I tried to use dd if=/dev/zero bs=100 of=ControlPanel/test/foo and
ctrl+c'd it after a few seconds. 144M file appeared under windows but dd
hung completely. I couldn't even kill -9 the PID as root. I had to
reboot Ubuntu with shutdown -r now.

I'm getting in syslog:
Jul  2 11:00:58 ubuntu kernel: [  952.643403]  CIFS VFS: No response for cmd 50 
mid 2518
Jul  2 11:01:13 ubuntu kernel: [  967.721554]  CIFS VFS: server not responding
Jul  2 11:01:13 ubuntu kernel: [  967.722125]  CIFS VFS: No response for cmd 50 
mid 2647
Jul  2 11:01:13 ubuntu kernel: [  967.722873]  CIFS VFS: Unexpected lookup 
error -112

This could be a CIFS problem and nothing to do with Ubuntu of course. It
seems a little co-incidental that yesterday morning a kernel update come
in and since then the share has been unusably slow when trying to
operate phpunit.

I've just asked a colleague to mount this share from his XP machine - he
managed to copy a multi-megabyte file in without any delay.

-- 
cifs hangs with "Server not responding"
https://bugs.launchpad.net/bugs/600565
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