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semantic error: libdwfl failure (dwfl_linux_kernel_report_modules): Exec format error
- From: Esther Horbert <horbert at lfbs dot RWTH-Aachen dot DE>
- To: systemtap at sources dot redhat dot com
- Date: Wed, 30 Jan 2008 17:37:43 +0100
- Subject: semantic error: libdwfl failure (dwfl_linux_kernel_report_modules): Exec format error
Hi!
I got the following problem after installing systemtap while trying out
the example from the webpage
(http://sourceware.org/systemtap/wiki/SystemtapOnUbuntu).
We installed like described here:
http://sourceware.org/systemtap/wiki/SystemtapOnDebian only installed
the kernel manually (make install).
Does somebody know what this Exec format error means and how to fix it?
# stap -vvv -e 'probe kernel.function("sys_open") {log("hello world")
exit()}'
Created temporary directory "/tmp/stapPOB94Z"
Searched '/usr/share/systemtap/tapset/2.6.20-oprofile/i686/*.stp', match
count 0
Searched '/usr/share/systemtap/tapset/2.6.20-oprofile/*.stp', match count 0
Searched '/usr/share/systemtap/tapset/2.6.20/i686/*.stp', match count 0
Searched '/usr/share/systemtap/tapset/2.6.20/*.stp', match count 0
Searched '/usr/share/systemtap/tapset/2.6/i686/*.stp', match count 0
Searched '/usr/share/systemtap/tapset/2.6/*.stp', match count 0
Searched '/usr/share/systemtap/tapset/i686/*.stp', match count 1
Searched '/usr/share/systemtap/tapset/*.stp', match count 33
Searched '/usr/share/systemtap/tapset/LKET/2.6.20-oprofile/i686/*.stp',
match count 0
Searched '/usr/share/systemtap/tapset/LKET/2.6.20-oprofile/*.stp', match
count 0
Searched '/usr/share/systemtap/tapset/LKET/2.6.20/i686/*.stp', match count 0
Searched '/usr/share/systemtap/tapset/LKET/2.6.20/*.stp', match count 0
Searched '/usr/share/systemtap/tapset/LKET/2.6/i686/*.stp', match count 0
Searched '/usr/share/systemtap/tapset/LKET/2.6/*.stp', match count 0
Searched '/usr/share/systemtap/tapset/LKET/i686/*.stp', match count 0
Searched '/usr/share/systemtap/tapset/LKET/*.stp', match count 19
Pass 1: parsed user script and 53 library script(s) in
310usr/10sys/439real ms.
semantic error: libdwfl failure (dwfl_linux_kernel_report_modules): Exec
format error
Ensure kernel debuginfo is installed
while: resolving probe point kernel.function("sys_open")
Pass 2: analyzed script: 0 probe(s), 0 function(s), 0 global(s) in
10usr/0sys/36real ms.
Pass 2: analysis failed. Try again with more '-v' (verbose) options.
Running rm -rf /tmp/stapPOB94Z
# dpkg -l libdw-dev elfutils
ii elfutils 0.123-3
collection of utilities to handle ELF objects
ii libdw-dev 0.123-3
library that provides access to the DWARF debug information
# ls -l /boot/vmlinux-$(uname -r)
-rwxr-xr-x 1 root root 43252479 2008-01-30 16:21
/boot/vmlinux-2.6.20-oprofile
# zcat /proc/config.gz
CONFIG_KALLSYMS=y
CONFIG_PROFILING=y
CONFIG_OPROFILE=y
CONFIG_KPROBES=y
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_INFO=y
...
Thanks!