[Bug 272184] if_lagg_test reversals also triggered on amd64, kernel 1400092

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 24 Jun 2023 15:20:53 UTC

            Bug ID: 272184
           Summary: if_lagg_test reversals also triggered on amd64, kernel
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: noahkeck72@gmail.com

Created attachment 242966
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=242966&action=edit
Concatenated root-priv and user-priv kyua reports

Like in bug #244163, amd64 hardware also triggers lock-order reversals in
1400092. My build is a fresh build from git commit id 59833b089e78 ("arm64:
improve KTR_TRAP trace entries", 2023-06-24). This is likely a race condition,
and I've replicated the failure both on bare metal and VM. The full
concatenated log of a root- and user-privileged kyua run is attached, and the
relevant failure is printed below.

sys/net/if_lagg_test:witness  ->  failed: Lock-order reversals involving
if_lagg.c detected  [0.078s]

The system's behavior doesn't seem too affected by this (as of two hours'
uptime in this build), but I figured it's better to report than stay quiet.

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