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Subject: [Bug sanitizer/55975] asan does not work with 46 bit address space on PowerPC64
Date: Wed, 16 Jan 2013 11:54:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55975

--- Comment #8 from Kostya Serebryany <kcc at gcc dot gnu.org> 2013-01-16 11:54:36 UTC ---
Sounds good for both. 

Andreas, could you please try replacing 
kHighMemEnd = 0x00000fffffffffffUL
with 
kHighMemEnd = 0x00003fffffffffffUL
and see if it helps?