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Date: Tue, 23 Aug 2011 22:05:43 +0200
From: Aragon Gouveia <aragon@phat.za.net>
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Subject: reproducible panic on 8.2-RELEASE, but no core file
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Hi,

I'm experiencing a reproducible kernel panic that would be really nice 
to debug, but unfortunately no core file is getting generated.  I don't 
have console access either.  All I can get so far is this, from syslog:

Aug 23 19:51:38 <kern.crit> estranged kernel:
Aug 23 19:51:38 <kern.crit> estranged kernel: Fatal double fault:
Aug 23 19:51:38 <kern.crit> estranged kernel: eip = 0xc0593b2e
Aug 23 19:51:38 <kern.crit> estranged kernel: esp = 0xe5583fe4
Aug 23 19:51:38 <kern.crit> estranged kernel: ebp = 0xe5584010
Aug 23 19:51:38 <kern.crit> estranged kernel: cpuid = 0; apic id = 00
Aug 23 19:51:38 <kern.crit> estranged kernel: panic: double fault
Aug 23 19:51:38 <kern.crit> estranged kernel: cpuid = 0
Aug 23 19:51:38 <kern.crit> estranged kernel: panic: 0xc4263b40 must be 
migratable
Aug 23 19:51:38 <kern.crit> estranged kernel: cpuid = 0
Aug 23 19:51:38 <kern.crit> estranged kernel: panic: 0xc4263b40 must be 
migratable
Aug 23 19:51:38 <kern.crit> estranged kernel: cpuid = 0
[SNIP - above two lines repeated alot]
Aug 23 19:51:38 <kern.crit> estranged kernel: cpuid = 0kernel trap 12 
with interrupts disabled
Aug 23 19:51:38 <kern.crit> estranged kernel: panic:
Aug 23 19:51:38 <kern.crit> estranged kernel: 0xc4263b40 must be 
migratablekernel trap 12 with interrupts disabled
Aug 23 19:51:38 <kern.crit> estranged kernel: kernel trap 12 with 
interrupts disabled
Aug 23 19:51:38 <kern.crit> estranged kernel: cpuid = 0
Aug 23 19:51:38 <kern.crit> estranged kernel: kernel trap 12 with 
interrupts disabled
Aug 23 19:51:38 <kern.crit> estranged kernel: panic:

My dumpdev is set:

$  ls -l /dev/dumpdev
lrwxr-xr-x  1 root  wheel  11 Aug 23 19:56 /dev/dumpdev@ -> /dev/ad4s1b

But savecore reports:

Aug 23 19:56:34 <console.info> estranged kernel: No core dumps found.

Any advice for getting a core file? :)


Thanks,
Aragon