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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<gromero>
hi. I've just updated to kernel 4.12-rc6 and my previous tap that was working fine on 4.10 now halts. Is it any known regression?
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<fche>
it's not a regression for old code to not work on new kernels; it's just probably a lack-of-porting
<drsmith>
my suspicion would be those kernel_long() calls, if it weren't for the fact that kernel_long() tries very hard to not cause a page fault.
<gromero>
looks like the without kernel_long() it works...
<gromero>
I'll get one of them back
<drsmith>
yeah, I'd try the +0 one first
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<fche>
hm, disable_pagefaults() no longer disabling pagefaults? :)
<gromero>
fche: drsmith did all over again, I confirm print_regs() is the culprit
<gromero>
since it's a modified versio of mine to inspect 128bits register on powerpc, it's my fault...
<drsmith>
ah, ok
<gromero>
drsmith: fche thanks a lot!
<gromero>
I'll investigate further why that kernel change messed up all
<drsmith>
if you think that modified version would be of use to others, email it to the list and we'll take a look at it and see if it makes sense to merge (minus the crash of course)
<fche>
or have an april-first random-crash option
<gromero>
lol
<gromero>
drsmith: fche sure I'll do, but has to work without that nasty crash... inspecting 128bit registers (FP/VEC/VSX) is indeed something important on powerpc...
<gromero>
stap is helping a lot, I want to contribute it back ;-)
<fche>
music to our ears!
<gromero>
:-)
<fche>
we'd love to read (and let the world read) about your successes / failures with the tool too
<gromero>
fche: sure! but I want to tell a success story :-)
<gromero>
fche: I'll keep in touch :-)
<fche>
better than the other kind
<gromero>
haha agree
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drsmith is now known as drsmith_away
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