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Subjectshmem_recalc_inode: unable to handle kernel NULL pointer dereference
I get this BUG in 5.1-rc1 sometimes when powering off the machine. I 
suspect my setup erroneously executes two swapoff+cryptsetup close
operations simultaneously, so a race condition is triggered.

I am using a single swap on a plain dm-crypt device on a MBR partition
on a SATA drive.

I think the problem is probably related to
b56a2d8af9147a4efe4011b60d93779c0461ca97, so CCing the related people.

Thanks,
Alex.

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