found 774153 215-17+deb8u5 tags 774153 - moreinfo retitle 774153 systemd-tty-ask-password hangs udev postinst until daemon-reexec is run thanks
A friend of mine hit this bug, and it presented in a pretty nasty way. Some details: The system was running Jessie, and upgraded from Wheezy when Jessie came out. The system was restarted 8 days ago, and had this issue present itself when systemd/udev was updated. The system was running 215-17+deb8u4 before installing 215-17+deb8u5. In udev's postinst, it asks for a udev stop, which winds up hanging because systemctl is asking systemd-tty-ask-password-agent for something. This causes dpkg to hang because the postinst hangs. This wound up causing a bit of a headache in an (routine!) stable upgrade, and this caused a friend bunch of lost time to strace trying to track this one down. After a bit of digging, I came accross this bug which sounded similar enough that I tried a `systemctl daemon-reexec`. This wound up fixing udev from blocking, and let my friend finish the system upgrade. I'm not totally sure what's going on here since this is a Jessie -> Jessie upgrade, and the version went from 215-17+deb8u4 -> 215-17+deb8u5, which makes mismatches in systemctl and the running systemd a bit suspect in my mind (same upstream version, right?) As such, I've retitled the bug according to my latest understanding of this problem. I've also removed the moreinfo tag. I've attached an strace of the stop that was sent to me, I've CC'd weaver as well. Happy to provide more thoughts, but I don't know how to reproduce this, so I tried to dump as much as I know about the failure mode. FWIW, this seems like it is still a bug that impacts stable -- I don't want to play severity ping-pong, but bumping this above normal might be worth it. <3, paultag
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