.
Thread 4 (Thread 0x7f49e7a2c700 (LWP 22924)):
#0  0x00007f49f2fe1bf9 in __GI___poll (fds=0x5574d86f95c0, nfds=3, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007f49f3529439 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f49f35297d2 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f49f3b15e16 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f49f3550e05 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f49f32c56db in start_thread (arg=0x7f49e7a2c700) at pthread_create.c:463
        pd = 0x7f49e7a2c700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139955395544832, 6886530250945073630, 139955395542144, 0, 93960335636480, 140732002476640, -6844889226474941986, -6844846230450466338}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6  0x00007f49f2fee88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
.
Thread 3 (Thread 0x7f49e512b700 (LWP 22928)):
#0  0x00007f49f32cb9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f49cffff1e4 <bmalloc::SafePerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+68>) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
        __ret = -512
        oldtype = 0
        err = <optimized out>
        spin = 0
        buffer = {__routine = 0x7f49f32cb690 <__condvar_cleanup_waiting>, __arg = 0x7f49e512aa90, __canceltype = -805330232, __prev = 0x0}
        cbuffer = {wseq = 7, cond = 0x7f49cffff1b8 <bmalloc::SafePerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+24>, mutex = 0x5574d89bcf40, private = 0}
        err = <optimized out>
        g = 1
        flags = <optimized out>
        signals = <optimized out>
        result = 0
        seq = 3
#1  0x00007f49f32cb9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5574d89bcf40, cond=0x7f49cffff1b8 <bmalloc::SafePerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+24>) at pthread_cond_wait.c:502
        spin = 0
        buffer = {__routine = 0x7f49f32cb690 <__condvar_cleanup_waiting>, __arg = 0x7f49e512aa90, __canceltype = -805330232, __prev = 0x0}
        cbuffer = {wseq = 7, cond = 0x7f49cffff1b8 <bmalloc::SafePerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+24>, mutex = 0x5574d89bcf40, private = 0}
        err = <optimized out>
        g = 1
        flags = <optimized out>
        signals = <optimized out>
        result = 0
        seq = 3
#2  0x00007f49f32cb9f3 in __pthread_cond_wait (cond=0x7f49cffff1b8 <bmalloc::SafePerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+24>, mutex=0x5574d89bcf40) at pthread_cond_wait.c:655
#3  0x00007f49e9e682f0 in std::condition_variable::wait(std::unique_lock<std::mutex>&) () at /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007f49cfd9ebd7 in bmalloc::Scavenger::threadRunLoop() () at /usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.0.so.18
#5  0x00007f49e9e6e473 in  () at /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00007f49f32c56db in start_thread (arg=0x7f49e512b700) at pthread_create.c:463
        pd = 0x7f49e512b700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139955352549120, 6886530250945073630, 139955352546432, 0, 93960338355072, 140732002478064, -6844885516160069154, -6844846230450466338}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#7  0x00007f49f2fee88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
.
Thread 2 (Thread 0x7f49e822d700 (LWP 22923)):
#0  0x00007f49f2fe1bf9 in __GI___poll (fds=0x5574d86e8a10, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007f49f3529439 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f49f352954c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f49f3529591 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f49f3550e05 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f49f32c56db in start_thread (arg=0x7f49e822d700) at pthread_create.c:463
        pd = 0x7f49e822d700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139955403937536, 6886530250945073630, 139955403934848, 0, 93960335284000, 140732002476256, -6844892526620438050, -6844846230450466338}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6  0x00007f49f2fee88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
.
Thread 1 (Thread 0x7f49f53bc280 (LWP 22922)):
#0  0x00005574d6b0321c in  ()
#1  0x00007f49f35290f5 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f49f35294c0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f49f35297d2 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f49f4849555 in gtk_main () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#5  0x00005574d6b02aa8 in main ()