http://bugs.freedesktop.org/show_bug.cgi?id=15834
Summary: Current Amira version 4.1.1 causes X to crash in
_tnl_InvalidateState
Product: Mesa
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: high
Component: Mesa core
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
When running Amira under current git version of X and current git version of
mesa, dri and so on, Amira crashes the whole session.
(gdb)
Program received signal SIGSEGV, Segmentation fault.
0xaf814ea2 in _tnl_InvalidateState (ctx=0x9074e98, new_state=525315) at
tnl/t_context.c:140
140 if (ctx->Fog.Enabled ||
(gdb) bt
#0 0xaf814ea2 in _tnl_InvalidateState (ctx=0x9074e98, new_state=525315) at
tnl/t_context.c:140
#1 0xaf767ef0 in intelInvalidateState (ctx=0x9074e98, new_state=525315) at
intel_context.c:340
#2 0xaf7da923 in _mesa_update_state_locked (ctx=0x9074e98) at
main/state.c:1253
#3 0xaf7dac2a in _mesa_update_state (ctx=0x9074e98) at main/state.c:1264
#4 0xaf80aeb8 in vbo_exec_Begin (mode=4) at vbo/vbo_exec_api.c:509
#5 0xb7b66315 in __glXDisp_Begin (pc=0x93bd7e4 "\004") at
indirect_dispatch.c:156
#6 0xb7b495ee in __glXDisp_Render (cl=0x86205a4, pc=0x93bd7e0 "\b") at
glxcmds.c:1788
#7 0xb7b4d966 in __glXDispatch (client=0x86204e0) at glxext.c:492
#8 0x0808abfc in Dispatch () at dispatch.c:451
#9 0x080716ea in main (argc=8, argv=0xbfa4a9b4, envp=0x909f870) at main.c:433
This is the location within _tnl_InvalidateState
140 if (ctx->Fog.Enabled ||
141 ((ctx->FragmentProgram._Active || ctx->FragmentProgram._Current)
&&
142 (ctx->FragmentProgram._Current->FogOption != GL_NONE ||
143 (ctx->FragmentProgram._Current->Base.InputsRead &
FRAG_BIT_FOGC))))
144 RENDERINPUTS_SET( tnl->render_inputs_bitset, _TNL_ATTRIB_FOG );
The problem is here, that for whatever reason, ctx->FragmentProgram._Active
happens to be nonzero, whereas ctx->FragmentProgram._Current actually is zero.
Therefore dereferencing ctx->FragmentProgam._Current will signal.
Fix would be simple. Change that "||" to "&&".
(BTW: Wouldn't you like to change the "CVS" tag to "git" in this form?)
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