obtaining kernel.debug

[christopher floess]

I'm trying to debug some panics on my system, and the section in the
handbook that goes over kernel debugging points to
/usr/obj/usr/src/sys/KERNEL as the location of kernel.debug. But I don't
have this file there. I only have 'kernel'. There is another section in the
faq, that addresses getting a kernel.debug by using the 'old method'
of recompiling the kernel. It's the one that involves using
/usr/sbin/config, make depend, make, make install, which I don't even think
is covered in the current handbook anymore. Is this section of the faq out
of date?
(here's the link
http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/advanced.html#KERNEL-PANIC-TROUBLESHOOTING
)

I've obtained a vmcore file, and now I just need kernel.debug.

Is there a way to get this file using the new make procedure for kernels?
Can I just use the 'kernel' file, or is there a difference between 'kernel'
and 'kernel.debug'? Thanks for any help ~ Chris

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fatal trap 12, can't get core

[christopher floess]

Hi, I'm running 5.4 with a modified GENERIC kernel, and  I recently rebooted
my system to find out that it hangs on probing ad1 with a fatal trap 12.

Here's the entire error message

ad1 Timeout - Read_dma retrying (2 retries left) LBA 117231345
kernel trap 12 with interrupts disabled
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x6c
fault code   = supervisor read, page not present
instruction pointer   = 0x8:0xc063fb59

stack pointer = 0x10:0xde0fac40
frame pointer= 0x10:0xde0fac44
code segment= base 0x0, limit 0xf, type ox1b
 = DPL 0, pres 1, def32 1, gran 1
processor eflags   = resume, IOPL = 0
current process= 6(thread taskq)
trap number = 12
panic: page fault
cannot dump. no dump device

In my rc.conf I've got

dumpdev=/dev/ad0s1b
dumpdir=/usr/crash

For some reason it still says no dump device.
Right now I'm able to boot my system into safe mode, but not single
user or normal. I
think I might not be able to get core dumps b/c my system doesn't get far
enough in the boot process,  so I'm trying to follow the directions here

http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/advanced.html#KERNEL-PANIC-TROUBLESHOOTING


but I'm not sure about this part of the instructions

% nm -n /kernel.that.caused.the.panic | grep f0xx

Do I need to replace /kernel.that.caused.the.panic with
/boot/kernel/kernel? If so, here' is the out put of


nm -n /boot/kernel/kernel | grep c063fb59

c063fb3c t init_turnstile0
c063fb4c t turnstile_setowner
c063fb78 T turnstile_alloc
c063fbb0 T turnstile_free
c063fbc4 T turnstile_lookup

Can someone help me out here? Am I going about it all wrong? Let me know
what other info might be needed. Thanks ~ Chris

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