Date: Thu, 16 May 2002 01:53:51 +0200 From: Bernd Walter <ticso@cicely5.cicely.de> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: Rich Bud <rbud@fortean.com>, freebsd-alpha@FreeBSD.org Subject: Re: natd sig 10 under stable Message-ID: <20020515235351.GO4401@cicely5.cicely.de> In-Reply-To: <15586.55082.170680.378288@grasshopper.cs.duke.edu> References: <20020515160407.T28044-100000@nemesis.fortean.com> <15586.55082.170680.378288@grasshopper.cs.duke.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, May 15, 2002 at 05:46:18PM -0400, Andrew Gallatin wrote:
>
> Rich Bud writes:
> > BTW, Craig Burgess posted about a sig 10 in natd back in february under
> > different conditions. I didn't see any replies, so i'm guessing this is
> > the same problem...
>
> Probably, but this is much more useful information that Craig was ever
> able to supply. With your information, it may be possible to diagnose
> & fix the problem.
>
>
> > Program received signal SIGBUS, Bus error.
> > 0x120008614 in AliasHandleQuestion (count=1, q=0x11feb911, pmax=0x11feb926 "", nbtarg=0x11feb838) at /usr/src/lib/libalias/alias_nbt.c:290
> > 290 switch ( ntohs(q->type) ) {
> > (gdb) ptype q
> > type = struct {
> > u_short type;
> > u_short class;
> > } *
> > q = (NBTNsQuestion *) 0x11feb911, q->class = 1, q->type = 0
> >
>
> This address is unaligned. Is one of machdep.unaligned_sigbus
> == 1, machdep.unaligned_fix == 0 true? (or the uac equivalent)
Can you please print pip, *pip, uh, p and nsh in AliasHandleUdpNbtNS()?
I will need to know which part of the packets can be missaligned.
It's much fast if we can realign the whole data part instead of just
each segment.
> If not, perhaps the unaligned fixup handler needs to be enhanced to
> handle a new sort of instruction. Can you disassemble the code at the
> faulting PC & see what instruction generated the access, please?
> (or enable unaligned printing via uac -p in the shell which starts natd).
Sounds like the most likely reason - especially considering BWX.
I will check out how much work it is to expand our trap.c
--
B.Walter COSMO-Project http://www.cosmo-project.de
ticso@cicely.de Usergroup info@cosmo-project.de
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-alpha" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020515235351.GO4401>