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From: Muni Sekhar <munisekharrms@gmail.com>
To: linux-watchdog@vger.kernel.org, linux-pci@vger.kernel.org,
	wim@linux-watchdog.org, linux@roeck-us.net
Subject: watchdog: how to enable?
Date: Sat, 16 Nov 2019 06:05:05 +0530
Message-ID: <CAHhAz+h6SuGKWn0qNqsCdNjDks_vHuJW-KfiQja_b3x8x=vq_A@mail.gmail.com> (raw)

[ Please keep me in CC as I'm not subscribed to the list]

Hi All,

My kernel is built with the following options:

$ cat /boot/config-5.0.1 | grep NO_HZ
CONFIG_NO_HZ_COMMON=y
CONFIG_NO_HZ_IDLE=y
# CONFIG_NO_HZ_FULL is not set
CONFIG_NO_HZ=y
CONFIG_RCU_FAST_NO_HZ=y

I booted with watchdog enabled(nmi_watchdog=1) as given below:

BOOT_IMAGE=/boot/vmlinuz-5.0.1
root=UUID=f65454ae-3f1d-4b9e-b4be-74a29becbe1e ro debug
ignore_loglevel console=ttyUSB0,115200 console=tty0 console=tty1
console=ttyS2,115200 memmap=1M!1023M nmi_watchdog=1
crashkernel=384M-:128M

When the system is frozen or the kernel is locked up(I noticed that in
this state kernel is not responding for ALT-SysRq-<command key>) but
watchdog is not triggered. So I want to understand how to enable the
watchdog timer and how to verify the basic watchdog functionality
behavior?

Any pointers on this will be greatly appreciated.

--
Thanks,
Sekhar

             reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-16  0:35 Muni Sekhar [this message]
2019-11-16  1:04 ` Guenter Roeck
2019-11-16  3:03   ` Muni Sekhar
2019-11-16 16:01     ` Guenter Roeck
2019-11-16 18:34       ` Muni Sekhar
2019-11-16 21:42         ` Guenter Roeck
2019-11-18  9:52           ` Muni Sekhar
2019-11-18 14:10             ` Guenter Roeck
2019-11-18 15:07               ` Muni Sekhar
2019-11-18 14:38 ` Bjorn Helgaas
2019-11-18 14:41   ` Bjorn Helgaas
2019-11-18 15:09   ` Muni Sekhar
2019-11-22 10:59     ` Guenter Roeck
2019-11-22 12:54       ` Muni Sekhar

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