[Banana Pi] Fatal kernel mode data abort: 'Alignment Fault' on read
lars.engels at 0x20.net
Thu Nov 5 15:34:29 UTC 2015
On Thu, Nov 05, 2015 at 01:14:11PM +0100, Hans Petter Selasky wrote:
> On 11/05/15 13:09, Lars Engels wrote:
> > On Thu, Nov 05, 2015 at 12:02:06PM +0100, Hans Petter Selasky wrote:
> >> On 11/05/15 11:48, Lars Engels wrote:
> >>> Using FreeBSD-armv6-11.0-A20-290366.img I can reproducible crash the
> >>> kernel by USB-tethering the Banana Pi to a mobile phone and run "
> >>> pkg bootstrap". It looks like this:
> >>> root at bananapi:/ # pkg bootstrap
> >>> The package management tool is not yet installed on your system.
> >>> Do you want to fetch and install it now? [y/N]: y
> >>> Bootstrapping pkg from pkg+http://pkg.FreeBSD.org/FreeBSD:11:armv6/latest, please wait...
> >>> Fatal kernel mode data abort: 'Alignment Fault' on read
> >>> trapframe: 0xea576a90
> >>> FSR=00000001, FAR=c43a1d6e, spsr=60000113
> >>> r0 =00000014, r1 =0000003c, r2 =0000003c, r3 =00000903
> >>> r4 =00000000, r5 =c43a1d6a, r6 =00000028, r7 =c43a1d56
> >>> r8 =00000000, r9 =00000014, r10=00000028, r11=ea576bf8
> >>> r12=00000000, ssp=ea576b20, slr=c061aba4, pc =c04f68e8
> >>> [ thread pid 13 tid 100024 ]
> >>> Stopped at tcp_input+0x820: ldr r0, [r5, #0x004]
> >> Hi,
> >> Could you "objdump -Dx --source /boot/kernel/kernel" and figure out
> >> which code line "tcp_input+0x820" corresponds to?
> > You mean like "objdump ... | grep -C10 tcp_input+0x820"?
> > I started that half an hour ago and it's still not finished.
> No, you need to find where tcp_input starts, by less-ing it, then add
> 0x820 to that address and then verify that the assembly instruction
> there matches.
Ok, I have no idea what I am doing, but here's what I did:
# objdump -Dx --source /boot/kernel/kernel --start-address="0xc04f51c8" --stop-address="0xC04F59E8"
The result is a 1,3MB text file at:
Can you see anything there?
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