git: 3f10e5985044 - main - ip6: Add explicit lock order information to catch LOR

The branch main has been updated by jtl:

URL: https://cgit.FreeBSD.org/src/commit/?id=3f10e5985044001a68761995474f1100aca648e1

commit 3f10e5985044001a68761995474f1100aca648e1
Author:     Jonathan T. Looney <jtl@FreeBSD.org>
AuthorDate: 2025-12-05 17:34:31 +0000
Commit:     Jonathan T. Looney <jtl@FreeBSD.org>
CommitDate: 2025-12-06 19:58:46 +0000

    ip6: Add explicit lock order information to catch LOR
    
    Over the past several years, we have had sporadic reports of a lock
    order reversal between the tcphash lock and the in6_ifaddr_lock.
    These seems to be hard to reproduce reliably, and the WITNESS backtrace
    points to code which uses the correct locking order.
    
    This commit adds the correct lock order explicitly to help us detect
    the call stack which uses the incorrect locking order.
    
    PR:             289184
    Reported by:    bz, gbe
    Reviewed by:    bz, glebius
    Differential Revision:  https://reviews.freebsd.org/D54088
---
 sys/kern/subr_witness.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sys/kern/subr_witness.c b/sys/kern/subr_witness.c
index c937f6a82757..abed76315c34 100644
--- a/sys/kern/subr_witness.c
+++ b/sys/kern/subr_witness.c
@@ -566,6 +566,12 @@ static struct witness_order_list_entry order_lists[] = {
 	{ "tcp", &lock_class_mtx_sleep },
 	{ "so_snd", &lock_class_mtx_sleep },
 	{ NULL, NULL },
+	/*
+	 * IPv6 Addr
+	 */
+	{ "tcphash", &lock_class_mtx_sleep },
+	{ "in6_ifaddr_lock", &lock_class_rm },
+	{ NULL, NULL },
 	/*
 	 * BPF
 	 */