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My HSv3 is unable to encode its own descriptor with the following fail:

Jan 21 08:00:49.000 [info] connection_free_minimal(): Freeing linked Socks connection [open] with 0 bytes on inbuf, 0 on outbuf.
Jan 21 08:00:49.000 [info] handle_response_upload_hsdesc(): Uploaded hidden service descriptor (status 200 ("HS descriptor stored successfully."))
Jan 21 08:00:49.000 [info] handle_response_upload_hsdesc(): Uploading hidden service descriptor: finished with status 200 ("HS descriptor stored successfully.")
Jan 21 08:00:49.000 [info] connection_free_minimal(): Freeing linked Directory connection [client finished] with 0 bytes on inbuf, 0 on outbuf.
Jan 21 08:00:49.000 [info] circuit_finish_handshake(): Finished building circuit hop:
Jan 21 08:00:49.000 [info] internal (high-uptime) circ (length 4, last hop damita): $E2920D7419B7601CF82D43400D042DA70E0675B2(open) $CA58EB617C6CA2F351AEFD56C84B8A7AF7704B22(open) $0E3D3FCE26F6969B7AE80E4CA6C4CFA97988F31E(open) $A9F7185499C5784E35B5C25744ED4AB75437CE5D(open)
Jan 21 08:00:49.000 [info] entry_guards_note_guard_success(): Recorded success for primary confirmed guard papadouka ($E2920D7419B7601CF82D43400D042DA70E0675B2)
Jan 21 08:00:49.000 [info] circuit_build_no_more_hops(): circuit built!
Jan 21 08:00:49.000 [info] pathbias_count_build_success(): Got success count 224.332749/291.637758 for guard papadouka ($E2920D7419B7601CF82D43400D042DA70E0675B2)
Jan 21 08:01:06.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 5296 ms. Delta -4ms
Jan 21 08:01:12.000 [info] routerlist_remove_old_routers(): We have 0 live routers and 0 old router descriptors.
Jan 21 08:01:19.000 [info] or_state_save(): Saved state to "/home/f/.tor/state"
Jan 21 08:01:25.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 5996 ms. Delta 2ms
Jan 21 08:01:32.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 6840 ms. Delta -2ms
Jan 21 08:01:43.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 2096 ms. Delta 0ms
Jan 21 08:01:51.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 7912 ms. Delta 0ms
Jan 21 08:01:57.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 6456 ms. Delta 0ms
Jan 21 08:02:05.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 7952 ms. Delta 3ms
Jan 21 08:02:07.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 2280 ms. Delta 1ms
Jan 21 08:02:12.000 [info] routerlist_remove_old_routers(): We have 0 live routers and 0 old router descriptors.
Jan 21 08:02:20.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 3756 ms. Delta 2ms
Jan 21 08:02:33.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 8344 ms. Delta 0ms
Jan 21 08:03:00.000 [info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 58 to 86.106.137.6:443 (E2920D7419B7601CF82D43400D042DA70E0675B2) after 4508 ms. Delta 2ms
Jan 21 08:03:04.000 [info] run_upload_descriptor_event(): Initiating upload for hidden service current descriptor for service j2eiu2izwjpazjevu4xs3muaif3jzex3nnvnu677vz2fypmzccvhhiid with 3/3 introduction points.
Jan 21 08:03:04.000 [info] close_directory_connections(): Closed 0 active service directory connections for descriptor 9btQxrMpxWDJwnf1TU6U+5vcPmPdD2OPBVAKKmRLr7I of service j2eiu2izwjpazjevu4xs3muaif3jzex3nnvnu677vz2fypmzccvhhiid
Jan 21 08:03:04.000 [info] crypto_strongest_rand_fallback(): Reading entropy from "/dev/urandom"
Jan 21 08:03:04.000 [info] crypto_strongest_rand_fallback(): Reading entropy from "/dev/urandom"
Jan 21 08:03:04.000 [warn] Invalid signature for service descriptor signing key.
Jan 21 08:03:04.000 [warn] tor_bug_occurred_(): Bug: src/or/hs_descriptor.c:2357: hs_desc_encode_descriptor: Non-fatal assertion !(ret < 0) failed. (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug: Non-fatal assertion !(ret < 0) failed in hs_desc_encode_descriptor at src/or/hs_descriptor.c:2357. Stack trace: (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(log_backtrace+0x42) [0x7ffa9cd66ac2] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(tor_bug_occurred_+0xb7) [0x7ffa9cd81cd7] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(hs_desc_encode_descriptor+0xb2) [0x7ffa9cd4d782] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(hs_service_run_scheduled_events+0x21f3) [0x7ffa9cd570d3] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(+0x4ca31) [0x7ffa9cc30a31] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(+0x6cdc0) [0x7ffa9cc50dc0] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5(event_base_loop+0x7fc) [0x7ffa9c2673dc] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(do_main_loop+0x25c) [0x7ffa9cc34c9c] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(tor_run_main+0x265) [0x7ffa9cc360b5] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(tor_main+0x3a) [0x7ffa9cc2f71a] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(main+0x19) [0x7ffa9cc2f489] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1) [0x7ffa9b45a2b1] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(_start+0x2a) [0x7ffa9cc2f4da] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] tor_bug_occurred_(): Bug: src/or/hs_service.c:2245: upload_descriptor_to_hsdir: Non-fatal assertion !(hs_desc_encode_descriptor(desc->desc, &desc->signing_kp, &encoded_desc) < 0) failed. (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug: Non-fatal assertion !(hs_desc_encode_descriptor(desc->desc, &desc->signing_kp, &encoded_desc) < 0) failed in upload_descriptor_to_hsdir at src/or/hs_service.c:2245. Stack trace: (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(log_backtrace+0x42) [0x7ffa9cd66ac2] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(tor_bug_occurred_+0xb7) [0x7ffa9cd81cd7] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(hs_service_run_scheduled_events+0x23e7) [0x7ffa9cd572c7] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(+0x4ca31) [0x7ffa9cc30a31] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(+0x6cdc0) [0x7ffa9cc50dc0] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5(event_base_loop+0x7fc) [0x7ffa9c2673dc] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(do_main_loop+0x25c) [0x7ffa9cc34c9c] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(tor_run_main+0x265) [0x7ffa9cc360b5] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(tor_main+0x3a) [0x7ffa9cc2f71a] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(main+0x19) [0x7ffa9cc2f489] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1) [0x7ffa9b45a2b1] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)
Jan 21 08:03:04.000 [warn] Bug:     ./tor/src/or/tor(_start+0x2a) [0x7ffa9cc2f4da] (on Tor 0.3.3.0-alpha-dev d69c8f7117a5975a)

That started happening 4 days after I started up Tor and it persists up to today: my HS is still unable to create its own desc...

FWIW, the only difference from the past is that I've been using vanguards but that should not influence the signing of the desc....