[llvm-bugs] [Bug 41453] New: calling omp_unset_lock() on lock never set, or already unset drops core

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41453

            Bug ID: 41453
           Summary: calling omp_unset_lock() on lock never set, or already
                    unset drops core
           Product: OpenMP
           Version: unspecified
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime Library
          Assignee: unassignedbugs at nondot.org
          Reporter: itzkowitzmarty at gmail.com
                CC: llvm-bugs at lists.llvm.org

It gives core dump within the runtime
    __kmp_release_queuing_lock(0x0, 0xffffffff00000000, 0x0, 0x0, 0x1, 0x0), at
0x7fb7121e3278
using the libomp.so that was built with spack install llvm-develop,
and compiled with gcc.

It gives an assertion failure with the libomp.so that is currently under
development for OMPT support.

I suspect the core dump is independent of the compiler.

Program to reproduce and Makefile below.
-----------------------------------------------------------
// lockbug -- reproduce assertion failure in libomp.so, when user
//      calls omp_unset_lock on a lock that was never set.
//      It also will fail on a duplicate free

#include <omp.h>

int main(int argc, char **argv)
{
        omp_lock_t      lock1;
        omp_set_num_threads(4);

        // initialize the lock
        omp_init_lock(&lock1);
#pragma omp parallel
        {   
#pragma omp master
            {   
                omp_unset_lock(&lock1); // lock was never set
            }   
        }   
}
-----------------------------
GCC=~/bin/linux-rhel7-x86_64/gcc-4.8.5/gcc-7.3.0-2bfpv2u6zl5wux44mswawrkpzh2fillo/bin/gcc
OMP_PATH=~/bin/linux-rhel7-x86_64/gcc-4.8.5//gcc-7.3.0/llvm-develop-rm4ypf2twg2yxshj5ptucddikviq63to/
INCPATH=-I$(OMP_PATH)/lib/clang/7.0.1/include/

LIBPATH=-Wl,-rpath=$(OMP_PATH)/lib -L$(OMP_PATH)/lib 
LIBS=$(LIBPATH) -lomp

SOURCES=lockbug.c

TARGETS=lockbug

default all:$(TARGETS)

lockbug: $(SOURCES)
        $(GCC) -g -o $@ $(SOURCES) -fopenmp $(INCPATH) $(LIBS)

clean:
        /bin/rm -f $(TARGETS) core*

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