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Subject: [Bug tree-optimization/52307] New: Segmentation fault in Lapack with -O3 -floop-flatten -floop-strip-mine
Date: Sun, 19 Feb 2012 01:57:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52307

             Bug #: 52307
           Summary: Segmentation fault in Lapack with -O3 -floop-flatten
                    -floop-strip-mine
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: tkoenig@gcc.gnu.org
                CC: rguenth@gcc.gnu.org


Running the Lapack tests (and looking at PR 50561), I encountered this:

 All tests for SPP drivers  passed the threshold (   1910 tests run)

 SPB routines passed the tests of the error exits

Program received signal 11 (SIGSEGV): Segmentation fault.

Backtrace for this error:
  + [0xfff8e340418]
  + function 0000009f.plt_call.cosf@@GLIBC_2.3+0 (0x100B6FDC)
    from file crtstuff.c

tkoenig@gcc1-power7 TESTING]$ ~/bin/gfortran -v
Using built-in specs.
COLLECT_GCC=/home/tkoenig/bin/gfortran
COLLECT_LTO_WRAPPER=/home/tkoenig/libexec/gcc/powerpc64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: powerpc64-unknown-linux-gnu
Configured with: ../trunk/configure --prefix=/home/tkoenig
--enable-languages=c,fortran --with-ppl --with-cloog
Thread model: posix
gcc version 4.7.0 20120218 (experimental) [trunk revision 184372] (GCC)
[tkoenig@gcc1-power7 TESTING]$

This is after the fix for PR 50561, and may be related.

I haven't yet checked if this is a regression.