linux-kernel - Re: [kthread] 40966e316f: WARNING:at_kernel/sched/core.c:#sched

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Date:   Fri, 17 Dec 2021 11:01:41 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     kernel test robot <oliver.sang@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: Re: [kthread]  40966e316f: WARNING:at_kernel/sched/core.c:#sched_init

kernel test robot <oliver.sang@...el.com> writes:

> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: 40966e316f86b8cfd83abd31ccb4df729309d3e7 ("kthread: Ensure struct kthread is present for all kthreads")
> https://git.kernel.org/cgit/linux/kernel/git/ebiederm/user-namespace.git signal-for-v5.17
>
> in testcase: trinity
> version: trinity-x86_64-608712d8-1_20211207
> with following parameters:
>
> 	runtime: 300s
>
> test-description: Trinity is a linux system call fuzz tester.
> test-url: http://codemonkey.org.uk/projects/trinity/
>
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>
> caused below changes (please refer to attached dmesg/kmsg for entire
> log/backtrace):


Ok. That is very weird.  I will dig into it.

Silly question is there anything in this testing to cause memory
allocations to fail early in boot?

Eric