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Groups > linux.debian.kernel > #90946

Bug#1125948: dracut: fails to detect 3cpio

Cross-posted to 2 groups.

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On Sat, 2026-01-24 at 14:22 +0100, Santiago Vila wrote:
> retitle 1125948 dracut: fails to detect 3cpio
> thanks
> 
> On Fri, Jan 23, 2026 at 09:39:07PM +0100, Benjamin Drung wrote:
> > [...]
> > 
> > Is the 3cpio --help call failing? If so, why?
> 
> Thanks a lot for this detailed explanation about how all this is (was)
> supposed to work.
> 
> I'm doing a retitle to better reflect what we know about this failure.
> (Based on your explanations, if the autodetection worked as designed
> then there would be nothing wrong in calling "3cpio" as "3cpio").
> 
> 
> This looks like some kind of race condition to me, similar to this one
> which happened some time ago in the "sumo" package. This is the
> message where Niels diagnosed the problem and solved the mystery:
> 
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1082135#19
> 
> With the sumo package in mind, I looked at the dracut script
> to see if there was any occurrence of "&", and found that
> there is a "parallel mode".
> 
> Can you tell if this parallel mode is the default, and if not, what
> other reasons for a race condition can be?

I am not aware of any "parallel mode" here. The postinst calls dracut
just with >&2 to redirect stdout to stderr.

> I would be willing to build linux-signed-amd64 a lot of times using a
> modified dracut package with whatever debug changes we could add to
> see what's going on (even if they are simple "echo foo"), so I'm
> open for suggestions about those potential changes.

Thanks. Could you try to run a test with this patch applied to dracut:
https://github.com/dracut-ng/dracut-ng/pull/2109/changes

Plus add an "exit 1" after those 3 dinfo/dwarning calls to let dracut
fail, because I expect dracut to take the happy path.

-- 
Benjamin Drung
Debian & Ubuntu Developer

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Bug#1125948: dracut: Missing dependency on cpio (?) Benjamin Drung <bdrung@debian.org> - 2026-01-23 21:50 +0100
  Bug#1125948: dracut: fails to detect 3cpio Santiago Vila <sanvila@debian.org> - 2026-01-24 14:30 +0100
    Bug#1125948: dracut: fails to detect 3cpio Benjamin Drung <bdrung@debian.org> - 2026-01-24 15:20 +0100
      Bug#1125948: dracut: fails to detect 3cpio Santiago Vila <sanvila@debian.org> - 2026-01-24 17:40 +0100
        Bug#1125948: dracut: fails to detect 3cpio Santiago Vila <sanvila@debian.org> - 2026-01-24 19:30 +0100

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