Comment 33 for bug 1710278

first deadlock from comment 27 fixed/workedaround.

Next deadlock is:

thread A is the same as comment 27, holding view->lock and waiting for the bucket lock in dns_resolver_shutdown.

now, thread B calls dispatch->authvalidated->nsecvalidate->create_fetch->dns_resolver_createfetch->dns_resolver_createfetch3 which does:

  LOCK(&res->buckets[bucketnum].lock);

then calls fctx_create->fcount_incr which does:

  LOCK(&fctx->res->lock);

where fctx->res is the view. So again, deadlock.