
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>

Crashes (76):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce 2022/10/10 22:48 upstream 4899a36f91a9 aea5da89 .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce 2022/10/04 04:45 upstream 4fe89d07dcc2 feb56351 .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce 2022/09/24 05:17 upstream 1707c39ae309 0042f2b4 .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce-selinux-root 2022/09/23 15:33 upstream bf682942cd26 0042f2b4 .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce-root 2022/09/15 07:43 upstream 3245cb65fd91 dd9a85ff .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce-selinux-root 2022/08/29 22:26 upstream b90cb1053190 5b44472d .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce-root 2022/08/28 22:08 upstream 10d4879f9ef0 07177916 .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce-root 2022/07/30 21:12 upstream 620725263f42 fef302b1 .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce-selinux-root 2022/07/10 14:33 upstream b1c428b6c368 b5765a15 .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce 2022/07/03 08:52 upstream 34074da5424c 1434eec0 .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce-selinux-root 2022/06/08 04:47 upstream f2906aa86338 b2706118 .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce-root 2022/06/01 15:40 upstream 700170bf6b4d 3666edfe .config log report info INFO: task hung in linkwatch_event
ci-upstream-kasan-gce-386 2022/10/22 17:41 upstream 4da34b7d175d c0b80a55 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/10/29 18:17 net a2c65a9d0568 899d812a .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/10/01 17:59 net ae3ed15da588 feb56351 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/09/02 07:12 net 42e66b1cc3a0 a805568e .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/07/31 13:31 net 9e98f8c7707f fef302b1 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/07/28 20:38 net bf84719df765 fb95c74d .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/07/11 23:51 net e45955766b43 da3d6955 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/07/07 19:35 net 07266d066301 bff65f44 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/30 23:17 net 0a18d802d65c 1434eec0 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/30 22:42 net 0a18d802d65c 1434eec0 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/30 21:43 net 0a18d802d65c 1434eec0 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/30 17:07 net e65af5403e46 1434eec0 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/30 06:24 net e65af5403e46 1434eec0 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/29 13:30 net ab84db251c04 496a8536 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/29 12:20 net ab84db251c04 496a8536 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/28 13:35 net 3b0dc529f56b ef82eb2c .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/28 13:14 net 3b0dc529f56b ef82eb2c .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/23 03:30 net 1e70212e0315 912f5df7 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/09 13:05 net 2061ecfdf235 0d5abf15 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/06/04 17:22 net 58f9d52ff689 c8857892 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-this-kasan-gce 2022/05/28 23:36 net 9bae058ab57f a46af346 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/11/21 19:43 net-next 8719a1c30d3a 1c576c23 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/11/19 10:37 net-next ab0377803daf 5bb70014 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/11/16 15:17 net-next 7eba4505394e 3a127a31 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/11/14 18:25 net-next ab00af85d2f8 943f4cb8 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/11/13 13:49 net-next b548b17a93fd 3ead01ad .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/11/12 17:25 net-next b548b17a93fd 3ead01ad .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/11/12 06:04 net-next 2cf7e87fc459 3ead01ad .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/11/10 21:28 net-next 0c9ef08a4d0f 3ead01ad .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/11/05 16:04 net-next fbeb229a6622 6d752409 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/11/04 14:21 net-next fbeb229a6622 6d752409 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/10/23 19:18 net-next 3bd5549bd479 23bf86af .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/09/18 08:44 net-next 44a8535fb87c dd9a85ff .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/09/14 14:12 net-next c9ae520ac3fa b884348d .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/09/08 20:24 net-next 929d43421ee5 f3027468 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/08/25 19:18 net-next c19d893fbf3f 9b5bf4cd .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/07/06 22:09 net-next 4874fb9484be bff65f44 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/07/06 03:17 net-next ec53d77ae3d5 bff65f44 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/07/02 07:24 net-next dbdd9a28e140 1434eec0 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/06/30 03:42 net-next d640516a65d8 1434eec0 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/06/24 19:37 net-next 93817be8b62c a5dbd430 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/06/22 00:48 net-next 8720bd951b8e 0fc5c330 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/06/19 19:50 net-next 9776fe0f424b 8f633d84 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/06/18 08:29 net-next 382f99c442b3 8f633d84 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/06/17 16:59 net-next 4875d94c69d5 cb58b3b2 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/06/12 08:28 net-next e10b02ee5b6c 0d5abf15 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/05/22 15:48 net-next aa5334b1f968 7268fa62 .config log report info INFO: task hung in linkwatch_event
ci-upstream-net-kasan-gce 2022/05/13 15:58 net-next b67fd3d9d942 107f6434 .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/24 07:27 linux-next 15f3bff12cf6 12c66417 .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/23 10:12 linux-next 15f3bff12cf6 75740b3f .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/16 21:35 linux-next 15f3bff12cf6 3a127a31 .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/16 05:12 linux-next 3c1f24109dfc 3a127a31 .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/15 10:44 linux-next 5c92ddca1053 97de9cfc .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/15 05:18 linux-next 5c92ddca1053 943f4cb8 .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/15 04:13 linux-next 5c92ddca1053 943f4cb8 .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/14 15:46 linux-next 5c92ddca1053 943f4cb8 .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/11 20:26 linux-next f8f60f322f06 3ead01ad .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/11 05:05 linux-next 0cdb3579f1ee 3ead01ad .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/09 12:14 linux-next 0cdb3579f1ee 5fa28208 .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/08 23:07 linux-next 0cdb3579f1ee 060f945e .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/11/06 09:22 linux-next 0cdb3579f1ee 6d752409 .config log report info INFO: task hung in linkwatch_event
ci-upstream-linux-next-kasan-gce-root 2022/09/04 07:59 linux-next e47eb90a0a9a 28811d0a .config log report info INFO: task hung in linkwatch_event
* Struck through repros no longer work on HEAD.