(gdb) t a a bt
Thread 4 (Thread 1073822016 (LWP 4591)):
#0 0x00002b105d32a231 in fmod () from /lib64/libpthread.so.0
#1 0x00000000004bfff0 in collection_thread (unused=<value optimized out>) at collection.c:34
#2 0x00002b105d323143 in start_thread () from /lib64/libpthread.so.0
#3 0x00002b105d64974d in clone () from /lib64/libc.so.6
#4 0x0000000000000000 in ?? ()
Thread 3 (Thread 1075988800 (LWP 4592)):
#0 0x00002b105d3271c6 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00000000004c8fa5 in timedwait_signal_poll_cond (cond=0x2aaaaad36268, mutex=0x2aaaaad36240, timeout=0x1, alertable=-1)
at handles.c:1413
#2 0x00000000004cb34d in _wapi_handle_timedwait_signal_handle (handle=<value optimized out>, timeout=0x0, alertable=-1428987328)
at handles.c:1493
#3 0x00000000004cbcab in WaitForSingleObjectEx (handle=0x404, timeout=4294967295, alertable=0) at wait.c:200
#4 0x000000000051d0a1 in finalizer_thread (unused=<value optimized out>) at gc.c:819
#5 0x0000000000476a69 in start_wrapper (data=<value optimized out>) at threads.c:313
#6 0x00000000004c41e3 in thread_start_routine (args=0x2aaaaadac618) at threads.c:253
#7 0x00000000004da0d2 in GC_start_routine (arg=<value optimized out>) at pthread_support.c:1357
#8 0x00002b105d323143 in start_thread () from /lib64/libpthread.so.0
#9 0x00002b105d64974d in clone () from /lib64/libc.so.6
#10 0x0000000000000000 in ?? ()
Thread 2 (Thread 1078221120 (LWP 4593)):
#0 0x00002b105d329548 in __lll_mutex_lock_wait () from /lib64/libpthread.so.0
#1 0x00002b105d32c290 in fmod () from /lib64/libpthread.so.0
#2 0xffffffffffffffff in ?? ()
#3 0x00002b105d3258ec in fmod () from /lib64/libpthread.so.0
#4 0x000000000088c8a0 in ?? ()
#5 0x00000000007e1ff8 in ?? ()
#6 0x00000000006f0930 in ?? ()
#7 0x0000000000887398 in ?? ()
#8 0x0000000040241dd0 in ?? ()
#9 0x0000000040241d73 in ?? ()
#10 0x0000000000710970 in ?? ()
#11 0x0000000000712dd8 in ?? ()
#12 0x0000000040241d50 in ?? ()
#13 0x00002b105d1cf7b9 in g_str_equal () from /opt/gnome/lib64/libglib-2.0.so.0
#14 0x00000000004e7275 in mono_icall_get_wrapper (callinfo=0x6ccc48) at mini.c:7804
#15 0x0000000000000000 in ?? ()
Thread 1 (Thread 47349287861024 (LWP 4590)):
#0 0x00002b105d329548 in __lll_mutex_lock_wait () from /lib64/libpthread.so.0
#1 0x00002b105d32c290 in fmod () from /lib64/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
#2 0x0000000000876098 in ?? ()
#3 0x00002b105d3258ec in fmod () from /lib64/libpthread.so.0
#4 0x0000000000000028 in ?? ()
#5 0x00002b105d3252a0 in fmod () from /lib64/libpthread.so.0
#6 0x000000000077db10 in ?? ()
#7 0x00002b105d1b2861 in g_list_prepend () from /opt/gnome/lib64/libglib-2.0.so.0
#8 0x0000000000463e92 in mono_mb_add_data (mb=<value optimized out>, data=0x0) at marshal.c:1146
#9 0x00000000006f6080 in ?? ()
#10 0x00000000006f6080 in ?? ()
#11 0x0000000000493c1e in mono_loader_unlock () at loader.c:1766
#12 0x00000000008760a8 in ?? ()
#13 0x000000000073bff0 in ?? ()
#14 0x00000000008760a8 in ?? ()
#15 0x000000000073bff0 in ?? ()
#16 0x000000000047141e in mono_marshal_get_native_wrapper (method=0x73bff0) at marshal.c:2715
#17 0x00000000004f8ba6 in mono_method_to_ir (cfg=0x2aaaab800d90, method=0x739d78, start_bblock=0x2aaaab801130,
end_bblock=0x2aaaab801238, locals_offset=2, return_var=0x0, dont_inline=0x77e2a8, inline_args=0x0, inline_offset=0,
is_virtual_call=0) at mini.c:4564
#18 0x0000000000502485 in mini_method_compile (method=0x739d78, opts=1, domain=<value optimized out>,
run_cctors=<value optimized out>, compile_aot=<value optimized out>, parts=0) at mini.c:10247
#19 0x0000000000503cba in mono_jit_compile_method (method=0x739d78) at mini.c:10612
#20 0x000000000043f9c9 in mono_magic_trampoline (regs=0x7fff4dd466f8, code=0x0, m=0x2,
tramp=0xffffffffffffffff <Address 0xffffffffffffffff out of bounds>) at mini-trampolines.c:27
#21 0x000000004000013a in ?? ()
#22 0x00002aaaab6bc100 in ?? ()
#23 0x000000000043fad0 in mono_magic_trampoline (regs=<value optimized out>, code=0x2aaaab62a708 "HS\200", m=<value optimized out>,
tramp=<value optimized out>) at mini-trampolines.c:58
#24 0x000000004000013a in ?? ()
#25 0x00002aaaab62a708 in ?? ()
#26 0x000000004000013a in ?? ()
#27 0x0000000000000000 in ?? ()
#0 0x00002b105d329548 in __lll_mutex_lock_wait () from /lib64/libpthread.so.0