Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter

From	Raphael Hertzog <hertzog@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter
Date	2017-09-07 16:00 +0200
Message-ID	<un5vz-A2-7@gated-at.bofh.it> (permalink)
References	<uhEcH-1bd-31@gated-at.bofh.it> <un24F-71m-3@gated-at.bofh.it> <uhEcH-1bd-31@gated-at.bofh.it> <un24F-71m-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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On Thu, 07 Sep 2017, Raphael Hertzog wrote:
> Is there anything that can be done by vmdebootstrap to force-trigger the
> creation of that entry even when chrooted?

Yes, "udevadm trigger" or "udevadm trigger /dev/mapper/loop0p1" works
well for that. So we have a work-around at least (thanks to Felipe Sateler
for the suggestion, thanks also to Mantas Mikulėnas who taught me about
the kernel/udev interactions).

But I'm clearly not able to go further than that, debugging the kernel
would be too time-consuming for me since I'm not a kernel developer...
so I'll stop my investigations here.

(Somehow I wonder whether this is not the result of some kernel
hardening... limiting the impact of things done within a chroot
compared to the main host. schroot also uses private bind mounts, can this
be related?)

Cheers,
-- 
Raphaël Hertzog ◈ Debian Developer

Support Debian LTS: https://www.freexian.com/services/debian-lts.html
Learn to master Debian: https://debian-handbook.info/get/

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Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter Raphael Hertzog <hertzog@debian.org> - 2017-09-07 12:20 +0200
  Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter Raphael Hertzog <hertzog@debian.org> - 2017-09-07 13:00 +0200
    Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter Ben Hutchings <ben@decadent.org.uk> - 2017-09-07 17:00 +0200
      Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter Raphael Hertzog <hertzog@debian.org> - 2017-09-07 18:00 +0200
        Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter Ben Hutchings <ben@decadent.org.uk> - 2017-09-11 21:10 +0200
          Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter Raphael Hertzog <hertzog@debian.org> - 2017-09-11 21:50 +0200
            Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter Ben Hutchings <ben@decadent.org.uk> - 2017-09-12 01:20 +0200
              Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter Raphael Hertzog <hertzog@debian.org> - 2017-09-12 09:40 +0200
  Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter Raphael Hertzog <hertzog@debian.org> - 2017-09-07 16:00 +0200

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