https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77879
Bug ID: 77879
Summary: [7 Regression] mpd gets miscompiled since r235622
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: trippels at gcc dot gnu.org
Target Milestone: ---
Created attachment 39759
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39759&action=edit
unreduced testcase
Since r235622:
commit 73447cc5d17178b0a756be48133e55fdc7574c13
Author: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri Apr 29 08:36:49 2016 +0000
2016-04-29 Richard Biener <rguent...@suse.de>
PR tree-optimization/13962
PR tree-optimization/65686
* tree-ssa-alias.h (ptrs_compare_unequal): Declare.
* tree-ssa-alias.c (ptrs_compare_unequal): New function
using PTA to compare pointers.
* match.pd: Add pattern for pointer equality compare simplification
using ptrs_compare_unequal.
mpd (https://www.musicpd.org/) gets miscompiled and crashes on startup:
*** Error in `mpd': free(): invalid pointer: 0x00007fffffffe310 ***
...
Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
58 }
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
#1 0x00007ffff55bed1b in __GI_abort () at abort.c:89
#2 0x00007ffff56028b3 in __libc_message (do_abort=do_abort@entry=2,
fmt=fmt@entry=0x7ffff56ed130 "*** Error in `%s': %s: 0x%s ***\n") at
../sysdeps/posix/libc_fatal.c:175
#3 0x00007ffff560d141 in malloc_printerr (ar_ptr=<optimized out>,
ptr=<optimized out>, str=0x7ffff56ea76a "free(): invalid pointer",
action=<optimized out>) at malloc.c:4983
#4 _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at
malloc.c:3839
#5 0x00007ffff5612e5e in __GI___libc_free (mem=<optimized out>) at
malloc.c:2919
#6 0x000000000042b833 in parse_cmdline (argc=argc@entry=1,
argv=argv@entry=0x7fffffffe6d8, options=options@entry=0x7fffffffe530,
error=...) at src/CommandLine.cxx:342
#7 0x000000000040dde2 in mpd_main (argc=1, argv=0x7fffffffe6d8) at
src/Main.cxx:466
#8 0x00007ffff55a7271 in __libc_start_main (main=0x40d940 <main(int, char**)>,
argc=1, argv=0x7fffffffe6d8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fffffffe6c8) at
../csu/libc-start.c:286
#9 0x000000000040dc0a in _start () at ../sysdeps/x86_64/start.S:120
...
(gdb) up
#6 0x000000000042b833 in parse_cmdline (argc=argc@entry=1,
argv=argv@entry=0x7fffffffe6d8, options=options@entry=0x7fffffffe530,
error=...) at src/CommandLine.cxx:342
342 loader.TryFile(GetUserConfigDir(),
(gdb) p GetUserConfigDir()
$1 = {
value = "\001\000\000\000\000\000\000\000\355A\000\000"
}
without r235622 it returns the correct string:
(gdb) p GetUserConfigDir()
$1 = {
value = "/root/.config"
}
An unreduced testcase is attached.
