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Date: Sun, 26 Jun 2011 23:47:13 +0900 From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> To: Steven Rostedt <rostedt@...dmis.org>, Jim Keniston <jkenisto@...ux.vnet.ibm.com>, Ananth N Mavinakayanahalli <ananth@...ibm.com> Cc: Yong Zhang <yong.zhang0@...il.com>, linuxppc-dev@...ts.ozlabs.org, linux-kernel <linux-kernel@...r.kernel.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, paulus@...ba.org, galak@...nel.crashing.org, yrl.pp-manager.tt@...achi.com Subject: Re: [BUG?]3.0-rc4+ftrace+kprobe: set kprobe at instruction 'stwu' lead to system crash/freeze (2011/06/24 19:29), Steven Rostedt wrote: > On Fri, 2011-06-24 at 17:21 +0800, Yong Zhang wrote: >> 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 not sure if x86 had a similar issue. > > Masami, have any ideas to why this happened? No, I don't familiar with ppc implementation. I guess that single-step resume code failed to emulate the instruction, but it strongly depends on ppc arch. Maybe IBM people may know what happened. Ananth, Jim, would you have any ideas? Thank you, > > I don't have a PPC32 to test on, but I can try it out on my PPC64. > > -- Steve > >> >> 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 >> -- Masami HIRAMATSU Software Platform Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@...achi.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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