Re: Kernel panic on earm

[Nick Hudson <nick.hudson%gmx.co.uk@localhost>]

On 25/10/2018 17:49, Michael Blatt wrote:
> OK, so...
> I inserted boothowto |= AB_DEBUG to
> sys/arch/evbarm/marvell/marvell_machdep.c under initarm() as that made
> sense, is this correct?
>
> the panic is
> Starting network.
> [  32.7799960] Fatal kernel mode data abort: 'Alignment Fault 1'
> [  32.7799960] trapframe: 0xcc7d1bc8
> [  32.7799960] FSR=00000001, FAR=cc7d1ddc, spsr=60000013
> [  32.7799960] r0 =c29b33c0, r1 =cc7d1dcc, r2 =00000000, r3 =00000000
> [  32.7799960] r4 =c04f060c, r5 =00022078, r6 =bfffdfd0, r7 =00000010
> [  32.7799960] r8 =bbc0d180, r9 =bfffe0a8, r10=bbc17b65, r11=cc7d1c44
> [  32.7799960] r12=cc7d1c48, ssp=cc7d1c18, slr=c04f7f48, pc =c04f01dc
>
> Stopped in pid 95.1 (ifconfig) at       c04f01dc:       strd    r2, [r1, #0x10]
> db>
>
> db> bt
> 0xcc7d1c44: c04efc94
> 0xcc7d1c74: c04f7f48
> 0xcc7d1d74: c04f0b00
> 0xcc7d1da4: c045be3c
> 0xcc7d1e84: c044c4f8
> 0xcc7d1eac: c001a568
> 0xcc7d1edc: c001a650
> 0xcc7d1f8c: c001ab98
> 0xcc7d1fac: c001a874

Left hand number is stack (or frame pointer, I forget which) and right 
is the PC values that need to run through addr2line

Doesn't look like stack is ever aligned :S

> On another NetBSD machine (armv6) I looked at the kernel used:
> addr2line -e netbsd -f 0xc04f01dc

You need to use a netbsd.gdb

./build.sh -m evbearmv5-el -O ../obj.evbearmv5-el tools

on your fastest unix-like machine will give you a cross addr2line

Nick