Problem with vfs probe on Proxmox kernel

[Adam Guderski]

Hello,

I've got problem running sample traceio.stp script (obtained from
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/SystemTap_Beginners_Guide/#traceio2)
on Proxmox VE 4.4 system. Proxmox is a Debian-based Linux distro which
uses a custom Ubuntu-based kernel. The Proxmox repository does not
provide a kernel with debug symbols, so I had to compile it from
provided sources - version 4.4.35-2-pve, to be specific. Debian repos
(jessie) provide systemtap in version 2.9, which from what I read does
not support 4.4 kernels, so I compiled systemtap from sources (from
master branch, version 3.1/0.159).

With such setup, I'm able to run sample "hello world" stap script and
couple of others, but all scripts with vfs probes fail. I attach full
verbose (-vvv) output here: http://pastebin.com/DiWMsrtr, but I think
the main error can be explained below. What can I do about it? I
searched for couple of hours but did not find anything that would help.

Best regards,
Adam


# stap -v traceio2.stp 0xfb00
Pass 1: parsed user script and 119 library scripts using
71608virt/43716res/4464shr/39904data kb, in 140usr/0sys/132real ms.
semantic error: while resolving probe point: identifier 'kernel' at
/usr/local/share/systemtap/tapset/linux/vfs.stp:987:19
        source: probe vfs.write = kernel.function("vfs_write")
                                  ^

semantic error: missing x86_64 kernel/module debuginfo [man
warning::debuginfo] under '/lib/modules/4.4.35-2-pve/build'

semantic error: resolution failed in alias expansion builder

semantic error: while resolving probe point: identifier 'vfs' at
traceio2.stp:14:7
        source: probe vfs.write, vfs.read
                      ^

semantic error: no match

semantic error: while resolving probe point: identifier 'kernel' at
/usr/local/share/systemtap/tapset/linux/vfs.stp:915:18
        source: probe vfs.read = kernel.function("vfs_read")
                                 ^

semantic error: missing x86_64 kernel/module debuginfo [man
warning::debuginfo] under '/lib/modules/4.4.35-2-pve/build'

semantic error: resolution failed in alias expansion builder

semantic error: while resolving probe point: identifier 'vfs' at
traceio2.stp:14:18
        source: probe vfs.write, vfs.read
                                 ^

semantic error: no match

Pass 2: analyzed script: 1 probe, 33 functions, 1 embed, 1 global using
72384virt/46080res/6016shr/40680data kb, in 40usr/100sys/146real ms.
Pass 2: analysis failed.  [man error::pass2]