[Bug middle-end/38814] New: valgrind returns Invalid write in reserve_phi_args_for_new_edge

["jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>]

version used for testing:

GNU Fortran (GCC) version 4.4.0 20090112 (experimental) [trunk revision 143288]
(x86_64-unknown-linux-gnu)
        compiled by GNU C version 4.4.0 20090112 (experimental) [trunk revision
143288], GMP version 4.2.2, MPFR version 2.3.1.


valgrind --tool=memcheck
/data03/vondele/gcc_trunk/build/libexec/gcc/x86_64-unknown-linux-gnu/4.4.0/f951
all.f90 -march=k8-sse3 -mcx16 -msahf --param l1-cache-size=64 --param
l1-cache-line-size=64 --param l2-cache-size=1024 -mtune=k8 -quiet -dumpbase
all.f90 -auxbase all -O3 -version -ffast-math -ftree-vectorize -ffree-form
-fintrinsic-modules-path
/data03/vondele/gcc_trunk/build/lib/gcc/x86_64-unknown-linux-gnu/4.4.0/finclude
-o /tmp/ccIEjF0W.s

==22900==
==22900== Invalid write of size 8
==22900==    at 0x7A028D: reserve_phi_args_for_new_edge
(tree-flow-inline.h:299)
==22900==    by 0xAE0332: redirect_edge_succ_nodup (cfg.c:410)
==22900==    by 0x751AC0: gimple_redirect_edge_and_branch (tree-cfg.c:4801)
==22900==    by 0xAF0479: redirect_edge_and_branch (cfghooks.c:323)
==22900==    by 0x75CFBC: cleanup_tree_cfg_bb (tree-cfgcleanup.c:413)
==22900==    by 0x75D71C: cleanup_tree_cfg (tree-cfgcleanup.c:594)
==22900==    by 0x69EE44: execute_function_todo (passes.c:923)
==22900==    by 0x69F06E: execute_todo (passes.c:1025)
==22900==    by 0x69F384: execute_one_pass (passes.c:1302)
==22900==    by 0x69F574: execute_pass_list (passes.c:1328)
==22900==    by 0x69F58C: execute_pass_list (passes.c:1329)
==22900==    by 0x69F58C: execute_pass_list (passes.c:1329)
==22900==  Address 0x200000008 is not stack'd, malloc'd or (recently) free'd
all.f90: In function ?build_se_core_matrix?:
all.f90:364860: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

the testcase is all.f90 in
http://www.pci.unizh.ch/vandevondele/tmp/CP2K_gcc_2007_06.tgz (see also comment
#112 in PR29975). 

which unfortunately means it takes a couple of hours to reproduce through
valgrind. I started the valgrinded compilation after having a segfault with a
normal compilation that I couldn't reproduce in gdb. The latter really is a bit
strange, just testing it again, segfaults out of gdb, doesn't segfault within
gdb..


-- 
           Summary: valgrind returns Invalid write in
                    reserve_phi_args_for_new_edge
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jv244 at cam dot ac dot uk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38814