with no real world impact.

This is not a bug in 2.2, this is a bug in 2.4.

2.2. reaches EOL in 6 weeks and thus we won't look at a potential problem with no real world impact.

I suggest to make the following text changes for the VSD versions only:

after a bit more testing, it looks to me like 2.2.45 will revise the signature packet to use 0x00ed as the MPI header for r, if it receives input from 2.4.6. And 2.4.6 will revise the signature packet to use 0x0100 as the MPI header for r. So the same OpenPGP self-sig will change shape each time it is passed back and forth between the different versions.

In select_application function, we can minimize the holding W-lock.

This may requires major changes for scdaemon.

For the cancelling operation, each card reader access should have an independent resource manager context.
Currently, a single pcsc.context is shared by all reader accesses.

Hard lockup should be avoided. In particular, following conditions should meet:

• gpgconf --kill scdaemon can kill scdaemon
• KEYINFO requests can be answered for other connections of scdaemon

As of 2024-11-18, my hypothesis is:

• there are some sort of race conditions between PC/SC + card reader (or its driver) + smartcard + scdaemon on Windows, at least at initial use after boot
• because of this, SCardConnect of PC/SC call wrongly fails (somehow confirmed by @ebo's experiments + @gniibe's speculation), or wrongly never returns (@gniibe's guess, side info: its slowness is observed in T7400).

@ebo Thank you for your testing.

@ikloecker indeed we try only for 5 seconds:

I think that the card reader is not connected and there is no Scardsvr at this time.
And the card reader connection to USB port results invoking Scardsvr. Then, "SCD SERIALNO --all" gets success.

For T6567 I changed the way that Kleopatra runs "gpgconf --launch gpg-agent". This change is not yet in Eva's test build. It seems my change is not good because running "gpgconf --launch gpg-agent" timed out after 5 seconds in 3 of 3 tests starting Kleopatra after a reboot of the VM. To check if "gpgconf --launch gpg-agent" really takes that long I measured the time in PowerShell after another reboot of the VM. The result is shocking.

A bunch more improvements (for gpg4win 5.0):

Please note that a card insertion to a card reader and a card reader connection to PC are different things.
It may cause different results.

ebo: Thank you for your testing.

I found an issue in libassuan, which might be related possibly, it is described in T7399.
When the response is not consumed like the case in T7399, if repeatedly, it may fill up the buffer eventually.

Result of first iteration sorting the tickets by Features, Bug Fixes, and different reasons why they are not relevant for the release notes of 4.4.0

Noteworthy changes in Version 4.4.0 (unreleased)
------------------------------------------------

This doesn't need to be verified with VSD 3.3 after it was verified with Gpg4win.

This was fixed in gpgme and is therefore automatically in VSD 3.3

Ready for testing. Note that you also need gpgme master.