[Bug libstdc++/51845] New: [4.6 regression] 23_containers/unordered_multimap/erase/24061-multimap.cc segfault

["krebbel at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51845

             Bug #: 51845
           Summary: [4.6 regression]
                    23_containers/unordered_multimap/erase/24061-multimap.
                    cc segfault
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: krebbel@gcc.gnu.org


The failure has been introduced between revisions r181648 r181683.


gdb --args ./24061-multimap.exe 
GNU gdb (GDB) Fedora (7.2.50.20110206-18.fc13)
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "s390-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from
/build/gcc-head-build/s390-ibm-linux-gnu/libstdc++-v3/testsuite/24061-multimap.exe...done.
(gdb) r
Starting program:
/build/gcc-head-build/s390-ibm-linux-gnu/libstdc++-v3/testsuite/24061-multimap.exe 

Program received signal SIGSEGV, Segmentation fault.
malloc_consolidate (av=0x77e123c8) at malloc.c:5161
5161    malloc.c: No such file or directory.
        in malloc.c
(gdb) bt
#0  malloc_consolidate (av=0x77e123c8) at malloc.c:5161
#1  0x77d0ba7e in _int_free (av=0x77e123c8, p=0x4044d0, have_lock=1) at
malloc.c:5034
#2  0x77d0e4da in _int_realloc (av=0x77e123c8, oldp=0x404420,
oldsize=<optimized out>, nb=<optimized out>)
    at malloc.c:5367
#3  0x77d0e7f4 in __libc_realloc (oldmem=0x404428, bytes=172) at malloc.c:3821
#4  0x77d027d0 in _IO_vasprintf (result_ptr=0x7fffea3c, format=<optimized out>,
args=0x7fffe9b8) at vasprintf.c:86
#5  0x77ce49a4 in ___asprintf (string_ptr=<optimized out>, format=<optimized
out>) at asprintf.c:37
#6  0x77cbbbe8 in __assert_fail (assertion=0x4025d2 "mm1.size() == 0", 
    file=0x4024fc
"/build/gcc-head/libstdc++-v3/testsuite/23_containers/unordered_multimap/erase/24061-multimap.cc",
line=99, function=<optimized out>) at assert.c:63
#7  0x00401ff2 in test01 ()
    at
/build/gcc-head/libstdc++-v3/testsuite/23_containers/unordered_multimap/erase/24061-multimap.cc:99
#8  0x004009fe in main ()
    at
/build/gcc-head/libstdc++-v3/testsuite/23_containers/unordered_multimap/erase/24061-multimap.cc:106