Re: Tool to test soft and hardlockups.

[Vipul Jain <vipulsj@xxxxxxxxx>]

On Fri, Dec 13, 2013 at 12:32 PM, Vipul Jain <vipulsj@xxxxxxxxx> wrote:

On Fri, Dec 13, 2013 at 6:30 AM, <Valdis.Kletnieks@xxxxxx> wrote:

On Thu, 12 Dec 2013 16:45:32 -0800, Vipul Jain said:

> I would like  to enable softlockup and hardlockup option in Linux kernel
> and would like to test it to make sure that when soft and hard lockup
> condition arises we do see kernel taking configured action. Hence was
> wondering if there is any tool to do the same (basically injecting the
> errors).

Build your kernel with CONFIG_BOOTPARAM_HARDLOCKUP_PANIC and/or
CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC and then stick an infinite loop
somewhere in the kernel.  See lib/Kconfig.debug under 'Debug Lockups and Hangs'.

Hi Valids,

I am able to configure the kernel with soft and hard lockup flags but now I would like to generate and hard and soft lockup event and verify it and was wondering if we have any tool in place that I can use, if not, any guidance of how to go about testing it will be great.

Regards,

Vipul.

Hi Valids,

I did enable below flags but not sure if the softlockup and hardlockup detection mechanism is running on kernel so I added printk statements in kernel/watchdog.c but I don't see any prints in dmesg just wondering if you can help me to know why I don't see any prints in dmesg

CONFIG_LOCKUP_DETECTOR=y

CONFIG_HARDLOCKUP_DETECTOR=y

Regards,

Vipul.

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