[Bug fortran/68742] FAIL: gfortran.dg/coarray/event_2.f90 -fcoarray=lib -O2 -lcaf_single -latomic execution test

["danglin at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68742

--- Comment #2 from John David Anglin <danglin at gcc dot gnu.org> ---
(gdb) r
Starting program: /test/gnu/gcc/objdir/gcc/testsuite/gfortran/event_2.exe 
warning: Private mapping of shared library text was not specified
by the executable; setting a breakpoint in a shared library which
is not privately mapped will not work.  See the HP-UX 11i v3 chatr
manpage for methods to privately map shared library text.

Program aborted. Backtrace:

Could not print backtrace: backtrace library does not support threads

Program received signal SIGSEGV, Segmentation fault.
backtrace_alloc (state=state@entry=0x0, size=size@entry=4096, 
    error_callback=error_callback@entry=0x0, data=data@entry=0x0)
    at ../../../gcc/libbacktrace/mmap.c:102
102       if (!state->threaded)
(gdb) bt
#0  backtrace_alloc (state=state@entry=0x0, size=size@entry=4096, 
    error_callback=error_callback@entry=0x0, data=data@entry=0x0)
    at ../../../gcc/libbacktrace/mmap.c:102
#1  0xc0000000003438b0 in backtrace_full (state=state@entry=0x0, 
    skip=skip@entry=0, 
    callback=callback@entry=0xc000000000347380 <full_callback>, 
    error_callback=error_callback@entry=0x800003fffdfd8e70, 
    data=data@entry=0x800003fffdff0bd8)
    at ../../../gcc/libbacktrace/backtrace.c:118
#2  0xc0000000003477e8 in _gfortrani_show_backtrace (
    in_signal_handler=in_signal_handler@entry=false)
    at ../../../gcc/libgfortran/runtime/backtrace.c:156
#3  0xc000000000348c10 in _gfortrani_sys_abort ()
    at ../../../gcc/libgfortran/runtime/error.c:178
#4  0xc00000000041e4a4 in _gfortran_abort ()
    at ../../../gcc/libgfortran/intrinsics/abort.c:33
#5  0x4000000000004ad0 in MAIN__ ()
    at /test/gnu/gcc/gcc/gcc/testsuite/gfortran.dg/coarray/event_2.f90:15
#6  main (argc=<optimized out>, argv=<optimized out>)
    at /test/gnu/gcc/gcc/gcc/testsuite/gfortran.dg/coarray/event_2.f90:89
(gdb) p state
$1 = (struct backtrace_state *) 0x0