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pkgs.tincr: 2026-05-15 -> 2026-08-09, fix PMTU blackhole lockup

Point at Lassulus/tincr fix/pmtu-blackhole-recovery (upstream main plus
the fix) until it lands in Mic92/tincr.

ignavia and coaxmetal sit behind the same NAT, which does not hairpin.
Once a relay hands each the other's reflexive address, every UDP probe
is answered with ICMP port unreachable, and tincr never recovers:
udp_timed_out measured from the probe send rather than the reply, so
the 10s keepalive kept pushing a 30s deadline out of reach and
udp_confirmed stayed pinned; with it pinned, discovery collapsed maxmtu
to 0 and nothing re-armed it, so every cycle re-converged to MTU 0.
Logged as "Fixing MTU of coaxmetal to 0" 201 times in 30 minutes with
the peer unusable, versus once for every healthy peer.

Also carries upstream PRs #13-#20 (riscv64, tincd-compat, default
package, systemd credential loading, multi-user.target).

author
lassulus date (Aug 9, 2026, 8:45 PM CEST) commit ae6c2a7d parent 135d9f28
+14 -6
+10 -4
5pkgs/tincr/package.nix
··· 7 7 8 8 rustPlatform.buildRustPackage { 9 9 pname = "tincr"; 10 - version = "0-unstable-2026-05-15"; 10 + version = "0-unstable-2026-08-09"; 11 11 12 + # Lassulus/tincr = upstream main + fix/pmtu-blackhole-recovery. Point 13 + # back at Mic92/main (and revert update.sh) once that lands upstream. 14 + # Without it a UDP path that dies after being confirmed is never 15 + # abandoned: udp_confirmed stays pinned, maxmtu sticks at 0, and the 16 + # peer logs "Fixing MTU ... to 0" every 3.4s forever. Bites any two 17 + # nodes behind the same non-hairpinning NAT (ignavia <-> coaxmetal). 12 18 src = fetchFromGitHub { 13 - owner = "Mic92"; 19 + owner = "Lassulus"; 14 20 repo = "tincr"; 15 - rev = "7f622240"; 16 - hash = "sha256-V1Q7G/PP0w5iDgvIntU4YStniLBb6OUg6F1aMfRl84M="; 21 + rev = "32a10488622ad271942078712c3708cab66347ba"; 22 + hash = "sha256-zagrdeJIhS6G0fDjf2tM5oA3HS9kX42UuVm8zOqVvtE="; 17 23 }; 18 24 19 25 cargoHash = "sha256-3zq9SoOiBRqwXWr7N0NRW+oM2OLu8/IY3B3WCCZ0Chw=";
+4 -2
5pkgs/tincr/update.sh
··· 1 1 #!/usr/bin/env bash 2 2 set -euo pipefail 3 3 4 - owner=Mic92 4 + # Tracking the fork branch that carries fix/pmtu-blackhole-recovery. 5 + # Revert to owner=Mic92 / branch=main once it merges upstream. 6 + owner=Lassulus 5 7 repo=tincr 6 - branch=main 8 + branch=fix/pmtu-blackhole-recovery 7 9 attr=tincr 8 10 9 11 pkg="$(dirname "$(realpath "$0")")/package.nix"