I've recently started getting kernel panics with a FreeBSD 6.3 machine,
using a minimal i386 custom kernel. I don't believe it's a hardware
issue as they always seem to coincide with a crash on SqueezeCenter,
apparently during heavy usage of the MySQL backend.
I'm unable to get a crash dump. After the panic, all I get in the
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address = 0x5c05df
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc05bc0a0
stack pointer = 0x28:0xe8c178e0
frame pointer = 0x28:0xe8c178ec
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 50243 (perl)
trap number = 12
panic: page fault
cpuid = 1
Dumping 2021 MB (6 chunks)
chunk 0: 1MB (142 pages) ... ok
chunk 1: 2021MB (517262 pages)
and it then sits apparently indefinitely with no disk activity, and
needs a hard reboot.
At startup, no dump is found,
Checking for core dump on /dev/mirror/gm0s1b...
savecore: no dumps found
I have "dumpdev=AUTO" in my rc.conf, which gives the message,
kernel dumps on /dev/mirror/gm0s1b
swapon: adding /dev/mirror/gm0s1b as swap device
Is using a gmirrored swap partition for a dump device supported?
Can anyone suggest what I should be doing to try to get a crash dump
successfully to further diagnose this? Is there anything else relevant
I should post?
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