Hi, On Fri, Jul 16, 2021 at 12:07 AM Roman Gushchin <guro@xxxxxx> wrote: > > On Thu, Jul 15, 2021 at 06:10:22PM +0800, Murphy Zhou wrote: > > Hi, > > > > #Looping generic/270 of xfstests[1] on pmem ramdisk with > > mount option: -o dax=always > > mkfs.xfs option: -f -b size=4096 -m reflink=0 > > can hit this panic now. > > > > #It's not reproducible on ext4. > > #It's not reproducible without dax=always. > > Hi Murphy! > > Thank you for the report! > > Can you, please, check if the following patch fixes the problem? No. Still the same panic. > > Thank you! > > -- > > diff --git a/mm/backing-dev.c b/mm/backing-dev.c > index 271f2ca862c8..f5561ea7d90a 100644 > --- a/mm/backing-dev.c > +++ b/mm/backing-dev.c > @@ -398,12 +398,12 @@ static void cgwb_release_workfn(struct work_struct *work) > blkcg_unpin_online(blkcg); > > fprop_local_destroy_percpu(&wb->memcg_completions); > - percpu_ref_exit(&wb->refcnt); > > spin_lock_irq(&cgwb_lock); > list_del(&wb->offline_node); > spin_unlock_irq(&cgwb_lock); > > + percpu_ref_exit(&wb->refcnt); > wb_exit(wb); > WARN_ON_ONCE(!list_empty(&wb->b_attached)); > kfree_rcu(wb, rcu);
