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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1217189

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: raring

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https://bugs.launchpad.net/bugs/1217189

Title:
  Buffer I/O error on device zram0 (possibly causing complete machine
  lockup)

Status in “linux” package in Ubuntu:
  Incomplete
Status in “linux-lts-raring” package in Ubuntu:
  Confirmed

Bug description:
  This is on linux-image-generic-lts-raring (which I recently upgraded
  to 3.8.0-29; the problem didn't occur before upgrading AFAIR)

  I see this junk in my dmesg when creating / formatting a zram swap,
  and then periodically. Then at some point after heavy swapping
  incidents, the machine locks up. "Correlation does not imply
  causation, but it does waggle its eyebrows suggestively" and all that.

  ---

  zram: module is from the staging directory, the quality is unknown, you have been warned.
  zram: num_devices not specified. Using default: 1
  zram: Creating 1 devices
  Adding 1031648k swap on /dev/zram0.  Priority:100 extents:1 across:1031648k SS
  ...
  Buffer I/O error on device zram0, logical block 257912 [repeated 10 times]
  ...
  BUG: scheduling while atomic: rsyslogd/1439/0x00000001
  Pid: 1439, comm: rsyslogd Tainted: PF       WC O 3.8.0-29-generic #42~precise1-Ubuntu
  [20931.796635] Pid: 1439, comm: rsyslogd Tainted: PF       WC O 3.8.0-29-generic #42~precise1-Ubuntu
  [20931.796638] Call Trace:
  [20931.796649]  [<c1619449>] __schedule_bug+0x52/0x5e
  [20931.796653]  [<c162c265>] __schedule+0x575/0x5f0
  [20931.796660]  [<f8439e06>] ? zram_make_request+0xe6/0x100 [zram]
  [20931.796666]  [<c111c38d>] ? release_pages+0x18d/0x1c0
  [20931.796669]  [<c162c573>] schedule+0x23/0x60
  [20931.796673]  [<c162d0fd>] rwsem_down_failed_common+0x9d/0xf0
  [20931.796677]  [<c162d162>] rwsem_down_write_failed+0x12/0x20
  [20931.796681]  [<c12f809a>] call_rwsem_down_write_failed+0x6/0x8
  [20931.796685]  [<c162ba44>] ? down_write+0x24/0x30
  [20931.796689]  [<f8439169>] zram_slot_free_notify+0x29/0x50 [zram]
  [20931.796693]  [<f8439140>] ? zram_stat64_inc+0x30/0x30 [zram]
  [20931.796700]  [<c11460bc>] swap_entry_free+0xdc/0x170
  [20931.796703]  [<c162d100>] ? rwsem_down_failed_common+0xa0/0xf0
  [20931.796708]  [<c1146458>] swap_free+0x28/0x40
  [20931.796712]  [<c1134ba0>] do_swap_page+0x390/0x6f0
  [20931.796717]  [<c10180f8>] ? sched_clock+0x8/0x10
  [20931.796721]  [<c11365aa>] handle_pte_fault+0x21a/0x2b0
  [20931.796726]  [<c10451e1>] ? kmap_atomic_prot+0xf1/0x120
  [20931.796730]  [<c113746a>] handle_mm_fault+0x1fa/0x2d0
  [20931.796735]  [<c1630ad0>] __do_page_fault+0x190/0x4f0
  [20931.796740]  [<c12f63bc>] ? sprintf+0x1c/0x20
  [20931.796744]  [<c104c132>] ? print_time.part.4+0x82/0xc0
  [20931.796748]  [<c1630e30>] ? __do_page_fault+0x4f0/0x4f0
  [20931.796752]  [<c1630e3d>] do_page_fault+0xd/0x10
  [20931.796756]  [<c162dc17>] error_code+0x67/0x6c
  [20931.796759]  [<c12f8716>] ? __copy_to_user_ll+0x46/0x70
  [20931.796763]  [<c12f8970>] copy_to_user+0x40/0x60
  [20931.796767]  [<c104e218>] syslog_print+0xc8/0x210
  [20931.796770]  [<c104eae6>] do_syslog+0x206/0x390
  [20931.796775]  [<c106d570>] ? add_wait_queue+0x50/0x50
  [20931.796780]  [<c11c3680>] ? kmsg_poll+0x50/0x50
  [20931.796784]  [<c11c36d0>] kmsg_read+0x50/0x60
  [20931.796788]  [<c11b6584>] proc_reg_read+0x64/0xa0
  [20931.796793]  [<c116469c>] vfs_read+0x8c/0x160
  [20931.796797]  [<c10a898d>] ? sys_futex+0xed/0x130
  [20931.796801]  [<c11b6520>] ? proc_reg_write+0xa0/0xa0
  [20931.796805]  [<c11647b7>] sys_read+0x47/0x80
  ...
  [30855.181542] Write-error on swap-device (251:0:131064)
  [43457.030155] Write-error on swap-device (251:0:131064)
  [43705.090381] Buffer I/O error on device zram0, logical block 16383

  Anyway, there's a couple of lkml messages related to this "Buffer I/O
  error on device zram0", please investigate

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.8.0-29-generic 3.8.0-29.42~precise1
  ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5
  Uname: Linux 3.8.0-29-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu17.4
  Architecture: i386
  Date: Tue Aug 27 07:33:37 2013
  EcryptfsInUse: Yes
  MarkForUpload: True
  ProcEnviron:
   TERM=rxvt
   LC_COLLATE=C
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-lts-raring
  UpgradeStatus: No upgrade log present (probably fresh install)

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