gpg waiting for lock (held xxx probably dead)

I have the same problem as bug #42199 but in my system this only happens with attached mails.

I detected this problem while trying to use dpkg-source -x *.dsc and this make it freeze, because dpkg-source is a perl script i can't gdb it so i tired strace:

_llseek(3, 0, 0xbffa2320, SEEK_CUR) = -1 ESPIPE (Illegal seek)
read(3, "gpg: Signature made Tue 18 Sep 2"..., 4096) = 79
read(3, "gpg: ", 4096) = 5
read(3, "checking the trustdb\n", 4096) = 21
read(3, "gpg: ", 4096) = 5
read(3, "waiting for lock (held by 12286 "..., 4096) = 53
read(3, "gpg: ", 4096) = 5
read(3, "waiting for lock (held by 12286 "..., 4096) = 53
read(3, "gpg: ", 4096) = 5
read(3, "waiting for lock (held by 12286 "..., 4096) = 53

And so on, and

pmf@oblivion:~/Desktop$ gpg --list-keys
gpg: checking the trustdb
gpg: waiting for lock (held by 12286 - probably dead) ...
gpg: waiting for lock (held by 12286 - probably dead) ...
gpg: waiting for lock (held by 12286 - probably dead) ...
gpg: waiting for lock (held by 12286 - probably dead) ...

I