Re: encrypted swap with urandom key problem

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Best as I can tell, for some reason the failure case, systemd doesn't
see the formatted swap device appear.

In a working case it looks like this:
[   23.310555] flap.local systemd[1]:
dev-disk-by\x2duuid-dcae3053\x2d1cc2\x2d4890\x2da33b\x2d6d71b3dc97df.device:
Changed dead -> plugged
[   23.310639] flap.local systemd[1]:
dev-disk-by\x2did-dm\x2dname\x2dcryptswap.device: Changed dead ->
plugged
[   23.310681] flap.local systemd[1]: dev-mapper-cryptswap.device:
Changed dead -> plugged
[   23.310724] flap.local systemd[1]: dev-mapper-cryptswap.device: Job
165 dev-mapper-cryptswap.device/start finished, result=done
[   23.310765] flap.local systemd[1]: Found device /dev/mapper/cryptswap.
[   23.312699] flap.local systemd[1]:
dev-disk-by\x2did-dm\x2duuid\x2dCRYPT\x2dPLAIN\x2dcryptswap.device:
Changed dead -> plugged
[   23.312769] flap.local systemd[1]: dev-dm\x2d0.device: Changed dead
-> plugged
[   23.312814] flap.local systemd[1]:
sys-devices-virtual-block-dm\x2d0.device: Changed dead -> plugged
[   23.313594] flap.local systemd[1]: dev-mapper-cryptswap.swap: About
to execute: /sbin/swapon -o nofail /dev/mapper/cryptswap
[   23.314123] flap.local systemd[1]: dev-mapper-cryptswap.swap:
Forked /sbin/swapon as 710
[   23.314457] flap.local systemd[1]: dev-mapper-cryptswap.swap:
Changed dead -> activating
[   23.314565] flap.local systemd[1]: Activating swap /dev/mapper/cryptswap...
[   23.314831] flap.local systemd[710]: dev-mapper-cryptswap.swap:
Executing: /sbin/swapon -o nofail /dev/mapper/cryptswap
[   23.322581] flap.local kernel: Adding 8388604k swap on
/dev/mapper/cryptswap.  Priority:-2 extents:1 across:8388604k SSFS


However, in the failing case, that doesn't happen, and systemd hangs
indefinitely waiting for it to appear. And in the early debug shell,
'blkid' sees it. That means the kernel and libblkid see it. I've got
no idea why systemd doesn't see it.


Chris Murphy
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