[Bug translator/16764] registration error (rc -22): probe kernel.function("context_switch at kernel/sched/core.c:2105")

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16764

--- Comment #4 from Frank Ch. Eigler <fche at redhat dot com> ---
Thank you for your high-quality problem report.  I can reproduce it
immediately on my f19 x86-64 workstation.

The error value is coming from the kernel, and represents some
sort of problem the kprobes layer.  Disassembly of the region shows
this instruction within the inlined muck that makes up the
context_switch / __schedule clique.

ffffffff81683d78:       0f 1f 44 00 00          nopl   0x0(%rax,%rax,1)

I'm not sure why the kernel is rejecting a kprobe on that nop; it could
be a kernel-disassembler problem or some sort of blacklist.  It does not
appear to represent a systemtap bug, so closing as INVALID.


Luckily, approximately the same spot can be probed via tracepoints:

probe kernel.trace("sched_switch") { }

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