Hi,

few days ago I've upgraded my box from openssh-5.9 to openssh-6.0 and
since then I've seen many hangs from backuppc (actually no full backup
was completed, e.g. still running after 24hours, usually it finishes
in ~ 3 hours - 60GB)

rsync --server was running fine (I was able to rsync whole disk with it)

perl process was stuck in select() call:

pid 5553: /usr/bin/perl /usr/bin/BackupPC_dump -v -f 127.0.0.1

# strace -p 5553
Process 5553 attached
select(16, [10], NULL, [10], NULL^CProcess 5553 detached

# gdb --pid=5553
(gdb) bt
#0  0x00007fb20ba3f6e3 in select () from /lib64/libc.so.6
#1  0x00007fb20cb69465 in Perl_pp_sselect () from /usr/lib64/libperl.so.5.14
#2  0x00007fb20cb1f306 in Perl_runops_standard () from
/usr/lib64/libperl.so.5.14
#3  0x00007fb20cac0d6a in perl_run () from /usr/lib64/libperl.so.5.14
#4  0x0000000000400e89 in main ()

Usually it rsynced 24MB to new backup, sometimes more, but e.g.
XferLogLevel and --verbose haven't changed that.

Looking at openssh changelog I suspect this 2 changes:
https://bugzilla.mindrot.org/show_bug.cgi?id=1859
https://bugzilla.mindrot.org/show_bug.cgi?id=1943
but it could be something completly different, but now after downgrade
back to 5.9 I've rsynced 2,7G to new sofar and it's still running.

I'll try to narrow this a bit more (even bisect openssh if needed),
but wanted to report it here asap so people don't need to debug perl
and other stuff like I did (not expecting openssh to be the cause). Or
maybe someone already knows about better work around with -W or
something which should be added to default BackupPC config..

Cheers,

------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
BackupPC-users mailing list
BackupPC-users AT lists.sourceforge DOT net
List:    https://lists.sourceforge.net/lists/listinfo/backuppc-users
Wiki:    http://backuppc.wiki.sourceforge.net
Project: http://backuppc.sourceforge.net/