[Bug translator/6749] New: tolerate failed kprobe_register calls

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

On one peculiar kernel (fedora rawhide, 2.6.26-0.131.rc9.git9.fc10.i686),
some symbols ("panic", "printk") for show up after the _etext symbol.
(.text.unlikely?).  register_kprobes()' kernel_text_address() test refuses
to probe these guys.  That in turn leads the translator-generated probe
setup loop to abort:

c04010e8 T _stext
c066b6d0 T __kprobes_text_start
c066e434 T __kprobes_text_end
c066f0ce T _etext
c066f133 T panic

# stap -e 'probe kernel.function("panic") {}'
ERROR: probe .... registration error (rc -22)
# 

It would be better to skip such unplaceable probes (and emit a warning)
and run the rest of the script.  Or else, we may opt to skip these probes
by encoding the _stext <= PTR < _etext condition from the kernel_text_address()
test into the translator.

-- 
           Summary: tolerate failed kprobe_register calls
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=6749

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