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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<kerneltoast>
fche, weekend's over
<kerneltoast>
time to fix some bugsies
<kerneltoast>
how much do you know about the uprobe code?
<fche>
I have had that part of my brain surgically removed
<kerneltoast>
can't remove what doesn't exist
<kerneltoast>
in any case
<kerneltoast>
"Error removing uprobe at pid 6577 vaddr 0x7ff5c1c42ee0: can't restore original instruction"
<kerneltoast>
what does this mean to you
<fche>
means the kernel is Not Happy
<fche>
this is beneath systemtap's code base
<kerneltoast>
we hit it on centos6 kernels
<kerneltoast>
and i have no clue what it means
<fche>
ah centos6
<fche>
hm so that uprobe is our uprobe
<fche>
well, other than this message ... is anything wrong?
<kerneltoast>
the process dies from a SIGTRAP
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<fche>
no funeral dirge
<fche>
mournful sigh
<kerneltoast>
that process was like family to me
<kerneltoast>
and now he's gone
<kerneltoast>
fallen into a trap
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<agentzh>
fche: does the old centos6 utrace/uprobe patch support parallel probing on the same target process?
<agentzh>
wondering if it's the parallell probing on the same target limitation.
<agentzh>
glad the 7k kernel fuzzing indeed found some real stap bugs.
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<agentzh>
there are still 125 kernels with freezes/panics when running stap. they will need our investigations. most of them are from ubuntu 16.04's official repos. the rest are from other ubuntu and debian versions.
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<agentzh>
so the red hat family should be clean now.
<agentzh>
it takes a week to fuzz 7k+ kernels for a single round.
<agentzh>
time to add more amd big boxes...
<agentzh>
we currently only cover x86_64 kernels.
<agentzh>
will take on aarch64 kernels soon.
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<kerneltoast>
fche, btw you should migrate the buildbots to parallel testing
<agentzh>
good idea
<irker482>
systemtap: craig.ringer systemtap.git:master * release-4.4-73-gb24ef7bb1 / man/stap.1.in: man/stap.1: add example about composing macros & embedded-c expressions
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<agentzh>
fche: btw, thanks for the procfs fix. it's working for us now.