On 10/9/20 11:03 AM, Felix Lechner wrote:
> Hi Baptiste,
>
> On Fri, Oct 9, 2020 at 12:30 AM Baptiste BEAUPLAT <lyknode@cilg.org> wrote:
>>
>> the issue is intermittent
>
> In which percentage of cases does this issue occur, please?
With xargs I'd say 90% reproducibility.
Single run is closer to 1 out of 3.
> I am unable to reproduce it in twenty runs locally on stable-bpo, in
> which I develop ("bare metal"), without the 'time' command which is,
> for some reason, not available in that position in my version of bash.
> I made twenty runs:
>
> $ seq 1 2 | xargs -I {} -P 0 bin/lintian
> ../bugs/lyknode/gnome-user-docs-3.38.1-1/gnome-user-docs_3.38.1-1_amd64.changes
> E: gnome-user-docs: description-is-pkg-name GNOME user docs
> W: gnome-user-docs source: incomplete-creative-commons-license
> cc-by-3.0 (line 7)
> I: gnome-user-docs: unusual-documentation-package-name
> P: gnome-user-docs source: silent-on-rules-requiring-root
> E: gnome-user-docs: description-is-pkg-name GNOME user docs
> W: gnome-user-docs source: incomplete-creative-commons-license
> cc-by-3.0 (line 7)
> I: gnome-user-docs: unusual-documentation-package-name
> P: gnome-user-docs source: silent-on-rules-requiring-root
>
> Right now, my best guess is a race condition or other problem in this routine:
>
> https://salsa.debian.org/lintian/lintian/-/blob/master/lib/Lintian/IO/Select.pm#L75
>
> The issue should be easy to track down, if it is caused by Lintian,
> because Lintian no longer does anything in parallel. That routine is
> the sole exception.
>
> Untarring is an expensive operation, and the two indices would
> otherwise require two such operations in addition to the actual
> unpacking.
>
> In your case, the index of 'installed' files seems to be the issue.
> Indices are now unpacked on demand. Do you see the issue with just a
> single check that accesses Processable::installed, for example with
> '-C files/special'?
Yes. The issue does occur with the following command:
lintian -d -C files/special gnome-user-docs_3.38.1-1_all.deb
I did 10 runs, the stuck rate was 50%.
List of zombies processes varies over the runs but it's always among the
same processes (the 3 tars and 2 dpkg-deb).
>
> Ideally, you would run it only on the offending *.deb. Thanks!
--
Baptiste Beauplat - lyknode
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