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Date:   Sun, 24 Mar 2019 11:30:41 -0400
From:   "Alex Xu (Hello71)" <>
Cc:     Vineeth Remanan Pillai <>,
        Kelley Nielsen <>,
        Huang Ying <>,
        Hugh Dickins <>,
        Rik van Riel <>,
        Andrew Morton <>
Subject: shmem_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.


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