https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81591
--- Comment #5 from Jakub Sistek <sistek at seznam dot cz> --- Created attachment 41879 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41879&action=edit test case producing an error Hello Jakub, thanks for looking into it. I have been able to isolate our problem into the attached simple C code. It is compiled with: CC = ${HOME}/software/gcc/gcc_installed/bin/gcc CFLAGS = ${FPIC} -std=c99 -fopenmp -O3 -g LIBS = -L${HOME}/software/gcc/gcc_installed/lib64 -Wl,-rpath,${HOME}/software/gcc/gcc_installed/lib64 If run with: OMP_NUM_THREADS=4 OMP_MAX_TASK_PRIORITY=0 ./nested_omp_tasks it produces correct output. Matrix after update: 1 0 0 0 1 1 0 0 1 1 1 0 1 1 1 1 When run with nonzero max priority, e.g. by OMP_NUM_THREADS=4 OMP_MAX_TASK_PRIORITY=10 ./nested_omp_tasks it finishes with an error: libgomp: priority_tree_next_task: t1 != t2 This error is enabled by the _LIBGOMP_CHECKING_. I was getting segfaults if the checking is not enabled. Thanks for investigating it! Best wishes, Jakub
