Bug 17440

I'm experiencing a lot of segfaults with recent mesa trunk, which were not there one month ago. This is on i945 hardware. Only mesa is git, the server and drm are purposely old ones: server 1.4.2 with intel driver 2.3.2, and kernel 2.6.26.

This is a trace I caught with valgrind:

Conditional jump or move depends on uninitialised value(s)
   at 0x7C5E6FF: _mesa_reference_buffer_object (bufferobj.c:187)
   by 0x7D7D686: _mesa_PushClientAttrib (attrib.c:1334)
   by 0x50BF322: glutBitmapCharacter (in /usr/lib/libglut.so.3.8.0)
   by 0x402319: printstring (terrain.c:215)
   by 0x402E8B: drawscene (terrain.c:407)
   by 0x50C5B12: glutMainLoop (in /usr/lib/libglut.so.3.8.0)
   by 0x402536: main (terrain.c:653)

Conditional jump or move depends on uninitialised value(s)
   at 0x7C5E704: _mesa_reference_buffer_object (bufferobj.c:190)
   by 0x7D7D686: _mesa_PushClientAttrib (attrib.c:1334)
   by 0x50BF322: glutBitmapCharacter (in /usr/lib/libglut.so.3.8.0)
   by 0x402319: printstring (terrain.c:215)
   by 0x402E8B: drawscene (terrain.c:407)
   by 0x50C5B12: glutMainLoop (in /usr/lib/libglut.so.3.8.0)
   by 0x402536: main (terrain.c:653)

Use of uninitialised value of size 8
   at 0x7C5E706: _mesa_reference_buffer_object (bufferobj.c:197)
   by 0x7D7D686: _mesa_PushClientAttrib (attrib.c:1334)
   by 0x50BF322: glutBitmapCharacter (in /usr/lib/libglut.so.3.8.0)
   by 0x402319: printstring (terrain.c:215)
   by 0x402E8B: drawscene (terrain.c:407)
   by 0x50C5B12: glutMainLoop (in /usr/lib/libglut.so.3.8.0)
   by 0x402536: main (terrain.c:653)

Invalid read of size 4
   at 0x7C5E706: _mesa_reference_buffer_object (bufferobj.c:197)
   by 0x7D7D686: _mesa_PushClientAttrib (attrib.c:1334)
   by 0x50BF322: glutBitmapCharacter (in /usr/lib/libglut.so.3.8.0)
   by 0x402319: printstring (terrain.c:215)
   by 0x402E8B: drawscene (terrain.c:407)
   by 0x50C5B12: glutMainLoop (in /usr/lib/libglut.so.3.8.0)
   by 0x402536: main (terrain.c:653)
 Address 0x10d is not stack'd, malloc'd or (recently) free'd

Process terminating with default action of signal 11 (SIGSEGV)
 Access not within mapped region at address 0x10D
   at 0x7C5E706: _mesa_reference_buffer_object (bufferobj.c:197)
   by 0x7D7D686: _mesa_PushClientAttrib (attrib.c:1334)
   by 0x50BF322: glutBitmapCharacter (in /usr/lib/libglut.so.3.8.0)
   by 0x402319: printstring (terrain.c:215)
   by 0x402E8B: drawscene (terrain.c:407)
   by 0x50C5B12: glutMainLoop (in /usr/lib/libglut.so.3.8.0)
   by 0x402536: main (terrain.c:653)

I intend to take an in-depth look in the next few days. But since almost half of the application runs are crashing, I thought I would mention it as soon as possible.