linux-kernel - Re: [linus:master] [mm, slub] fa9b88e459: kernel_BUG_at

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Message-ID: <Y74VfdHtEAmmbAHP@yujie-X299>
Date:   Wed, 11 Jan 2023 09:48:45 +0800
From:   Yujie Liu <yujie.liu@...el.com>
To:     Vlastimil Babka <vbabka@...e.cz>
CC:     kernel test robot <oliver.sang@...el.com>,
        <oe-lkp@...ts.linux.dev>, <lkp@...el.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Christoph Lameter <cl@...ux.com>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [linus:master] [mm, slub] fa9b88e459:
 kernel_BUG_at_include/linux/page-flags.h

On Mon, Jan 09, 2023 at 11:57:12PM +0100, Vlastimil Babka wrote:
> On 1/8/23 17:28, kernel test robot wrote:
> > Greeting,
> > 
> > FYI, we noticed kernel_BUG_at_include/linux/page-flags.h due to commit (built with gcc-11):
> > 
> > commit: fa9b88e459d710cadf3b01e8a64eda00cc91cdd6 ("mm, slub: refactor free debug processing")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> 
> Thanks for trying to bisect the root cause to earlier commit than
> 0af8489b0216f, as we discussed. Here I strongly suspect it's also earlier
> than this commit. Because the code changed here is only used with
> SLUB_DEBUG, which is not enabled in your config. Only later in 0af8489b0216f
> it becomes used also by SLUB_TINY.

Sorry for this false report. We don't have much confidence in bisecting
this issue since the reproducing rate is very low, so it's difficult to
mark good or bad during bisection.

Thanks for the latest update at:
https://lore.kernel.org/all/d024b846-9282-4ecd-eafd-2e5571932a72@suse.cz/
The test results so far have been summarized by Oliver in the previous
report. Will keep you updated if we find other clues. Thanks.

--
Best Regards,
Yujie

> > [test failed on linux-next/master 469a89fd3bb73bb2eea628da2b3e0f695f80b7ce]
> > 
> > in testcase: boot
> > 
> > on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
> > 
> > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> > 
>