Re: [Nbd] nbd-server hanging issue

[Wouter Verhelst <wouter@...3...>]

On Thu, Apr 13, 2006 at 09:52:30AM +0200, JaniD++ wrote:
> Hello, list
> 
> I use the 2.8.4 server, and the -persist capable client.
> Today, one of my nodes hangs, and i cannot kill the server!

Err, that shouldn't happen. Ever.

> [root@...83... root]# killall -KILL nbd-server
> [root@...83... root]# ps fax | grep nbd
> 27330 pts/2    S      0:00          \_ grep nbd
> 17001 ?        D<   230:27 nbd-server 1230 /dev/md0 2097000
> 26959 ?        D<     0:00 nbd-server 1230 /dev/md0 2097000
> [root@...83... root]# killall -KILL nbd-server
> [root@...83... root]# killall -KILL nbd-server
> [root@...83... root]# killall -KILL nbd-server
> [root@...83... root]# killall -KILL nbd-server
> [root@...83... root]# ps fax | grep nbd
> 27336 pts/2    S      0:00          \_ grep nbd
> 17001 ?        D<   230:27 nbd-server 1230 /dev/md0 2097000
> 26959 ?        D<     0:00 nbd-server 1230 /dev/md0 2097000
> [root@...83... root]#
> 
> No dmesg message, just hang.
> (I know this caused by some garbage from the network, but i cannot
> reproduce...)

Which obviously is going to make debugging rather hard. Still, I'd like
to try to reproduce this; could you send me a bit more information on
how this problem occurred that might help me out?

If the system is still running in this broken way, could you run
"netstat -t" and see whether that returns any high numbers in either the
"Recv-Q" or "Send-Q" columns?

-- 
Fun will now commence
  -- Seven Of Nine, "Ashes to Ashes", stardate 53679.4