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Date: Fri, 27 Dec 2013 19:44:23 +0000 (UTC)
From: David Wuertele <>
Subject: Re: NULL deref SEGV in malloc.c:unbin()

Rich Felker <dalias <at>> writes:
> On Fri, Dec 27, 2013 at 06:35:00PM +0000, David Wuertele wrote:
> > I wonder if anyone has hit this before?   In unbin(), c->next->prev is set,
> > but c->next is NULL.   It happens repeatedly, and here's what gdb says:
> It's almost surely a case of memory corruption by the calling program,
> most likely using memory after it's already been freed.

Hmm, my program calls malloc() once and never calls free().
Oh, I guess it does call free indirectly when it uses closedir() and fclose().
I will try to use gdb/watch to catch someone red-handed.


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