Just updating pinentry to 0.9.3 (SR#310364) which has a new
/usr/bin/pinentry-gnome3 command.

I noticed this:

> $ /usr/bin/pinentry-gnome3
> OK Your orders please
> getpin
> couldn't lock 16384 bytes of memory (libgcrypt): Cannot allocate memory
> ERR 83886179 canceled

mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7efc75498000
mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7efc75494000
mlock(0x7efc75494000, 16384)            = -1 ENOMEM (Cannot allocate memory)
write(2, "couldn't lock 16384 bytes of mem"..., 72couldn't lock 16384 bytes of
memory (libgcrypt): Cannot allocate memory
) = 72

So this is probably similar to bug 915931.