Created attachment 39273 [details] [review]
Prevents the crash in wincopy when pressing f
Run wincopy and press the f key to go to front buffer
wincopy will crash, running gdb shows this..
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Reading symbols from /home/kdekorte/git/mesa/progs/xdemos/wincopy...done.
Starting program: /home/kdekorte/git/mesa/progs/xdemos/wincopy
[Thread debugging using libthread_db enabled]
Press Esc to exit
Press 'f' to toggle front/back buffer drawing
Drawing to GL_FRONT buffer
Program received signal SIGSEGV, Segmentation fault.
st_Clear (ctx=0xb34a40, mask=1) at state_tracker/st_cb_clear.c:479
479 if (!strb->surface)
Missing separate debuginfos, use: debuginfo-install expat-2.0.1-10.fc13.x86_64 glibc-2.12.1-2.x86_64 libX11-1.3.1-3.fc13.x86_64 libXau-1.0.5-1.fc12.x86_64 libXdamage-1.1.2-2.fc13.x86_64 libXext-1.1.2-2.fc13.x86_64 libXfixes-4.0.4-2.fc13.x86_64 libXxf86vm-1.1.0-1.fc13.x86_64 libdrm-2.4.22-1.fc13.x86_64 libgcc-4.4.4-10.fc13.x86_64 libstdc++-4.4.4-10.fc13.x86_64 libtalloc-2.0.1-1.fc13.x86_64 libv4l-0.8.1-1.fc13.x86_64 libxcb-1.5-1.fc13.x86_64
#0 st_Clear (ctx=0xb34a40, mask=1) at state_tracker/st_cb_clear.c:479
#1 0x00000000004013f7 in Redraw () at wincopy.c:156
#2 0x0000000000401605 in EventLoop () at wincopy.c:232
#3 0x0000000000401987 in main (argc=<value optimized out>,
argv=<value optimized out>) at wincopy.c:312
(gdb) print strb
$1 = (struct st_renderbuffer *) 0x0
Patch to correct is attached
Tested with r600g, color tiling is off and application is xdemos/wincopy
Pressing F still crashes git c3ed27ec76c5456412122d7e654a2e298409cc88
bug still present in git fa62cf7450595b3d99259b5a212df301ca711d4b
and patch still seems to correct it.
Looks like a core mesa issue.
Alex, are you sure this is core mesa issue as the code does not crash on my intel based machine.
(In reply to comment #5)
> Alex, are you sure this is core mesa issue as the code does not crash on my
> intel based machine.
It looks like a gallium state tracker bug. The Intel drivers don't use gallium.
mesa: aedbf05d31c1a8d7d3c2742524abf2db2422b2fe (master)
swrast - ok
softpipe - crash
llvmpipe - crash
Fixed with commit efbd33aff93d875af95d40db018b7911a3f87d02
on Dec 09, 2016 at 03:48:32.
(provided by the Example extension).