Kevin -
Am Mittwoch, 28. November 2012 20:45:29 UTC+1 schrieb kevin360:
> Ok, I shrunk the images down so they are smaller in byte size, but
> they are still fairly large in dimension. You can download the two of
> them here:
> http://www.bluelavalamp.net/hugin/enfuse-openmp-segfault/
THX. I downloaded them.
> I then re-compiled adding in -g as you said and ran in gdb.
> Here's the output then itsegfaulted:
> (gdb) run
> Starting program: /usr/local/bin/enfuse-test 0.jpg 1.jpg -o
crash_small_test.tif
> ...
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0x7fffca88a700 (LWP 2237)]
> operator() (this=0x89cc00 <Twister>) at
/usr/include/boost/random/mersenne_twister.hpp:454
> 454 UIntType z = x[i];
> (gdb)
This is exactly what I was afraid of:
segfault out of the blue. However, our code,
which uses the Mersenne Twister RNG is tried and
true; the Boost RNG library supposedly is even
more mature. Thus, my conclusion is that the
multi-threading implementation in use wreaks
havoc to unrelated parts of your program.
> I did 20 runs of enfuse and got 8 segfaults.
I enfused your image pair here on a
4-way, 64-bit Debian-6.x box using three
different tool chains:
$ g++ --version; clang++ --version; icpc --version
g++ (Debian 4.6.3-14) 4.6.3
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.
clang version 3.2 (trunk 167223)
Target: x86_64-unknown-linux-gnu
Thread model: posix
icpc (ICC) 13.0.1 20121010
Copyright (C) 1985-2012 Intel Corporation. All rights reserved.
with CXXFLAGS something like `-march=native -O2'
or `-xHost -O2'.
Each binary run 25 times without any problems
and produced an expected output. (I checked the
latter only once per binary.) So, everything
looks fine here.
Furthermore, neither Helgrind, nor DRD did find
any thread errors in Enfuse. They just chewed
up humongous amounts of CPU cycles.
/Chris
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