[Bug dyninst/17359] systemtap in dyninst mode fails to hit PLT probes

jistone at redhat dot com sourceware-bugzilla@sourceware.org
Wed Sep 16 22:20:00 GMT 2015


https://sourceware.org/bugzilla/show_bug.cgi?id=17359

Josh Stone <jistone at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |jistone at redhat dot com

--- Comment #1 from Josh Stone <jistone at redhat dot com> ---
Yes, I'm not surprised.  Dyninst does instruction-level analysis to determine
how to safely relocate code for instrumentation.  But indirect jumps are opaque
control flow to this analysis, and usually Dyninst just decides it's unsafe to
proceed.  In theory it would be fine, since we do know this is well-behaved, so
perhaps Dyninst could learn a heuristic to identify and allow PLT
instrumentation.

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