"__tracepoint_sched_process_fork undefined" quand exécutez le script systemstap

Question

Les informations d'erreur:

WARNING: "__tracepoint_sched_process_fork" [/tmp/stapH5cHsd/stap_958d0ff0e571c9357f1e193511d8baa3_269311.ko] undefined! 
WARNING: "__tracepoint_sys_exit" [/tmp/stapH5cHsd/stap_958d0ff0e571c9357f1e193511d8baa3_269311.ko] undefined! 
WARNING: "__tracepoint_sys_enter" [/tmp/stapH5cHsd/stap_958d0ff0e571c9357f1e193511d8baa3_269311.ko] undefined! 
WARNING: "__tracepoint_sched_process_exec" [/tmp/stapH5cHsd/stap_958d0ff0e571c9357f1e193511d8baa3_269311.ko] undefined! 
WARNING: "__tracepoint_sched_process_exit" [/tmp/stapH5cHsd/stap_958d0ff0e571c9357f1e193511d8baa3_269311.ko] undefined! 
ERROR: Couldn't insert module '/tmp/stapH5cHsd/stap_958d0ff0e571c9357f1e193511d8baa3_269311.ko': Unknown symbol in module 
WARNING: /usr/bin/staprun exited with status: 1 
Pass 5: run failed. [man error::pass5] 
Tip: /usr/share/doc/systemtap/README.Debian should help you get started. 

Mon env:

# cat /proc/version 
Linux version 3.16.0-70-generic (buildd@lgw01-01) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)) #90~14.04.1-Ubuntu SMP Wed Apr 6 22:56:34 UTC 2016 

# stap -V 
Systemtap translator/driver (version 2.3/0.158, Debian version 2.3-1ubuntu1.4 (trusty)) 
Copyright (C) 2005-2013 Red Hat, Inc. and others 
This is free software; see the source for copying conditions. 
enabled features: AVAHI LIBSQLITE3 NSS TR1_UNORDERED_MAP NLS 

# dpkg --list | grep `uname -r` 

ii linux-headers-3.16.0-70-generic      3.16.0-70.90~14.04.1        amd64  Linux kernel headers for version 3.16.0 on 64 bit x86 SMP 
ii linux-image-3.16.0-70-generic       3.16.0-70.90~14.04.1        amd64  Linux kernel image for version 3.16.0 on 64 bit x86 SMP 
ii linux-image-3.16.0-70-generic-dbgsym     3.16.0-70.90~14.04.1        amd64  Linux kernel debug image for version 3.16.0 on 64 bit x86 SMP 
ii linux-image-extra-3.16.0-70-generic     3.16.0-70.90~14.04.1        amd64  Linux kernel extra modules for version 3.16.0 on 64 bit x86 SMP 
ii linux-signed-image-3.16.0-70-generic     3.16.0-70.90~14.04.1        amd64  Signed kernel image generic 


# sudo cat /proc/kallsyms | grep __tracepoint_sched_process_fork 
ffffffff81cecbe0 D __tracepoint_sched_process_fork 

Answer 1

Je pose cette question sur the maillist of systemtap, et je reçois rapidement la réponse. C'est parce que "L'API tracepoint a changé dans le noyau 3.15, et nous rattrapé ces changements dans systemtap 2.5", aka j'ai besoin d'une nouvelle version de systemtap. Après le téléchargement systemtap-2.6 et l'installer, cela fonctionne bien sans cette erreur.