#systemtap on 2016-05-10 — 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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22:14 <joko> Hello, could I do something similar to this: https://coffeeortech.wordpress.com/2011/07/05/dtrace-saves-the-day/ ??

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22:15 <joko> I'm using lxc containers instead of solaris zones and I think I'm having the same issue

22:20 <fche> hi

22:22 <joko> hey

22:22 <fche> yeah in theory the same sort of approach would work (just with a different syntax)

22:22 <fche> so flexlm hasn't fixed this problem in five+ years? :)

22:23 <joko> most likely :D

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22:25 <joko> Could anyone help me with running systemtap inside an lxc container?

22:26 <fche> something vaguely like probe syscall.getdents.return { if (execname() == "YYYY") { @cast(@entry($dirp),"struct linux_dirent")->d_ino = NNNN; } }

22:26 <fche> might do the trick

22:26 <fche> re. lxc, you don't need to run stap -within- the container; just run it in the host. it should have access to all the processes

22:26 <fche> but anyway that script would need many more filters (unless that YYYY program only ever does one dirent() type syscall, and that's the one you need to fix)

22:26 <fche> anyway

22:27 <fche> something like that might work; /me must unfortunately bow out now for about 120 mins

22:28 <joko> fche: it's ok, it's getting late here, so I will have to leave, as weel

22:28 <joko> well *

22:28 <joko> I will make a try tomorrow

22:28 <fche> tomorrow then

22:28 <joko> Many thanks for your help

22:29 <fche> (by the way, process level probes - i.e., probe process(".../libc.so.6").function("readdir") ... - may also work

22:30 <fche> instead the syscall level