Interesting, thanks for your investigation!
As a note, it's easier to disable this by moving away
/lib/udev/rules.d/85-hdparm.rules .
If you move that away and reboot, can you reproduce the hang with
sudo DEVNAME=/dev/sdb sh -x /lib/udev/hdparm 2>/tmp/hdparm.log
? (Assuming that /dev/sdb is the USB device which it hangs on). If so,
please press Control-C and attach /tmp/hdparm.log here.
** Changed in: udev
Status: Incomplete => Invalid
** Package changed: devicekit-disks (Ubuntu) => hdparm (Ubuntu)
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New inserted USB device is not recognized if a copy job is active in other USB
device (device = USB HDD, USB stick)
https://bugs.launchpad.net/bugs/482448
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