[Bug 105497] shader-db crashes on 72 core system after ast_type_qualifier bitset change

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Mar 15 23:44:11 UTC 2018


--- Comment #2 from Francisco Jerez <currojerez at riseup.net> ---
Thanks for letting me reproduce this on ogopogo.  It seems to be crashing at
this instruction:

   0x00007ffff41106d9 <+169>:   movaps %xmm0,-0x130(%rbp)
=> 0x00007ffff41106e0 <+176>:   pand   (%rbx),%xmm0
   0x00007ffff41106e4 <+180>:   movaps %xmm0,-0x120(%rbp)

GCC 5.4 seems to be vectorizing the 128-bit bitmask operation, but the memory
address of "this" is not 128-bit aligned (it's 0x7fffe8bff728 during this run),
which causes the crash.  Probably a GCC bug...

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