linux-ext4 - Re: task hung in ext4

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Date:   Fri, 20 Oct 2023 09:01:05 +0200
From:   "Linux regression tracking #adding (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Andres Freund <andres@...razel.de>, Theodore Ts'o <tytso@....edu>
Cc:     Shreeya Patel <shreeya.patel@...labora.com>,
        linux-ext4@...r.kernel.org,
        Ricardo Cañuelo <ricardo.canuelo@...labora.com>,
        gustavo.padovan@...labora.com, zsm@...gle.com, garrick@...gle.com,
        Linux regressions mailing list <regressions@...ts.linux.dev>
Subject: Re: task hung in ext4_fallocate #2

[TLDR: I'm adding this report to the list of tracked Linux kernel
regressions; the text you find below is based on a few templates
paragraphs you might have encountered already in similar form.
See link in footer if these mails annoy you.]

On 17.10.23 05:37, Andres Freund wrote:
> 
> As previously reported in https://lore.kernel.org/all/20231004004247.zkswbseowwwc6vvk@alap3.anarazel.de/
> I found some hangs below ext4_fallocate(), in 6.6-rc*.  As it looks like my
> issue was unrelated to the thread I had responded to, I was asked to start
> this new thread.
> 
> I just was able to reproduce the issue, after upgrading to 6.6-rc6 - this time
> it took ~55min of high load (io_uring using branch of postgres, running a
> write heavy transactional workload concurrently with concurrent bulk data
> load) to trigger the issue.
> 
> For now I have left the system running, in case there's something you would
> like me to check while the system is hung.
> [...]

Thanks for the report. To be sure the issue doesn't fall through the
cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression
tracking bot:

#regzbot ^introduced v6.5..v6.6-rc6
#regzbot title ext4: task hung in ext4_fallocate
#regzbot ignore-activity

This isn't a regression? This issue or a fix for it are already
discussed somewhere else? It was fixed already? You want to clarify when
the regression started to happen? Or point out I got the title or
something else totally wrong? Then just reply and tell me -- ideally
while also telling regzbot about it, as explained by the page listed in
the footer of this mail.

Developers: When fixing the issue, remember to add 'Link:' tags pointing
to the report (the parent of this mail). See page linked in footer for
details.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.