Re: Regression found in memory stress test with stress-ng

[Baokun Li]

On 2025/3/20 10:49, AceLan Kao wrote:
> Hi all,
>
> We have found a regression while doing a memory stress test using
> stress-ng with the following command
>     sudo stress-ng --aggressive --verify --timeout 300 --mmapmany 0
>
> This issue occurs on recent kernel versions, and we have found that
> the following commit leads to the issue
>     4e63aeb5d010 ("blk-wbt: don't throttle swap writes in direct reclaim")
>
> Before reverting the commit directly, I wonder if we can identify the
> issue and implement a solution quickly.
> Currently, I'm unable to provide logs, as the system becomes
> unresponsive during testing. If you have any idea to capture logs,
> please let me know, I'm willing to help.
Hi AceLan,

I cannot reproduce this issue. The above command will trigger OOM.
Have you enabled panic_on_oom? (You can check by sysctl vm.panic_on_oom).
Or are there more kernel Oops reports in dmesg?


Regards,
Baokun
> Best regards,
> AceLan Kao.