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

[Theodore Ts'o]

Was the crash repeatable?   It sounds like the drive went out to lunch
(since tune2fs -l failed), and the read errors may have caused e2fsck to
read bogus information which then caused it to crash.  It shouldn't have
crashed, of course, but it would be useful to know if that was what
happened.

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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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