The debug traces for reference counting in ZFS use the pointer of the owning object as a "tag" for references to check that when an object drops a reference it had actually held one. In a couple of places ZFS drops references after freeing the owning object. In userland GCC realizes this is a use after free. However, since only the value of the pointer is used, and it isn't indirected, the use is harmless. Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D36818 |
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