[Mesa-dev] [Bug 30694] New: wincopy will crash on r600g when going to front buffer

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=30694

           Summary: wincopy will crash on r600g when going to front buffer
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
        AssignedTo: mesa-dev at lists.freedesktop.org
        ReportedBy: kdekorte at yahoo.com


Created an attachment (id=39273)
 View: https://bugs.freedesktop.org/attachment.cgi?id=39273
 Review: https://bugs.freedesktop.org/review?bug=30694&attachment=39273

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..

gdb ./wincopy 
GNU gdb (GDB) Fedora (7.1-34.fc13)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/kdekorte/git/mesa/progs/xdemos/wincopy...done.
(gdb) run
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
(gdb) bt
#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
(gdb) quit


Patch to correct is attached

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