The branch main has been updated by mjg:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=21d29c51922141ff26a4d0e47efe6b551eb03e0e

commit 21d29c51922141ff26a4d0e47efe6b551eb03e0e
Author:     Mateusz Guzik <[email protected]>
AuthorDate: 2023-03-22 21:44:55 +0000
Commit:     Mateusz Guzik <[email protected]>
CommitDate: 2023-03-29 05:02:04 +0000

    cred: make the refcount signed
    
    There are asserts on the count being > 0, but they are less useful than
    they can be because the type itself is unsigned.
    
    The kernel is compiled with -frapv, making wraparound perfectly defined.
    
    Differential Revision:  https://reviews.freebsd.org/D39220
---
 sys/sys/ucred.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/sys/ucred.h b/sys/sys/ucred.h
index 6a9becb54c75..5ec54be70c2e 100644
--- a/sys/sys/ucred.h
+++ b/sys/sys/ucred.h
@@ -61,7 +61,7 @@ struct loginclass;
 #if defined(_KERNEL) || defined(_WANT_UCRED)
 struct ucred {
        struct mtx cr_mtx;
-       u_int   cr_ref;                 /* (c) reference count */
+       int     cr_ref;                 /* (c) reference count */
        u_int   cr_users;               /* (c) proc + thread using this cred */
        struct auditinfo_addr   cr_audit;       /* Audit properties. */
 #define        cr_startcopy cr_uid

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