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I've got a luks volume setup and mounted, and when not in use I suspend it with cryptsetup luksSuspend so it cannot be accessed. But if I forget it's suspended and try to do any kind of file access in the mounted directory, the process just hangs, instead of failing immediately. CTRl-C doesn't work to kill it, and CTRL-Z doesn't work to put it in the background. Even sudo kill -9 doesn't help.

Is there a way to make these commands fail fast when the volume is suspended?

If it's relevant, the volume is setup on a loop device backed by a file.

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Suspending all accesses until the passphrase is entered again is the whole point of luksSuspend. If you want to ensure that the encrypted device is not in use, call luksClose.

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