[Bug uprobes/12275] uretprobes break exception handling

[jistone at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=12275

--- Comment #16 from Josh Stone <jistone at redhat dot com> ---
I just realized the obvious fact that this is really breaking *all* unwinding,
not just exceptions.  So print_ubacktrace() will end at the uretprobe
trampoline, and _caller_match() used by .callee probes will be disrupted too.

Perhaps those cases could poke around in kernel memory to find the true return
address.  The old utrace-based uprobes.ko had uprobe_get_pc(), and
runtime/stack.c conditionally uses this, but I think even that only worked for
the first unwind level.

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