profiling broken on RELENG_7/i386

Dmitry Morozovsky marck at
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> It is triggered at least by profiling program which uses getopt(3):


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 
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]
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welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
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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              }
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)

amd64 and RELENG_6 seem to perform well

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

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