[BUG?]3.0-rc4+ftrace+kprobe: set kprobe at instruction 'stwu' lead to system crash/freeze

[Yong Zhang]

Hi,

When I use kprobe to do something, I found some wired thing.

When CONFIG_FUNCTION_TRACER is disabled:
(gdb) disassemble do_fork
Dump of assembler code for function do_fork:
   0xc0037390 <+0>:	mflr    r0
   0xc0037394 <+4>:	stwu    r1,-64(r1)
   0xc0037398 <+8>:	mfcr    r12
   0xc003739c <+12>:	stmw    r27,44(r1)

Then I:
modprobe kprobe_example func=do_fork offset=4
ls
Things works well.

But when CONFIG_FUNCTION_TRACER is enabled:
(gdb) disassemble do_fork
Dump of assembler code for function do_fork:
   0xc0040334 <+0>:	mflr    r0
   0xc0040338 <+4>:	stw     r0,4(r1)
   0xc004033c <+8>:	bl      0xc00109d4 <mcount>
   0xc0040340 <+12>:	stwu    r1,-80(r1)
   0xc0040344 <+16>:	mflr    r0
   0xc0040348 <+20>:	stw     r0,84(r1)
   0xc004034c <+24>:	mfcr    r12
Then I:
modprobe kprobe_example func=do_fork offset=12
ls
'ls' will never retrun. system freeze.

I'm using toolchain from:http://www.denx.de/wiki/ELDK-5/WebHome
powerpc-linux-gcc -v
Using built-in specs.
COLLECT_GCC=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/bin/powerpc-linux/powerpc-linux-gcc
COLLECT_LTO_WRAPPER=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/libexec/powerpc-linux/gcc/powerpc-linux/4.5.1/lto-wrapper
Target: powerpc-linux
Configured with:
/opt/poky/build/eldk-2011-05-20-5cde06e-powerpc/tmp/work/i686-nativesdk-oesdk-linux/gcc-cross-canadian-powerpc-4.5.1-r4/gcc-4.5.1/configure
--build=x86_64-linux --host=i686-oesdk-linux --target=powerpc-linux
--prefix=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr
--exec_prefix=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr
--bindir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/bin/powerpc-linux
--sbindir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/bin/powerpc-linux
--libexecdir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/libexec/powerpc-linux
--datadir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/share
--sysconfdir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/etc
--sharedstatedir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/com
--localstatedir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/var
--libdir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/lib/powerpc-linux
--includedir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/include
--oldincludedir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/include
--infodir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/share/info
--mandir=/opt/eldk-5.0/powerpc/sysroots/i686-oesdk-linux/usr/share/man
--with-libtool-sysroot=/opt/poky/build/eldk-2011-05-20-5cde06e-powerpc/tmp/sysroots/i686-oesdk-linux-nativesdk
--with-gnu-ld --enable-shared --enable-languages=c,c++
--enable-threads=posix --disable-multilib --enable-c99
--enable-long-long --enable-symvers=gnu --enable-libstdcxx-pch
--program-prefix=powerpc-linux- --enable-lto --enable-libssp
--disable-bootstrap --disable-libgomp --disable-libmudflap
--enable-cheaders=c_global
--with-local-prefix=/opt/eldk-5.0/powerpc/sysroots/powerpc-linux/usr
--with-gxx-include-dir=/usr/include/c++
--with-build-time-tools=/opt/poky/build/eldk-2011-05-20-5cde06e-powerpc/tmp/sysroots/x86_64-linux/usr/powerpc-linux/bin
--with-sysroot=/opt/eldk-5.0/powerpc/sysroots/powerpc-linux
--with-build-sysroot=/opt/poky/build/eldk-2011-05-20-5cde06e-powerpc/tmp/sysroots/powerpc
--disable-libunwind-exceptions --disable-libssp --disable-libgomp
--disable-libmudflap
--with-mpfr=/opt/poky/build/eldk-2011-05-20-5cde06e-powerpc/tmp/sysroots/i686-oesdk-linux-nativesdk
--with-mpc=/opt/poky/build/eldk-2011-05-20-5cde06e-powerpc/tmp/sysroots/i686-oesdk-linux-nativesdk
--enable-__cxa_atexit
Thread model: posix
gcc version 4.5.1 (GCC)


And kernel config is attached.

BTW, I have made a patch to make kprobe_example set breakpoint easily,
attached too.

Thanks,
Yong

-- 
Only stand for myself
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