linux-kernel - Occasional hung with UM after enable VMAP

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Date:   Tue, 4 Jan 2022 15:10:06 -0300
From:   Walter Lozano <walter.lozano@...labora.com>
To:     johannes@...solutions.net, linux-um@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Sjoerd Simons <sjoerd.simons@...labora.com>,
        ritesh sarraf <ritesh.sarraf@...labora.com>
Subject: Occasional hung with UM after enable VMAP_STACK

Hi all,

I noticed that after "um: enable VMAP_STACK" [1] I experienced some 
occasional hung in my Gitlab CI jobs that use user-mode-linux to build 
distro images. The configuration use for the building is the one 
available from Debian, see [2] and [3]. Unfortunately I don't have much 
information, when the issue arises the job seems to hang and it is 
cancelled by Gitlab due to a job timeout.

So far I did some bisect to get the commit which introduces the issue 
and a quick check with latest Linux stable branch master to confirm the 
issue is still present. I know this is not a proper bug report but I 
thought it will be better to at least raise a comment.

Thanks in advance,

Walter

[1] http://lists.infradead.org/pipermail/linux-um/2021-August/001657.html

[2] https://packages.debian.org/bookworm/user-mode-linux

[3] https://salsa.debian.org/uml-team/user-mode-linux

-- 
Walter Lozano
Collabora Ltd.