------- Comment From [email protected] 2016-02-15 11:06 EDT-------
Hi fche,
I think setting variable won't work in this case. Still I tried with
that on ubuntu poweprc. Here is what I got:
===========
# export SYSTEMTAP_DEBUGINFO_PATH=/usr/lib/debug/boot
# echo $SYSTEMTAP_DEBUGINFO_PATH
/usr/lib/debug/boot
# strace -o out -e open ./stap -v probe.stp
Pass 1: parsed user script and 95 library script(s) using
41792virt/32064res/5952shr/25408data kb, in 180usr/10sys/188real ms.
WARNING: cannot find module kernel debuginfo: No DWARF information found [man
warning::debuginfo]
semantic error: while resolving probe point: identifier 'kernel' at
probe.stp:1:7
source: probe kernel.function("do_fork")
^
semantic error: no match
Pass 2: analyzed script: 0 probe(s), 0 function(s), 0 embed(s), 0 global(s)
using 66304virt/35072res/7488shr/26368data kb, in 0usr/0sys/6real ms.
Pass 2: analysis failed. [man error::pass2]
Tip: /usr/share/doc/systemtap/README.Debian should help you get started.
# cat out | grep vmlinu
open("/boot/vmlinux-3.13.0-76-generic", O_RDONLY) = 3
open("/lib/modules/3.13.0-76-generic/build/vmlinux.id", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/usr/lib/debug/boot/boot/vmlinux-3.13.0-76-generic.debug", O_RDONLY) = -1
ENOENT (No such file or directory)
open("/usr/lib/debug/boot/vmlinux-3.13.0-76-generic.debug", O_RDONLY) = -1
ENOENT (No such file or directory)
open("/usr/lib/debug/boot/boot/vmlinux-3.13.0-76-generic.debug", O_RDONLY) = -1
ENOENT (No such file or directory)
open("/usr/lib/debug/boot/vmlinux-3.13.0-76-generic.debug", O_RDONLY) = -1
ENOENT (No such file or directory)
#
===========
If stap (which internally uses elfutils) finds /boot/vmlinux file, and debuginfo
is not present in it, it uses it as "main elf" and looks for debuginfo file
with ".debug"
extension(i.e. vmlinux-RELEASE.debug). Ubuntu installs debuginfo without any
extension (i.e. vmlinux-RELEASE).
If it does not able to find vmlinux from /boot/ it goes on continue looking for
fie on
other paths without ".debug" extension. And it finds proper file. RHEL/Fedora on
powerpc uses /boot/vmlinuz name without actually compressing it. Hence stap
works in these distros.
In short, setting SYSTEMTAP_DEBUGINFO_PATH won't change existing functionality.
It will only change list of paths where to look for debuginfo file.
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https://bugs.launchpad.net/bugs/1537125
Title:
ubuntu-14.04.04: fail to run systemtap test suites
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