02:30 <lyc> liyichao@trace01.aws.dev:~/systemtap_scripts$ sudo stap --vp 1 -e 'global ops; probe syscall.* { if (15537) {print("called");}}'

02:30 <lyc> Pass 1: parsed user script and 107 library script(s) using 87884virt/32860res/5324shr/28220data kb, in 120usr/10sys/139real ms.

02:30 <lyc> WARNING: Eliding unused variable 'ops': identifier 'ops' at <input>:1:8

02:30 <lyc> source: global ops; probe syscall.* { if (15537) {print("called");}}

02:30 <lyc> ^

02:30 <lyc> Pass 4: compilation failed. [man error::pass4]

02:30 <lyc> Tip: /usr/share/doc/systemtap/README.Debian should help you get started.

02:30 <lyc> I change `syscall.*` to `syscall.open` and then it works, it seems `syscall.*` probe is not supported.

02:31 <lyc> I tried sytemtap 3.0 & 2.6

02:31 <lyc> The same.

02:31 <lyc> Does anyone has any clues?

10:45 <Guest23406> hello, i've got a question: for my thesis I am tapping some shared libraries of httpd and openssl. Aside that i also tap things like tcp.recvmsg. On some runs systemtap seems to work fine and taps all the requested functions, but on some runs it only taps the syscalls (like socket_recvmsg). any pointers on what could cause this?

10:46 <Guest23406> i already tried --disable-cache, but even with that, rm'ing ~/.systemtap/cache and /tmp/stap* seems to be the only solution. i am running systemtap on fedora21.

10:49 <Guest23406> stap --version gives me "Systemtap translator/driver (version 2.9/0.163, rpm 2.9-1.fc21)"

11:38 <fche> Guest23406, it is a bug if any manual cache-related operations were needed to make your script run properly

11:39 <fche> in your .systemtap/cache/* subdirectories, you'll find a FOO_hash.log file that enumerates all the parameters that go into the hash/id generation algorithm

11:40 <fche> if you can reproduce the failure, that file would be very helpful to see

11:40 <fche> (as would the stap console transcript with some good healthy verbosity)

12:24 <Guest23406> i will have a look at those and see if i can reproduce.

12:42 <Guest23406> alright, it gets interesting. when i run my script with --disable-cache it does not create anything under /tmp and ~/.systemtap/cache

12:43 <Guest23406> nevertheless it fails. maybe the problem is with my code, i try to track some stuff the children of httpd do, is there a builtin method of systemtap to track children as well?

12:44 <Guest23406> so far i do the tracking myself by tapping nd_syscall.do_fork.return and kprocess.create

12:44 <Guest23406> the syscall tapsets work fine, but the shared libraries i am tapping do not seem to work.

14:29 <irker984> systemtap: flu systemtap.git:refs/heads/master * release-3.0-191-g42cc9cc / tapset/linux/vfs.stp: PR19906: absolute pathnames for vfs.* probes http://tinyurl.com/j5q9wae

18:11 <irker984> systemtap: flu systemtap.git:refs/heads/master * release-3.0-192-ge8b46a9 / NEWS main.cxx man/stapprobes.3stap parse.cxx parse.h: PR10485: auto-path tapset support http://tinyurl.com/zyzfumb