linux-kernel - shmem_recalc_inode: unable to handle kernel NULL pointer dereference

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Message-Id: <1553440122.7s759munpm.astroid@alex-desktop.none>
Date:   Sun, 24 Mar 2019 11:30:41 -0400
From:   "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Vineeth Remanan Pillai <vpillai@...italocean.com>,
        Kelley Nielsen <kelleynnn@...il.com>,
        Huang Ying <ying.huang@...el.com>,
        Hugh Dickins <hughd@...gle.com>,
        Rik van Riel <riel@...riel.com>,
        Andrew Morton <akpm@...ux-foundation.org>
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.

Thanks,
Alex.