https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82393
--- Comment #13 from Didier G <didu31 at hotmail dot fr> --- gnat.dg/entry_queues.adb debug execution : (gdb) run Starting program: /home/didier/entry_queues.exe [New Thread 8264.0x299c] [New Thread 8264.0x1950] [New Thread 8264.0x1a94] [New Thread 8264.0x3508] Program received signal SIGSEGV, Segmentation fault. ___chkstk_ms () at /cygdrive/c/Users/didier/git/gcc/libgcc/config/i386/cygwin.S:146 146 orq $0x0, (%rcx) /* probe there */ (gdb) info registers rax 0x283b0 164784 rbx 0xffffcb00 4294953728 rcx 0xffe037f0 4292884464 rdx 0x0 0 rsi 0xffffc7f0 4294952944 rdi 0x880e80 8916608 rbp 0xffffc870 0xffffc870 rsp 0xffffc7d8 0xffffc7d8 r8 0x0 0 r9 0x1101d0 1114576 r10 0x0 0 r11 0x1101d0 1114576 r12 0x0 0 r13 0x0 0 r14 0x1101d0 1114576 r15 0x0 0 rip 0x1004198f6 0x1004198f6 <___chkstk_ms+22> eflags 0x10206 [ PF IF RF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) c Continuing. raised STORAGE_ERROR : EXCEPTION_STACK_OVERFLOW [Thread 8264.0x1a94 exited with code 1] [Thread 8264.0x3508 exited with code 1] [Inferior 1 (process 8264) exited with code 01]