Re: kernel freeze when running docker

[Vignesh Raman <vignesh.raman.in@gmail.com>]

Hi Julia,

On Tuesday 21 August 2018 07:12 PM, Julia Cartwright wrote:
> That's annoying.  When you are in this state can you trigger a dump via
> the magic sysrq sequence over serial?

No. I'm not able to trigger a crash using sysrq (Alt+SysRq+c). Keyboard
'caps lock' led light does not respond when caps lock key is pressed.

Does it indicate a softlockup or hardlockup ?

> Have you tried enabling the various lockup detectors?  There is a
> software-driven one, and an NMI watchdog based one.  Enabling both
> at the same time should be fine.

The below config options are enabled,
CONFIG_HAVE_HARDLOCKUP_DETECTOR_PERF=y
# Debug Lockups and Hangs
CONFIG_LOCKUP_DETECTOR=y
CONFIG_SOFTLOCKUP_DETECTOR=y
CONFIG_HARDLOCKUP_DETECTOR_PERF=y
CONFIG_HARDLOCKUP_CHECK_TIMESTAMP=y
CONFIG_HARDLOCKUP_DETECTOR=y
# CONFIG_BOOTPARAM_HARDLOCKUP_PANIC is not set
CONFIG_BOOTPARAM_HARDLOCKUP_PANIC_VALUE=0
# CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC is not set
CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE=0
CONFIG_HAVE_NMI=y
CONFIG_HAVE_PERF_EVENTS_NMI=y

CONFIG_BOOTPARAM_HARDLOCKUP_PANIC and CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC
is enabled using,
echo 1 > /proc/sys/kernel/softlockup_panic
echo 1 > /proc/sys/kernel/hardlockup_panic

In addition to this the below parameters were set,
echo 1 > /proc/sys/kernel/hung_task_panic
echo 1 > /proc/sys/kernel/panic
echo 1 > /proc/sys/kernel/panic_on_io_nmi
echo 1 > /proc/sys/kernel/panic_on_oops
echo 1 > /proc/sys/kernel/panic_on_unrecovered_nmi
echo 1 > /proc/sys/kernel/unknown_nmi_panic
echo 1 > /proc/sys/vm/panic_on_oom
echo 1 > /proc/sys/kernel/sysrq

Thanks.

Regards,
Vignesh