For the record, I add the info here too (was: just in xmpp).

Fixed in 1.51, by introducing gpgrt_spawn_actions_set_env_rev, which assumes utf-8 encoding.

Fixed in 1.51.

Fixed in 1.51.

@ebo @ikloecker Let me explain my thoughts. If you have time, please help me doing some tests in your environment.

This shell script running gpg-connect-agent should run successfully:

SCD SERIALNO serialno can move the first card in the list in scdaemon.

@ikloecker Using scdaemon with multiple cards, it is a connection which holds the card.

@ikloecker Thank you sharing the problem. I don't know much aboug NKS card.

I found a problem of possible duplicate registration of another APP, due to no serialization for CARD access.

The resource leak was fixed in: rG40707c8bff49: agent: Fix resource leak for PRIMARY_CTX.

@ebo Thank you for your continuous testing.

@ikloecker : Thanks for investigating. Please note that gpg-agent is incompatible wrt LISTTRUSTED (2.2 vs 2.4). So, No data callback in IPC maybe expected with gpg-agent 2.4.

I created a branch: https://dev.gnupg.org/source/libgcrypt/history/gniibe%252Ft7340/

Thanks. Fixed in: rEd14c69a7f256: Avoid use of 'nullptr' for an identifier.

I found fd resource leak in gpg-agent.

• gpg-connect-agent "scd killscd" /bye seems not release a file descriptor somewhere

For the second case, I think that gcry_kdf_defive should not be called with pw="". The result of FAILURE gpg-exit 33554433 comes from the log_error after failure of gcry_kdf_derive.

Autoconf archive has AX_TLS: https://www.gnu.org/software/autoconf-archive/ax_tls.html
Also, AX_GCC_VAR_ATTRIBUTE(tls_model) could be used: https://www.gnu.org/software/autoconf-archive/ax_gcc_var_attribute.html

Good catch, @ikloecker !
I located the bug in GnuPG, and the fix is: rG71840b57f486: common: Fix a race condition in creating socketdir.

With the change, T7169 is fixed (by side-effect).

Pushed the change: rE1860f6407f83: spawn: Add new function to modify environment.

Replacing gpgrt_spawn_actions_set_environ by gpgrt_spawn_actions_set_envchange is not good, as it's exported and already used.

Pushed the fix for exporting OpenPGP v5 key: rG57dce1ee62c2: common,gpg,scd,sm: Fix for Curve25519 OID supporting new and old.

The OID is used for fingerprint computation, which complicates things.

Fixed in master: rGe7891225788a: gpg: Robust error handling for SCD READKEY.

Here is my attempt:

It is reproducible bug even with master branch.

I have a look at the log file of gpg-agent.log. I can see that six PKDECRYPT requests are handled simultaneously. I think that it's out of secure memory to decrypt the private key which results pinentry request.

Fixed in pinentry 1.3, when using GnuPG 2.4 or later.

Fixed in libassuan 3.0.0.

Done in GnuPG 2.5.0.

The change of spawn functions (basically, it was factored out to libgpg-error) results more possibilities to have blocked scdaemon, since the implementation in libgpg-error introduced context switch points when it spawns a child process.

Found another thinko; When there is no clients with DEVINFO --watch, the pipe to be notified is not consumed at all (no read). It eventually results blocked by write(2), when the pipe is filled.

Do you have scd-event script in your GNUPGHOME?

I applied rGb804378f183f: kbx: Fix a race condition on DATABASE_HD. in master. Let us see how behavior changes.

I found one problem. This problem may result lock-up on Windows, I suppose.

I mean: two gpg-agent requests simultaneously running DEVINFO --watch.
Single scdaemon, two threads handling DEVINFO --watch simultaneously, by pselect + read.
Two threads waken up, but it was only one thread which can read(2), another was blocked (before the fix).

For POSIX, I found an issue of T7151.
If you are using multiple clients which invoke SCD DEVINFO --watch, the problem should be fixed.
If it's not the case, let us locate a bug (or two).

Fixed in rGfc30f7059650: scd: Fix DEVINFO to allow multiple clients.

I realized that I put a bug on POSIX; When multiple clients do DEVINFO --watch, it is possible for scdaemon to hang (waiting pselect and read, read by one, read by another is blocked).