[Bug 289017] [lagg] A time-of-check to time-of-use (TOCTOU) race exists in the Link Aggregation (LAGG) network subsystem

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From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 14 Dec 2025 19:48:24 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289017

--- Comment #9 from Gui-Dong Han <hanguidong02@gmail.com> ---
I believe this race condition can manifest in multiple ways depending on the
exact timing. Potential scenarios include a NULL pointer dereference within
lagg_proto_start (specifically when the protocol is LAGG_PROTO_NONE) and the
lagg_lacp_start crash shown above. These are likely just examples of many
potential failure points caused by this synchronization issue.

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