Date: Fri, 28 Aug 1998 12:24:31 +0300 From: Alexander Litvin <archer@lucky.net> To: Mike Smith <mike@smith.net.au> Cc: current@FreeBSD.ORG Subject: Re: encountered possible VM bug ? Message-ID: <19980828122431.14123@carrier.kiev.ua> In-Reply-To: <199808280119.BAA03086@word.smith.net.au>; from Mike Smith on Fri, Aug 28, 1998 at 01:19:08AM %2B0000 References: <199808280808.LAA00123@grape.carrier.kiev.ua> <199808280119.BAA03086@word.smith.net.au>
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On Fri, Aug 28, 1998 at 01:19:08AM +0000, Mike Smith wrote:
> > Reading symbols from /usr/libexec/ld.so...done.
> > Reading symbols from /usr/lib/aout/libc.so.3.1...done.
> >
> > Error accessing memory address 0x0: Bad address.
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > What exactly does that line mean? When I attach to not deseased dummy_daemon,
> > it does not appear, instead I see:
>
> It means that the instruction pointer obtained for the process is 0,
> which is invalid.
Do you mean eip register? 'info registers' show:
eax 0xf0 240
ecx 0x4 4
edx 0x1 1
ebx 0x20084060 537411680
esp 0xefbfdbd0 0xefbfdbd0
ebp 0xefbfdbf4 0xefbfdbf4
esi 0x3c 60
edi 0x0 0
eip 0x20057c21 0x20057c21
eflags 0x282 642
cs 0x1f 31
ss 0x27 39
ds 0x27 39
es 0x27 39
fs 0x27 39
gs 0x27 39
That is, eip is pinting to the same address 0x20057c21, as it is
for 'healthy' copy of the program. The code under 0x20057c21
seems to be in place.
> --
> \\ Sometimes you're ahead, \\ Mike Smith
> \\ sometimes you're behind. \\ mike@smith.net.au
> \\ The race is long, and in the \\ msmith@freebsd.org
> \\ end it's only with yourself. \\ msmith@cdrom.com
>
---
Happiness, n.:
An agreeable sensation arising from contemplating the misery of
another.
-- Ambrose Bierce, "The Devil's Dictionary"
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