Conversation with #inferno at Mon Jan  7 18:09:28 2013 on powerman@irc.freenode.net (irc)
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(03:29:03) doublec: leetspete: I get a segfault running wm/wm on emu-sdl on 64bit gentoo fyi
(03:49:29) leetspete: doublec: brother could ye spare a coredump
(04:03:45) doublec: leetspete: sure, I'm just about to try running it through the debugger
(04:04:59) doublec: leetspete: http://pastebin.com/jcE99unN
(04:10:25) doublec: leetspete: if I move SDL_Init from sdl_proc and put it in 'main' then things work
(04:10:52) doublec: I assume some thread/stack thing is going wrong
(04:12:37) doublec: leetspete: my hacky workaround: http://cd.pn/emu.patch
(04:26:57) leetspete: doublec: Huh...pulseaudio.
(04:27:12) leetspete: Wonder if it hates getting calls from non-main threads?
(04:27:26) leetspete: I don't have a pulseaudio driver backing my SDL libs.
(04:29:48) doublec: yeah that could be it
(04:30:19) leetspete: doublec: Do you still get the segfault if you export SDL_AUDIODRIVER=dsp ?
(04:32:17) doublec: No I don't get the segfault then
(04:32:25) doublec: I did get an assertion though when exiting 
(04:32:29) doublec: but it's intermittent
(04:33:08) doublec: leetspete: http://pastebin.com/DpnVxuDw is assertion on exit
(04:34:13) leetspete: doublec: I should probably figure out what to do about that.  atexit() doesn't work inside emu, ensuring SDL_Quit() gets called is somewhat tricky.
(04:34:26) leetspete: Or it's really simple and I just don't know.
(04:34:31) doublec: this says not to call SDL video functions on anything but the main thread: http://wiki.libsdl.org/moin.cgi/FAQDevelopment
(04:38:23) leetspete: As long as it's always the same thread that called SDL_Init(), it is supposedly fine per the authors.
(04:38:38) leetspete: On the other hand, I have no idea about how that works with PulseAudio.
(04:39:51) leetspete: doublec: I'll need a bit of time to investigate, but extreme thanks.
(04:40:55) doublec: np
(04:41:49) doublec: SDL_AUDIODRIVER=alsa works too
(04:41:55) doublec: Possibly a pulseaudio bug
(04:53:00) doublec: leetspete: valgrind says possible stack overflow. Do inferno threads runs with a smaller stack?
(04:53:54) leetspete: doublec: Ah, that makes sense.  They do indeed, depending on the platform.
(04:55:35) doublec: leetspete: that was it
(04:55:53) doublec: in emu/port/kproc-pthreads.c it sets a stack size
(04:56:06) doublec: leetspete: if I remove that then it runs fine so I assume it's setting it too small
(04:56:11) leetspete: And PulseAudio happens to trigger this.
(04:56:36) doublec: PulseAudio is using iconv_open for logging and it calls a function that uses a bit of stack unfortunately
(04:57:31) leetspete: (╯°□°）╯︵ ┻━┻
(04:58:09) leetspete: I should probably actually just not enable sound until I write a sound driver for Inferno.
(04:58:27) leetspete: And SDL_Net probably shouldn't get initialized, either.
(04:58:36) leetspete: But the thread stack issue, that's sticky.
(05:05:33) leetspete: Hm...the KPX11 flag to kproc() gives the thread extra stack...
(05:07:15) leetspete: Heh, for the X thread's stack, Inferno allocates 256k.
(05:07:47) doublec: No doubt they hit a similar issue :)
(05:07:52) leetspete: I'd not seen this:  CTRLC   = 'C'-'@'
(05:08:11) leetspete: That's clever and easy to remember.  '@' happens to be 64 in ASCII.
(05:08:38) doublec: heh
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