Recently I rearranged partitions on an SSD. The swap partition was
eliminated in favor of a swap file on /usr. This works, allows TRIM
support on the swap space, and is easier to resize than a partition.
However, sometimes the system panics on shutdown. It happens after
"syncing disks", so the filesystems are fine, but it's disconcerting.
I suspect but haven't yet managed to prove that it's only when swap is
not empty. A race condition involving when the filesystems are
unmounted? Or should there be some code in /etc/rc.d/addswap to run
swapoff before shutdown?
This is on a very recent 9-STABLE amd64, i5 2500K.
rc.conf:
swapfile="/usr/swap/swap"
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