On Thu, May 18, 2023 at 3:16 PM Mathieu Desnoyers <mathieu.desnoy...@efficios.com> wrote: > > On 2023-05-18 15:07, Brian Hutchinson wrote: > > [...] > > >> > >> If you attach to an ELF symbol (function), then there is no USDT in > >> play, so it should not be related to the issue you have. > > > > That is what I was thinking which is why I wanted to try it. > > > >> > >> But if your functions happen to be inlined, then there will be nothing > >> to attach to. Perhaps this is what happens there ? > > > > I don't see any evidence of anything being inlined in this module. I > > grepped the code to verify. > > > > Back to being stumped/stuck. > > Make sure to check the resulting assembler and ELF symbol tables. > > The compiler is free to inline various functions unless they are > explicitly marked as __attribute__((noinline)). Also, if LTO is enabled,
I could put that in the code just to make sure. It's a big function so doubt it but I'll try anything at this point ha, ha. I wondered if optimization could be doing it. I can provide the standard yocto environment script that's being source that was generated for the sdk: $ cat environment-setup-aarch64-poky-linux # Check for LD_LIBRARY_PATH being set, which can break SDK and generally is a bad practice # http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html#AEN80 # http://xahlee.info/UnixResource_dir/_/ldpath.html # Only disable this check if you are absolutely know what you are doing! if [ ! -z "${LD_LIBRARY_PATH:-}" ]; then echo "Your environment is misconfigured, you probably need to 'unset LD_LIBRARY_PATH'" echo "but please check why this was set in the first place and that it's safe to unset." echo "The SDK will not operate correctly in most cases when LD_LIBRARY_PATH is set." echo "For more references see:" echo " http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html#AEN80"; echo " http://xahlee.info/UnixResource_dir/_/ldpath.html"; return 1 fi export SDKTARGETSYSROOT=/opt/poky/3.1.24/sysroots/aarch64-poky-linux export PATH=/opt/poky/3.1.24/sysroots/x86_64-pokysdk-linux/usr/bin:/opt/poky/3.1.24/sysroots/x86_64-pokysdk-linux/usr/sbin:/opt/poky/3.1.24/sysroots/x86_64-pokysdk-linux/bin:/opt/poky/3.1.24/sysroots/x86_64-pokysdk-linux/sbin:/opt/poky/3.1.24/sysroots/x86_64-pokysdk-linux/usr/ bin/../x86_64-pokysdk-linux/bin:/opt/poky/3.1.24/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux:/opt/poky/3.1.24/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux-musl:"$PATH" export PKG_CONFIG_SYSROOT_DIR=$SDKTARGETSYSROOT export PKG_CONFIG_PATH=$SDKTARGETSYSROOT/usr/lib/pkgconfig:$SDKTARGETSYSROOT/usr/share/pkgconfig export CONFIG_SITE=/opt/poky/3.1.24/site-config-aarch64-poky-linux export OECORE_NATIVE_SYSROOT="/opt/poky/3.1.24/sysroots/x86_64-pokysdk-linux" export OECORE_TARGET_SYSROOT="$SDKTARGETSYSROOT" export OECORE_ACLOCAL_OPTS="-I /opt/poky/3.1.24/sysroots/x86_64-pokysdk-linux/usr/share/aclocal" export OECORE_BASELIB="lib" export OECORE_TARGET_ARCH="aarch64" export OECORE_TARGET_OS="linux" unset command_not_found_handle export CC="aarch64-poky-linux-gcc -mcpu=cortex-a53+crc+crypto -fstack-protector-strong -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=$SDKTARGETSYSROOT" export CXX="aarch64-poky-linux-g++ -mcpu=cortex-a53+crc+crypto -fstack-protector-strong -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=$SDKTARGETSYSROOT" export CPP="aarch64-poky-linux-gcc -E -mcpu=cortex-a53+crc+crypto -fstack-protector-strong -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=$SDKTARGETSYSROOT" export AS="aarch64-poky-linux-as " export LD="aarch64-poky-linux-ld --sysroot=$SDKTARGETSYSROOT" export GDB=aarch64-poky-linux-gdb export STRIP=aarch64-poky-linux-strip export RANLIB=aarch64-poky-linux-ranlib export OBJCOPY=aarch64-poky-linux-objcopy export OBJDUMP=aarch64-poky-linux-objdump export READELF=aarch64-poky-linux-readelf export AR=aarch64-poky-linux-ar export NM=aarch64-poky-linux-nm export M4=m4 export TARGET_PREFIX=aarch64-poky-linux- export CONFIGURE_FLAGS="--target=aarch64-poky-linux --host=aarch64-poky-linux --build=x86_64-linux --with-libtool-sysroot=$SDKTARGETSYSROOT" export CFLAGS=" -O2 -pipe -g -feliminate-unused-debug-types " export CXXFLAGS=" -O2 -pipe -g -feliminate-unused-debug-types " export LDFLAGS="-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -fstack-protector-strong -Wl,-z,relro,-z,now" export CPPFLAGS="" export KCFLAGS="--sysroot=$SDKTARGETSYSROOT" export OECORE_DISTRO_VERSION="3.1.24" export OECORE_SDK_VERSION="3.1.24" export ARCH=arm64 export CROSS_COMPILE=aarch64-poky-linux- # Append environment subscripts if [ -d "$OECORE_TARGET_SYSROOT/environment-setup.d" ]; then for envfile in $OECORE_TARGET_SYSROOT/environment-setup.d/*.sh; do . $envfile done fi if [ -d "$OECORE_NATIVE_SYSROOT/environment-setup.d" ]; then for envfile in $OECORE_NATIVE_SYSROOT/environment-setup.d/*.sh; do . $envfile done fi > further optimization can be done at link-time. > > One purpose of the UST tracepoints is to be less fragile with respect to > specific optimizations done by the compiler and linker, thus > guaranteeing that whatever is instrumented with a tracepoint is indeed > available for tracing. > > Also, double-check that the path you pass to --userspace-probe really > targets your executable or .so binary file, and is not just a symbolic link. It is full path. > > Thanks, > > Mathieu > > -- > Mathieu Desnoyers > EfficiOS Inc. > https://www.efficios.com > _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
