panic: dqflush: stray dquot on FreeBSD 5.4 - quota problem

/*
* Flush all entries from the cache for a particular vnode.
*/
void
dqflush(vp)
struct vnode *vp;
{
struct dquot *dq, *nextdq;
struct dqhash *dqh;

/*
* Move all dquot's that used to refer to this quota
* file off their hash chains (they will eventually
* fall off the head of the free list and be re-used).
*/
for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) {
for (dq = dqh->lh_first; dq; dq = nextdq) {
nextdq = dq->dq_hash.le_next;
if (dq->dq_ump->um_quotas[dq->dq_type] != vp)
continue;
if (dq->dq_cnt)
panic("dqflush: stray dquot");
LIST_REMOVE(dq, dq_hash);
dq->dq_ump = (struct ufsmount *)0;
}
}
}