linux-kernel - Re: PROBLEM: kernel crashes when running xfsdump since ~6.4

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Message-ID: <012b7244-fa12-452c-9d76-7768e59f7e03@draconx.ca>
Date: Thu, 20 Jun 2024 10:36:11 -0400
From: Nick Bowler <nbowler@...conx.ca>
To: Hailong Liu <hailong.liu@...o.com>
Cc: linux-kernel@...r.kernel.org,
 Linux regressions mailing list <regressions@...ts.linux.dev>,
 linux-mm@...ck.org, sparclinux@...r.kernel.org,
 "Uladzislau Rezki (Sony)" <urezki@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: PROBLEM: kernel crashes when running xfsdump since ~6.4

On 2024-06-20 02:37, Hailong Liu wrote:
> On Thu, 20. Jun 02:19, Nick Bowler wrote:
>> After upgrading my sparc to 6.9.5 I noticed that attempting to run
>> xfsdump instantly (within a couple seconds) and reliably crashes the
>> kernel.  The same problem is also observed on 6.10-rc4.
[...]
>>   062eacf57ad91b5c272f89dc964fd6dd9715ea7d is the first bad commit
>>   commit 062eacf57ad91b5c272f89dc964fd6dd9715ea7d
>>   Author: Uladzislau Rezki (Sony) <urezki@...il.com>
>>   Date:   Thu Mar 30 21:06:38 2023 +0200
>>
>>       mm: vmalloc: remove a global vmap_blocks xarray
[...]
>>   spitfire_data_access_exception: SFSR[000000000080100d] SFAR[0000000000c51ba0], going.
>>                 \|/ ____ \|/
>>                 "@'/ .. \`@"
>>                 /_| \__/ |_\
>>                    \__U_/
>>   xfsdump(2028): Dax [#1]
>>   CPU: 0 PID: 2028 Comm: xfsdump Not tainted 6.9.5 #199
>>   TSTATE: 0000000811001607 TPC: 0000000000974fc4 TNPC: 0000000000974fc8 Y: 00000000    Not tainted
>>   TPC: <queued_spin_lock_slowpath+0x1d0/0x2cc>
[...]
> I guess you can patch this
> https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?h=mm-hotfixes-unstable&id=00468d41c20cac748c2e4bfcf003283d554673f5

I tried with that patch applied on top of 6.10-rc4, and the crash still
occurs.  There is no obvious change in behaviour.

Thanks,
  Nick