Another observation from the strace: when mkswap runs, /dev/sda3 is
already enabled again:
21626 open("/proc/swaps", O_RDONLY|O_CLOEXEC) = 4
21626 read(4, "Filename\t\t\t\tType\t\tSize\tUsed\tPriority\n/dev/sda3
partition\t8251388\t0\t-1\n", 1024)
= 100
[...]
21626 open("/dev/sda3", O_RDONLY|O_EXCL|O_CLOEXEC) = -1 EBUSY (Device or
resource busy)
There is a "dd if=/dev/sda3 of=991754715136-1000204140543/old_uuid"
running which has the device open (pid 21620), but it finishes well
before mkswap starts. I don't see anything else accessing /dev/sda3 in
the straces in between, so something from outside interferes here
(triggered by udev or similar).
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https://bugs.launchpad.net/bugs/1552539
Title:
Ubiquity Erase Disk and Install Fails to create Swap Space
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