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Jeff Layton wrote: > On Tue, 2026-01-27 at 12:11 -0500, Chuck Lever wrote: >>> + >>> + if (work_busy(&ls->ls_fence_work.work)) >>> + return false; >>> + /* Schedule work to do the fence operation */ >>> + ret = mod_delayed_work(system_dfl_wq, &ls->ls_fence_work, 0); >>> + if (!ret) { >>> + /* >>> + * If there is no pending work, mod_delayed_work queues >>> + * new task. While fencing is in progress, a reference >>> + * count is added to the layout stateid to ensure its >>> + * validity. This reference count is released once fencing >>> + * has been completed. >>> + */ >>> + refcount_inc(&ls->ls_stid.sc_count); >>> + ++ls->ls_fence_retry_cnt; >>> + return true; >>> + } >> Incrementing after the mod_delayed_work() call is racy. Instead: >> >> refcount_inc(&ls->ls_stid.sc_count); >> ret = mod_delayed_work(system_dfl_wq, &ls->ls_fence_work, 0); >> if (ret) { >> refcount_dec(&ls->ls_stid.sc_count); >> .... >> } >> > Is that safe? That's done in nfsd_break_one_deleg() for similar > reasons, but there is a comment over that function explaining why it's > OK. > > We'll need to validate that the lease is always released before the > sc_count goes to 0 here too. At first glance, it doesn't look like that > is the case. No, it's not safe. I have to think of other ways to make sure the layout statid is valid when the fence worker runs. -Dai > >