[ 0:01]   | load /home/xrockai/src/divine/nightly/test/libcxx/div-extra/future-starts.cpp future-starts.cpp
[ 0:01]   | expect --result error --location future-starts.cpp:15
[ 0:01]   | expect --trace FAULT: --trace-count 1
[ 0:01]   | cc -o testcase.bc -std=c++14 future-starts.cpp
[ 0:01]   | verify --max-memory 4GiB --max-time 600 --threads 2 --report-filename verify.out --leakcheck exit testcase.bc
[ 0:01] compiling future-starts.cpp
[ 0:01] loading bitcode … DiOS … LART … RR … constants … done
[ 0:10] booting … done
[ 0:10] states per second: 28.5714
[ 0:10] state count: 5
[ 0:10] mips: 0.22
[ 0:10] 
[ 0:10] error found: yes
[ 0:10] error trace: |
[ 0:10]   FAULT: future-starts.cpp:15: auto main()::(anonymous class)::operator()() const: assertion 'false' failed
[ 0:10]   [1] FATAL: assertion failure in userspace
[ 0:10] 
[ 0:10] active stack:
[ 0:11]   - symbol: void __dios::FaultBase::handler<__dios::Context>(_VM_Fault, _VM_Frame*, void (*)())
[ 0:12]     location: /dios/sys/fault.hpp:118
[ 0:12]   - symbol: __dios_fault
[ 0:12]     location: /dios/arch/divm/fault.c:12
[ 0:12]   - symbol: __assert_fail
[ 0:12]     location: /dios/libc/_PDCLIB/assert.c:24
[ 0:12]   - symbol: main::$_0::operator()() const
[ 0:12]     location: future-starts.cpp:15
[ 0:12]   - symbol: int std::__2::__async_func<main::$_0>::__execute<>(std::__2::__tuple_indices<>)
[ 0:12]     location: /dios/libcxx/include/type_traits:3530
[ 0:12]   - symbol: std::__2::__async_func<main::$_0>::operator()()
[ 0:12]     location: /dios/libcxx/include/future:2313
[ 0:12]   - symbol: std::__2::__async_assoc_state<int, std::__2::__async_func<main::$_0> >::__execute()
[ 0:12]     location: /dios/libcxx/include/future:981
[ 0:12]   - symbol: void* std::__2::__thread_proxy<std::__2::tuple<std::__2::unique_ptr<std::__2::__thread_struct, std::__2::default_delete<std::__2::__thread_struct> >, void (std::__2::__async_assoc_state<int, std::__2::__async_func<main::$_0> >::*)(), std::__2::__async_assoc_state<int, std::__2::__async_func<main::$_0> >*> >(void*)
[ 0:12]     location: /dios/libcxx/include/type_traits:3471
[ 0:12]   - symbol: __pthread_start
[ 0:12]     location: /dios/libc/pthread/pthread-init.cpp:79
[ 0:12]   - symbol: __pthread_entry
[ 0:12]     location: /dios/libc/pthread/pthread-core.cpp:50
[ 0:12] + divine sim --batch --skip-init --load-report verify.out
[ 0:12] 
[ 0:19]            ^       —————.   —.—  .     .  —.—  .     .  .—————    .    .
[ 0:19]           ———      |     |   |   |     |   |   |\    |  |         |    |
[ 0:19]          —(o)—     |     |   |   |     |   |   |  \  |  |————     '————|
[ 0:19]         ———————    |     |   |    \   /    |   |    \|  |              |
[ 0:19]        —————————   —————'   —'—     '     —'—  '     '  '—————         '
[ 0:19] 
[ 0:19] Welcome to 'divine sim', an interactive debugger. Type 'help' to get started.
[ 0:19] traced states:
[ 0:19] ▶ state    #3 [new] -- active threads: 0:0 [0:1] --
[ 0:19] T: FAULT: future-starts.cpp:15: auto main()::(anonymous class)::operator()() const: assertion 'false' failed
[ 0:19] # executing void __dios::FaultBase::handler<{Context}>(_VM_Fault, _VM_Frame*, void (*)()) at /dios/sys/fault.hpp:118
[ 0:19] # NOTE: $frame in __dios_fault
[ 0:19] > backtrace
[ 0:19]   void __dios::FaultBase::handler<{Context}>(_VM_Fault, _VM_Frame*, void (*)()) at /dios/sys/fault.hpp:118
[ 0:19]   __dios_fault at /dios/arch/divm/fault.c:12
[ 0:19]   __assert_fail at /dios/libc/_PDCLIB/assert.c:24
[ 0:19]   main::$_0::operator()() const at future-starts.cpp:15
[ 0:19]   int std::__2::__async_func<main::$_0>::__execute<>(std::__2::__tuple_indices<>) at /dios/libcxx/include/type_traits:3530
[ 0:19]   std::__2::__async_func<main::$_0>::operator()() at /dios/libcxx/include/future:2313
[ 0:19]   std::__2::__async_assoc_state<int, std::__2::__async_func<main::$_0> >::__execute() at /dios/libcxx/include/future:981
[ 0:19]   void* std::__2::__thread_proxy<std::__2::tuple<std::__2::unique_ptr<std::__2::__thread_struct, std::__2::default_delete<std::__2::__thread_struct> >, void (std::__2::__async_assoc_state<int, std::__2::__async_func<main::$_0> >::*)(), std::__2::__async_assoc_state<int, std::__2::__async_func<main::$_0> >*> >(void*) at /dios/libcxx/include/type_traits:3471
[ 0:19]   __pthread_start at /dios/libc/pthread/pthread-init.cpp:79
[ 0:19]   __pthread_entry at /dios/libc/pthread/pthread-core.cpp:50
[ 0:19] # executing void __dios::FaultBase::handler<{Context}>(_VM_Fault, _VM_Frame*, void (*)()) at /dios/sys/fault.hpp:118
[ 0:20] # NOTE: $frame in __dios_fault