linux-kernel - Re: [PATCH 6.16 000/627] 6.16.1-rc1 review

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Message-ID: <42aace87-1b89-4b17-96f1-3efbabc4acf3@huaweicloud.com>
Date: Thu, 14 Aug 2025 09:27:49 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: stable@...r.kernel.org, patches@...ts.linux.dev,
 linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
 akpm@...ux-foundation.org, linux@...ck-us.net, shuah@...nel.org,
 patches@...nelci.org, lkft-triage@...ts.linaro.org, pavel@...x.de,
 jonathanh@...dia.com, f.fainelli@...il.com, sudipm.mukherjee@...il.com,
 srw@...dewatkins.net, rwarsow@....de, conor@...nel.org,
 hargar@...rosoft.com, broonie@...nel.org, achill@...ill.org,
 qemu-devel@...gnu.org, Alex Bennée
 <alex.bennee@...aro.org>, Arnd Bergmann <arnd@...db.de>,
 Dan Carpenter <dan.carpenter@...aro.org>,
 Anders Roxell <anders.roxell@...aro.org>,
 Ben Copeland <benjamin.copeland@...aro.org>, LTP List <ltp@...ts.linux.it>,
 chrubis <chrubis@...e.cz>, Petr Vorel <pvorel@...e.cz>,
 Ian Rogers <irogers@...gle.com>, linux-perf-users@...r.kernel.org,
 Joseph Qi <jiangqi903@...il.com>, Jan Kara <jack@...e.cz>,
 linux-fsdevel@...r.kernel.org, linux-ext4 <linux-ext4@...r.kernel.org>,
 Zhang Yi <yi.zhang@...wei.com>, Theodore Ts'o <tytso@....edu>,
 Baokun Li <libaokun1@...wei.com>
Subject: Re: [PATCH 6.16 000/627] 6.16.1-rc1 review

On 2025/8/13 22:53, Greg Kroah-Hartman wrote:
> On Wed, Aug 13, 2025 at 08:01:51PM +0530, Naresh Kamboju wrote:
>> Hi Greg,
>>
>>>> 2)
>>>>
>>>> The following list of LTP syscalls failure noticed on qemu-arm64 with
>>>> stable-rc 6.16.1-rc1 with CONFIG_ARM64_64K_PAGES=y build configuration.
>>>>
>>>> Most failures report ENOSPC (28) or mkswap errors, which may be related
>>>> to disk space handling in the 64K page configuration on qemu-arm64.
>>>>
>>>> The issue is reproducible on multiple runs.
>>>>
>>>> * qemu-arm64, ltp-syscalls - 64K page size test failures list,
>>>>
>>>>   - fallocate04
>>>>   - fallocate05
>>>>   - fdatasync03
>>>>   - fsync01
>>>>   - fsync04
>>>>   - ioctl_fiemap01
>>>>   - swapoff01
>>>>   - swapoff02
>>>>   - swapon01
>>>>   - swapon02
>>>>   - swapon03
>>>>   - sync01
>>>>   - sync_file_range02
>>>>   - syncfs01
>>>>
>>>> Reproducibility:
>>>>  - 64K config above listed test fails
>>>>  - 4K config above listed test pass.
>>>>
>>>> Regression Analysis:
>>>> - New regression? yes
>>>
>>> Regression from 6.16?  Or just from 6.15.y?
>>
>> Based on available data, the issue is not present in v6.16 or v6.15.
>>
>> Anders, bisected this regression and found,
>>
>>   ext4: correct the reserved credits for extent conversion
>>     [ Upstream commit 95ad8ee45cdbc321c135a2db895d48b374ef0f87 ]
>>
>> Report lore link,
>>
>> https://lore.kernel.org/stable/CA+G9fYtBnCSa2zkaCn-oZKYz8jz5FZj0HS7DjSfMeamq3AXqNg@mail.gmail.com/
> 
> Great, and that's also affecting 6.17-rc1 so we are "bug compatible"?
> :)
> 

Hi,

This issue has already fixed in 6.17-rc1 through this series:

https://lore.kernel.org/linux-ext4/20250707140814.542883-1-yi.zhang@huaweicloud.com/


To fix this issue in 6.16, it's necessary to backport the whole series
instead of just pick 5137d6c8906b ("ext4: fix insufficient credits
calculation in ext4_meta_trans_blocks()") and 95ad8ee45cdb {"ext4: correct
the reserved credits for extent conversion").  Otherwise, this will make
the problem more likely to occur.

Thanks,
Yi.