Re: [graphviz-interest] pseudo-random segfault when using raster image renderers

This isn't right:
libgvplugin_pango.6.dylib`reader(closure=0x0000000000000000, ...
the closure is supposed to be the FILE* of the image file.

Can you see what:  cairo_image_surface_create_from_png_stream() is being 
called with?


Other things you might try as a work-around:
     gcc instead of llvm
     jpeg images intead of png


John




On 02/24/2014 05:23 PM, Sparr wrote:
> On Mon, Feb 24, 2014 at 4:33 PM, Ron Savage <[email protected]> wrote:
>> Hi
>>
>> The (other) explanation for irregular faults is the code using an
>> uninitialized value. This means the value will vary from run to run, and
>> hence produce not-quite reproducible effects.
>>
>> On 25/02/14 07:15, George Georgalis wrote:
>>> Since you have irregular faults, try testing the hardware with a program
>>> such as memtest86+ failing memory or motherboard can have intermittent
>>> issues, heat can exacerbate too.
> Thanks for the suggestion, George. I've run memtest86 and also some
> hard drive thrashing tools and found no problems there.
>
> Here's some debugging output from lldb running dot and encountering
> the failure in question:
>
> Process 10671 stopped
> * thread #1: tid = 0x2fcdc4, 0x00007fff92d7af6a
> libsystem_c.dylib`flockfile + 18, queue = 'com.apple.main-thread, stop
> reason = EXC_BAD_ACCESS (code=1, address=0x68)
>      frame #0: 0x00007fff92d7af6a libsystem_c.dylib`flockfile + 18
> libsystem_c.dylib`flockfile + 18:
> -> 0x7fff92d7af6a:  movq   104(%rbx), %rdi
>     0x7fff92d7af6e:  cmpq   %r14, 72(%rdi)
>     0x7fff92d7af72:  je     0x7fff92d7af92            ; flockfile + 58
>     0x7fff92d7af74:  addq   $8, %rdi
> (lldb) bt
> * thread #1: tid = 0x2fcdc4, 0x00007fff92d7af6a
> libsystem_c.dylib`flockfile + 18, queue = 'com.apple.main-thread, stop
> reason = EXC_BAD_ACCESS (code=1, address=0x68)
>      frame #0: 0x00007fff92d7af6a libsystem_c.dylib`flockfile + 18
>      frame #1: 0x00007fff92d7cca6 libsystem_c.dylib`fread + 31
>      frame #2: 0x0000000100111d7f
> libgvplugin_pango.6.dylib`reader(closure=0x0000000000000000,
> data=<unavailable>, length=<unavailable>) + 31 at
> gvloadimage_pango.c:44
>      frame #3: 0x000000010038ccd5 libcairo.2.dylib`stream_read_func + 43
>      frame #4: 0x0000000100771b90 libpng15.15.dylib`png_read_sig + 66
>      frame #5: 0x000000010076baf5 libpng15.15.dylib`png_read_info + 46
>      frame #6: 0x000000010038c8e0 libcairo.2.dylib`read_png + 186
>      frame #7: 0x000000010038cc5a
> libcairo.2.dylib`cairo_image_surface_create_from_png_stream + 25
>      frame #8: 0x0000000100111cb0
> libgvplugin_pango.6.dylib`cairo_loadimage(job=<unavailable>,
> us=0x000000010485cf30) + 128 at gvloadimage_pango.c:78
>      frame #9: 0x0000000100111dce
> libgvplugin_pango.6.dylib`pango_loadimage_cairo(job=<unavailable>,
> us=0x000000010485cf30, b=boxf at 0x00007fff5fbff4a0,
> filled=<unavailable>) + 30 at gvloadimage_pango.c:99
>      frame #10: 0x000000010000ba39
> libgvc.6.dylib`gvloadimage(job=<unavailable>, us=<unavailable>, b=boxf
> at 0x00007fff5fbff580, filled=<unavailable>, target=<unavailable>) +
> 249 at gvloadimage.c:62
>      frame #11: 0x000000010000a9a7
> libgvc.6.dylib`gvrender_usershape(job=<unavailable>,
> name=<unavailable>, a=<unavailable>, n=<unavailable>, filled='\0',
> imagescale=<unavailable>) + 1079 at gvrender.c:777
>      frame #12: 0x000000010003caa9
> libgvc.6.dylib`poly_gencode(job=0x000000010120e600, n=<unavailable>) +
> 2457 at shapes.c:2926
>      frame #13: 0x000000010004bf1e
> libgvc.6.dylib`emit_node(job=0x000000010120e600, n=0x00000001048471d0)
> + 2286 at emit.c:1908
>      frame #14: 0x000000010004a582 libgvc.6.dylib`emit_graph [inlined]
> emit_view(flags=13056, job=<unavailable>, g=<unavailable>) + 486 at
> emit.c:3338
>      frame #15: 0x000000010004a39c libgvc.6.dylib`emit_graph [inlined]
> emit_page(job=0x000000010120e600, g=0x00000001048781e0) + 2792 at
> emit.c:3439
>      frame #16: 0x00000001000498b4
> libgvc.6.dylib`emit_graph(job=0x000000010120e600,
> g=0x00000001048781e0) + 2660 at emit.c:3496
>      frame #17: 0x000000010005075c
> libgvc.6.dylib`gvRenderJobs(gvc=0x00000001002040a0,
> g=0x00000001048781e0) + 6108 at emit.c:4100
>      frame #18: 0x0000000100003d05 dot`main(argc=<unavailable>,
> argv=<unavailable>) + 1301 at dot.c:192
>      frame #19: 0x00007fff8addd5fd libdyld.dylib`start + 1
>      frame #20: 0x00007fff8addd5fd libdyld.dylib`start + 1
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