[Bug 60929] [r600-llvm] mono games with opengl are blocking on start

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=60929

--- Comment #14 from Torsten Kaiser <x11@ariolc.dyndns.org> ---
Created attachment 84467
  --> https://bugs.freedesktop.org/attachment.cgi?id=84467&action=edit
apitrace from hanging startup of OpenRA

I'm seeing the same problem with the mono game OpenRA from http://open-ra.org/
on an RV730 PRO [Radeon HD 4650] with mesa-9.2-rc1 (but early mesa versions
showed the same behaviour).

With Gentoo I'm able to switch the R600_LLVM via useflag, but as soon as I'm
using a mesa version with this enabled OpenRA will no longer start. It will
just display a black window, the loading symbols never apear.

Running apitrace gives (full apitrace as attachment):
10 glXChooseVisual(dpy = 0x15fbef0, [snip]) = &{visual = 0x1661f58, [snip]}
11 glXCreateContext(dpy = 0x15fbef0, vis = &{visual = 0x1661f58, [snip]) =
0x16734e0
12 glXMakeCurrent(dpy = 0x15fbef0, drawable = 20971535, ctx = 0x16734e0) = True
43 glXMakeCurrent(dpy = 0x15fbef0, drawable = 20971535, ctx = 0x16734e0) = True

Trying gdb it seems one of the mono threads get stuck in
radeon_drm_cs_emit_ioctl(), the other 7 threads look like mono internal things
relating to its garbage collector.

strace gives:
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC, 0) = 7
connect(7, {sa_family=AF_LOCAL, sun_path=@"/tmp/.X11-unix/X0"}, 20) = 0
[snip]
open("/dev/dri/card0", O_RDWR|O_CLOEXEC) = 9
[snip]
ioctl(9, 0xc010640b, 0x7fffeb471ea0)    = 0
ioctl(9, 0xc00c6469, 0x7fffeb471ec0)    = 0
ioctl(9, 0xc020645d, 0x7fffeb471d10)    = 0
ioctl(9, 0xc020645d, 0x7fffeb471b10)    = 0
ioctl(9, 0xc020645e, 0x7fffeb471b20)    = 0
mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0x112992000) =
0x7f921dfe9000
ioctl(9, 0xc020645d, 0x7fffeb471b20)    = 0
ioctl(9, 0xc020645e, 0x7fffeb471b30)    = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0x1129a2000) =
0x7f921dfe8000
ioctl(9, VIDIOC_INT_RESET, 0x24460b0)   = 0
ioctl(9, 0xc020645d, 0x7fffeb471db0)    = 0
Then some more interactions with fd=7 until it gets stuck with:
futex(0x984280, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>

At that point only kill -9 helps.

Do you have anything I should try or any info I should provide?

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