Re: [9fans] ip/rarpd problem

[presotto@plan9.bell-labs.com]

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Given where it crashes, it isn't garbled, 0xffff0000 is what is being passed.
One possibility is that something on the stack above _fmtdispatch trashed the
stack.  I don't see anything obviously wrong.  We stopped running rarpd when
our last sun went nova.  You might try rebuilding the libraries and rarpd and
see if it still happens.  The line numbers from your acid stack dump are
a bit different than the current source, so you might have some incompatible
changes in there (or acid is guessing badly).

Otherwise, keep digging, bug snprint and see if fmt is 0xffff0000 coming in,
etc.  If it's consistently repeatable, it should be easy to track down just
by marching tests through the code.

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From: kazumi iwane <kiwane@mx6.ttcn.ne.jp>
To: 9fans@cse.psu.edu
Subject: [9fans] ip/rarpd problem
Date: Wed, 04 Sep 2002 07:10:53 +0900
Message-ID: <20020903221016.ZHGO17976.mta5p@isabella>

ip/rarpd dies as soon as it receives a request.

 rarpd 208: suicide: sys: trap: fault read addr=0xffff0000 pc=0x00002c19

Below is what acid tells me. dofmt:fmt looks bad. This should be equal
to efmt$1, a static format string defined in eipfmt(). I can't figure
out why this looks garbled.

Can somebody please enlighten me?

acid: stk()
At pc:0x00002c19:dofmt+0x138 /sys/src/libc/fmt/dofmt.c:37
dofmt(*dofmt:fmt=0xffff0000,*dofmt:f=0x7fffe4a8)
	called from vsnprint+0x62 /sys/src/libc/fmt/vsnprint.c:20
vsnprint(*vsnprint:len=0x00000028,*vsnprint:buf=0x7fffe55c,
         *vsnprint:args=0x7fffe50c,*vsnprint:fmt=0xffff0000)
	called from snprint+0x2b /sys/src/libc/fmt/snprint.c:13
snprint(*snprint:fmt=0xffff0000,*snprint:buf=0x7fffe55c,
        *snprint:len=0x00000028)
	called from eipfmt+0x272 /sys/src/libip/eipfmt.c:38
eipfmt(*eipfmt:f=0x7fffe5f0)
	called from _fmtdispatch+0x94 /sys/src/libc/fmt/fmt.c:187
_fmtdispatch(*_fmtdispatch:isrunes=0x00000000,*_fmtdispatch:f=0x7fffe5f0,
             *_fmtdispatch:fmt=0x000114b8)
	called from dofmt+0x75 /sys/src/libc/fmt/dofmt.c:62
dofmt(*dofmt:fmt=0x000114b6,*dofmt:f=0x7fffe5f0)
	called from vsnprint+0x62 /sys/src/libc/fmt/vsnprint.c:20
vsnprint(*vsnprint:len=0x00010000,*vsnprint:buf=0x7fffe744,
         *vsnprint:args=0x7fffe650,*vsnprint:fmt=0x000114b6)
	called from sprint+0x2c /sys/src/libc/fmt/sprint.c:13
sprint(*sprint:fmt=0x000114b6,*sprint:buf=0x7fffe744)
	called from main+0x330 /sys/src/cmd/ip/rarpd.c:141
main(*main:argv=0x7fffefe4,*main:argc=0x00000000)
	called from _main+0x31 /sys/src/libc/386/main9.s:16

-- kazumi iwane