[Banana Pi] Fatal kernel mode data abort: 'Alignment Fault' on read

Hans Petter Selasky hps at selasky.org
Thu Nov 5 11:00:26 UTC 2015

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]


Could you "objdump -Dx --source /boot/kernel/kernel" and figure out 
which code line "tcp_input+0x820" corresponds to?

According to if_rndis, the IP-header should be aligned via the 
ETHER_ALIGN macro, to 32-bits. The issue is possibly outside USB.


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