[Gluster-devel] difficult bug in 2.5 mainline

[Harris Landgarten]

Disabling posix-locks changes the problem

The client crashes along with the lock-server brick

Here is the bt from the client:

#0  unify_bg_cbk (frame=0xe080168, cookie=0xe1109c8, this=0x8057730, op_ret=0, op_errno=13) at unify.c:83
83          callcnt = --local->call_count;
(gdb) bt
#0  unify_bg_cbk (frame=0xe080168, cookie=0xe1109c8, this=0x8057730, op_ret=0, op_errno=13) at unify.c:83
#1  0xb75b96e5 in client_unlink_cbk (frame=0xe1109c8, args=0x8059248) at client-protocol.c:2969
#2  0xb75beff5 in notify (this=0x8057730, event=2, data=0x8095338) at client-protocol.c:4184
#3  0xb7f73827 in transport_notify (this=0x0, event=235405672) at transport.c:152
#4  0xb7f74299 in sys_epoll_iteration (ctx=0xbfb96248) at epoll.c:54
#5  0xb7f738fd in poll_iteration (ctx=0xbfb96248) at transport.c:260
#6  0x0804a170 in main (argc=6, argv=0xbfb96324) at glusterfs.c:341
(gdb) print local
$1 = (unify_local_t *) 0x0

Harris

----- Original Message -----
From: "Harris Landgarten" <harrisl at lhjonline.com>
To: "gluster-devel" <gluster-devel at nongnu.org>
Sent: Sunday, July 1, 2007 10:56:05 AM (GMT-0500) America/New_York
Subject: [Gluster-devel] difficult bug in 2.5 mainline

I am trying to track down a bug that is causing hangs in 2.5-patch-249 and all previous.

This happens during a full Zimbra backup of certain accounts to /mnt/glusterfs/backups

The first stage of the backup copies indexes and primary storage to /mnt/glusterfs/backups/tmp
All of this data resides in local storage and the writing to gluster is successful.

The next stage copies secondary storage to /mnt/glusterfs/backups/tmp
This fails in the following way:

Brick1 hangs with no errors
Brick2 hangs with no errors
Zimbra client hangs with no errors
second client loses connectivity

The second client bails after 2 min but cannot connect
The Zimbra client never bails

I then restart the bricks

After both bricks are restarted, the second client reconnects and a hung df -h completes

Zimbra client stays in a hung unconnected start

ls -l /mnt/glusterfs hangs

Only way is reset is

kill -9 pidof glusterfs
umount /mnt/glusterfs

glusterfs

Post mortem examination of /mnt/glusterfs/backups/tmp shows that a few files have the written from the secondary storage volume. I this can over 15,000 files should have been written.

Note: this only happen with large email boxed with some large >10M files.

Note: with patch-247 the zimbra client would seqfault. With 249 it just hangs in unrecoverable state.


Harris


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