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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/61145] New: valgrind finds problems in ipa_analyze_node
Date: Sun, 11 May 2014 13:39:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61145

            Bug ID: 61145
           Summary: valgrind finds problems in ipa_analyze_node
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com

I just tried to use today's (20140511) bootstrap trunk code
to compile the gcc/testsuite/gcc.c-torture/compile/limits-fndefn.c
with compiler flag -O2.

valgrind says

==13219== Invalid write of size 8
==13219==    at 0x7E308A: ipa_analyze_node(cgraph_node*) (ipa-prop.c:2245)
==13219==    by 0xE5540F: ipcp_generate_summary() (ipa-cp.c:3745)
==13219==    by 0x8ACF83: execute_ipa_summary_passes(ipa_opt_pass_d*)
(passes.c:1974)
==13219==    by 0x647E86: compile() [clone .part.29] (cgraphunit.c:2070)
==13219==    by 0x6483AD: finalize_compilation_unit() (cgraphunit.c:2151)
==13219==    by 0x531B7B: c_write_global_declarations() (c-decl.c:10428)
==13219==    by 0x983E5C: compile_file() (toplev.c:562)
==13219==    by 0x985AA1: toplev_main(int, char**) (toplev.c:1915)
==13219==    by 0x32C5E21D64: (below main) (libc-start.c:285)
==13219==  Address 0xffedb5728 is on thread 1's stack
==13219==

Source code in compiler is

  param_count = ipa_get_param_count (info);
  parms_ainfo = XALLOCAVEC (struct param_analysis_info, param_count);
  memset (parms_ainfo, 0, sizeof (struct param_analysis_info) * param_count);