Bug#737054: oss-compat: deadlocks during remove

[Stephen Kitt]

Hi Andreas,

On Wed, 29 Jan 2014 20:39:29 +0100, Andreas Beckmann <anbe at debian.org> wrote:
> during a test with piuparts I noticed your package fails to remove,
> the apt-get command gets killed after a timeout and there are two
> processes running that probably didn't terminate as expected ...
> 
> >From the attached log (scroll to the bottom...):
> 
> 0m19.1s DEBUG: Starting command: ['chroot', '/tmp/piupartss/tmpqN70Hj',
> 'apt-get', 'remove', 'kmod', 'libkmod2:amd64', 'oss-compat'] 59m19.1s
> ERROR: Terminating command due to excessive runtime 59m19.6s DUMP: 
>   
>   
>   ***** Command was terminated after exceeding runtime limit (3540 s) *****
> 59m19.6s DEBUG: Command ok: ['chroot', '/tmp/piupartss/tmpqN70Hj',
> 'apt-get', 'remove', 'kmod', 'libkmod2:amd64', 'oss-compat'] 59m19.6s INFO:
> Running scripts post_remove 59m19.6s DEBUG: Starting command: ['chroot',
> '/tmp/piupartss/tmpqN70Hj', 'dpkg', '--purge', 'kmod', 'libkmod2:amd64']
> 59m19.6s DUMP: (Reading database ... 6709 files and directories currently
> installed.) Removing kmod (16-2) ...
>   Purging configuration files for kmod (16-2) ...
>   Removing libkmod2:amd64 (16-2) ...
>   Purging configuration files for libkmod2:amd64 (16-2) ...
> 59m19.6s DEBUG: Command ok: ['chroot', '/tmp/piupartss/tmpqN70Hj', 'dpkg',
> '--purge', 'kmod', 'libkmod2:amd64'] 59m19.6s DEBUG: Starting command:
> ['chroot', '/tmp/piupartss/tmpqN70Hj', 'dpkg', '--purge', 'oss-compat']
> 59m19.6s DUMP: (Reading database ... 6708 files and directories currently
> installed.) Removing oss-compat (5) ...
>   Purging configuration files for oss-compat (5) ...

Why is kmod purged before oss-compat? oss-compat depends on kmod, so
according to policy section 7.2, kmod should be left at least unpacked as
long as oss-compat is in the "configured" state (so that postinst and prerm
can use kmod).

(In any case there is a bug in oss-compat's prerm, I need to at least detach
the subshells that are started to remove the modules.)

Regards,

Stephen
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