[Bug 1979869] Re: scdaemon timeout (suspected IPC bug): guru logs included

[Brett Holman]

Last weekend I installed a different distro[1] on an old laptop to
compare, and this bug doesn't exist there. Looks like this probably a
software bug is specific to Ubuntu. I'm happy to gather any other
requested information in the near future to help with resolving this
bug, but since I've "solved my problem", so to say, I guess I don't care
as much any more.

[1] Gentoo: it looks like 2.2.35-r1 is the version, and it only has 2
tiny patches, in case this helps:
https://github.com/gentoo/gentoo/blob/master/app-
crypt/gnupg/gnupg-2.2.35-r1.ebuild

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Title:
  scdaemon timeout (suspected IPC bug): guru logs included

Status in gnupg2 package in Ubuntu:
  New

Bug description:
  Resetting my (YubiKey 5 NFC) PIN stopped working. I believe I was on
  Impish (now Jammy) when I last reset it. Based on the scdaemon logs it
  looks like my initial admin PIN is received and scdaemon makes a
  second INQUIRE NEEDPIN request for the updated password. However,
  scdaemon never receives a response to the second request.

  $ export GPG_TTY=$(tty)
  $ echo $GPG_TTY
  /dev/pts/8
  $ tty
  /dev/pts/8
  $ gpg --edit-c

  Application type .: OpenPGP
  PIN retry counter : 0 0 3
  <snip>
  gpg/card> passwd
  gpg: OpenPGP card no. <snip> detected
  Enter passphrase:                       <- hangs indefinitely

  I enabled scdaemon logging in guru mode and here are the bits that
  look relevant to me (the last 8 lines):

  2022-06-24 20:15:24 scdaemon[305860] DBG: chan_14 -> OK
  2022-06-24 20:15:24 scdaemon[305860] DBG: chan_14 <- PASSWD  1
  2022-06-24 20:15:24 scdaemon[305860] DBG: asking for PIN '||Please enter the PIN'
  2022-06-24 20:15:24 scdaemon[305860] DBG: chan_14 -> INQUIRE NEEDPIN ||Please enter the PIN
  2022-06-24 20:15:29 scdaemon[305860] DBG: chan_14 <- [ <snip> ...(<snip> byte(s) skipped) ]
  2022-06-24 20:15:29 scdaemon[305860] DBG: chan_14 <- END
  2022-06-24 20:15:29 scdaemon[305860] DBG: asking for PIN '|N|New PIN'
  2022-06-24 20:15:29 scdaemon[305860] DBG: chan_14 -> INQUIRE NEEDPIN |N|New PIN


  To me it looks like whatever is on the other end of chan_14 never
  received the message, because the prompt "Enter passphrase:" is never
  updated (I think it's supposed to say "Enter new passphrase" or
  similar after the second INQUIRE NEEDPIN is sent from scdaemon).

  Please let me know if further information is needed. I can share more
  logs if required and potentially test a fix (depending on the
  timeline).

  Obligatory:
  ----------

  Description:	Ubuntu 22.04 LTS
  Release:	22.04

  ii  gpg-agent      2.2.27-3ubuntu2 amd64        GNU privacy guard - cryptographic agent
  ii  scdaemon       2.2.27-3ubuntu2 amd64        GNU privacy guard - smart card support

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