On Tue, 8 Mar 2022 10:07:09 -0800 Minchan Kim <minchan@xxxxxxxxxx> wrote: > Check lru_cache_disabled under bh_lru_lock. Otherwise, it could > introduce race below and it fails to migrate pages containing > buffer_head. > > CPU 0 CPU 1 > > bh_lru_install > lru_cache_disable > lru_cache_disabled = false > atomic_inc(&lru_disable_count); > invalidate_bh_lrus_cpu of CPU 0 > bh_lru_lock > __invalidate_bh_lrus > bh_lru_unlock > bh_lru_lock > install the bh > bh_lru_unlock What are the user-visible runtime effects of this bug? Is a cc:stable needed? Should there be a reported-by? Thanks.
