[Bug runtime/5051] backtrace() in return probes are failed on ia64

[jkenisto at us dot ibm dot com]

------- Additional Comments From jkenisto at us dot ibm dot com  2007-09-20 21:51 -------
I can't say for sure whether there's an ia64-specific problem here.  But the
fact that kretprobes messes up stack backtraces is documented.  Search for
"stack backtraces" in Documentation/kprobes.txt.

This limitation could be fixed, or at least mitigated, by adding a function to
kprobes that returns the return address from the Nth kretprobe_instance for the
indicated task in that task's bucket in kretprobe_inst_table[].  (Keep in mind
that if you have multiple kretprobes on the same function, only one of the
kretprobe_instances will have the true return address; the others will have the
kretprobe trampoline address.)

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http://sourceware.org/bugzilla/show_bug.cgi?id=5051

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