On Monday, September 21, 2015 7:15:59 AM Lukáš Oliva wrote: > Hi, > I am trying SystemTap - a tool for dynamic tracing on Gentoo and I have > some troubles to make it working. I followed the guide on > > https://sourceware.org/systemtap/wiki/SystemTapWithSelfBuiltKernel > > and built the kernel with required options: > > zgrep -E > 'CONFIG_DEBUG_INFO|CONFIG_KPROBES|CONFIG_RELAY|CONFIG_DEBUG_FS| CONFIG_MODULES|CONFIG_MODULE_UNLOAD|CONFIG_UPROBES|CONFIG_DEBUG_INFO' > /proc/config.gz > CONFIG_RELAY=y > CONFIG_KPROBES=y > CONFIG_UPROBES=y > CONFIG_MODULES_USE_ELF_RELA=y > CONFIG_MODULES=y > CONFIG_MODULE_UNLOAD=y > CONFIG_DEBUG_INFO=y > # CONFIG_DEBUG_INFO_REDUCED is not set > # CONFIG_DEBUG_INFO_SPLIT is not set > CONFIG_DEBUG_INFO_DWARF4=y > CONFIG_DEBUG_FS=y > # CONFIG_KPROBES_SANITY_TEST is not set > > But even the simplest check fails on: > > stap -r /usr/src/linux -v -e 'probe vfs.read {printf("read performed\n"); > exit()}' > Pass 1: parsed user script and 122 library script(s) using > 214692virt/125980res/5604shr/122476data kb, in 450usr/20sys/464real ms. > Pass 2: analyzed script: 1 probe(s), 1 function(s), 3 embed(s), 0 global(s) > using 347656virt/260520res/6984shr/255440data kb, in > 1210usr/250sys/1462real ms. > Pass 3: translated to C into > "/tmp/stap2nY7sY/stap_9aad5fb97c53bb7c4bc51dce0ccbb236_1259_src.c" using > 347656virt/260772res/7236shr/255440data kb, in 0usr/0sys/4real ms. > In file included from /usr/share/systemtap/runtime/linux/task_finder.c:17:0, > from /usr/share/systemtap/runtime/linux/runtime.h:206, > from /usr/share/systemtap/runtime/runtime.h:24, > from > /tmp/stap2nY7sY/stap_9aad5fb97c53bb7c4bc51dce0ccbb236_1259_src.c:24: > /usr/share/systemtap/runtime/linux/task_finder2.c: In function > '__stp_call_mmap_callbacks_with_addr': > /usr/share/systemtap/runtime/linux/task_finder2.c:695:24: error: 'struct > file' has no member named 'f_dentry' > dentry = vma->vm_file->f_dentry; > ^ > /usr/share/systemtap/runtime/linux/task_finder2.c: In function > '__stp_call_mmap_callbacks_for_task': > /usr/share/systemtap/runtime/linux/task_finder2.c:1198:42: error: 'struct > file' has no member named 'f_dentry' > vma_cache_p->dentry = vma->vm_file->f_dentry; > ^ > scripts/Makefile.build:258: recipe for target > '/tmp/stap2nY7sY/stap_9aad5fb97c53bb7c4bc51dce0ccbb236_1259_src.o' failed > make[1]: *** > [/tmp/stap2nY7sY/stap_9aad5fb97c53bb7c4bc51dce0ccbb236_1259_src.o] Error 1 > Makefile:1390: recipe for target '_module_/tmp/stap2nY7sY' failed > make: *** [_module_/tmp/stap2nY7sY] Error 2 > WARNING: kbuild exited with status: 2 > Pass 4: compiled C into "stap_9aad5fb97c53bb7c4bc51dce0ccbb236_1259.ko" in > 3230usr/260sys/4290real ms. > Pass 4: compilation failed. [man error::pass4] > > I am wondering now - is there anything wrong with my aproach? Does anyone > succesfully use SystemTap on Gentoo? And if so, could you help me to make > this running? > > Lukas
It is outdated. It's trying to build a module that was written for an old kernel. I remember that change because it broke some module for me, I think it was on kernel 3.12.x or 3.14.x -- Fernando Rodriguez
