Possible corruption of array metadata on shutdown

[Luis Henriques]

== Precise SRU Justification ==

Commit c744a65c1e2d59acc54333ce8 introduced the possibility of array
metadata be corrupted. This commit has reached precise through stable
kernel updates. The fix is already available upstreams in commit
30b8aa9172dfeaac6d77897c67ee9f9fc574cdbb (3.4-rc1) but is not
available in stable yet.

== Fix ==

Commit 30b8aa9172dfeaac6d77897c67ee9f9fc574cdbb fixes this issue.

== Impact ==

The issue has been reported here
http://thread.gmane.org/gmane.linux.raid/38151 and the impact may be
high as it can cause severe data loss.

== Test Case ==

From the fix description:

    "If, when md_notify_reboot gets the mddev lock, the array is
    in a state where it is assembled but hasn't been started (as can
    happen if the personality module is not available, or in other unusual
    situations), then incorrect metadata will be written out making it
    impossible to re-assemble the array."

[Luis Henriques (henrix)]

This was a clean cherry-pick from upstream, and should be hitting the stable tree soon. Thus, marking the bug as verified.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.2.0-24.38

---------------
linux (3.2.0-24.38) precise-proposed; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #991925

  [ Herton Ronaldo Krzesinski ]

  * linux: add Build-Depends for libnewt-dev, to enable perf TUI support
    - LP: #981717

  [ Tim Gardner ]

  * SAUCE: Allow filtering of cpufreq drivers
    - LP: #984288

  [ Upstream Kernel Changes ]

  * x86 bpf_jit: fix a bug in emitting the 16-bit immediate operand of AND
    - LP: #981162
  * tg3: Fix 5717 serdes powerdown problem
    - LP: #981162
  * sky2: dont overwrite settings for PHY Quick link
    - LP: #981162
  * rose_dev: fix memcpy-bug in rose_set_mac_address
    - LP: #981162
  * net: usb: cdc_eem: fix mtu
    - LP: #981162
  * Fix non TBI PHY access; a bad merge undid bug fix in a previous commit.
    - LP: #981162
  * ASoC: wm8994: Update WM8994 DCS calibration
    - LP: #981162
  * mtd: ixp4xx: oops in ixp4xx_flash_probe
    - LP: #981162
  * mtd: mips: lantiq: reintroduce support for cmdline partitions
    - LP: #981162
  * mtd: nand: gpmi: use correct member for checking NAND_BBT_USE_FLASH
    - LP: #981162
  * mtd: sst25l: initialize writebufsize
    - LP: #981162
  * mtd: block2mtd: initialize writebufsize
    - LP: #981162
  * mtd: lart: initialize writebufsize
    - LP: #981162
  * mtd: m25p80: set writebufsize
    - LP: #981162
  * ACPI: Do cpufreq clamping for throttling per package v2
    - LP: #981162
  * PNPACPI: Fix device ref leaking in acpi_pnp_match
    - LP: #981162
  * modpost: fix ALL_INIT_DATA_SECTIONS
    - LP: #981162
  * genirq: Adjust irq thread affinity on IRQ_SET_MASK_OK_NOCOPY return
    value
    - LP: #981162
  * tracing: Fix ftrace stack trace entries
    - LP: #981162
  * tracing: Fix ent_size in trace output
    - LP: #981162
  * m68k/mac: Add missing platform check before registering platform
    devices
    - LP: #981162
  * mac80211: fix possible tid_rx->reorder_timer use after free
    - LP: #981162
  * rtlwifi: rtl8192ce: rtl8192cu: rtl8192de: Fix low-gain setting when
    scanning
    - LP: #981162
  * drm: Validate requested virtual size against allocated fb size
    - LP: #981162
  * drm/radeon/kms: fix fans after resume
    - LP: #981162
  * drm/i915: no-lvds quirk on MSI DC500
    - LP: #981162
  * drm/i915: Add lock on drm_helper_resume_force_mode
    - LP: #981162
  * drm/i915: quirk away broken OpRegion VBT
    - LP: #981162
  * r8169: runtime resume before shutdown.
    - LP: #981162
  * target: Fix unsupported WRITE_SAME sense payload
    - LP: #981162
  * kgdb,debug_core: pass the breakpoint struct instead of address and
    memory
    - LP: #981162
  * kgdbts: Fix kernel oops with CONFIG_DEBUG_RODATA
    - LP: #981162
  * kgdbts: (1 of 2) fix single step awareness to work correctly with SMP
    - LP: #981162
  * kgdbts: (2 of 2) fix single step awareness to work correctly with SMP
    - LP: #981162
  * x86,kgdb: Fix DEBUG_RODATA limitation using text_poke()
    - LP: #981162
  * CIFS: Fix VFS lock usage for oplocked files
    - LP: #981162
  * ARM: tegra: remove Tegra30 errata from MACH_TEGRA_DT
    - LP: #981162
  * mmc: sdhci-dove: Fix compile error by...

[Adam Conrad (adconrad)]

The verification of this Stable Release Update has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regresssions.