Hi Brian, the following bug was reported against the mesa 7.0.3 package in Debian. The relevant code doesn't seem to have changed in master. Could you take a look?
Thanks, Julien On Tue, Jul 7, 2009 at 17:50:06 +0100, roger wrote: > It appears that mesa 7.0.3, crashes with some application in amd64 mode. > > Weh I traced this into mesa I found the wrapper was only fetching the > dispatch table thru _gl_DispatchTSD - although it had not been setup correctly > - (The magic was 0) . > > I compared this gdb trace to the same application which does not crash on > i386 and found that this _gl_DispatchTSD was also not set up on entry to the > wrapper in i386 mode. > > Comparing the i386 code and the dispatch documentation shows that the > wrapper ought to be testing _glapi_Dispatch for NULL before getting the > dispatch table from the TSD info. > > The attached patch changes the wrapper generator script to create code > which this extra check - and avoids unnecessary calls to pthread_getspecific() > > Obviously this root cause of the segv could be an OpenGL programming > issue but it is confusing that the behaviour changes between architectures. > > > --- a/src/mesa/glapi/gl_x86-64_asm.py 2009-07-06 20:51:52.000000000 +0100 > +++ b/src/mesa/glapi/gl_x86-64_asm.py 2009-07-06 22:17:59.000000000 +0100 > @@ -166,7 +166,11 @@ > print '' > print '\t.p2align\t4,,15' > print '_x86_64_get_dispatch:' > - print '\tmovq\t_gl_DispatchTSD(%rip), %rdi' > + print '\tmovq\t_glapi_Dispatch(%rip), %rax' > + print '\ttestq\t%rax,%rax' > + print '\tje\t1f' > + print '\tret' > + print '1:\tmovq\t_gl_DispatchTSD(%rip), %rdi' > print '\tjmp\tpthread_getspeci...@plt' > print '' > print '#elif defined(THREADS)' > > -- To UNSUBSCRIBE, email to debian-x-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
