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I managed to create (artificial) reproducible case where scdaemon hangs up. I have a Gnuk Token inserted, and insert/remove Yubikey for this experiment. (1) first terminal ``` $ gpg --card-edit ... gpg/card> ``` This is needed, for another terminal can do `DEVINFO --watch` for scdaemon by socket connection. (2) second terminal Invoke `DEVINFO --watch` but not consuming its output, by stopping `Ctrl-Z` ``` $ gpg-connect-agent > SCD DEVINFO --watch ... ^Z ``` (3) third terminal Observing card statuses. ``` $ while sleep 0.5; do gpg --card-status all; done ``` And inserting/removing a Yubikey many times. Eventually (for my case, 45 times of inserting/removing), the `gpg` process stops proceeding (because scdaemon hangs up). (4) fourth terminal After scdaemon hangs, listing secret keys hangs. ``` $ gpg -K ```

I managed to create (artificial) reproducible case where scdaemon hangs up. I have a Gnuk Token inserted, and insert/remove Yubikey for this experiment. (1) first terminal ``` $ gpg --card-edit ... gpg/card> ``` This is needed, for another terminal can do `DEVINFO --watch` for scdaemon by socket connection. (2) second terminal Invoke `DEVINFO --watch` but not consuming its output, by stopping `Ctrl-Z` ``` $ gpg-connect-agent > SCD DEVINFO --watch ... ^Z ``` (3) third terminal Observing card statuses. ``` $ while sleep 0.5; do gpg --card-status all; done ``` And inserting/removing a Yubikey many times. Eventually (for my case, 45 times of inserting/removing), the `gpg` process stops proceeding (because scdaemon hangs up). (4) fourth terminal After scdaemon hangs up, listing secret keys hangs. ``` $ gpg -K ```

I managed to create (artificial) reproducible case where scdaemon hangs up. I have a Gnuk Token inserted, and insert/remove Yubikey for this experiment. (1) first terminal ``` $ gpg --card-edit ... gpg/card> ``` This is needed, for another terminal can do `DEVINFO --watch` for scdaemon by socket connection. (2) second terminal Invoke `DEVINFO --watch` but not consuming its output, by stopping `Ctrl-Z` ``` $ gpg-connect-agent > SCD DEVINFO --watch ... ^Z ``` (3) third terminal Observing card statuses. ``` $ while sleep 0.5; do gpg --card-status all; done ``` And inserting/removing a Yubikey many times. Eventually (for my case, 45 times of inserting/removing), the `gpg` process stops proceeding (because scdaemon hangs up). (4) fourth terminal After scdaemon hangs up, listing secret keys hangs. ``` $ gpg -K ```