#2020 Freeze in SDL_CloseAudio when using PulseAudio?

[TeeEmCee]

About 3 times in the last couple of weeks I have seen Custom freeze when quitting, while using gfx_sdl/music_sdl on GNU/Linux (Slackware64-current), with FB 0.23 (32 bit), SDL 1.2.15, SDL_mixer 1.2.12. I think in all cases I had been resizing the window (since I've been testing that a lot lately). I can't easily reproduce it, it happens rarely. I haven't seen Game freeze in the same way. At least twice I attached gdb, and saw that the freeze was in a pthread_join in SDL_CloseAudio:

(gdb) bt
#0  0xf76ed93b in pthread_join () from /lib/libpthread.so.0
#1  0xf767f864 in ?? () from /usr/lib/libSDL-1.2.so.0
#2  0xf763703e in SDL_WaitThread () from /usr/lib/libSDL-1.2.so.0
#3  0xf762eb1a in SDL_AudioQuit () from /usr/lib/libSDL-1.2.so.0
#4  0xf762d92d in SDL_QuitSubSystem () from /usr/lib/libSDL-1.2.so.0
#5  0xf762e50b in SDL_CloseAudio () from /usr/lib/libSDL-1.2.so.0
#6  0xf75958b8 in Mix_CloseAudio () from /usr/lib/libSDL_mixer-1.2.so.0
#7  0x08210021 in MUSIC_CLOSE () at music_sdl.bas:187
#8  0x082175fb in CLOSEMUSIC () at allmodex.bas:836
#9  0x0812c17a in CLEANUP_AND_TERMINATE (SHOW_QUIT_MSG=<error reading="" variable="">) at custom.bas:733
#10 0x0812ae09 in CHOOSE_RPG_TO_OPEN (RPG_BROWSE_DEFAULT=...) at custom.bas:582
#11 0x0813a45d in main (__FB_ARGC__=<error reading="" variable="">, __FB_ARGV__=<error reading="" variable="">) at custom.bas:263
(gdb) info threads
  Id   Target Id         Frame 

* 1    Thread 0xf77a8700 (LWP 13600) "ohrrpgce-custom" 0xf76ed93b in pthread_join () from /lib/libpthread.so.0
  2    Thread 0xf200db40 (LWP 13605) "ohrrpgce-custom" 0xf76f5ac1 in read () from /lib/libpthread.so.0
  3    Thread 0xf6f95b40 (LWP 13601) "ohrrpgce-custom" 0xf711c28c in nanosleep () from /lib/libc.so.6
(gdb) thread 2
[Switching to thread 2 (Thread 0xf200db40 (LWP 13605))]
#0  0xf76f5ac1 in read () from /lib/libpthread.so.0
(gdb) bt
#0  0xf76f5ac1 in read () from /lib/libpthread.so.0
#1  0xf62bc86a in pa_read () from /usr/lib/pulseaudio/libpulsecommon-7.1.so
#2  0xf634ff5a in ?? () from /usr/lib/libpulse.so.0
#3  0xf6350060 in pa_mainloop_prepare () from /usr/lib/libpulse.so.0
#4  0xf6350801 in pa_mainloop_iterate () from /usr/lib/libpulse.so.0
#5  0xf765e6b7 in ?? () from /usr/lib/libSDL-1.2.so.0
#6  0xf762e267 in ?? () from /usr/lib/libSDL-1.2.so.0
#7  0xf7636e11 in ?? () from /usr/lib/libSDL-1.2.so.0
#8  0xf767f6eb in ?? () from /usr/lib/libSDL-1.2.so.0
#9  0xf76ec696 in start_thread () from /lib/libpthread.so.0
#10 0xf715f25e in clone () from /lib/libc.so.6
(gdb) thread 3
[Switching to thread 3 (Thread 0xf6f95b40 (LWP 13601))]
#0  0xf711c28c in nanosleep () from /lib/libc.so.6
(gdb) bt
#0  0xf711c28c in nanosleep () from /lib/libc.so.6
#1  0xf7155e3b in usleep () from /lib/libc.so.6
#2  0x082da25a in bg_thread ()
#3  0xf76ec696 in start_thread () from /lib/libpthread.so.0
#4  0xf715f25e in clone () from /lib/libc.so.6
</error></error></error>

Notice /usr/lib/libpulse.so in the backtrace. I think what has changed is that Slackware recently switched to PulseAudio, and I see that I installed those upgrades on Jan 23. I don't remember having this problem before the last few weeks.

[TeeEmCee]

I didn't look far, but I notice a thread discussing pretty much the same problem in SDL2.
http://comments.gmane.org/gmane.comp.lib.sdl/61923
A patch containing a "don't join the audio thread" workaround was posted but I don't know whether it was applied.

I think these sort of problems are going to keep building up on SDL 1.2, which isn't actively maintained, while SDL 2.0 gets fixes.

[TeeEmCee]

I've also seen once or twice another bug in pulseaudio: when starting ohrrpgce-game it immediately died with the message:
Assertion 't = find_next_time_event(m)' failed at pulse/mainloop.c:719, function calc_next_timeout(). Aborting.

Searching the web I see a number of reports of this, eg https://sourceforge.net/p/openmsx/bugs/555/, but no mention of a fix. What they all have in common is using SDL 1.2 with pulseaudio.

[TeeEmCee]

This bug has been migrated to our new issue tracker on Github: https://github.com/ohrrpgce/ohrrpgce/issues/1079