On 2023/05/12 21:54, Thomas Gleixner wrote: > On Fri, May 12 2023 at 19:57, Tetsuo Handa wrote: >> On 2023/05/12 12:44, Andrew Morton wrote: >>> On Thu, 11 May 2023 22:47:32 +0900 Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote: >>> >>>> syzbot is reporting lockdep warning in fill_pool(), for GFP_ATOMIC is >>>> (__GFP_HIGH | __GFP_KSWAPD_RECLAIM) which wakes up kswapd. >>>> Since fill_pool() might be called with arbitrary locks held, >>>> fill_pool() should not assume that holding pgdat->kswapd_wait is safe. > > https://lore.kernel.org/lkml/871qjldbes.ffs@tglx/ .config says IS_ENABLED(CONFIG_PREEMPT_RT) == false, and lockdep says about base->lock => pgdat->kswapd_wait => p->pi_lock => rq->__lock => base->lock dependency but does not say about db->lock. How can your patch fix this problem?
