linux-ext4 - (resend) extent header problems following shrink with resize2fs

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Date:	Tue, 23 Dec 2008 18:49:15 +1300
From:	Paul Collins <paul@...ly.ondioline.org>
To:	linux-ext4@...r.kernel.org
Subject: (resend) extent header problems following shrink with resize2fs

(resending without gipped attachment)

Running Linux 2.6.28-rc9 as of ab65387243f47a7bc11725f733c86bf27248b326.
e2fsprogs 1.41.3-1 from Debian.

Yesterday I created a ~464GB ext4 volume and copied about 107GB of music
files onto it.  Then I decided that I wanted to use half of the disk for
something else, so last night I resized the ext4 filesystem to ~232GB
and recreated the partitions to suit.  This morning I wrote some new
files to the ext4 filesystem, which went fine.  Then I installed a new
music player, which wanted to scan all of the files on the disk.  It
reported being unable to read some files, and there's rather a lot of
this sort of thing in dmesg (see also http://ondioline.org/~paul/e4dmesg.gz):

EXT4-fs error (device sdb1): ext4_ext_find_extent: bad header in inode #39565: invalid magic - magic 24e, entries 28338, max 21313(0), depth 28712(0)
EXT4-fs error (device sdb1): ext4_ext_find_extent: bad header in inode #39555: invalid magic - magic cd8c, entries 59560, max 57082(0), depth 5425(0)
EXT4-fs error (device sdb1): ext4_ext_find_extent: bad header in inode #39563: invalid magic - magic 976d, entries 52325, max 49256(0), depth 50316(0)
EXT4-fs error (device sdb1): ext4_ext_find_extent: bad header in inode #39556: invalid magic - magic 61c6, entries 47990, max 4668(0), depth 32768(0)
EXT4-fs error (device sdb1): ext4_ext_find_extent: bad header in inode #44888: invalid magic - magic 42a, entries 5388, max 32960(0), depth 1872(0)
EXT4-fs error (device sdb1): ext4_ext_find_extent: bad header in inode #39844: invalid magic - magic 6ae8, entries 44073, max 20807(0), depth 10869(0)
EXT4-fs error (device sdb1): ext4_ext_find_extent: bad header in inode #39843: invalid magic - magic 2200, entries 38282, max 17931(0), depth 0(0)

There are no "access beyond end of partition" messages, so I don't think
I screwed up the resize procedure.  The argument I gave resizefs was
"244192000K"; here's the partition table:

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       30401   244196001   83  Linux
/dev/sdb2           30402       60801   244188000   83  Linux


e2fsck aborts when I try to use it fix the filesystem:

        /dev/sdb1 contains a file system with errors, check forced.
        Pass 1: Checking inodes, blocks, and sizes
        Error1: Corrupt extent header on inode 38979
        [New Thread 0x7fe15e066740 (LWP 24166)]

        Program received signal SIGABRT, Aborted.
        [Switching to Thread 0x7fe15e066740 (LWP 24166)]
        0x00007fe15d0fbed5 in raise () from /lib/libc.so.6
        (gdb) bt
        #0  0x00007fe15d0fbed5 in raise () from /lib/libc.so.6
        #1  0x00007fe15d0fd3f3 in abort () from /lib/libc.so.6
        #2  0x000000000040bdae in scan_extent_node (ctx=0x24c6f70, 
            pctx=0x7fff6607c7a0, pb=0x7fff6607c5f0, start_block=0, ehandle=0x2ed94d0)
            at /build/buildd/e2fsprogs-1.41.3/e2fsck/pass1.c:1700
        #3  0x000000000040cc1d in check_blocks (ctx=0x24c6f70, pctx=0x7fff6607c7a0, 
            block_buf=0x2ec11a0 "�002")
            at /build/buildd/e2fsprogs-1.41.3/e2fsck/pass1.c:1773
        #4  0x000000000040e063 in e2fsck_pass1 (ctx=0x24c6f70)
            at /build/buildd/e2fsprogs-1.41.3/e2fsck/pass1.c:1030
        #5  0x00000000004089e8 in e2fsck_run (ctx=0x24c6f70)
            at /build/buildd/e2fsprogs-1.41.3/e2fsck/e2fsck.c:215
        #6  0x00000000004074a3 in main (argc=<value optimized out>, 
            argv=<value optimized out>)
            at /build/buildd/e2fsprogs-1.41.3/e2fsck/unix.c:1278

and e2image exits with:

        e2image: Corrupt extent header while iterating over inode 38979

In the matter of inode 38979, debugfs says:

        debugfs:  bmap <38979> 0
        argv[0]: Corrupt extent header while mapping logical block 0


I can keep the FS around so let me know if you need any more
information.

-- 
Paul Collins
Wellington, New Zealand

Dag vijandelijk luchtschip de huismeester is dood
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