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Re: Exim4 problems


From: Thomas Schwinge
Subject: Re: Exim4 problems
Date: Tue, 17 May 2011 00:13:50 +0200
User-agent: Notmuch/0.5-77-g335dd52 (http://notmuchmail.org) Emacs/23.2.1 (i486-pc-linux-gnu)

Hallo!

On Mon, 16 May 2011 22:42:24 +0200, Svante Signell <address@hidden> wrote:
> On Mon, 2011-05-16 at 20:28 +0200, Thomas Schwinge wrote:
> > On Mon, 16 May 2011 18:17:38 +0200, Svante Signell <address@hidden> wrote:
> > > Thread 5 (Thread 1285.10):
> > > #0  0x018eff4c in ?? ()
> > > #1  0x018f0749 in ?? ()
> > > #2  0x018f0e79 in ?? ()
> > > #3  0x018f0f4b in ?? ()
> > > #4  0x0190194f in ?? ()
> > > #5  0x017eec3c in ?? ()
> > > #6  0x00000000 in ?? ()

> I don't know where this thread comes from. I have debug versions of
> libc0.3, gnumach and hurd. And the exim file is not stripped:

Running ``info files'' (in GDB, after the SEGFAULT happened) should tell
you how the memory regions are mapped.  That might give some clue about
how to translate the addresses.


> Additionally: No breakpoints are possible to set. Looks like they are
> not honoured due to the memory address problems above.

Strange.


> We also see from the BT that the arguments to rda_extract are completely
> wrong: 
> 
> sieve_enotify_mailto_owner=0xffffffff <Address 0xffffffff out of bounds>
> probably also: eblockp=0xffffffff

These look like (int) -1 displayed as 32-bit hex, or casted to (unsigned
int), or to a pointer.  This may be what the author intended to do, or it
may be wrong -- I can't tell yet.


> static int rda_exists(uschar *filename, uschar **error)

Please continue here: what is this function doing?  (You didn't past that
one.)  Does it make sense what it is doing if filename == NULL -- if
we're assuming that is a valid thing to happen?  (Which I can't tell
either, but it may be valid.)


Grüße,
 Thomas

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