Dear Lasse,

Am 19.06.2014 06:08, schrieb Lasse R:
> Having used BackupPC 3 for years I've recently been trialling BackupPC 
> 4.0.0alpha3 and seem to keep hitting an issue with rsync_bpc segfaulting 
> while backing up. BackupPC is running on a fresh up to date Centos 6.5 
> x86_64 machine with base install. BackupPC is installed using instructions 
> found in the readme. This is a fresh install and not an upgrade, starting 
> off with an empty pool and the last run before triggering the problem on 
> the machine managed to back up 5GB of data before the segfault.
I run BackupPC 4.0.0alpha3 on Centos 6.5 (desktop mainboard, 4 GB RAM, 4
TB hard disk) with XFS.
> The segfault message is always similar. In dmesg I get:
> rsync_bpc[23851]: segfault at 7ff491592aa8 ip 0000000000448203 sp
> 00007fff12fa0790 error 4 in rsync_bpc[400000+74000]
>
> >From another machine:
> rsync_bpc[3361]: segfault at 7fbbe909eaa8 ip 0000000000448203 sp 
> 00007fff01c71e00 error 4 in rsync_bpc[400000+74000]
I checked the logs of the previous weeks and the only occurence I saw is

Apr 27 00:44:53 rhun kernel: INFO: task rsync_bpc:12201 blocked for more
than 120 seconds.
Apr 27 00:44:53 rhun kernel:      Not tainted 2.6.32-431.5.1.el6.x86_64 #1
Apr 27 00:44:53 rhun kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Apr 27 00:44:53 rhun kernel: rsync_bpc     D 0000000000000000     0
12201  12044 0x00000080
Apr 27 00:44:53 rhun kernel: ffff88010a4ddd28 0000000000000082
ffff88010a4ddcf8 ffffffff8122dab1
Apr 27 00:44:53 rhun kernel: ffff88010a4ddda8 ffffffffa03034cc
ffff88010a4ddda8 0000000000000058
Apr 27 00:44:53 rhun kernel: ffff880139d7e5f8 ffff88010a4ddfd8
000000000000fbc8 ffff880139d7e5f8
Apr 27 00:44:53 rhun kernel: Call Trace:
Apr 27 00:44:53 rhun kernel: [<ffffffff8122dab1>] ? avc_has_perm+0x71/0x90
Apr 27 00:44:53 rhun kernel: [<ffffffffa03034cc>] ?
xfs_iunlock+0x6c/0xd0 [xfs]
Apr 27 00:44:53 rhun kernel: [<ffffffff8109b5be>] ?
prepare_to_wait+0x4e/0x80
etc.


>
> Possible hardware and disk issues have been eliminated by having to swap
> servers and filesystems (not due to BackuPC). Both servers have had fresh 
> Centos 6.5 installed either with xfs or ext4 as the pool filesystem. I 
> might have to try another distro to see if this is Centos specific.

So you already tried it the hard way to rule out hardware problems
(rotten bits in RAM or the like).
>
> Anyway, I'm wondering if anyone else has ran into this and any ideas how 
> to further diagnose the problem?
I wonder if the "error in the rsync protocol data stream" is the result
or the cause of the segfault.

Did you try to backup machines with other versions of rsync at the
client side?

Sorry that I cannot help you better.

Best regards,
Boris

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