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> What testing did you do of this?  I have this crash in today's testing:

My test is this: 
1.Configure zram for swap.
2.Run some program malloc and access large memory, make sure they
can cause swap.
3.Watch count_shadow_nodes() and shadow_lru_isolate() to make sure
that shadow_nodes are really shrinking by adding printk().

Really sorry for inadequate test, I will try more tests include drop_caches
by sysctl.