Comment # 5
on bug 82828
from Pavel Ondračka
Created attachment 105451 [details] full backtrace from piglit crash (In reply to comment #4) > All the crashes are in the same place, right? > > Can you run it under gdb and print out n2 and the contents of > g->nodes[n].adjacency_list (it's an array with g->nodes[n].adjacency_count > elements) after the segfault? How about the former before the ra_simplify() > call in the ra_allocate() call that's segfaulting? (If you don't know how to > do this, see > http://stackoverflow.com/questions/2956889/how-to-set-a-counter-for-a-gdb- > breakpoint) > > I'm guessing that it's segfaulting because n2 is some bogus value. n2 comes > from the adjacency_list, which is something generated before the allocator > actually runs by code I didn't touch and then never modified afterward, and > the code that's segfaulting wasn't modified by the commit in question, so > the two most likely options I see are that either this is exposing a bug > somewhere else (like in r300g) or the new ra_simplify() is somehow > corrupting the adjacency_list. I don't know how r300g sets up the register > conflicts and register classes, though, so I can't guess why it works fine > on i965 but fails for r300g. OK, so not sure if I know what I'm doing but selecting one random crashing piglit test /bin/shader_runner tests/shaders/glsl-fs-loop-continue.shader_test -auto Program received signal SIGSEGV, Segmentation fault. 0xb76391a9 in ra_select (g=0x80c2058) at ../../src/mesa/program/register_allocate.c:525 525 BITSET_TEST(g->regs->regs[r].conflicts, g->nodes[n2].reg)) { print n2 $2 = 0 print n $7 = 1 print g->nodes[n].adjacency_count $1 = 3 print g->nodes[n].adjacency_list $3 = (unsigned int *) 0x80c1b58 print g->nodes[n].adjacency_list[0] $4 = 1 print g->nodes[n].adjacency_list[1] $5 = 0 print g->nodes[n].adjacency_list[2] $6 = 2 full backtrace attached.
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