The branch main has been updated by kib:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=1de1e2bfbf3c089418bbe67c096d60315c8ca5dd

commit 1de1e2bfbf3c089418bbe67c096d60315c8ca5dd
Author:     Konstantin Belousov <[email protected]>
AuthorDate: 2021-01-23 21:50:55 +0000
Commit:     Konstantin Belousov <[email protected]>
CommitDate: 2021-02-12 01:02:20 +0000

    ffs_syncvnode: only clear IN_NEEDSYNC after successfull sync
    
    If it is cleaned before the sync, other threads might see the inode without
    the flag set, because syncing could unlock it.
    
    Reviewed by:    chs, mckusick
    Tested by:      pho
    MFC after:      2 weeks
    Sponsored by:   The FreeBSD Foundation
---
 sys/ufs/ffs/ffs_vnops.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/ufs/ffs/ffs_vnops.c b/sys/ufs/ffs/ffs_vnops.c
index 68985d8715f3..be2653e32adc 100644
--- a/sys/ufs/ffs/ffs_vnops.c
+++ b/sys/ufs/ffs/ffs_vnops.c
@@ -257,7 +257,6 @@ ffs_syncvnode(struct vnode *vp, int waitfor, int flags)
        bool still_dirty, unlocked, wait;
 
        ip = VTOI(vp);
-       ip->i_flag &= ~IN_NEEDSYNC;
        bo = &vp->v_bufobj;
        ump = VFSTOUFS(vp->v_mount);
 
@@ -445,6 +444,8 @@ next:
        }
        if (error == 0 && unlocked)
                error = ERELOOKUP;
+       if (error == 0)
+               ip->i_flag &= ~IN_NEEDSYNC;
        return (error);
 }
 
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