The branch main has been updated by mjg:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=ec12b4f4ff3817b75f4c23ee2acd14fdb0ffa20a

commit ec12b4f4ff3817b75f4c23ee2acd14fdb0ffa20a
Author:     Mateusz Guzik <[email protected]>
AuthorDate: 2022-02-14 15:33:24 +0000
Commit:     Mateusz Guzik <[email protected]>
CommitDate: 2022-02-15 17:51:08 +0000

    fd: add missing seqc to dupfdopen
---
 sys/kern/kern_descrip.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c
index e7b3191bae30..57e0d9dee671 100644
--- a/sys/kern/kern_descrip.c
+++ b/sys/kern/kern_descrip.c
@@ -3642,6 +3642,7 @@ dupfdopen(struct thread *td, struct filedesc *fdp, int 
dfd, int mode,
                newfde = &fdp->fd_ofiles[indx];
                oldfde = &fdp->fd_ofiles[dfd];
 #ifdef CAPABILITIES
+               seqc_write_begin(&oldfde->fde_seqc);
                seqc_write_begin(&newfde->fde_seqc);
 #endif
                memcpy(newfde, oldfde, fde_change_size);
@@ -3649,6 +3650,7 @@ dupfdopen(struct thread *td, struct filedesc *fdp, int 
dfd, int mode,
                fdunused(fdp, dfd);
 #ifdef CAPABILITIES
                seqc_write_end(&newfde->fde_seqc);
+               seqc_write_end(&oldfde->fde_seqc);
 #endif
                break;
        }

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