[Bug 1194234] Re: fsck.ext4 crashes with a segfault

[Forest]

>From memory, I'm pretty sure the crashes happened more than once on the
same drive and (corrupt) file system, though I don't remember whether
the segv was in the same place.   Unfortunately, the drive is no longer
available to me for testing.  I have another one like it, though, and if
the same problem appears I'll post details here.

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Title:
  fsck.ext4 crashes with a segfault

Status in “e2fsprogs” package in Ubuntu:
  Confirmed

Bug description:
  I was attempting to fix the filesystem on a sata drive when fsck.ext4
  crashed.

  My command line:

  sudo fsck.ext4 -vy /dev/sdd1

  Last bit of output from fsck.ext4:

  Unconnected directory inode 108960241 (/???)
  Connect to /lost+found? yes
  Pass 3A: Optimizing directories
  Signal (11) SIGSEGV si_code=SI_KERNEL fault addr=(nil)
  fsck.ext4[0x426f30]
  /lib/x86_64-linux-gnu/libc.so.6(+0x370b0)[0x7f0de29bb0b0]
  fsck.ext4[0x4233e2]
  /lib/x86_64-linux-gnu/libc.so.6(+0x3aa18)[0x7f0de29bea18]
  /lib/x86_64-linux-gnu/libc.so.6(qsort_r+0x223)[0x7f0de29bf5f3]
  fsck.ext4(e2fsck_rehash_dir+0x281)[0x4238e1]
  fsck.ext4(e2fsck_rehash_directories+0x11e)[0x42457e]
  fsck.ext4(e2fsck_pass3+0x616)[0x4197f6]
  fsck.ext4(e2fsck_run+0x57)[0x40dd97]
  fsck.ext4(main+0xd3c)[0x40a05c]
  /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x7f0de29a5ea5]
  fsck.ext4[0x40bc61]

  My first attempt to dump the superblock contents failed:

  $ sudo tune2fs -l /dev/sdd1
  tune2fs 1.42.5 (29-Jul-2012)
  tune2fs: Attempt to read block from filesystem resulted in short read while trying to open /dev/sdd1
  Couldn't find valid filesystem superblock.

  After power cycling the drive, tune2fs worked again:

  $ sudo tune2fs -l /dev/sdd1
  tune2fs 1.42.5 (29-Jul-2012)
  Filesystem volume name:   slab
  Last mounted on:          <not available>
  Filesystem UUID:          8ce4423d-9bd7-44e3-8096-1dd3f53f9b79
  Filesystem magic number:  0xEF53
  Filesystem revision #:    1 (dynamic)
  Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
  Filesystem flags:         unsigned_directory_hash 
  Default mount options:    (none)
  Filesystem state:         not clean with errors
  Errors behavior:          Continue
  Filesystem OS type:       Linux
  Inode count:              122101760
  Block count:              488378636
  Reserved block count:     4883786
  Free blocks:              480665217
  Free inodes:              122101749
  First block:              0
  Block size:               4096
  Fragment size:            4096
  Reserved GDT blocks:      907
  Blocks per group:         32768
  Fragments per group:      32768
  Inodes per group:         8192
  Inode blocks per group:   512
  Flex block group size:    16
  Filesystem created:       Sat Jun  4 00:32:07 2011
  Last mount time:          n/a
  Last write time:          Sun Jun 23 20:07:07 2013
  Mount count:              0
  Maximum mount count:      22
  Last checked:             Sat Jun  4 00:32:07 2011
  Check interval:           15552000 (6 months)
  Next check after:         Wed Nov 30 23:32:07 2011
  Lifetime writes:          30 GB
  Reserved blocks uid:      0 (user root)
  Reserved blocks gid:      0 (group root)
  First inode:              11
  Inode size:	          256
  Required extra isize:     28
  Desired extra isize:      28
  Journal inode:            8
  Default directory hash:   half_md4
  Directory Hash Seed:      03c936fa-47a9-41dd-ae28-cf6c92b02910
  Journal backup:           inode blocks

  $ uname -a
  Linux ocelot 3.8.0-25-generic #37-Ubuntu SMP Thu Jun 6 20:47:07 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 13.04
  Release:	13.04
  Codename:	raring

  The drive is a Seagate Barracuda Green, model ST2000DL003-9VT166

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