https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102394
--- Comment #2 from Rimvydas (RJ) <rimvydas.jas at gmail dot com> --- Also with updated toolchain to glibc-2.34 (still not sure if this was not happening before) noticed that very rarely one test in particular sometimes fail during parallel check-gcc-fortran. Running explicitly is more reproducible, STOP 1, irnk == -1000: make -j20 check-gcc-fortran RUNTESTFLAGS=dg.exp=PR93963.f90 FAIL: gfortran.dg/PR93963.f90 -O1 execution test === gfortran Summary === # of expected passes 11 # of unexpected failures 1