[ITK-dev] ITK Static Initialization Issue with pthreads and atomic ints

[Bradley Lowekamp]

Greeting,

I am investigating the test failures: 

https://open.cdash.org/viewTest.php?onlyfailed&buildid=3931664

Which began occurring with upgrade to ITK 4.8.

Doing a git bisect I narrowed the problem down to the change to the atomic integer class done here:

https://github.com/InsightSoftwareConsortium/ITK/commit/33bcbd822f761e407db851d218b1e3204e6194d9

Then I was able to get a stack trace for a failing ITK test:

(gdb) 
#0  0x00a77d2d in pthread_mutex_lock () from /lib/libpthread.so.0
#1  0x086cede3 in itk::SimpleFastMutexLock::Lock (this=0x0) at /home/blowekamp/src/ITK/Modules/Core/Common/src/itkSimpleFastMutexLockPThreads.cxx:50
#2  0x0869976c in itk::MutexLockHolder<itk::SimpleFastMutexLock>::MutexLockHolder (this=0xbfffe6fc, mutex=..., noblock=false)
    at /home/blowekamp/src/ITK/Modules/Core/Common/include/itkMutexLockHolder.h:56
#3  0x086d4308 in itk::Detail::AtomicOps<4u>::PreIncrement (ref=0x8982c78) at /home/blowekamp/src/ITK/Modules/Core/Common/src/itkAtomicInt.cxx:214
#4  0x086c7e45 in itk::AtomicInt<unsigned long>::operator++ (this=0x8982c78) at /home/blowekamp/src/ITK/Modules/Core/Common/include/itkAtomicInt.h:93
#5  0x086c7dd6 in itk::TimeStamp::Modified (this=0x8c81980) at /home/blowekamp/src/ITK/Modules/Core/Common/src/itkTimeStamp.cxx:63
#6  0x086a11fb in itk::Object::Modified (this=0x8c81970) at /home/blowekamp/src/ITK/Modules/Core/Common/src/itkObject.cxx:389
#7  0x086a1346 in itk::Object::Object (this=0x8c81970) at /home/blowekamp/src/ITK/Modules/Core/Common/src/itkObject.cxx:593
#8  0x086c9be6 in itk::ObjectFactoryBase::ObjectFactoryBase (this=0x8c81970)
    at /home/blowekamp/src/ITK/Modules/Core/Common/src/itkObjectFactoryBase.cxx:476
#9  0x08379b12 in itk::MetaImageIOFactory::MetaImageIOFactory (this=0x8c81970)
    at /home/blowekamp/src/ITK/Modules/IO/Meta/src/itkMetaImageIOFactory.cxx:24
#10 0x08296048 in itk::MetaImageIOFactory::New () at /home/blowekamp/src/ITK/Modules/IO/Meta/include/itkMetaImageIOFactory.h:46
#11 0x08224ae0 in RegisterRequiredFactories ()
    at /home/blowekamp/src/ITK/Modules/Core/TestKernel/include/itkTestDriverIncludeRequiredIOFactories.h:41
#12 0x08229720 in ProcessArgumentsAndRegisterRequiredFactories (ac=0xbfffeaf0, av=0xbfffeaf4)
    at /home/blowekamp/src/ITK/Modules/Core/TestKernel/include/itkTestDriverIncludeRequiredIOFactories.h:58
#13 0x082297f7 in main (ac=1, av=0xbfffeb74) at /scratch/blowekamp/build/Modules/Video/Core/test/ITKVideoCoreTestDriver.cxx:102

So, this stack trace shows that there is a problem using pthreads during static initialization for the Object's reference counting.

As the implementation is basically that of VTK, I and wondering if anyone else knows about this problem or work arounds.

Thanks,
Brad
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