[Bug middle-end/44817] New: Stage2/stage3 genautomata has invalid memory access

["hjl dot tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

On Linux/x86-64, revision 161806 gave:

# /usr/bin/valgrind --tool=memcheck build/genautomata
/export/gnu/import/svn/gcc-test/src-trunk/gcc/config/i386/i386.md
insn-conditions.md > /dev/null
==5903== Memcheck, a memory error detector
==5903== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
==5903== Using Valgrind-3.5.0 and LibVEX; rerun with -h for copyright info
==5903== Command: build/genautomata
/export/gnu/import/svn/gcc-test/src-trunk/gcc/config/i386/i386.md
insn-conditions.md
==5903== 
==5903== Invalid read of size 8
==5903==    at 0x401BE7: check_absence_pattern_sets (genautomata.c:4353)
==5903==    by 0x40D85F: create_automata (genautomata.c:3503)
==5903==    by 0x4101D5: expand_automata (genautomata.c:9093)
==5903==    by 0x4115B8: main (genautomata.c:9543)
==5903==  Address 0x1c is not stack'd, malloc'd or (recently) free'd
==5903== 
==5903== 
==5903== Process terminating with default action of signal 11 (SIGSEGV)
==5903==  Access not within mapped region at address 0x1C
==5903==    at 0x401BE7: check_absence_pattern_sets (genautomata.c:4353)
==5903==    by 0x40D85F: create_automata (genautomata.c:3503)
==5903==    by 0x4101D5: expand_automata (genautomata.c:9093)
==5903==    by 0x4115B8: main (genautomata.c:9543)
==5903==  If you believe this happened as a result of a stack
==5903==  overflow in your program's main thread (unlikely but
==5903==  possible), you can try to increase the size of the
==5903==  main thread stack using the --main-stacksize= flag.
==5903==  The main thread stack size used in this run was 8388608.
==5903== 
==5903== HEAP SUMMARY:
==5903==     in use at exit: 11,187,082 bytes in 73,185 blocks
==5903==   total heap usage: 83,419 allocs, 10,234 frees, 32,694,074 bytes
allocated
==5903==


-- 
           Summary: Stage2/stage3 genautomata has invalid memory access
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl dot tools at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44817