profiling broken on RELENG_7/i386

Dmitry Morozovsky marck at rinet.ru
Fri Jul 4 09:26:59 UTC 2008


On Fri, 4 Jul 2008, Dmitry Morozovsky wrote:

DM> It seems we step on a bug in gcc in RELENG_7/i386
DM> 
DM> It is triggered at least by profiling program which uses getopt(3):

[snip]

DM> other ref platforms seem to be ok. 

Nah, HEAD/i386 also has this bug, though backtrace is a bit different:

marck at ref8-i386:~/tmp/gprof> make clean all
rm -f test test.o
Warning: Object directory not changed from original 
/dumpster/home/marck/tmp/gprof
cc -O2 -pipe -march=prescott -g -pg -fstack-protector  -c test.c
cc -O2 -pipe -march=prescott -g -pg -fstack-protector   -o test test.o
marck at ref8-i386:~/tmp/gprof> ./test
Segmentation fault (core dumped)
marck at ref8-i386:~/tmp/gprof> gdb test test.core
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd"...
Core was generated by `test'.
Program terminated with signal 11, Segmentation fault.
#0  0x08048242 in getopt ()
(gdb) bt
#0  0x08048242 in getopt ()
#1  0x080481f9 in main (argc=0, argv=0x0) at test.c:9
(gdb) l
9               while ((ch = getopt(argc, argv, "")) != -1) {
10              }
11
12              return (0);
13      }
(gdb) marck at ref8-i386:~/tmp/gprof> truss ./test
__sysctl(0xbf7fe728,0x2,0x8071ff0,0xbf7fe730,0x0,0x0) = 0 (0x0)
__sysctl(0xbf7fe67c,0x2,0x80776a8,0xbf7fe684,0x0,0x0) = 0 (0x0)
__sysctl(0xbf7fe6cc,0x2,0xbf7fe6d8,0xbf7fe6dc,0x0,0x0) = 0 (0x0)
readlink("/etc/malloc.conf","DMaj",1024)         = 4 (0x4)
issetugid(0x806c233,0xbf7fe737,0x400,0xbf7fe730,0x0,0x0) = 0 (0x0)
break(0x8100000)                                 = 0 (0x0)
break(0x8200000)                                 = 0 (0x0)
sysarch(0xa,0xbf7feba0,0xbf7febc8,0x8048555,0x8102040,0xc) = 0 (0x0)
break(0x822c69c)                                 = 0 (0x0)
profil(0x8208988,0x11e8a,0x8048148,0x8000,0x0,0x0) = 0 (0x0)
__sysctl(0xbf7feb9c,0x2,0x8072140,0xbf7feba4,0x0,0x0) = 0 (0x0)
SIGNAL 11 (SIGSEGV)



amd64 and RELENG_6 seem to perform well


Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck at FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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