The branch stable/13 has been updated by markj:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=7c27fee0ea1690445b98e29c12c8939983257c84

commit 7c27fee0ea1690445b98e29c12c8939983257c84
Author:     Mark Johnston <[email protected]>
AuthorDate: 2022-03-01 20:08:25 +0000
Commit:     Mark Johnston <[email protected]>
CommitDate: 2022-03-15 15:40:22 +0000

    proc: Remove assertion that P_WEXIT is not set in proc_rwmem()
    
    exit1() sets P_WEXIT before waiting for holding threads to finish,
    rather than after, so this assertion is racy.
    
    Fixes:  12fb39ec3e6b ("proc: Relax proc_rwmem()'s assertion on the process 
hold count")
    Reported by:    Jenkins
    
    (cherry picked from commit 879b0604a8940f575f03bde5457bcf13e64c1ae8)
---
 sys/kern/sys_process.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c
index 273adca19a0d..267ffc3d8d50 100644
--- a/sys/kern/sys_process.c
+++ b/sys/kern/sys_process.c
@@ -219,8 +219,6 @@ proc_rwmem(struct proc *p, struct uio *uio)
         */
        if (p != curproc)
                PROC_ASSERT_HELD(p);
-       KASSERT((p->p_flag & P_WEXIT) == 0,
-           ("%s: process %p is exiting", __func__, p));
        PROC_LOCK_ASSERT(p, MA_NOTOWNED);
 
        /*

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