Comment 2 for bug 1425145

StacktraceTop:
 __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7fe37cb866c8 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
 malloc_printerr (ptr=<optimized out>, str=0x7fe37cb827b9 "free(): invalid pointer", action=1) at malloc.c:4996
 _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3840
 php_module_shutdown () at /build/buildd/php5-5.5.9+dfsg/main/main.c:2384
 main (argc=7, argv=0x1898360) at /build/buildd/php5-5.5.9+dfsg/sapi/cli/php_cli.c:1393