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Subject: [Bug 224479] kernel panic in reboot+swapoff sys call
Date: Thu, 11 Jan 2018 21:53:56 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224479

--- Comment #30 from Conrad Meyer <cem@freebsd.org> ---
(In reply to ota from comment #29)
Why is this line changed?  It seems gratuitous:

> static TAILQ_HEAD(swdevt_head, swdevt) swtailq =3D TAILQ_HEAD_INITIALIZER=
(swtailq);

Second: Can swapoff_all be moved much later?  Possibly just before
vfs_unmountall()?

My hunch is that syncing / flushing buffers may free up enough memory to
disable swap, if we were in an impossible-to-swapoff scenario before.  I ma=
y be
missing something, though.

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