16:13 <changcheng> @fche: stap insmode problem has been solved on ubuntu 18.04 if Secure boot is enabled: lift the lockdown kernel

16:16 <changcheng> On ubuntu 18.04, does anyone run strace-open.stp successfully. strace-open.stp is in https://sourceware.org/systemtap/tutorial.pdf

16:16 <changcheng> I always hit below problem even though the kernel/debug symbol has been installed:

16:17 <changcheng> stap -v strace_open.stp

16:17 <changcheng> semantic error: while resolving probe point: identifier 'syscall' at strace_open.stp:1:7

16:17 <changcheng> source: probe syscall.open

17:04 <fche> changcheng, how recent is this version of stap?

17:05 <changcheng> stap --version

17:05 <changcheng> Systemtap translator/driver (version 3.1/0.170, Debian version 3.1-3ubuntu0.1 (bionic-proposed))

17:05 <changcheng> tested kernel versions: 2.6.18 ... 4.10-rc8

17:05 <fche> and what's the kernel version?

17:05 <changcheng> Linux version 4.18.0-15-generic (buildd@lcy01-amd64-029) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #16~18.04.1-Ubuntu SMP Thu Feb 7 14:06:04 UTC 2019

17:06 <fche> ok, so I assume someone backported -some- new-kernel-support code into that old version of systemtap, but probably not enough

17:06 <changcheng> So, I need upgrade systemtap?

17:08 <fche> yup, pretty sure.

17:08 <changcheng> Any document guide for ubuntu 18.04?

17:08 <fche> as in how to build it yourself?

17:08 <changcheng> build/install on ubuntu 18.04

17:08 <changcheng> yes

17:09 <fche> the main README file should be enough

17:09 <fche> # apt-get build-dep systemtap

17:09 <fche> % configure; make; # make install kind of thing

17:09 <changcheng> What's other accessory componet do I need upgrade at the same time?

17:10 <changcheng> Does ubuntu has the plan to upgrade systemtap officially for systemtap?

17:10 <fche> the ubuntu package folks for systemtap do not regularly coordinate with us

17:12 <changcheng> Thanks for your info. I'm wondering whether to finish this as one deal or use bpftrace.

17:12 <changcheng> I'll try to build/install it by myself firstly.

17:12 <fche> does ubuntu package an up-to-date bpftrace?

17:12 <changcheng> I haven't tried it yet.

17:13 <changcheng> I'm working on storage(ceph) & android development. I need some tools to debug the hard problem.

17:14 <fche> aha. yeah, you're wise to keep in mind all the alternative tools that are applicable.

17:14 <fche> we'd be glad to try to get you going on stap while you wish to do so

17:15 <changcheng> Thanks. Have a good day. Sleep now(PRC: 01:15 now)

17:15 <fche> good night!