show stopper for us: dev nbd0 clients locking up losing connection with server

[john]

Hi all,

I migrated one of our schools to Hardy on a 64 bit 4 core machine, 8
gigs ram, running a 32 bit image for ntavo 6030 series clients.


About 20% of my 40 workstations are going down on any given day. It
looks like they are losing there connection to the LTSP server
/var/log/messages has lots of stuff like:


Sep 12 10:34:44 192.168.0.248 kernel: [679871.904285] end_request: I/O
error, dev nbd0, sector 200126
Sep 12 10:34:44 192.168.0.248 kernel: [679871.904302] end_request: I/O
error, dev nbd0, sector 200128
Sep 12 10:34:44 192.168.0.248 kernel: [679871.904319] en Attempted
send on closed socket
Sep 12 10:34:44 192.168.0.248 kernel: [679871.912279] end_request: I/O
error, dev nbd0, sector 200132
Sep 12 10:34:44 192.168.0.248 kernel: [679871.912296] end_request: I/O
error, dev nbd0, sector 200134
Sep 12 10:34:44 192.168.0.248 kernel: [679871.912312] end_request: I/O
error, dev nbd0, sector 200136
Sep 12 10:34:44 192.168.0.248 kernel: [679871.912329] end_request: I/O
error, dev nbd0, sector 200138
Sep 12 10:34:44 192.168.0.248 kernel: [679871.912346] end_request: I/O
error, dev nbd0, sector 200140
Sep 12 10:34:44 192.168.0.248 kernel: [679871.912363] end_request: I/O
error, dev nbd0, sector 200142
Sep 12 10:34:44 192.168.0.248 kernel: [679871.912379] end_request: I/O error, de

the only "fix" is to hard reboot the client.

Kern.log looks this:

Sep 12 10:43:13 192.168.0.248 kernel: [680380.415783] nbd0: Attempted
send on closed socket
Sep 12 10:43:13 192.168.0.248 kernel: [680380.415788] end_request: I/O
error, dev nbd0, sector 200140
Sep 12 10:43:13 192.168.0.248 kernel: [680380.415799] nbd0: Attempted
send on closed socket
Sep 12 10:43:13 192.168.0.248 kernel: [680380.415804] end_request: I/O
error, dev nbd0, sector 200142
Sep 12 10:43:13 192.168.0.248 kernel: [680380.415816] nbd0: Attempted
send on closed socket
Sep 12 10:43:13 192.168.0.248 kernel: [680380.415821] end_request: I/O
error, dev nbd0, sector 200144
Sep 12 10:43:13 192.168.0.248 kernel: [680380.415833] nbd0: Attempted
send on closed socket
Sep 12 10:43:13 192.168.0.248 kernel: [680380.415838] end_request: I/O
error, dev nbd0, sector 200146
Sep 12 10:43:13 192.168.0.248 kernel: [680380.415850] nbd0: Attempted
send on closed socket
Sep 12 10:43:13 192.168.0.248 kernel: [680380.415855] end_request: I/O
error, dev nbd0, sector 200148


If I can't get this figured out soon, I am going to have to rebuild
the server back to 7.04 which was the last version that we used.


Any ideas are appreciated.

Thanks!

John