Hi all

I'm testing 2.6.23-rc9-git1 on my old home server
Trying to reorganizer my xfs filesystem with xfs_fsr cause a sort of system
hang
In particular all I/O write on this filesystem hang process in D state but
not seems to have problem on read I/O (I can login via ssh to machine but
not logout for example)
I can realibly create this situation running a different job that stress
filesystem during xfs_fsr (in this case make distclean on a kernel build
directory)
Strange enough on every hang there was this message on kernel log

possible SYN flooding on port 4664. Sending cookies.

port 4664 is in use by mldonkey

disk layout 

xfs on lvm2 on [sw raid5 + sw raid1] on 4 sata disk
2 sata disk on ata_piix
2 sata disk on sata_promise

distribution is ubuntu dapper with this tools

Gnu C                  4.0.3
Gnu make               3.81beta4
binutils               2.16.91
util-linux             2.12r
mount                  2.12r
module-init-tools      3.2.2
e2fsprogs              1.38
jfsutils               1.1.8
reiserfsprogs          3.6.19
xfsprogs               2.7.7
PPP                    2.4.4b1
Linux C Library        3.6
Dynamic linker (ldd)   2.3.6
Procps                 3.2.6
Net-tools              1.60
Console-tools          0.2.3
Sh-utils               5.93
udev                   079

attached some info + trace of running process during hang