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

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Date:   Mon, 9 Jan 2023 23:57:12 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     kernel test robot <yujie.liu@...el.com>,
        kernel test robot <oliver.sang@...el.com>
Cc:     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 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.

> [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):
>