linux-kernel - Re: [linus:master] [mm, slub] 0af8489b02: kernel_BUG_at

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Message-ID: <Y8ZMHi4IGP+v7biC@xsang-OptiPlex-9020>
Date:   Tue, 17 Jan 2023 15:19:58 +0800
From:   Oliver Sang <oliver.sang@...el.com>
To:     Vlastimil Babka <vbabka@...e.cz>
CC:     Hyeonggon Yoo <42.hyeyoo@...il.com>, <oe-lkp@...ts.linux.dev>,
        <lkp@...el.com>, Mike Rapoport <rppt@...ux.ibm.com>,
        Christoph Lameter <cl@...ux.com>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [linus:master] [mm, slub] 0af8489b02:
 kernel_BUG_at_include/linux/mm.h

Hi, Vlastimil,

On Thu, Jan 12, 2023 at 08:56:59AM +0100, Vlastimil Babka wrote:
> 
> Actually no, by "obscure" means with CONFIG_SLUB_DEBUG it wouldn't happen
> anymore. But this is the opposite, it seems to happen a lot. I would have
> preferred that slub debugging catches some slab misuse, but this seems
> useful too. With such fail rates you can perhaps try ealier kernels than 6.0
> and eventually find the truly clean and first bad release and bisect?

Thanks a lot for guidance!

yeah, we reached back to until v5.14-rc1 which still has similar issue,
and v5.13 is clean. new bisection was triggered then we got '7118fc2906'

this was already reported as
"[linus:master] [hugetlb]  7118fc2906: kernel_BUG_at_lib/list_debug.c"
at https://lore.kernel.org/all/202301170941.49728982-oliver.sang@intel.com/
and I add you, Hyeonggon, Feng and Fengwei there.

hope that would be helpful.