#0  0x00007ffba23833a5 in __GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
        resultvar = 0
        pid = <optimized out>
        selftid = <optimized out>
#1  0x00007ffba2386b0b in __GI_abort () at abort.c:92
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0, sa_sigaction = 0}, sa_mask = {__val = {0, 140718734916512, 140718749870536, 0, 0, 0, 0, 4294967295, 0, 0, 4293, 9306240, 0, 0, 140718677128592, 0}}, sa_flags = -1560645708, sa_restorer = 0x5}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00000000004912b1 in mono_handle_native_sigsegv (signal=<optimized out>, ctx=<optimized out>) at mini-exceptions.c:2245
        sa = {__sigaction_handler = {sa_handler = 0, sa_sigaction = 0}, sa_mask = {__val = {0 <repeats 16 times>}}, sa_flags = 0, sa_restorer = 0}
        jit_tls = <optimized out>
#3  0x00000000004e064f in mono_arch_handle_altstack_exception (sigctx=0x7ffba31b6bc0, fault_addr=<optimized out>, stack_ovf=0) at exceptions-amd64.c:957
        exc = <optimized out>
        ctx = 0x7ffba31b6bc0
        ji = 0x0
        sp = <optimized out>
        frame_size = <optimized out>
#4  0x000000000041b187 in mono_sigsegv_signal_handler (_dummy=11, info=0x7ffba31b6cf0, context=0x7ffba31b6bc0) at mini.c:5882
        ji = 0x0
        jit_tls = 0x19684b0
        fault_addr = <optimized out>
        ctx = 0x7ffba31b6bc0
#5  0x00007ffba26fc040 in _L_unlock_16 () from /tmp/tmpsVs6dc/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#6  0x00007ffba26fc045 in _L_unlock_16 () from /tmp/tmpsVs6dc/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#7  0x00007ffba26fc034 in _L_unlock_16 () from /tmp/tmpsVs6dc/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)