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Date: Mon, 27 Aug 2012 17:51:31 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Luca Pizzamiglio <luca.pizzamiglio@gmail.com>
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Cc: Michael Scheidell <scheidell@FreeBSD.org>, freebsd-ports@FreeBSD.org
Subject: Re: gdb75 dumps core on startup
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on 27/08/2012 17:48 Luca Pizzamiglio said the following:
> I'm waiting someone commit this:
> 
> ports/171109

Great, thanks!

> On Mon, Aug 27, 2012 at 4:44 PM, Andriy Gapon <avg@freebsd.org> wrote:
>> on 27/08/2012 17:03 Andriy Gapon said the following:
>>> Program terminated with signal 11, Segmentation fault
>>> ...
>>> #0  0x00000000004777e2 in i386_use_watchpoints ()
>>> #1  0x0000000000476bbd in _initialize_amd64fbsd_nat ()
>>> #2  0x000000000060deea in initialize_all_files ()
>>> #3  0x00000000005e710f in gdb_init ()
>>> #4  0x0000000000549086 in relocate_gdb_directory ()
>>> #5  0x0000000000547aa4 in catch_errors ()
>>> #6  0x0000000000548bb4 in gdb_main ()
>>> #7  0x0000000000457ea9 in main ()
>>>
>>> This is on amd64 head.
>>>
>>
>> The problem seems to be caused by files/patch-gdb-amd64-nat.h, which for some
>> cryptic reason removes prototype of amd64bsd_target() from amd64-nat.h.  That
>> allows the code to be compilable still (sloppy gdb developers!) but the assumed
>> return type of the function becomes int instead of a pointer which it really is.
>> Thus, the returned pointer value gets truncated on amd64 and as a result an
>> invalid pointer is passed to i386_use_watchpoints() from _initialize_amd64fbsd_nat().
>>
>> Oh, looking at the patch in PR ports/165357
>> (http://www.freebsd.org/cgi/query-pr.cgi?pr=165357), it seems that
>> amd64bsd_target() should have re-appeared in a new header file "amd64bsd-nat.h"...
>>  But that part of the patch seems to be incorrect in that it would create
>> files/amd64bsd-nat.h instead of a patch file to create amd64bsd-nat.h in the
>> source directory.  Apparently this file never made it as a result.
>>
>> --
>> Andriy Gapon


-- 
Andriy Gapon