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Date: Tue, 13 Mar 2012 20:44:43 +0100
From: Dimitry Andric <dim@FreeBSD.org>
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To: Alexandre Martins <alexandre.martins@netasq.com>
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Cc: Konstantin Belousov <kostikbel@gmail.com>, freebsd-current@freebsd.org
Subject: Re: Double free() in libc or gdb ?
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On 2012-03-13 11:08, Alexandre Martins wrote:
> On Monday 12 March 2012 18:55:55 Konstantin Belousov wrote:
>> On Mon, Mar 12, 2012 at 05:50:33PM +0100, Alexandre Martins wrote:
...
>>> I have the libc compilled with "MALLOC_DEBUG" flag to detect double free.
>>> When i run this piece of code (attached file) thought GDB, i have this
>>> assertion :
>>>
>>> Assertion failed: ((run->regs_mask[elm] & (1U << bit)) == 0), function
>>> arena_run_reg_dalloc, file /usr/src/lib/libc/stdlib/malloc.c, line 2543.

I have committed a fix for this assertion (actually a double free) in
r232934.  Can you please update to that revision, rebuild your gdb, and
try again?