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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<jbalint>
hi, i'm getting this error on '$return' from one of the example scripts. any hints? http://pastebin.com/BMLxtujF
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<fche>
hi
<fche>
what does stap -L 'kernel.function("copy_process")' show on your machine?
<jbalint>
thanks fche. it just prints it out
<fche>
ok, man error::pass2 should have some hints
<fche>
my guess is that what's wrong here is missing kernel debugging information, but not sure.
<fche>
($return is a special case)
<fche>
can you run stap-report and paste the results?
<jbalint>
anything specific that would/wouldn't show?
<fche>
with kernel debugging data available, you should be getting somethign like
<fche>
kernel.function("copy_process@kernel/fork.c:1243") $clone_flags:long unsigned int $stack_start:long unsigned int $stack_size:long unsigned int $child_tidptr:int* $pid:struct pid* $trace:int $tls:long unsigned int $cgrp_ss_priv:void*[]
<fche>
ie a list of the various context variables available
<jbalint>
hrm, yeah i don't see anything like that
<jbalint>
if I run -L with syscall.read I get a lot more stuff
<fche>
"Because Arch permanently strips debugging data from its distributed binaries (including the kernel), many normal/fancier systemtap capabilities are simply not available,"
<fche>
now I'd have expected stap to print an [man error::dwarf] message to give a better hint
<jbalint>
yeah i see "If a script requires such data, but the compiler did not preserve enough of it, pass-2 errors may result."
<jbalint>
ok, I guess i'll build myself a new kernel
<fche>
yeah, the arch distro is shooting itself in the foot a bit with the strip-debuginfo policy :(
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<jbalint>
can't it be included as a separate package?
<fche>
AIUI, arch in general strips debuginfo during builds, kernel & userspace
<fche>
so this frustrates debugging (whether with stap or gdb or whatever)
<fche>
but AIUI arch users are used to rebuilding software they want to debug :(
<fche>
anyway that's a distro philosophy choice
<fche>
(fedora goes the other way)
<jbalint>
yeah, i don't have a problem building most things but kernel is a bit less convenient
<fche>
yeah.
<jbalint>
i was not aware of this, finding most things a bit more developer friendly as there are no separate packages for headers
<jbalint>
(kernel aside)
<fche>
I see what you mean - if disk space is not scarce, installing bits like that by default can be good.
<jbalint>
thanks a lot fche
<fche>
no problem, wish we could do more. arch IMHO should revisit this issue.
<jbalint>
yeah maybe i'll bring it up on the forum and see what kind of response I get
<fche>
thanks! please let us know if there's any sympathy
<jbalint>
but often times I would rather go get work done instead of arguing trivialities
<jbalint>
sure thing
<fche>
yeah. I guess one person's triviality is another's obstruction
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