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--0-1771677491-921874085=:16645
Content-Type: TEXT/PLAIN; charset=US-ASCII

On Fri, 19 Mar 1999, Bill Studenmund wrote:

> On Fri, 19 Mar 1999, Paul H. Anderson wrote:
> 
> > On Thu, 18 Mar 1999, Bill Studenmund wrote:
> > 
> > I can relatively easily reproduce the crash.  This morning, I did newfs on
> > my ccd filesystem (-b 32768 -f 8192) and ran a stress test that caused a
> > panic after about an hour.  The locks below come from this second panic
> > (not the one that gave the above traceback).  The second panic looks like
> > the first (same message), but it is still at the ddb prompt on the serial
> > console, and the alpha doesn't do kernel stack tracebacks yet, so I can't
> > confirm that it is exactly the same - tell me what you want to get, and
> > I'll do it.
> > 
> > > Does ddb (the in-kernel debugger) work on alpha? If so, call
> > > printlockedvnodes() before trying to reboot. I think it should tell you
> > > where/how the node got locked.
> > 
> > Here's the locks:
> > 
> > charger# sh wedge.sh
> > ... some minor output deleted
> > successful open, length=0, mapdata=0
> > panic: lockmgr: locking against myself
> > Stopped in tar at       Debugger+0x4:   ret     zero,(ra)
> > db> call printlockedvnodes
> 
> I'd say have it drop core, and then get a stack trace from gdb. :-)

This an attachment to this message.  Let me know if you don't like
attachments.

> Can you send me that script?

Likewise. 

The script uses a program 'maptest' which mmaps all listed files and
touches each page, forcing it to be pages into vm.  The directory that I
use for testing had 16 256MB files in it, so it tries to map 4GB of data.

I ran a test without the maptest, and it paniced.  I put it in thinking it
might make it panic sooner.  Giving you the source that is useful is
harder, cause it is part of my software, and I need to split out the
components that are essential for compilation.

I sent this reply to the list - please let me know if I don't need to
reply to the whole group in the future regarding this subject - thanks!

Paul

+------------------------------------------------------+
| Paul Anderson           Public Data Queries, Inc.    |
| pha@pdq.com             734-213-4964(W) 994-3734(H)  |
+------------------------------------------------------+

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Content-Description: script I run to make alpha do a ufs panic
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