Date: Sun, 21 Aug 2011 13:08:25 +0400 From: Test Rat <ttsestt@gmail.com> To: freebsd-toolchain@freebsd.org Subject: [clang] rtld-elf/rtld.c and stack traces in gdb(1) Message-ID: <86fwkvt9me.fsf@gmail.com>
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I often get corrupted traces with clang world, the cause seems to be in rtld.
$ cd /usr/src/libexec/rtld-elf; env -i __MAKE_CONF=/dev/null TERM=$TERM sh
$ make CC=gcc all install
$ gdb yes
[...]
y
y
^C
Program received signal SIGINT, Interrupt.
0x00000008009455ac in write () from /lib/libc.so.7
(gdb) bt
#0 0x00000008009455ac in write () from /lib/libc.so.7
#1 0x0000000800944fa7 in _swrite (fp=<value optimized out>, buf=<value optimized out>, n=<value optimized out>)
at /usr/src/lib/libc/stdio/stdio.c:133
#2 0x0000000800944c7b in __fflush (fp=<value optimized out>) at /usr/src/lib/libc/stdio/fflush.c:123
#3 0x000000080094412d in __sfvwrite (fp=<value optimized out>, uio=<value optimized out>)
at /usr/src/lib/libc/stdio/fvwrite.c:194
#4 0x000000080091c434 in puts (s=<value optimized out>) at /usr/src/lib/libc/stdio/puts.c:68
#5 0x00000000004005fa in main (argc=<value optimized out>, argv=find_location_expression: Corrupted DWARF expression.
) at /usr/src/usr.bin/yes/yes.c:54
$ touch rtld.c
$ PATH=/usr/bin:$PATH make CC=clang all install
$ gdb yes
[...]
y
y
^C
Program received signal SIGINT, Interrupt.
0x00000008009455ac in ?? ()
(gdb) bt
#0 0x00000008009455ac in ?? ()
#1 0x0000000800944fa7 in ?? ()
#2 0x0000000000000002 in ?? ()
#3 0x000000080094d560 in ?? ()
#4 0x0000000800b73560 in ?? ()
#5 0x0000000800c08000 in ?? ()
#6 0x00007fffffffd160 in ?? ()
#7 0x0000000800944c7b in ?? ()
#8 0x0000000000000001 in ?? ()
#9 0x0000000000000001 in ?? ()
#10 0x0000000000000001 in ?? ()
#11 0x0000000800b73560 in ?? ()
#12 0x00007fffffffd1c0 in ?? ()
#13 0x000000080094412d in ?? ()
#14 0x00007fffffffc648 in ?? ()
#15 0x0000000000000001 in ?? ()
#16 0x0000000100400656 in ?? ()
#17 0x00007fffffffd1f8 in ?? ()
#18 0x00007fffffffd1f8 in ?? ()
#19 0x0000000000400656 in _fini ()
#20 0x00007fffffffd280 in ?? ()
#21 0x0000000000000000 in ?? ()
And compiling rtld with clang + -O0 makes it crash.
--
FreeBSD 9.0-BETA1 r225055M amd64
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