severity 398421 important
tags 398421 moreinfo unreproducible
thanks
On Fri, Feb 02, 2007 at 04:23:22PM +0100, Robert Millan wrote:
> Steve, Paul: if you want to reproduce this, I suggest you look for mmap()
> invocations using -1. They do appear and seem to be the root of the problem,
> although they don't always generate segfault due to pseudo-random conditions.
No, this is a red herring. From mmap(2):
fd should be a valid file descriptor, unless MAP_ANONYMOUS is set. If
MAP_ANONYMOUS is set, then fd is ignored on Linux. However, some
implementations require fd to be -1 if MAP_ANONYMOUS (or MAP_ANON) is
specified, and portable applications should ensure this.
The original strace you provided showed that the mmaps were requests for
MAP_ANONYMOUS segments.
> If you ask me, I wouldn't feel safe shipping with this bug. -m32 is not such
> a bad solution (compared to a binary that segfaults randomly).
I don't find that it segfaults randomly; I find that it doesn't segfault at
all.
You say that it's only segfaulting when strace is *not* being used. So does
it segfault when run under gdb? That's what should be done to try to
isolate the source of this bug.
--
Steve Langasek Give me a lever long enough and a Free OS
Debian Developer to set it on, and I can move the world.
[EMAIL PROTECTED] http://www.debian.org/
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