D41158.diff
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	diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
	--- a/sys/kern/vfs_vnops.c
	+++ b/sys/kern/vfs_vnops.c
	@@ -1443,6 +1443,7 @@
	void *rl_cookie;
	struct vn_io_fault_args args;
	int error;
	+ bool rl_locked;

	doio = uio->uio_rw == UIO_READ ? vn_read : vn_write;
	vp = fp->f_vnode;
	@@ -1465,12 +1466,7 @@
	}

	foffset_lock_uio(fp, uio, flags);
	- if (do_vn_io_fault(vp, uio)) {
	- args.kind = VN_IO_FAULT_FOP;
	- args.args.fop_args.fp = fp;
	- args.args.fop_args.doio = doio;
	- args.cred = active_cred;
	- args.flags = flags \| FOF_OFFSET;
	+ if (vp->v_type == VREG) {
	if (uio->uio_rw == UIO_READ) {
	rl_cookie = vn_rangelock_rlock(vp, uio->uio_offset,
	uio->uio_offset + uio->uio_resid);
	@@ -1482,11 +1478,22 @@
	rl_cookie = vn_rangelock_wlock(vp, uio->uio_offset,
	uio->uio_offset + uio->uio_resid);
	}
	+ rl_locked = true;
	+ } else {
	+ rl_locked = false;
	+ }
	+ if (do_vn_io_fault(vp, uio)) {
	+ args.kind = VN_IO_FAULT_FOP;
	+ args.args.fop_args.fp = fp;
	+ args.args.fop_args.doio = doio;
	+ args.cred = active_cred;
	+ args.flags = flags \| FOF_OFFSET;
	error = vn_io_fault1(vp, uio, &args, td);
	- vn_rangelock_unlock(vp, rl_cookie);
	} else {
	error = doio(fp, uio, active_cred, flags \| FOF_OFFSET, td);
	}
	+ if (rl_locked)
	+ vn_rangelock_unlock(vp, rl_cookie);
	foffset_unlock_uio(fp, uio, flags);
	return (error);
	}