Smuxi

It looks like Environment.Exit(0) is not always returning

Smuxi 1.0+stable on Mono JIT compiler version 4.2.1 (Debian 4.2.1.102+dfsg2-5)

(gdb) bt
#0  0x00007f50d146aedd in nanosleep () at ../sysdeps/unix/syscall-template.S:81
#1  0x0000000000638308 in monoeg_g_usleep (microseconds=microseconds@entry=21220) at gdate-unix.c:53
#2  0x0000000000627cf9 in suspend_sync_nolock (id=id@entry=139985018812160, interrupt_kernel=interrupt_kernel@entry=1) at mono-threads.c:870
#3  0x0000000000628190 in mono_thread_info_safe_suspend_and_run (id=139985018812160, interrupt_kernel=interrupt_kernel@entry=1, 
    callback=callback@entry=0x584920 <suspend_thread_critical>, user_data=user_data@entry=0x7ffeae665160) at mono-threads.c:891
#4  0x000000000058535f in suspend_thread_internal (thread=0x7f50ce704330, interrupt=1) at threads.c:4529
#5  0x0000000000586b65 in mono_thread_suspend_all_other_threads () at threads.c:3152
#6  0x0000000000538b76 in ves_icall_System_Environment_Exit (result=0) at icall.c:6006
#7  0x000000004140eac2 in ?? ()
#8  0x00000000029dae10 in ?? ()
#9  0x00007ffeae665b30 in ?? ()
#10 0x0000000000000005 in ?? ()
#11 0x00007ffeae665b30 in ?? ()
#12 0x0000000000000004 in ?? ()
#13 0x00007ffeae665ca8 in ?? ()
#14 0x00000000413abd6e in ?? ()
#15 0x00007ffeae665770 in ?? ()
#16 0x00007ffeae665610 in ?? ()
#17 0x000000004140cccf in ?? ()
#18 0x00000000029dae10 in ?? ()
#19 0x00007ffeae665780 in ?? ()
#20 0x00007ffeae6657f0 in ?? ()
#21 0x00007f50d0800ab8 in ?? ()
#22 0x00007f50d0afe4b0 in ?? ()
#23 0x0000000000000000 in ?? ()

(gdb) mono_backtrace 23
#0  0x00007f50d146aedd in nanosleep () at ../sysdeps/unix/syscall-template.S:81
81    ../sysdeps/unix/syscall-template.S: No such file or directory.
#1  0x0000000000638308 in monoeg_g_usleep (microseconds=microseconds@entry=21220) at gdate-unix.c:53
53    gdate-unix.c: No such file or directory.
#2  0x0000000000627cf9 in suspend_sync_nolock (id=id@entry=139985018812160, interrupt_kernel=interrupt_kernel@entry=1) at mono-threads.c:870
870    mono-threads.c: No such file or directory.
#3  0x0000000000628190 in mono_thread_info_safe_suspend_and_run (id=139985018812160, interrupt_kernel=interrupt_kernel@entry=1, 
    callback=callback@entry=0x584920 <suspend_thread_critical>, user_data=user_data@entry=0x7ffeae665160) at mono-threads.c:891
891    in mono-threads.c
#4  0x000000000058535f in suspend_thread_internal (thread=0x7f50ce704330, interrupt=1) at threads.c:4529
4529    threads.c: No such file or directory.
#5  0x0000000000586b65 in mono_thread_suspend_all_other_threads () at threads.c:3152
3152    in threads.c
#6  0x0000000000538b76 in ves_icall_System_Environment_Exit (result=0) at icall.c:6006
6006    icall.c: No such file or directory.
#7 0x4140eac2 in  (wrapper managed-to-native) System.Environment:Exit (int) + 0x52 (0x4140ea70 0x4140eaee) [0x1921100 - smuxi-frontend-gnome.exe]
#8  0x00000000029dae10 in ?? ()
#9  0x00007ffeae665b30 in ?? ()
#10 0x0000000000000005 in ?? ()
#11 0x00007ffeae665b30 in ?? ()
#12 0x0000000000000004 in ?? ()
#13 0x00007ffeae665ca8 in ?? ()
#14 0x413abd6e in <0x413abd6e - JIT trampoline for System.Environment:Exit (int)>
#15 0x00007ffeae665770 in ?? ()
#16 0x00007ffeae665610 in ?? ()
#17 0x4140cccf in  Smuxi.Frontend.Gnome.Frontend:Quit () + 0x4bf (0x4140c810 0x4140ccd5) [0x1921100 - smuxi-frontend-gnome.exe]
#18 0x00000000029dae10 in ?? ()
#19 0x00007ffeae665780 in ?? ()
#20 0x00007ffeae6657f0 in ?? ()
#21 0x00007f50d0800ab8 in ?? ()
#22 0x00007f50d0afe4b0 in ?? ()
(gdb) 

This seems to be the bug in Mono 4.x with a minimal code repro here: https://bugzilla.xamarin.com/show_bug.cgi?id=33020

This is a Mono 4.x bug and was fixed in https://github.com/mono/mono/commit/23e34d77f2fd23ab5d61f6ba4aa905817f57668a