#systemtap on 2020-05-06 — 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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23:49 <agentzh> fche: what do you think of this patch? https://gist.github.com/agentzh/dace745192fa8752aa3ac489bb7f7a13

23:49 <agentzh> i ran into a kenrel panic due to dereferencing a NULL pointer at m->path.

23:50 <agentzh> on centos 6.

23:50 <agentzh> stap genreated a _stp_module_15 struct which does not initialize the .path field (the .name field is "kernel").

23:51 <agentzh> thanks for you attention.

23:51 <fche> agentzh,

23:51 <fche> hey, I am surprised that such a bug should exist, but can't think of any harm so go for it

23:51 <agentzh> cool, thanks

23:51 <fche> was this kernel configured some very unusual way?

23:52 <agentzh> nope, i'm using centos 6's stock kernel package.

23:52 <fche> weird

23:52 <agentzh> so i also wonder if the .path field should never be NULL?

23:52 <fche> could check a stap -kp4 tmpdir

23:52 <agentzh> i already got that tmpdir

23:53 <fche> what's your stap script? is it a simple reproducer?

23:53 <agentzh> the correspoinding snippet is like this: https://gist.github.com/agentzh/f95ddb650ab39d90821817015da8fe8a

23:53 <agentzh> *C code snippet

23:54 <agentzh> i'll try designing a minimal script.