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Date:   Sun, 24 Mar 2019 11:30:41 -0400
From:   "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
Subject: shmem_recalc_inode: unable to handle kernel NULL pointer dereference
To:     linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc:     Vineeth Remanan Pillai <vpillai@digitalocean.com>,
        Kelley Nielsen <kelleynnn@gmail.com>,
        Huang Ying <ying.huang@intel.com>,
        Hugh Dickins <hughd@google.com>,
        Rik van Riel <riel@surriel.com>,
        Andrew Morton <akpm@linux-foundation.org>
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I get this BUG in 5.1-rc1 sometimes when powering off the machine. I=20
suspect my setup erroneously executes two swapoff+cryptsetup close=20
operations simultaneously, so a race condition is triggered.

I am using a single swap on a plain dm-crypt device on a MBR partition=20
on a SATA drive.

I think the problem is probably related to=20
b56a2d8af9147a4efe4011b60d93779c0461ca97, so CCing the related people.

Thanks,
Alex.