[Bug 1321418] [NEW] fsck.ext4 fails to fix multiply-claimed blocks: can't find dup_blk

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Seyeong Kim (xtrusia):

[SRU justification]

[Impact]

The last few times my root ext4 filesystem had its regularly-scheduled
boot-time check, errors were reported. The first time it happened, I
simply told the system to fix the errors, but since they kept coming up
again, I decided to look more closely. I booted from a live USB drive,
assembled my raid partitions, and ran fsck.ext4 manually.

Without any options, fsck.ext4 simply reported that the filesystem was
clean, and exited. Things got more interesting when I ran with -f. It
reported several multiply-claimed blocks, and when I told fsck to go
ahead and clone them, it failed with an internal error. Repeated runs of
fsck revealed that the filesystem was still not fixed, and repeated
attempts to fix the problem also failed, reporting that multiply-claimed
blocks already reassigned or cloned.

I was lucky in that the files in question were unimportant, so deleting
one of them and running fsck again seems to have fixed my problem this
time. However, fsck's internal error and failure to fix the problem in
the first place is worrisome.

[Test Case]

Here's the full output:

$ sudo fsck.ext4 -f /dev/md/1
e2fsck 1.42.8 (20-Jun-2013)
Pass 1: Checking inodes, blocks, and sizes

Running additional passes to resolve blocks claimed by more than one inode...
Pass 1B: Rescanning for multiply-claimed blocks
Multiply-claimed block(s) in inode 27528089: 73467268 9287 9288 9289 9290 9291
9292 9293
Multiply-claimed block(s) in inode 27528105: 73467268 9287 9288 9289 9290 9291
9292 9293
Pass 1C: Scanning directories for inodes with multiply-claimed blocks Pass 1D:
Reconciling multiply-claimed blocks
(There are 2 inodes containing multiply-claimed blocks.)

File
/home/user/dir/subdir/05.09.2013_13.15.48.300.jpg
(inode #27528089, mod time Mon Jan 13 02:50:08 2014)
  has 7 multiply-claimed block(s), shared with 1 file(s):
        /home/user/.thumbnails/normal/51048a1138d61df87bf3fdc7deed50e3.png/WebpageIcons.db
(inode #27528105, mod time Mon Jan 13 02:50:08 2014)
Clone multiply-claimed blocks<y>? yes
clone_file_block: internal error: can't find dup_blk for 73467268

clone_file_block: internal error: can't find dup_blk for 73467268

File
/home/user/.thumbnails/normal/51048a1138d61df87bf3fdc7deed50e3.png/WebpageIcons.db
(inode #27528105, mod time Mon Jan 13 02:50:08 2014)
  has 7 multiply-claimed block(s), shared with 1 file(s):
        /home/user/dir/subdir/05.09.2013_13.15.48.300.jpg
(inode #27528089, mod time Mon Jan 13 02:50:08 2014)
Multiply-claimed blocks already reassigned or cloned.

Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

root: ***** FILE SYSTEM WAS MODIFIED *****
root: 1038356/30285824 files (0.3% non-contiguous), 106319516/121119454 blocks

[Regression Potential]

[Other Info]

backported from upstream
https://kernel.googlesource.com/pub/scm/fs/ext2/e2fsprogs/+/9a1d614df217c02ea6b2cb0072fccfe706aea111
https://kernel.googlesource.com/pub/scm/fs/ext2/e2fsprogs/+/84397754250d13e8596dd68c157c4c9863800079%5E%21/#F0

** Affects: e2fsprogs (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: e2fsprogs (Ubuntu Precise)
     Importance: Undecided
     Assignee: Seyeong Kim (xtrusia)
         Status: In Progress

** Affects: e2fsprogs (Ubuntu Trusty)
     Importance: Undecided
     Assignee: Seyeong Kim (xtrusia)
         Status: In Progress


** Tags: sts
-- 
fsck.ext4 fails to fix multiply-claimed blocks: can't find dup_blk
https://bugs.launchpad.net/bugs/1321418
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