IPVS: stopping backup sync thread 26932 ...
IPVS: stopping backup sync thread 26947 ...
kworker/dying (54) used greatest stack depth: 8704 bytes left
INFO: task kthreadd:26950 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc6-next-20180725+ #18
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kthreadd        D28056 26950      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2820 [inline]
 __schedule+0x87c/0x1ed0 kernel/sched/core.c:3468
 schedule+0xfb/0x450 kernel/sched/core.c:3512
 kthread+0x26a/0x410 kernel/kthread.c:240
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 774 Comm: khungtaskd Not tainted 4.18.0-rc6-next-20180725+ #18
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+0x1c9/0x2b4 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x151/0x192 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:144 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0xb39/0x10b0 kernel/hung_task.c:265
 kthread+0x345/0x410 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
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: 774 Comm: khungtaskd Not tainted 4.18.0-rc6-next-20180725+ #18
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+0x1c9/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0xb4a/0x10b0 kernel/hung_task.c:265
 kthread+0x345/0x410 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..