Thread 1 (Thread 0x7ffff7fab700 (LWP 18761)):
#0  0x00007ffff7453fcb in _gcry_mpi_normalize (a=0x0) at mpi-bit.c:61
No locals.
#1  0x00007ffff7454031 in _gcry_mpi_get_nbits (a=0x0) at mpi-bit.c:79
        n = 0
#2  0x00007ffff736f0fe in gcry_mpi_get_nbits (a=0x0) at visibility.c:604
No locals.
#3  0x00000000004343e7 in encode_md_value (pk=0x74e310, md=0x8b2230, hash_algo=2) at seskey.c:350
        rc = 0
        asn = 0xbb66d0 "0!0\t\006\005+\016\003\002\032\005"
        asnlen = 15
        frame = 0x100000000
        mdlen = 140737488344704
        __FUNCTION__ = "encode_md_value"
#4  0x00000000004524bc in check_signature_end_simple (pk=0x74e310, sig=0x85c770, digest=0x8b2230) at sig-check.c:461
        result = 0x0
        rc = 0
        weak = 0x0
#5  0x000000000045301a in check_signature_over_key_or_uid (signer=0x74e310, sig=0x85c770, kb=0x835ac0, packet=0x8241b0, is_selfsig=0x0, ret_pk=0x0) at sig-check.c:892
        rc = 0
        pripk = 0x785aa0
        md = 0x8b2230
        signer_alloced = 0
        __FUNCTION__ = "check_signature_over_key_or_uid"
#6  0x00000000004535e8 in check_key_signature2 (root=0x835ac0, node=0x8774c0, check_pk=0x0, ret_pk=0x0, is_selfsig=0x0, r_expiredate=0x0, r_expired=0x0) at sig-check.c:1075
        unode = 0x841520
        pk = 0x785aa0
        sig = 0x85c770
        algo = 2
        rc = 0
        __FUNCTION__ = "check_key_signature2"
#7  0x0000000000452abb in check_key_signature (root=0x835ac0, node=0x8774c0, is_selfsig=0x0) at sig-check.c:686
No locals.
#8  0x0000000000432dd5 in keyring_rebuild_cache (token=0x719940, noisy=0) at keyring.c:1554
        sig = 0x85c770
        hd = 0x719a40
        desc = {mode = KEYDB_SEARCH_MODE_NEXT, skipfnc = 0x0, skipfncvalue = 0x0, sn = 0x0, snlen = 0, u = {name = 0x0, fpr = '\000' <repeats 23 times>, kid = {0, 0}, grip = '\000' <repeats 19 times>}, exact = 0}
        keyblock = 0x835ac0
        node = 0x8774c0
        lastresname = 0x719960 "/home/feandil/.gnupg/pubring.gpg"
        resname = 0x719960 "/home/feandil/.gnupg/pubring.gpg"
        tmpfp = 0x719d70
        tmpfilename = 0x719d40 "/home/feandil/.gnupg/pubring.gpg.tmp"
        bakfilename = 0x71aab0 "/home/feandil/.gnupg/pubring.gpg~"
        rc = 0
        count = 835
        sigcount = 16244
#9  0x000000000042f438 in keydb_rebuild_caches (noisy=0) at keydb.c:1775
        i = 0
        rc = 0
#10 0x00000000004947dd in validate_keys (interactive=1) at trustdb.c:1904
        rc = 0
        quit = 0
        klist = 0x0
        k = 0x182e97cf
        keys = 0x0
        kar = 0x0
        kdb = 0x0
        node = 0x1
        depth = 0
        ot_unknown = 0
        ot_undefined = 24
        ot_never = 0
        ot_marginal = 0
        ot_full = 0
        ot_ultimate = 83952387
        stored = 0x4bb7dfdce8f9a600
        used = 0x0
        full_trust = 0x4076a0 <_start>
        start_time = 1480214499
        next_expire = 0
#11 0x0000000000492228 in update_trustdb () at trustdb.c:539
No locals.
#12 0x000000000040f7c3 in main (argc=0, argv=0x7fffffffe018) at gpg.c:4435
        pargs = {argc = 0x7fffffffdadc, argv = 0x7fffffffdad0, flags = 32769, err = 0, r_opt = 0, r_type = 0, r = {ret_int = 0, ret_long = 0, ret_ulong = 0, ret_str = 0x0}, internal = {idx = 2, inarg = 0, stopped = 0, last = 0x7fffffffe2d0 "--update-trustdb", aliases = 0x0, cur_alias = 0x0, iio_list = 0x0}}
        a = 0x7ffff6961ff8
        rc = 0
        orig_argc = 2
        orig_argv = 0x7fffffffe008
        fname = 0x0
        username = 0x7fffffffdd60 "\377\377\377\377"
        may_coredump = 0
        sl = 0x0
        remusr = 0x0
        locusr = 0x0
        nrings = 0x0
        afx = 0x0
        detached_sig = 0
        configfp = 0x0
        configname = 0x0
        save_configname = 0x719860 "/home/feandil/.gnupg/random_seed"
        default_configname = 0x719830 "/home/feandil/.gnupg/trustdb.gpg"
        configlineno = 218
        parse_debug = 0
        default_config = 0
        default_keyring = 1
        greeting = 0
        nogreeting = 1
        logfile = 0x0
        use_random_seed = 1
        cmd = aUpdateTrustDB
        debug_level = 0x0
        trustdb_name = 0x0
        def_cipher_string = 0x0
        def_digest_string = 0x0
        compress_algo_string = 0x0
        cert_digest_string = 0x0
        s2k_cipher_string = 0x0
        s2k_digest_string = 0x0
        pers_cipher_list = 0x0
        pers_digest_list = 0x71ac90 "SHA512"
        pers_compress_list = 0x0
        eyes_only = 0
        multifile = 0
        pwfd = -1
        fpr_maybe_cmd = 0
        any_explicit_recipient = 0
        require_secmem = 0
        got_secmem = 1
        malloc_hooks = {malloc = 0x406b10 <gcry_malloc@plt>, realloc = 0x4068b0 <gcry_realloc@plt>, free = 0x406f90 <gcry_free@plt>}
        ctrl = 0x719990
        __FUNCTION__ = "main"