[Mesa-dev] Hang in dri3_wait_for_event

[Martin Peres]

On 08/01/16 18:37, Gustaw Smolarczyk wrote:
> Hello,
>
> There are already quite a few bug reports[1][2][3] related to thread
> hang when DRI3 is enabled. The problem still exists, at least for me.
> Should I create another bug report about it? Or maybe the cause of
> this hang is outside mesa?

I do not think you should, there are enough bug reports already for what 
can likely be attributed to the same issue.

>
> I use xserver 1.18, xf86-video-ati git, libdrm git, mesa git
> (radeonsi), kernel 4.3.3. An example stack trace (from chrome gpu
> process):

What version of libxcb are you using. The patch for this particular bug 
should be sufficient. There is still another bug that I need to hunt 
down [1] which for some reason only manifests itself at home but not at 
work. Maybe I can try to fix that over the week end, since it is so cold 
outside :p

[1] https://bugs.freedesktop.org/show_bug.cgi?id=84252#c30


>
> (gdb) bt
> #0  0x00007f3c19b3664d in poll () at ../sysdeps/unix/syscall-template.S:84
> #1  0x00007f3c18b1ba22 in ?? () from /usr/lib64/libxcb.so.1
> #2  0x00007f3c18b1d669 in xcb_wait_for_special_event () from
> /usr/lib64/libxcb.so.1
> #3  0x00007f3c186b0adb in dri3_wait_for_event
> (draw=draw at entry=0x37742d8e64b8) at
> /var/tmp/portage/media-libs/mesa-9999/work/mesa-9999/src/loader/loader_dri3_helper.c:280
> #4  0x00007f3c186b0e48 in loader_dri3_wait_for_msc
> (draw=0x37742d8e64b8, target_msc=target_msc at entry=0,
> divisor=divisor at entry=0, remainder=remainder at entry=0,
> ust=0x7fff850f66b8, msc=0x7fff850f66b0, sbc=0x7fff850f66a8)
>     at /var/tmp/portage/media-libs/mesa-9999/work/mesa-9999/src/loader/loader_dri3_helper.c:314
> #5  0x00007f3c186abfbb in dri3_wait_for_msc (sbc=<optimized out>,
> msc=<optimized out>, ust=<optimized out>, remainder=0, divisor=0,
> target_msc=0, pdraw=<optimized out>)
>     at /var/tmp/portage/media-libs/mesa-9999/work/mesa-9999/src/glx/dri3_glx.c:389
> #6  dri3_drawable_get_msc (psc=<optimized out>, pdraw=<optimized out>,
> ust=<optimized out>, msc=<optimized out>, sbc=<optimized out>) at
> /var/tmp/portage/media-libs/mesa-9999/work/mesa-9999/src/glx/dri3_glx.c:404
> #7  0x00005654e934ef2a in ?? ()
> #8  0x0000000000000000 in ?? ()
>
> Regards,
> Gustaw Smolarczyk
>
> [1] https://bugs.freedesktop.org/show_bug.cgi?id=84252
> [2] https://bugs.freedesktop.org/show_bug.cgi?id=81623
> [3] https://bugs.freedesktop.org/show_bug.cgi?id=90202
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