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Bug#505111: marked as done (rescue-mode md auto-assembly could cause data loss)

Your message dated Sat, 07 Aug 2010 15:04:31 +0000
with message-id <E1Ohkwp-0005BR-MD@franck.debian.org>
and subject line Bug#505111: fixed in rescue 1.23
has caused the Debian Bug report #505111,
regarding rescue-mode md auto-assembly could cause data loss
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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immediately.)


-- 
505111: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=505111
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: debian-installer
Version: 20081029
Severity: grave

I have a system with /dev/sd{a1,b2} and /dev/sd{a2,b3} being two
separate RAID1s, /dev/md[01] respectively.

Due to historic reasons, /dev/sdb1 is a small partition with
something else.

Also, historically, /dev/sd[ab] used to be part of an array
themselves (the whole disk, not just a partition). As a result,
mdadm could identify three arrays on this system:

  1. /dev/sd[ab]
  2. /dev/sd{a1,b2}
  3. /dev/sd{a2,b3}

I wanted to run mdadm --zero-superblock on /dev/sd[ab] to clear up
the mess and because I have a working netboot setup, I thought I'd
just use the Debian-installer's rescue mode to get exclusive access
to the disks, which mdadm needs.

I started rescue mode and was surprised that only /dev/sd[ab] were
created, but no partitions. A glance into /proc/mdstat shows that
the installer had auto-assembled /dev/sd[ab] into /dev/md0 and md
was happily synchronising and overwriting my /dev/sdb1 partition.

Arguably, since /dev/sd[ab] held valid superblocks, they could have
been assembled. However, the other two pairs also held valid
superblocks, yet the installer didn't care.

I strongly oppose to any form of RAID auto-assembly in rescue mode,
which is only a sure-fire way to wreck your data. Auto-assemble
should not take place especially when there are nested superblocks.

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-1-amd64 (SMP w/1 CPU core)
Locale: LANG=en_GB, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash


-- 
 .''`.   martin f. krafft <madduck@debian.org>
: :'  :  proud Debian developer, author, administrator, and user
`. `'`   http://people.debian.org/~madduck - http://debiansystem.info
  `-  Debian - when you have better things to do than fixing systems

Attachment: digital_signature_gpg.asc
Description: Digital signature (see http://martin-krafft.net/gpg/)


--- End Message ---
--- Begin Message --- 
Source: rescue
Source-Version: 1.23

We believe that the bug you reported is fixed in the latest version of
rescue, which is due to be installed in the Debian FTP archive:

rescue-check_1.23_all.udeb
  to main/r/rescue/rescue-check_1.23_all.udeb
rescue-mode_1.23_all.udeb
  to main/r/rescue/rescue-mode_1.23_all.udeb
rescue_1.23.dsc
  to main/r/rescue/rescue_1.23.dsc
rescue_1.23.tar.gz
  to main/r/rescue/rescue_1.23.tar.gz



A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 505111@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Colin Watson <cjwatson@debian.org> (supplier of updated rescue package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Sat, 07 Aug 2010 16:37:41 +0100
Source: rescue
Binary: rescue-check rescue-mode
Architecture: source all
Version: 1.23
Distribution: unstable
Urgency: low
Maintainer: Debian Install System Team <debian-boot@lists.debian.org>
Changed-By: Colin Watson <cjwatson@debian.org>
Description: 
 rescue-check - enter d-i rescue mode if requested (udeb)
 rescue-mode - mount requested partition and start a rescue shell (udeb)
Closes: 505111
Changes: 
 rescue (1.23) unstable; urgency=low
 .
   * Use 'dh $@ --options' rather than 'dh --options $@', for
     forward-compatibility with debhelper v8.
   * Add a menu entry for RAID assembly rather than discovering and
     assembling arrays automatically (closes: #505111).
 .
   [ Updated translations ]
   * Persian (fa.po) by Ebrahim Byagowi
   * Finnish (fi.po) by Esko Arajärvi
   * Kazakh (kk.po) by Baurzhan Muftakhidinov
   * Kurdish (ku.po) by Erdal Ronahi
   * Portuguese (Brazil) (pt_BR.po) by Felipe Augusto van de Wiel (faw)
   * Serbian (sr.po) by Janos Guljas
Checksums-Sha1: 
 b9f41d38f6cb76259c1715673ea8d0446cbcb3ca 1515 rescue_1.23.dsc
 193916511a9e96d98bcd6dee8557341a3e610dd8 113749 rescue_1.23.tar.gz
 1d654774ddf54b8d80db0dd44d5bfc4354f42945 2360 rescue-check_1.23_all.udeb
 c1a568b4aaf5fc9683bac52ff3fcec9086b5e2b1 99670 rescue-mode_1.23_all.udeb
Checksums-Sha256: 
 02fd3b0215e2cda59480545fe62934c0b575ffe7f7615ff5452a73a06f27cadc 1515 rescue_1.23.dsc
 e29c37b87c4cde91a08877441df3f30eee5c1809dc5625e5fdbff9e88f069826 113749 rescue_1.23.tar.gz
 e903894e2ab46bff0bb3615d42d11c7e4f9050b0e213c9f0067c2046b45b460d 2360 rescue-check_1.23_all.udeb
 90ea88212783d220e8d2451684c7240ee2f6376d67574d777fc0e4158d966768 99670 rescue-mode_1.23_all.udeb
Files: 
 5d15f7ba4d12a66b4da7f72d059f7c67 1515 debian-installer optional rescue_1.23.dsc
 44a074f3088fabfd6f759cad03e620e9 113749 debian-installer optional rescue_1.23.tar.gz
 0e3145b0be061bb3e8670ae7f708c30c 2360 debian-installer standard rescue-check_1.23_all.udeb
 f1709fcb7c657f62ba01caab8112a046 99670 debian-installer optional rescue-mode_1.23_all.udeb
Package-Type: udeb

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--- End Message ---
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