https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230846
Bug ID: 230846
Summary: dtrace FBT doesn't know about ifuncs
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: ma...@freebsd.org
FBT creates entry/return probes for functions which have a corresponding ELF
symbol. For e.g., copyout(), we'll get fbt::copyout{,_smap,_nosmap}:entry.
Now users need to know which one to select. In particular, fbt::copyout:entry
never fires now.
I think FBT should be made to treat STT_GNU_IFUNC symbols specially: when
enabling a probe on such a function, invoke the resolver to find the true
address, and put a probe there instead.
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