Ubuntu

mdadm seg faults when forced to assemble array

Reported by bexamous on 2008-10-13
20
This bug affects 1 person
Affects Status Importance Assigned to Milestone
mdadm (Debian)
Fix Released
Unknown
mdadm (Ubuntu)
Critical
Dustin Kirkland 

Bug Description

Binary package hint: mdadm

Trying to force array to assemble causes mdadm to seg fault.

Eg:
bexamous@nine:~$ sudo mdadm -A -f /dev/md3 /dev/sdb3 /dev/sdc3 /dev/sde3 /dev/sdf3 /dev/sdg3 /dev/sdh3
mdadm: forcing event count in /dev/sdb3(0) from 93274 upto 93278
Segmentation fault (core dumped)

This is with mdadm version 2.6.7-3ubuntu7

Found same exact problem reported here:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=499643

bexamous (bexamous) wrote :

http://neil.brown.name/git?p=mdadm;a=commitdiff;h=60b435db5a7b085ad1204168879037bf14ebd6d1

BTW this patch fixes issue.

Before:
bexamous@nine:~$ sudo mdadm -A -f /dev/md3 /dev/sdb3 /dev/sdc3 /dev/sde3 /dev/sdf3 /dev/sdg3 /dev/sdh3
mdadm: forcing event count in /dev/sdb3(0) from 93274 upto 93278
Segmentation fault (core dumped)

After:
bexamous@nine:~$ sudo mdadm -v -A -f --run /dev/md3 /dev/sdb3 /dev/sdc3 /dev/sde3 /dev/sdf3 /dev/sdg3 /dev/sdh3
mdadm: looking for devices for /dev/md3
mdadm: /dev/sdb3 is identified as a member of /dev/md3, slot 0.
mdadm: /dev/sdc3 is identified as a member of /dev/md3, slot 1.
mdadm: /dev/sde3 is identified as a member of /dev/md3, slot 2.
mdadm: /dev/sdf3 is identified as a member of /dev/md3, slot 3.
mdadm: /dev/sdg3 is identified as a member of /dev/md3, slot 4.
mdadm: /dev/sdh3 is identified as a member of /dev/md3, slot 5.
mdadm: forcing event count in /dev/sdb3(0) from 93274 upto 93278
mdadm: forcing event count in /dev/sdc3(1) from 93274 upto 93278
mdadm: forcing event count in /dev/sde3(2) from 93274 upto 93278
mdadm: added /dev/sdc3 to /dev/md3 as 1
mdadm: added /dev/sde3 to /dev/md3 as 2
mdadm: added /dev/sdf3 to /dev/md3 as 3
mdadm: added /dev/sdg3 to /dev/md3 as 4
mdadm: added /dev/sdh3 to /dev/md3 as 5
mdadm: no uptodate device for slot 6 of /dev/md3
mdadm: added /dev/sdb3 to /dev/md3 as 0
mdadm: /dev/md3 has been started with 6 drives (out of 7).

Changed in mdadm:
assignee: nobody → kirkland
importance: Undecided → Critical
status: New → Triaged
Launchpad Janitor (janitor) wrote :
Download full text (3.4 KiB)

This bug was fixed in the package mdadm - 2.6.7.1-1ubuntu1

---------------
mdadm (2.6.7.1-1ubuntu1) jaunty; urgency=low

  * This merge should solve the critical bug: LP: #282492.
  * Merge from debian unstable, remaining changes:
   * config.c, Assemble.c: retrieve the returned value from asprintf,
     and assert; should prevent mdadm from segfaulting if there is not enough
     memory available; Debian Bug #509167.
   * debian/README.initramfs-transition, debian/README.upgrading-2.5.3,
     debian/README.Debian: drop Debian-specific documentation.
   * debian/mkconf: initialize variable.
   * debian/mdadm-startall, debian/mdadm-startall.8, debian/mdadm.links,
     debian/mdadm.manpages, debian/mdadm-startall.sgm: dropped, not used
     in Ubuntu (thus dropping the build-dep on docbook-to-man).
   * debian/mdadm.preinst, debian/mdadm.udev: udev enablement, remove the
     Debian init script.
   * debian/mdadm.templates, debian/mdadm-udeb.templates: Ubuntu puts the
     debconf template questions in the udeb.
   * debian/mdadm.postrm: drop warnings in the initramfs update.
   * debian/mdadm.postinst, debian/mdadm.config, initramfs/init-premount:
     boot-degraded enablement; maintain udev starting of RAID devices;
     init-premount hook script for the initramfs, to provide information
     at boot.
   * debian/mdadm-udeb.dirs: udeb packaging for installer.
   * debian/mdadm.dirs: install init-premount script.
   * debian/control: maintainer updates, no need for docbook since we dropped
     the manpages that needed it, we need specific udev and initramfs-tools
     versions that don't ship 'mdrun'.
   * debian/mdadm-raid: drop, since we have a udev rule that automatically
     runs "mdadm --assemble --scan --no-degraded", activating any non-degraded
     device as their components are detected.
   * debian/rules: account for the various installation differences of the
     documentation, udev rules, the udeb, initramfs premount script, udeb
     templates and translation thereof.
   * debian/initramfs/hook: massively simplified by udev.
   * debian/install-rc, check.d/_numbers, check.d/root_on_raid: Ubuntu partman
     installer changes.

mdadm (2.6.7.1-1) unstable; urgency=low

  * New upstream release, specifically created for Debian lenny to fix the RC
    bugs, which
    - fixes typo in forced assembly code (closes: #496334, #499643, #498505).
    - fixes array component size detection (closes: 500309).
    Thanks Neil Brown, mdadm upstream: you are spoiling me. :)

  * Minor fixes to documentation:
    - Add David Pashley's Rebuilding RAID blog post.
    - Add new (bugfix) version 1.40 of the newdisk script
      (/usr/share/doc/mdadm/examples/newdisk.gz) (closes: #490955).
    - Add link to Warren Togami's writeup about remote RAID-1 conversion to
      README.recipes.
    - Fix probability of survival in FAQ 4b, since I erroneously labeled the
      chance of failure as the chance of survival; thanks to Per Olofssen for
      clarification (closes: #493577).
    - Cherry-picked 6d6de2e from Neil, which adds HOMEHOST to the manpage and
      closes: #489257.

mdadm (2.6.7-3.1) unstable; urgency=low

  * Non-maintainer upload with pe...

Read more...

Changed in mdadm:
status: Triaged → Fix Released
Changed in mdadm:
status: Unknown → Fix Released
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