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[Bug uprobes/12275] uretprobes break exception handling
- From: "jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Wed, 24 Jun 2015 20:30:39 +0000
- Subject: [Bug uprobes/12275] uretprobes break exception handling
- Auto-submitted: auto-generated
- References: <bug-12275-6586 at http dot sourceware dot org/bugzilla/>
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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