[pkg-cryptsetup-devel] Bug#918008: cryptsetup-run: busy on shutdown for root (on lvm) on crypt

[Thorsten Glaser]

Package: cryptsetup-run
Severity: minor

We’ve got the same problem as https://superuser.com/q/1343150/255031
and https://www.linuxquestions.org/questions/debian-26/shutdown-hangs-at-stopping-remaining-crypto-disks-busy-4175548975/

On shutting down a system whose root filesystem lives on crypto,
here indirectly via LVM, the shutdown process displays something like:

Stopping remaining crypto disks...sda5_crypt (busy)... sda5_crypt busy…

This takes a while (about a minute or so), then the shutdown continues.

The cause is trivial: the root filesystem is still live, so the crypto
disc cannot be deconfigured.

Is there a way to tell cryptsetup to not warn about a busy device if
the root filesystem resides on it, for example via a crypttab option?
I only found options like noauto that do the exact contrary. Perhaps
introducing a new option hasrootfs or something may be useful?

Thanks in advance,
//mirabilos
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