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    Subjectxfs hang on 2.6.39-rc5
    On two different hosts, both running 2.6.39-rc5-00123-g33b6c92, xfs 
    seems to be locking up.

    I had to revert the box from the second trace but this trace is mounted
    with:

    UUID=dcdc849e-bad8-4971-935c-223819a6dcc4 /
    xfs noatime 0 1

    which ends up being:

    /dev/sdb3 on / type xfs (rw,noatime,delaylog,noquota)

    meta-data=/dev/sdb3 isize=256 agcount=16, agsize=601056 blks
    = sectsz=512 attr=0
    data = bsize=4096 blocks=9616896, imaxpct=25
    = sunit=0 swidth=0 blks
    naming =version 2 bsize=4096 ascii-ci=0
    log =internal bsize=4096 blocks=4695, version=1
    = sectsz=512 sunit=0 blks, lazy-count=0
    realtime =none extsz=65536 blocks=0, rtextents=0

    [38160.536046] INFO: task multilog:7586 blocked for more than 120 seconds.
    [38160.536052] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
    disables this message.
    [38160.536059] multilog D 0012cfae 0 7586 7578 0x00000000
    [38160.536069] f5bcfd18 00000086 f9a4653a 0012cfae f9a33b34 00000024
    6d783c2f 0000227f
    [38160.536082] f5bcfcc8 f5bcfcd8 00000000 00000000 f5bcfd18 f5c91810
    f5c91810 00000024
    [38160.536092] 00d2e530 f1fd2e40 00001460 00dc5000 f5c1b780 0000695d
    00000000 f5bcfd18
    [38160.536103] Call Trace:
    [38160.536188] [<f9a4653a>] ? kmem_alloc+0x51/0xbe [xfs]
    [38160.536212] [<f9a33b34>] ? xlog_space_left+0x24/0xa9 [xfs]
    [38160.536237] [<f9a34644>] ? xlog_grant_push_ail+0xb8/0xdc [xfs]
    [38160.536262] [<f9a34c8f>] xlog_grant_log_space+0x173/0x42a [xfs]
    [38160.536277] [<c1028b95>] ? try_to_wake_up+0xd4/0xd4
    [38160.536302] [<f9a34ff1>] xfs_log_reserve+0xab/0xfe [xfs]
    [38160.536329] [<f9a40a20>] xfs_trans_reserve+0x74/0x1cb [xfs]
    [38160.536357] [<f9a3de78>] xfs_rename+0x122/0x61a [xfs]
    [38160.536367] [<c10bbd13>] ? link_path_walk+0x2de/0x77b
    [38160.536375] [<c10bae07>] ? generic_permission+0x1a/0x95
    [38160.536398] [<f9a4ee3e>] xfs_vn_rename+0x60/0x6a [xfs]
    [38160.536407] [<c10bd680>] vfs_rename+0x313/0x350
    [38160.536415] [<c10c290a>] ? d_lookup+0x1e/0x3d
    [38160.536422] [<c10be874>] sys_renameat+0x203/0x219
    [38160.536431] [<c10c889e>] ? mntput+0x13/0x1f
    [38160.536437] [<c10b4bfd>] ? fput+0x118/0x1b0
    [38160.536443] [<c10be8b2>] sys_rename+0x28/0x2a
    [38160.536451] [<c12db698>] sysenter_do_call+0x12/0x28



    [94440.552055] INFO: task nfsd:8055 blocked for more than 120 seconds.
    [94440.553587] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
    disables this message.
    [94440.556638] nfsd D df5df880 0 8055 2 0x00000000
    [94440.558258] d6fb3d78 00000046 d6941c90 df5df880 df2b1400 df5df8c0
    5a0961bd 000055be
    [94440.561634] d6fb3d28 03f35714 00014f61 00000000 d6fb3d78 d6fae370
    d6fae370 ffffff8c
    [94440.565246] d6941cdc d6fb3d48 c10c4aa8 cb5aea80 cb918000 0004e83b
    cb918201 e21adb34
    [94440.569039] Call Trace:
    [94440.570871] [<c10c4aa8>] ? d_obtain_alias+0x3e/0xe6
    [94440.572813] [<e21adb34>] ? xlog_space_left+0x24/0xa9 [xfs]
    [94440.574708] [<e21aec08>] xlog_grant_log_space+0xec/0x42a [xfs]
    [94440.576622] [<e21ae644>] ? xlog_grant_push_ail+0xb8/0xdc [xfs]
    [94440.578509] [<c1028b95>] ? try_to_wake_up+0xd4/0xd4
    [94440.580451] [<e21aeff1>] xfs_log_reserve+0xab/0xfe [xfs]
    [94440.582391] [<e21baa20>] xfs_trans_reserve+0x74/0x1cb [xfs]
    [94440.584353] [<e21bdd48>] xfs_remove+0xd9/0x333 [xfs]
    [94440.586270] [<c10bad79>] ? acl_permission_check+0x1b/0x8f
    [94440.588209] [<c10bae07>] ? generic_permission+0x1a/0x95
    [94440.590152] [<e21c9079>] xfs_vn_unlink+0x30/0x6a [xfs]
    [94440.592083] [<c10bd2f7>] vfs_unlink+0x60/0xae
    [94440.594006] [<e1ebf9c5>] nfsd_unlink+0x19e/0x21b [nfsd]
    [94440.595943] [<e1ecae80>] ? nfsd4_encode_operation+0x56/0x161 [nfsd]
    [94440.597911] [<e1ec92a8>] nfsd4_remove+0x3e/0x114 [nfsd]
    [94440.599878] [<e1ec96f3>] nfsd4_proc_compound+0x334/0x3e9 [nfsd]
    [94440.601853] [<e1ecbcc7>] ? nfsd4_decode_getattr+0x8/0xa [nfsd]
    [94440.603832] [<e1ecfdb1>] ? nfs4svc_decode_compoundargs+0x268/0x342
    [nfsd]
    [94440.605851] [<e1ec926a>] ? nfsd4_rename+0x1e0/0x1e0 [nfsd]
    [94440.607826] [<e1ebc2be>] nfsd_dispatch+0xbc/0x1e9 [nfsd]
    [94440.609794] [<e1f81f2b>] svc_process+0x401/0x740 [sunrpc]
    [94440.611715] [<e1ebc8a4>] nfsd+0xae/0x130 [nfsd]
    [94440.613620] [<e1ebc7f6>] ? nfsd_svc+0x197/0x197 [nfsd]
    [94440.615495] [<e1ebc7f6>] ? nfsd_svc+0x197/0x197 [nfsd]
    [94440.617277] [<c1043c01>] kthread+0x67/0x69
    [94440.618996] [<c1043b9a>] ? kthreadd+0xa3/0xa3
    [94440.620641] [<c12dbc36>] kernel_thread_helper+0x6/0xd


    Doug



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