RELENG_6 Livelock

[John Baldwin]

On Saturday 16 September 2006 16:55, Frode Nordahl wrote:
> On 16. sep. 2006, at 22.22, Frode Nordahl wrote:
> 
> > On 16. sep. 2006, at 22.09, John Baldwin wrote:
> >
> >> On Saturday 16 September 2006 07:02, Frode Nordahl wrote:
> >>> Hello,
> >>>
> >>> FreeBSD localhost.localdomain 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE
> >>> #1: Wed Sep 13 00:10:04 CEST 2006     frode at localhost.localdomain:/
> >>> usr/obj/usr/src/sys/PT  i386
> >>>
> >>> After running some stress tests for 3 days, I wanted to remove some
> >>> large directories.
> >>
> >> Do you have a coredump?  I assume you do from your debug output.  Can
> >> you download http://www.FreeBSD.org/~jhb/gdb/gdb6, fire up kgdb, and
> >> once in kgdb, do 'source /path/to/gdb6' and then run 'ps' and reply
> >> with the output from that?
> >
> > I am sorry, I have not. I tried to call doadump, but there was no  
> > dumpdevice configured :-(
> >
> > Somehow I have convinced myself that this was turned on by default  
> > now, so I have not enabled it explicitly in rc.conf. Is there any  
> > way to tell DDB what dumpdevice to use directly?
> >
> > I will configure a dumpdevice and try really hard to make it happen  
> > again.
> 
> I was able to reproduce the livelock again, and this time I had the  
> system armed with dumpon :-)
> 
> Here is the output you requested:
> (kgdb) ps
>    pid  ppid  pgrp   uid   state   wmesg     wchan    cmd
> 2535  2499  2535     0  R+      CPU  0              rm
> 2534  2499  2534     0  L+     *Giant    0xc6704580 rm
> 2533  2499  2533     0  L+     *Giant    0xc6704580 rm
> 2532  2499  2532     0  R+                          rm
> 2531  2499  2531     0  L+     *Giant    0xc6704580 rm
> 2499  2496  2499     0  Ss+     ttyin    0xc655d810 bash
> 2496   784  2496     0  Rs                          sshd

Ok, do 'lockchain 2534' in kgdb (with gdb6 sourced) and let me see the
output from that.

-- 
John Baldwin