Date: Fri, 20 Jun 2014 08:10:24 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: arm@FreeBSD.org Subject: Re: AVILA getting close! Message-ID: <20140620151023.GZ31367@funkthat.com> In-Reply-To: <20140618225808.GG31367@funkthat.com> References: <20140618225808.GG31367@funkthat.com>
next in thread | previous in thread | raw e-mail | index | archive | help
John-Mark Gurney wrote this message on Wed, Jun 18, 2014 at 15:58 -0700:
> So, w/ the recent couple of patches that alc has provided, I no longer
> receive kernel panics on my AVILA board!
>
> $ uname -a
> FreeBSD avila.funkthat.com 11.0-CURRENT FreeBSD 11.0-CURRENT #27 r267333:267349M: Wed Jun 11 09:57:58 PDT 2014 jmg@carbon.funkthat.com:/usr/obj/arm.armeb/usr/src.avila/sys/AVILA arm
> $ uptime
> 12:15AM up 1 day, 15 mins, 2 users, load averages: 0.13, 0.11, 0.08
>
> This survived a portsnap extract... This is all over NFS...
>
> Though the issue that I'm now having is that some binaries (newsyslog)
> and sometimes other binaries (awk, grep) core dump...
>
> I believe this is an issue w/ rtld, or related... If I compile newsyslog
> -static, it works fine... Otherwise I get a SIGILL, and that is
> because it jumps off into the weeds.. Though gdb on arm isn't very
> useful..
ok, so the SIGILL only occures under gdb, and this is because single
stepping into a RAS sequence doesn't work very well... If you set a
break point on the return (after the RAS sequence), you can get past
this...
I got to the point in rtld.c code:
if (obj->pltrel)
rel = (const Elf_Rel *) ((caddr_t) obj->pltrel + reloff);
else
rel = (const Elf_Rel *) ((caddr_t) obj->pltrela + reloffand was seeing gdb try to execute the pltrela line, but:
i;
and was seeing gdb try to execute the pltrela line, but:
(gdb) print * (const Elf_Rel *) ((caddr_t) obj->pltrela + reloff)
Error accessing memory address 0x118: Bad address.
(gdb) print/x obj->pltrela
$4 = 0x0
(gdb) print /x reloff
$5 = 0x118
(gdb) print obj->pltrel
$6 = (const Elf_Rel *) 0x94e8
Hun? obj->pltrel is non-zero, so it should have executed the other
line...
I recompiled rtld w/ -O0, and sure enough, newsyslog runs fine... If
I compile w/o -O, or w/ -O1, it fails...
Comments or suggestions?
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20140620151023.GZ31367>