Thanks Guido for the log.
Now, I managed to replicate the problem.
I created /tmp/0xDF6D76C44D696F6B from debian-keyring. The key is expired.
And then, I get the key from keyserver.
Now, we have two keyrings. In this situation, it hits bug_at.
==========================
$ /usr/bin/gpg --no-default-keyring --keyring /tmp/k.gpg --recv-key
1A6F3E639A4467E8C3476525DF6D76C44D696F6B
gpg: keybox '/tmp/k.gpg' created
key DF6D76C44D696F6B:
39 signatures not checked due to missing keys
gpg: key DF6D76C44D696F6B: public key "Sven Bartscher
<sven.bartsc...@weltraumschlangen.de>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1
$ /usr/bin/gpg --no-default-keyring --keyring /tmp/k.gpg --list-key
/tmp/k.gpg
----------
pub rsa4096 2014-08-15 [SC] [expires: 2018-06-08]
1A6F3E639A4467E8C3476525DF6D76C44D696F6B
uid [ unknown] Sven Bartscher <sven.bartsc...@weltraumschlangen.de>
uid [ unknown] Sven Bartscher <kritzef...@gmail.com>
uid [ unknown] Sven Bartscher <kritzef...@debian.org>
uid [ unknown] Sven Bartscher <sven.bartsc...@credativ.de>
sub rsa4096 2014-08-15 [E]
sub rsa4096 2016-06-14 [S]
$ /usr/bin/gpg --no-default-keyring --keyring /tmp/0xDF6D76C44D696F6B --keyring
/tmp/k.gpg --list-key
/tmp/0xDF6D76C44D696F6B
-----------------------
pub rsa4096 2014-08-15 [SC] [expired: 2017-06-03]
1A6F3E639A4467E8C3476525DF6D76C44D696F6B
uid [ expired] Sven Bartscher <sven.bartsc...@weltraumschlangen.de>
uid [ expired] Sven Bartscher <svenbartsc...@yahoo.de>
uid [ expired] Sven Bartscher <kritzef...@debian.org>
/tmp/k.gpg
----------
pub rsa4096 2014-08-15 [SC] [expires: 2018-06-08]
1A6F3E639A4467E8C3476525DF6D76C44D696F6B
uid [ unknown] Sven Bartscher <sven.bartsc...@weltraumschlangen.de>
uid [ unknown] Sven Bartscher <kritzef...@gmail.com>
uid [ unknown] Sven Bartscher <kritzef...@debian.org>
uid [ unknown] Sven Bartscher <sven.bartsc...@credativ.de>
sub rsa4096 2014-08-15 [E]
sub rsa4096 2016-06-14 [S]
$ /usr/bin/gpg --no-default-keyring --keyring /tmp/0xDF6D76C44D696F6B --keyring
/tmp/k.gpg --debug=8192 --encrypt --armor --always-trust -r
1A6F3E639A4467E8C3476525DF6D76C44D696F6B
gpg: enabled debug flags: lookup
gpg: DBG: keydb_search: 1 search descriptions:
gpg: DBG: keydb_search 0: FPR20: '1A6F 3E63 9A44 67E8 C347 6525 DF6D 76C4
4D69 6F6B'
gpg: DBG: keydb_search: searching keyring (resource 0 of 2)
gpg: DBG: keyring_search: need_uid = 0; need_words = 0; need_keyid = 0;
need_fpr = 1; any_skip = 0
gpg: DBG: keyring_search: initializing offset table. (need_keyid: 0 => 1)
gpg: DBG: keyring_search: searching from start of resource.
gpg: DBG: keyring_search: packet starting at offset 0 matched descriptor 0
gpg: DBG: keyring_search: returning success
gpg: DBG: keydb_search: searched keyring (resource 0 of 2) => Success
gpg: DBG: finish_lookup: checking key 4D696F6B (all)(req_usage=2)
gpg: DBG: checking subkey ED764C3A
gpg: DBG: subkey has expired
gpg: DBG: checking subkey 217028C2
gpg: DBG: usage does not match: want=2 have=1
gpg: DBG: no suitable subkeys found - trying primary
gpg: DBG: primary key usage does not match: want=2 have=5
gpg: DBG: no suitable key found - giving up
gpg: DBG: keydb_search: 1 search descriptions:
gpg: DBG: keydb_search 0: FPR20: '1A6F 3E63 9A44 67E8 C347 6525 DF6D 76C4
4D69 6F6B'
gpg: DBG: keydb_search: searching keyring (resource 0 of 2)
gpg: DBG: keyring_search: need_uid = 0; need_words = 0; need_keyid = 0;
need_fpr = 1; any_skip = 0
gpg: DBG: keyring_search: initializing offset table. (need_keyid: 0 => 1)
gpg: DBG: keyring_search: not searching from start of resource.
gpg: DBG: keyring_search: no matches (EOF)
gpg: DBG: keydb_search: searched keyring (resource 0 of 2) => EOF
gpg: DBG: keydb_search: searching keybox (resource 1 of 2)
gpg: DBG: keydb_search: searched keybox (resource 1 of 2) => Success
gpg: DBG: finish_lookup: checking key 4D696F6B (all)(req_usage=2)
gpg: DBG: checking subkey ED764C3A
gpg: DBG: subkey might be fine
gpg: DBG: checking subkey 217028C2
gpg: DBG: usage does not match: want=2 have=1
gpg: DBG: using key ED764C3A
gpg: DBG: keydb_search: 1 search descriptions:
gpg: DBG: keydb_search 0: LONG_KID: 'DF6D76C44D696F6B'
gpg: DBG: keydb_search: searching keyring (resource 0 of 2)
gpg: DBG: keyring_search: need_uid = 0; need_words = 0; need_keyid = 1;
need_fpr = 0; any_skip = 0
gpg: DBG: keyring_search: initializing offset table. (need_keyid: 1 => 1)
gpg: DBG: keyring_search: searching from start of resource.
gpg: DBG: keyring_search: packet starting at offset 0 matched descriptor 0
gpg: DBG: keyring_search: returning success
gpg: DBG: keydb_search: searched keyring (resource 0 of 2) => Success
gpg: DBG: finish_lookup: checking key 4D696F6B (one)(req_usage=0)
gpg: DBG: using key 4D696F6B
gpg: Ohhhh jeeee: ... this is a bug (../../g10/pkclist.c:417:do_we_trust)
Aborted
$
--
