Date: Thu, 5 Nov 2015 13:14:11 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Lars Engels <lars.engels@0x20.net> Cc: arm@freebsd.org Subject: Re: [Banana Pi] Fatal kernel mode data abort: 'Alignment Fault' on read Message-ID: <563B4813.1060403@selasky.org> In-Reply-To: <20151105120950.GR66179@e-new.0x20.net> References: <20151105104859.GQ66179@e-new.0x20.net> <563B372E.20607@selasky.org> <20151105120950.GR66179@e-new.0x20.net>
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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@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. --HPS
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