#systemtap on 2016-02-09 — irc logs at freenode.irclog.whitequark.org

2015-11-12 23:18 fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged

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09:54 <sin8h> hi folks, I'm trying to leverage systemtap hooks within Erlang VM

09:55 <sin8h> but facing some issue(followed procedure as outlined http://erlang.org/doc/apps/runtime_tools/SYSTEMTAP.html)

09:57 <sin8h> this is the error I see:

09:57 <sin8h> https://gist.github.com/abhi-bit/6f35aef1aa9abf836a19

09:57 <sin8h> any suggestion on what I should be looking for?

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14:53 <lorddoskias> hello, when i try to run stap on 4.4.0 kernel i get th efollowing errors: http://pastebin.com/8UGbBEH0

14:53 <lorddoskias> before that it was working flawlessly on 3.12 kernel

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15:05 <fche> lorddoskias, hi

15:06 <lorddoskias> hey there

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15:06 <fche> as man error::pass4 advises, that looks like a stap portability problem

15:07 <fche> it was fixed in stap upstream with git commit #3d010295ef

15:07 <fche> but I don't think we've spun up a new stap release with that fix in yet

15:07 <fche> (as error::pass4 says, use git-built systemtap for fresh kernels)

15:09 <lorddoskias> i did use that, however i haven't refreshed recently, i guess i will have to do it, thanks :)

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15:17 <fche> righto

15:17 <fche> let us know if there is still a problem

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15:23 <lorddoskias> fche: yep, with trunk it works :)

15:23 <fche> good stuff.

15:23 <fche> thanks for testing

15:24 <lorddoskias> is there a way to conditionalize the probes based on kernel version

15:24 <fche> why sure, several ways

15:24 <lorddoskias> since on 3.12 and 4.4 the thing i'm interested is on different lines

15:24 <fche> see man stap for %( kernel_v <= "2.6.23" ...") preprocessors

15:25 <fche> -or- use start-relative statement probe line numbers .statement("foo@zoo.c+5") (note +)

15:25 <fche> -or- use line ranges, ? ! optional probe point conditionals, etc.

15:25 <fche> several ways to skin the cat

15:25 <fche> (pro tip: make sure cat is dead first)

15:25 <lorddoskias> holy, shit ;)

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15:31 <irker381> systemtap: fche systemtap.git:refs/heads/master * release-2.9-273-gc5d75ad / man/error::pass4.7stap: error::pass4 - emphasize building stap from git for fresh kernels http://tinyurl.com/zuzey8s

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