syzbot


INFO: task hung in fib6_rules_net_exit

Status: closed as dup on 2018/03/31 16:17
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+69bf48842d5035daa7a6@syzkaller.appspotmail.com
First crash: 2248d, last: 2248d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
INFO: task hung in netdev_run_todo net 12 1739d 2294d
Discussions (1)
Title Replies (including bot) Last reply
INFO: task hung in fib6_rules_net_exit 1 (2) 2018/03/31 16:16
Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in fib6_rules_net_exit 1 856d 856d 0/1 auto-closed as invalid on 2022/05/19 15:58
linux-4.19 INFO: task hung in fib6_rules_net_exit (2) 1 663d 663d 0/1 auto-obsoleted due to no activity on 2022/11/29 01:33
upstream INFO: task hung in fib6_rules_net_exit (2) net 7 1247d 1337d 0/26 auto-closed as invalid on 2021/03/25 09:49
android-49 INFO: task hung in fib6_rules_net_exit 1 2035d 1868d 0/3 auto-closed as invalid on 2019/04/28 09:31
upstream INFO: task hung in fib6_rules_net_exit (3) net 24 947d 981d 0/26 auto-closed as invalid on 2022/01/18 22:47
android-49 INFO: task hung in fib6_rules_net_exit (2) 1 1696d 1696d 0/3 auto-closed as invalid on 2020/01/31 05:34

Sample crash report:
netlink: 8 bytes leftover after parsing attributes in process `syz-executor5'.
IPVS: stopping backup sync thread 7398 ...
INFO: task kworker/u4:3:163 blocked for more than 120 seconds.
      Not tainted 4.16.0-rc6+ #286
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:3    D19440   163      2 0x80000000
Workqueue: netns cleanup_net
Call Trace:
 context_switch kernel/sched/core.c:2862 [inline]
 __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440
 schedule+0xf5/0x430 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74
 fib6_rules_net_exit+0x12/0x50 net/ipv6/fib6_rules.c:392
 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:151
 cleanup_net+0x4d8/0xa90 net/core/net_namespace.c:522
 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113
 worker_thread+0x223/0x1990 kernel/workqueue.c:2247
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 868 Comm: khungtaskd Not tainted 4.16.0-rc6+ #286
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x123/0x180 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:138 [inline]
 check_hung_task kernel/hung_task.c:132 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
 watchdog+0x90c/0xd60 kernel/hung_task.c:249
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
Kernel panic - not syncing: hung_task: blocked tasks
CPU: 1 PID: 868 Comm: khungtaskd Not tainted 4.16.0-rc6+ #286
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 check_hung_task kernel/hung_task.c:133 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
 watchdog+0x91d/0xd60 kernel/hung_task.c:249
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/03/30 07:01 net-next-old 18845557fd6f d47f0ed6 .config console log report ci-upstream-net-kasan-gce
* Struck through repros no longer work on HEAD.