Re: Stack Overflow in GEOM

On Tue, Apr 16, 2013 at 10:56:31AM -0700, Cy Schubert wrote:
> Has anyone see this before? Just updated my CURRENT partitions on my 
> testbed and laptop. The laptop just boots but I've managed to capture this 
> on my testbed (attached to a serial port on another system).
> 
> This is HEAD from yesterday (Apr 15) morning (PDT). The partition being 
> booted is ada0s1d. On my laptop it's ada0s3a. KSTACK_PAGES is 4. Is there a 
> way to quickly display that kern.kstack_pages from DDB?
> ... 
> panic: stack overflow detected; backtrace may be corrupted
> cpuid = 1
> KDB: enter: panic
> [ thread pid 13 tid 100009 ]
> ....

I'm seeing this, but my situation is ... reversed: my build machine came
up OK:

FreeBSD freebeast.catwhisker.org 10.0-CURRENT FreeBSD 10.0-CURRENT #1134 r249538M/249542:1000030: Tue Apr 16 09:15:49 PDT 2013     root_at_freebeast.catwhisker.org:/usr/obj/usr/src/sys/GENERIC  i386

but my laptop exhibits symptoms that I *believe* resemble those you
cited.  (I was unable to get a crash dump, and the machine rebooted too
quickly after I typed "panic" at the ddb prompt.  I don't have a serial
console on the laptop.)

I had thought that it might be nvidia-driver-related (again), but I also
note that the laptop has a single SATA drive, while the build machine
has SCSI (possibly SAS -- machine is powered off for the day, since its
work is done) drives.  Laptop also has 2x the memory the build machine
does.  (They are each i386.)

My last successful smoke-test for head on the laptop was yesterday:

FreeBSD g1-227.catwhisker.org 10.0-CURRENT FreeBSD 10.0-CURRENT #869  r249502M/249503:1000030: Mon Apr 15 05:23:38 PDT 2013     root_at_g1-227.catwhisker.org:/usr/obj/usr/src/sys/CANARY  i386

I had built head _at_r249538 this morning, and that's the build where
my smoke-test failed.

Peace,
david
-- 
David H. Wolfskill				david_at_catwhisker.org
Taliban: Evil men with guns afraid of truth from a 14-year old girl.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.