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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<walac> Hi there, I have this little script https://irccloud.mozilla.com/pastebin/s9K6a47V/
<walac> When I try to run it, I get this error: https://irccloud.mozilla.com/pastebin/lXwVTy2V/
<walac> dmesg shows stap_dbc409fd3eb904278eba1fa64db719e3_10074: Unknown symbol task_work_cancel (err -2)
<walac> I am runnign ubuntu disco with kernel Linux vagrant 5.0.0-17-generic #18-Ubuntu SMP in a vagrant box. Searching in web showed no clue what's wrong
<walac> I see this task_work_cancel function in the Linux sources
<walac> Any tips?
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<fche> walac, what systemtap version is this?
<walac> fche: git HEAD
<walac> btw, it runs if I use only the first probe
<fche> hm, stap -V to double check?
<fche> stap runs on 5.0 / 5.1 just fine around here, so something is odd there
<fche> task_work_cancel hasn't been directly referred to in quite a few years (commit 50bd2c22a)
<fche> yeah that's pretty clear-cut
<fche> walac, could you pastebin a giant stap --poison-caches -vvvvv $options trace?
<fche> am curious about its kernel version adaptation in this case
<fche> an identifier called STAPCONF_TASK_WORK_ADD_EXPORTED specifically, but really the whole thing
<walac> fche: I get "stap: unrecognized option '--poison-caches'"
<fche> sorry s/caches/cache/
<walac> fche: $options between ''?
<fche> nah just -v valgrind.stp
<fche> what you had before
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<fche> hm ok
<fche> one more thing: the valgrind.stp script itself would be good
<fche> and if you're feeling generous :-) the directory created by stap -k <ALL_OTHER_OPTIONS>
* walac generates the directory
<fche> pretty vanilla script, good
<fche> (btw it runs fine here on fedora30, with a newer kernel)
<walac> hrm, that gives me options... thanks for the info
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<irker885> systemtap: wcohen systemtap.git:refs/heads/master * release-4.1-52-g5c076da / systemtap.spec: Eliminate ambiguous python shebangs http://tinyurl.com/y53ut6d3
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<walac> fche: fyi, it also works on ubuntu 18.04, usign stap Systemtap translator/driver (version 3.1/0.170, Debian version 3.1-3ubuntu0.1 (bionic-proposed))
<fche> with the verysame kernel?
<irker885> systemtap: sapatel systemtap.git:refs/heads/sapatel/pr23285 * release-4.1-74-gaf652f8 / elaborate.cxx stapbpf/stapbpf.cxx: more cleanup http://tinyurl.com/y5ukrxx7
<irker885> systemtap: sapatel systemtap.git:refs/heads/sapatel/pr23285 * release-4.1-75-g833e2b1 / bpf-translate.cxx elaborate.cxx stapbpf/bpfinterp.cxx stapbpf/bpfinterp.h stapbpf/stapbpf.cxx tapset-procfs.cxx: added comments http://tinyurl.com/y596ff7w
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<walac> fche: kernel 4.15
<fche> hi walac, haven't forgotten about you :)
<walac> fche: thanks :)
<walac> btw, when I try to get stack trace through print_backtrace() I always get a "(0) unexact" message (or something like that)
<walac> this on kernel 4.15 with stap 3.1
<fche> it's possible that the ubuntu kernel image strips out the unwinding data
* walac git clone ubuntu kernel
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<irker885> systemtap: sapatel systemtap.git:refs/heads/sapatel/pr23285 * release-4.1-76-g5c5914f / stapbpf/stapbpf.cxx: disabled premature deletion of directory http://tinyurl.com/y44yhp42
<irker885> systemtap: sapatel systemtap.git:refs/heads/sapatel/pr23285 * release-4.1-77-gb203292 / stapbpf/Makefile.am stapbpf/Makefile.in stapbpf/stapbpf.cxx: used better cleaning mechanism http://tinyurl.com/y4okjjob
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