Re: port-amd64/39283: Kernel crash on Dell Poweredge 2950

[Mindaugas Rasiukevicius <rmind%netbsd.org@localhost>]

Hello,

>  > Synopsis: 4.99.71 crashed after about 3-4 days when running MP-kernel
>  >
>  > State-Changed-From-To: open->feedback
>  > State-Changed-By: dsl%NetBSD.org@localhost
>  > State-Changed-When: Fri, 06 Nov 2009 22:49:43 +0000
>  > State-Changed-Why:
>  > Any further info ??
>  
>  No more than the info that we put in the PR and on the mailing lists:
>  
>  http://archive.netbsd.se/?ml=netbsd-current-users&a=2008-07&t=7775691
>  http://archive.netbsd.se/?ml=port-amd64&a=2009-02&t=9259482
>  
>  The server crashed every 8'th day on SP-kernel and every 24'th hour with
>  MP-kernel. The problem has evolved with NetBSD releases, these days it's
>  "only" the filesystem that seems to hang and no i/o is possible without
>  reboot, if it runs to long without reboot is eventually crashed.

Seems there is not yet enough information to figure out where bug is hiding.
Also, it the only problem report with such symptoms, but if it is happening
consistently and crashing the same way - unlikely to be a hardware problem.

http://mail-index.netbsd.org/port-amd64/2008/12/19/msg000684.html

Looking at the data from your email, there is callback_run_roundrobin() which
calls a function pointer, but it is very unlikely to be NULL.  I have added an
assert, "just in case":

http://mail-index.netbsd.org/source-changes/2009/11/24/msg003498.html

Would you be able to try -current kernel, with that change in the link, and
with the following debug options:

options DIAGNOSTIC
options DEBUG
makeoptions DEBUG="-g -fno-omit-frame-pointer"

Then repeat x/Lx and x/I dance again.  But no LOCKDEBUG option, as it might
avoid some overhead and hopefully get stack dump a little bit more readable.
Additionally, 'show uvm' output from DDB might be useful.

Thanks.

-- 
Mindaugas