Mike Clarke wrote:
I'm getting frequent panics due to spin lock held too long when booting my recently built 6.3 system with an Athlon 4850e dual core processor on a Foxconn 6150M2MA motherboard (GeForce 6150 and nForce 430 chipsets).

FreeBSD curlew.lan 6.3-STABLE FreeBSD 6.3-STABLE #2: Sat Jul 12 09:43:21 BST 2008 [EMAIL PROTECTED]:/usr/obj/usr/src/sys/CURLEW i386

I'd welcome any advice on how to understand and fix this. The panics usually happen immediately after the "Mounting local filesystem" message, but sometimes just before the end of the boot process.

The system goes through the motions of producing a crash dump with a visible count down on the screen followed with...

Dump complete
Automatic reboot in 15 seconds - press a key on the console to abort
Rebooting...
cpu_reset: Stopping other CPUs

... then it just hangs until I do a hard reset.

The odd thing is that when I reboot there doesn't appear to be any crash dump - I see the following messages:

Checking for core dump on /dev/ad4s1b...
savecore: no dumps found

Is the lack of a dump due to some config error of mine, or an effect of the spin lock problem?

Here's the head of my kernel file ...

include         GENERIC
nocpu           I486_CPU
nocpu           I586_CPU
ident           CURLEW
nooptions       COMPAT_FREEBSD4         # Compatible with FreeBSD4
nooptions       COMPAT_FREEBSD5         # Compatible with FreeBSD5
options         DDB
options         KDB
options         KDB_UNATTENDED

You should add options WITNESS also and this will probably generate additional debugging and/or a panic before the error occurs.

But I'm still a bit dubious as to whether I've really managed to create a debugging kernel. I was under the impression that there should be some *.symbols files in the /boot/kernel directory but there aren't any (or is this just a rev. 7 thing?) and the kernel directory is only 24 MB.

I also noticed when building the kernel there were lines like ...

objcopy --strip-debug kernel.debug kernel

... though I do still have /usr/obj/usr/src/sys/CURLEW/kernel.debug. should I be doing something with this?

You can just use it post-mortem with kgdb.

Kris
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