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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<mjw>
This could produce a slightly more helpful message:
<mjw>
Checking "/lib/modules/4.2.0-27-generic/build/.config" failed with error: No such file or directory
<mjw>
OK, no such file or directory, any hint what I missed/failed to install?
<mjw>
ah, I am in a chroot
<mjw>
still, any hint would be appreciated at that point
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<fche>
we did / do(?) suggest kernel-devel for that
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<fche>
mjw by the way nice job investigating the ubuntu/elfutils issue. you and Ravi are working very wel.
<fche>
better than my spelling
<mjw>
fche, Nope!
<mjw>
fche, systemtap_session::parse_kernel_config is called really early, it prints that error and returns an error and then it is exit.
<mjw>
But admittedly I didn't have anything except stap itself installed in that chroot. So it didn't have much to work with in the first place.
<mjw>
Yeah, I believe we figured it all out now.
<mjw>
I am writing my "counter proposal" patch now. It does the same as Ravi's does, but slightly more efficient (I believe, we don't have to search the whole debug subdir list twice just to try the non-.debug name)
<mjw>
Strangely enough I found newer ubuntu releases install the main /boot/vmlinux file as readable by root only
<mjw>
which causes slightly similar issues as Ravi found
<mjw>
it is a silly thing to do, because they /usr/lib/debug/..../vmlinux contains the whole image anyway (plus debuginfo of course).
<mjw>
anyway, I tested with that setup too, I believe we are good now.
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<fche>
thanks mark
<fche>
re. that kernel_config ... early check
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<fche>
ah yeah, that would explain it
<fche>
we need to fix that to tie into the normal missing-devel diagnostic
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