From: Andrew Schulman <schulman.andrew@epa.gov>
To: cygwin@cygwin.com
Subject: Re: [ANNOUNCEMENT] mesa 11.0.9-2 [GOLDSTAR]
Date: Fri, 10 Jun 2016 14:49:00 -0000 [thread overview]
Message-ID: <hfillbd2uvmm8jb779j019dvomuvhk911l@4ax.com> (raw)
In-Reply-To: <e9bd250e-783d-0ce0-f1ee-e9614e5d8c17@cygwin.com>
> On 6/6/2016 9:27 AM, Jon Turney wrote:
> > On 06/06/2016 08:24, Yaakov Selkowitz wrote:
> >> On 2016-06-03 12:56, Jon Turney wrote:
> >>> On 31/05/2016 18:03, Jon Turney wrote:
> >>>>> # gdb ./quad-clip
> >>>>> [...]
> >>>>> (gdb) r
> >>>>> [...]
> >>>>> Program received signal SIGSEGV, Segmentation fault.
> >>>>> 0x7fdf00c1 in ?? ()
> >>> [...]
> >>>>> /usr/src/debug/mesa-demos-8.3.0-1/src/trivial/quad-clip.c:137
> >>>>> (gdb) disassemble 0x7fdf00b1,0x7fdf00d2
> >>>>> Dump of assembler code from 0x7fdf00b1 to 0x7fdf00d2:
> >>>>> 0x7fdf00b1: insertps $0x10,0x4(%eax,%edi,1),%xmm0
> >>>>> 0x7fdf00b9: insertps $0x20,0x8(%eax,%edi,1),%xmm0
> >>>>> => 0x7fdf00c1: insertps $0x30,0xfffeff34,%xmm0
> >>>>> 0x7fdf00cb: mov (%esi),%eax
> >>>>> 0x7fdf00cd: mul %ecx
> >>>
> >>> After staring this a bit more, I see that this is the offset to the data
> >>> to load, apparently being used as an absolute address
> >>>
> >>> This seems to be the case with other addresses in the JIT-ed code, so
> >>> perhaps there is some problem preventing relocations being applied...
> >>
> >> FWIW, I tried rebuilding with llvm 3.8.0. 32-bit doesn't crash anymore,
> >> and glxgears says its running, but only the background shows.
> >
> > Thanks, that was next on my list to try
> >
> > That sounds exactly like what I see with llvm svn r251761 [1] backported
> > to 3.7.1 (without which we use the x86_64 loader on x86, rather than
> > reporting an error, due to an interesting use of __builtin_undefined,
> > with hilarious consequences)
> >
> > I guess the output of the JIT code is ending up the wrong place as well,
> > or something...
>
> For the record, Jon seems to have tracked this down, and his fix is in
> llvm-3.7.1-2. I can only imagine what "fun" he had debugging this,
> particularly on the address-starved 32-bit platform.
>
> Andrew, could you please do the honours?
Awarded! http://cygwin.com/goldstars/#JTy
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next prev parent reply other threads:[~2016-06-10 14:09 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-22 9:08 [ANNOUNCEMENT] mesa 11.0.9-2 Yaakov Selkowitz
2016-04-12 15:20 ` Marco Atzeri
2016-04-13 2:17 ` gdb using Windows paths in dlopen()ed modules? Yaakov Selkowitz
2016-04-13 8:09 ` Corinna Vinschen
2016-04-13 2:33 ` [ANNOUNCEMENT] mesa 11.0.9-2 Yaakov Selkowitz
2016-05-25 13:56 ` Marco Atzeri
[not found] ` <b8ee7d32-504d-27d8-51ab-547ea7a51968@dronecode.org.uk>
2016-06-03 17:56 ` Jon Turney
2016-06-06 7:25 ` Yaakov Selkowitz
2016-06-06 14:27 ` Jon Turney
2016-06-09 22:01 ` [ANNOUNCEMENT] mesa 11.0.9-2 [GOLDSTAR] Yaakov Selkowitz
2016-06-10 4:36 ` Marco Atzeri
2016-06-10 8:31 ` Corinna Vinschen
2016-06-10 14:49 ` Andrew Schulman [this message]
2016-06-20 18:29 ` Jon Turney
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