[Lustre-discuss] lfs check servers hangs with LBUG

[jrs]

After disabling an OST with:

  lctl conf_param i3_lfs4-OST0005.osc.active=0

one of my clients now hangs when running:

samba01:~ # lfs check osts
i3_lfs4-OST0000-osc-ffff8101da370800 active.
i3_lfs4-OST0001-osc-ffff8101da370800 active.
i3_lfs4-OST0002-osc-ffff8101da370800 active.
i3_lfs4-OST0003-osc-ffff8101da370800 active.
i3_lfs4-OST0004-osc-ffff8101da370800 active.

The above has been running for 10 minutes.
The load on the machine has been driven up to 1.0
(it's a dual core box).

In /var/log/messages I see:

May 14 10:13:09 samba01 kernel: LustreError: 4006:0:(client.c:504:ptlrpc_import_delay_req()) @@@ Uninitialized import.  req at ffff8101e8648400 x
76/t0 o400->i3_lfs4-OST0005_UUID@<NULL>:6 lens 64/64 ref 1 fl Rpc:N/0/0 rc 0/0
May 14 10:13:09 samba01 kernel: LustreError: 4006:0:(client.c:506:ptlrpc_import_delay_req()) LBUG
May 14 10:13:09 samba01 kernel: Lustre: 4006:0:(linux-debug.c:168:libcfs_debug_dumpstack()) showing stack for process 4006
May 14 10:13:09 samba01 kernel: lfs           R  running task       0  4006   3872                     (NOTLB)
May 14 10:13:09 samba01 kernel: ffff8101e7e046c0 0000000000000086 ffff8101da36a780 ffff8101dd8cdb80
May 14 10:13:09 samba01 kernel:        0000000000000001 00007fffefa8395f ffffffff8837a29b 0000004b9300f2ed
May 14 10:13:09 samba01 kernel:        ffff8101dd8cdb80 0000000000000001
May 14 10:13:09 samba01 kernel: Call Trace: <ffffffff8837a29b>{:obdclass:lprocfs_fops_write+91}
May 14 10:13:09 samba01 kernel:        <ffffffff80181803>{vfs_write+215} <ffffffff80181dca>{sys_write+69}
May 14 10:13:09 samba01 kernel:        <ffffffff8010ad3e>{system_call+126}
May 14 10:13:09 samba01 kernel: LustreError: dumping log to /tmp/lustre-log.1210781589.4006


I've attached the referred to log file.

This might be the same bug as:
https://bugzilla.lustre.org/show_bug.cgi?id=12565

Is there any work around?

Thanks,
Johb

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