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Questions tagged [systemtap]

Systemtap is tool to probe or trace a running linux system, supporting visibility into both kernel- (its initial focus) and user-space. It uses dynamically loaded probes to gather performance and tracing data about the whole system or just selected processes.

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sock_sendmsg(): implicit function calls by Kernel

I tried to dump all data sent by a specific process on Linux by hooking a handler to the Kernel's function sock_sendmsg() defined in linux/socket.c. I could do that by writing a systemtap probe handler for probe…
user2875834
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Systemtap, printing target's local vars and ellipsis

I'm running systemtap 2.2.1 on ubuntu 13.10 with kernel 3.11.0-generic. The following script probe begin { printf("Started...\n") } probe kernel.function("netif_receive_skb") { printf("%s\n",$skb$$); exit(); } prints the following…
jliendo
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systemtap failure to find trace events on Ubuntu 3.2

systemtap fails to find trace events, even though all of them are available in directory:/sys/kernel/debug/tracing/events. Running "perf record sched" finds all the sched trace events without any issue. System is running: Linux (none)…
user2464401
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SystemTap failed with error "WARNING: kbuild exited with status: 2"

I built a custom kernel 3.2-41, required kernel-debuginfo-common and kernel-debuginfo packages. I installed these packages on CentOS System with kernel 2.6.32-358. System booted fine with new kernel. I ran stap to list system calls and kernel…
user2464401
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How to use stapdev and stapusr groups for SystemTap?

I have tried to add myself to stapdev and stapusr in order to run stap without sudo. I'm trying to run a simple example but getting an error as such: $ groups gokce adm cdrom sudo dip plugdev lpadmin sambashare stapdev stapusr $ cat hello.stp probe…
none
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How can a SystemTap script determine the current thread count?

I want to write a SystemTap script that can determine the actual number of threads for the current PID inside a probe call. The number should be the same as shown in the output of /proc/4711/status in this moment. My first approach was to count…
Peter Tröger
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Compiling erlang with systemtap but require dtrace

I'm compiling erlang otp from source like following: ./configure --with-dynamic-trace=systemtap But it reports error: checking for dtrace... no configure: error: No dtrace utility found. I think systemtap is for linux usage and it is different…
goofansu
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Problems with systemtap script

I wanna write a small script that identifies which function is using the mmap syscall: #! /usr/bin/env stap probe syscall.mmap.return { if ( execname()=="java") printf ("%s mmap caller\n", caller()) } But it…
Roger J
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Systemtap script to C code conversion and compilation

My semester project is a Network Level Anti-Malware S/W. It main components are the Manager and the Agent. The Agent provides the Manager with: 1. CPU usage, Memory usage and B/W usage information 2. Network related Information - Network…
Ananth
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how to install SystemTap on Ubuntu

I am new to Ubuntu. I follow the instruction from http://sourceware.org/systemtap/wiki/SystemtapOnUbuntu that is necessary to install SystemTap on Ubuntu. I lost in Step 4. How can i run step 4: ? Setp 4: sudo apt-get install elfutils, for…
jeevan thapa
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systemtap parse error: unexpected end-of-file

I run command sudo stap -ve 'probe begin { log("hello world") exit() }' and the output is parse error: unexpected end-of-file saw: keyword at :1:1 source: probe ^ 1 parse error. Pass 1: parsed user script and 490…
yiC
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Error in cross-compiling systemtap for embedded Linux devices

I'm having trouble cross-compiling systemtap under ubuntu 18.04 Here are the compile-time errors ➜ systemtap-master ./configure --prefix=$PWD/_install --host=aarch64-linux-gnu --with-elfutils=/home/zhongyi/tools/elfutils-0.188 CXXFLAGS=-static…
Carlos
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systemtap fails to determine souce filenames and line numbers, although gdb finds them

I am running systemtap 4.7 on Centos 8 with a 4.18 kernel and using GCC 8.5.0 When I have systemtap produce a user-code backtrace, it never manages to find the filenames and line numbers for my source functions, despite there being a full .debuginfo…
swestrup
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How to retrieve and print the value of local a struct field in Systemtap without specifying line number?

I modified the kernel introducing a new socket option, as well as a new field in the sock struct. As of now, this works: probe kernel.statement("sock_setsockopt@sock.c:730") { printf("%ul\n", $sk->sk_foo) } But as soon as I use regex: probe…
Eric Gumba
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semantic error: unresolved target-symbol expression: identifier '$filename'

I'm trying to follow some simple examples like this one here: probe syscall.open.return { filename = user_string($filename) if (execname() != "yakuake"){ printf("%s(%d) open (%s)\n", execname(),pid(),filename) } } That I've found in the…
Fernando
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