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Re: xfs_repair never finishes on lvm partition

To: xfs@xxxxxxxxxxx
Subject: Re: xfs_repair never finishes on lvm partition
From: Ion Badulescu <ib-xfs@xxxxxxxxxx>
Date: Wed, 22 Jun 2011 11:32:01 -0400 (EDT)
User-agent: Alpine 2.00 (LRH 1167 2008-08-23)
Hello,

Sorry for highjacking this old thread from last year. I actually ran into the same situation as the original poster, using xfsprogs-3.1.5 on kernel 2.6.38.7. Using xfs_repair -P fixed the issue, and I also managed to get a metadump before repairing it so you guys can take a look and maybe fix the prefetch mode.

The strace of the xfs_repair, for what it's worth, seems to show a complete deadlock with all threads waiting on futexes:

# strace -f -F -p 8315
Process 8374 attached with 6 threads - interrupt to quit
[pid  8374] futex(0x7f2336d20a84, FUTEX_WAIT, 4, NULL <unfinished ...>
[pid  8373] futex(0x7f2336d20a84, FUTEX_WAIT, 3, NULL) = -1 EAGAIN (Resource 
temporarily unavailable)
[pid  8372] futex(0x7f2336d20a84, FUTEX_WAIT, 2, NULL <unfinished ...>
[pid  8373] futex(0x7f2336d20a84, FUTEX_WAIT, 4, NULL <unfinished ...>
[pid  8372] <... futex resumed> )       = -1 EAGAIN (Resource temporarily 
unavailable)
[pid  8372] futex(0x7f2336d20a84, FUTEX_WAIT, 4, NULL <unfinished ...>
[pid  8371] futex(0x7f2336d20a84, FUTEX_WAIT, 1, NULL) = -1 EAGAIN (Resource 
temporarily unavailable)
[pid  8370] futex(0x7f2336d20b08, FUTEX_WAIT, 0, NULL <unfinished ...>
[pid  8371] futex(0x7f2336d20a84, FUTEX_WAIT, 4, NULL <unfinished ...>
[pid  8315] futex(0x7f2336d1f958, FUTEX_WAIT, 2, NULL^C <unfinished ...>
Process 8315 detached
Process 8370 detached
Process 8371 detached
Process 8372 detached
Process 8373 detached
Process 8374 detached

The metadump is 4.2GB, off of a 2.2TB filesystem. If there are interested parties, I can arrange to put online somewhere for an http download.

Thanks,
-Ion

--
  It is better to keep your mouth shut and be thought a fool,
            than to open it and remove all doubt.

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