[Bug target/53682] [4.7/4.8 Regression] ICE in cselib_lookup (SEGV) on i586-linux-gnu

[aoliva at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53682

Alexandre Oliva <aoliva at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|NEW                         |ASSIGNED

--- Comment #3 from Alexandre Oliva <aoliva at gcc dot gnu.org> 2012-06-18 10:31:09 UTC ---
Mine.  AFAICT the problem is that promote_debug_loc crashes when the loc list
for a VALUE is temporarily cleared within alias.c to avoid infinite recursion. 
Getting it to return if passed a NULL pointer seems to be the correct fix. 
AFAICT we won't run into this except within var-tracking.