The branch stable/13 has been updated by kib:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=9b392d07381e6129a1f5e6280ed5b603a3b4d3db

commit 9b392d07381e6129a1f5e6280ed5b603a3b4d3db
Author:     Konstantin Belousov <[email protected]>
AuthorDate: 2021-05-07 22:13:29 +0000
Commit:     Konstantin Belousov <[email protected]>
CommitDate: 2021-11-01 00:44:51 +0000

    sysctl vm.objects: yield if hog
    
    (cherry picked from commit 350fc36b4cf896cbfce657a6dab600b26367a34a)
---
 sys/vm/vm_object.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
index 9462e8753afb..5bbe7faed50b 100644
--- a/sys/vm/vm_object.c
+++ b/sys/vm/vm_object.c
@@ -2585,6 +2585,7 @@ vm_object_list_handler(struct sysctl_req *req, bool 
swap_only)
                kvo->kvo_structsize = roundup(kvo->kvo_structsize,
                    sizeof(uint64_t));
                error = SYSCTL_OUT(req, kvo, kvo->kvo_structsize);
+               maybe_yield();
                mtx_lock(&vm_object_list_mtx);
                if (error)
                        break;

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