Fuzz failure backlog

[joostjager]

The fuzzer hasn't been running reliably lately, which has led to a backlog of undetected fuzz failures accumulating over time. To work through this, I developed a git multi-bisect tool that traces each failure back to the PR that
originally introduced it. All of the identified failures are crashes in fuzz-only or unreleased code. Commit d830f10 450c03a on main

7785360 Merge pull request #4320 from TheBlueMatt/2026-01-live-holding-cells (@TheBlueMatt)

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7044bc7 Merge pull request #4367 from joostjager/fuzz-multi-channels (@joostjager)

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d627ce1 Merge pull request #4411 from wpaulino/splice-fuzzing-fixes (@wpaulino)

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98501d6 Merge pull request #4388 from jkczyz/2026-02-splice-discard-funding (@jkczyz)

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a6e6676 Merge pull request #4402 from TheBlueMatt/2026-02-trampoline-cltv-consistency (@TheBlueMatt)

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98393b3 Merge pull request #4416 from jkczyz/2026-02-splice-acceptor (@jkczyz)

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a7b4519 Merge pull request #4427 from jkczyz/2026-02-splicing-rbf (@jkczyz)

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61a0b9b9000000000000000031ffffa48080ffb1a6a4ffa6ffa0ffaccd
0fa30f84321b41b1adac49ffffb0ffa2a0ffffac481b01b52323192319
3a24b7a4b780ffa05bff24a4ff15ffabffffffffff06b1b1b1ff2d
3a24b7a4b780ffb0ffa2a0ffabacadffffffffff15ffffffff06ff2d
ad4aa480ffffb960a05858005affaba0cab284
aba01500000000001500000000000080ffb1a0ffab0080b1ffaba0ff
d4a480ff68a070ffa8a8b6acffb6b6b6b6b6b6b6b6b6b6b6b6b6000000
01ffa4a42780ffa4800040ffac010000003145ff45
3aa4ffb7805bb7ff24a480ff5bffb7ffb7acffb7805bb7ffffff2d
61a015adffb30fa30ec18484a18484a10823a440414043aaaaa0ffaccd
ffa480ffff0a0a0aff41a0ffaaa0aba480ffff
ff4140a019808080111980ffaaa000ffabaab000a0ab00acff
0000000080ff8008a4ffff41801119a472b6b6b6ff41b41bacadff0102
22a01200161bff3115848084a4a1153012007116b1a0b0ffabac001831
23b0a4ff8080b1ffa4ffb3ff8080b1ffacffb3ffb3ffb3ffb3
11a6ffb6b6b6b6a4ffb6b6b580bebebc41b1ff55a0a2ffabadac411902
61080002a2aaa0ffaaaaadaa80aaa0ffa9adcdcdffabac011200000dad
a2a23b1bffff633b84843ba2a23b1bffff633b84843bffadffffadff
a4a42780ffffffffffffffffffffffffff1f26ffffaaa0ffabac00ff
61a000ffffffffffff80ffffff40000802b3a9aaa2aaaaaaaaa0ffaccd
ffa0ffa3011780c8701070ffb0ffa2a01bffab
23b0ffa4ff8080b1ffa4ffb3ff80b3ffb3a4ffb3ffb3ffb3a0b0ffabb3
61a000ff081f1f301a2480aaaaaaa0ff00adcdcd0018acad
80a4803b70ffa4ffffff060660ffffffacff8080b1ffffffffff000060
11a6ffff4110b9a4ffff3d80bba4a600000000000000ffa4ffac2cb6b6
5b262680ffa4a42780ffa4ff80ffa480ffa4a427ffabffffffff1f264c
70801da1ff0162a0ffabac1a001ab0ffa200ab10191140801a
80a4803b70ffa4ffffffabffffffffff0affffffffff80
23b0a4ff80b014000000a2a0adffaca25dab0580a9ff21ffb3ffb3ffb3
b4ffb4b780a410428480ffffb4b780f5ffffffa410428480ffab307033
b784a461a000aa12aaaaaaa6ffbeb7ffb4ffb7a1ffaaaccd
ffb0ffa2a0ffffffff34110a22ffff80a015ffab69a5ffffa2b0
187080a1a270ffaaa0ffac70c0307a00843832ffffffff8419ff8080
09ff80a4abff09ff80a4ff80a4abff09ff80a4a603a402b5a6010000
23b0a4ffff80a4ffb1ffb38080800002aca60080b1ffa4ffb3ffb3ffb3
23b0a4ff0440000080a4b0b3ffb0a40aa2a0ffab512254ffffffffb3
103dffa000408010ffffffa04b1031ffffffffffffff35acadffffb1b0
265b80ff26a4a42780ffa480ffa480ffa4ff80ffa4ffffffff1fac264c
28ffa480ffa4a4ffffff2780ff000200abfdff2839dffbfbfbfbfbfb
60b580bebe1012a601841b1831bc41b1ff55a0a2ffabad41b1ff11801d
ffa0c9801119800284ffa3a6ffb600000017a40c0000ffb3ff45ffacad
b96970a480ff27a480ffffb960ffb0ffa2a2ffadffb9acb9b9b3b9
610800a0700080ffa9aaaaaa4100a0ffa9accdcdffab17ad
a7a6ff014084ffa6ffffffffffad
70804870a4a6a6808440192211a68084ffa2a0ffabac01bc00000000b9
6108aaaaaaaaa0ffa9ff41ff80a4a4ff41bb3dbb80ffac
3a24ffa4ff8012245ba432ff11a63dff41fffffcfcfc1084ffabababab
8480a4a1840800001aa4a10ab2a015ffabaca5101d000003ffffa21a09
23b0a4ff8080b1ffa4ffb3a38080b1ffa4ffb3ffb3ffabb323b0a4ffb3
343434a2801230220100000032161616ffa1a0ffff06a4a6ffacff8412
23b0a4ff8080b1ffa4140000ffac48b023b0a4
23b0a4ff8080b0a4ff8080b1ffacffb3ffff
23b0a4ffff80a4ffb1ffb38080801eac0000a480b1ff74000000000000
ffb0ffa2a0ff1100a6bcabb1b084adacffffa2a0ffabffac2cada2b0
5b262680ffa4a42780ffa40e000000a0ffabacb1ffffb1b0a2b01f264c
848426a4a10100003a0000ffffacad19232323a108101d0080ff1a1a74
ffa4ff8041a4ff41bb3dbb80ff41ab3d80ff41bbbb80a480ff5780
70a42780aaffa480ffb0ffa20effabadadffffb1b0a2a4
5b262680ffa4a42780ffa480ffacffffff04e0264c
61ffffffffffffa000ff0802b3b7f58040a9baa2aacbaaaaa0ffac29
ffffa2a0ffffffffff484845803b0aa0a0ffabadadff0670005848b140
3a0015a4b780ffa05bb7ff240ba4ffff0aabfffbff2d
6108aaaaaaada0ff80402661ffffffffaaa0ffa9ac4d4d4d4d4d4d4dad
23b0a4ff80b080a4fe8080b1ffa4ffb3ff8080b0a4ff8080b1ffabffff
5b262680ffa4a42780ffa480ffabffffffffffffffff1f264c

24000000a3a2ffb6b6ff41108421084210b6a3a6ffffffb6b6
a1a47080a1ff34ffffffa4a47080a1ff34ffffffa47070ff3f00
108421084210a0a170ff41108421084210a0a1ff
781fa4a11a5c1972107010107219bbbbbbbbbbbbbb3dbb0000001f
848426a400ff1d1a10a4001d10a1081aa4a410ffffff1d002764260874
70ff41108421084210a070ff41108421084210a0a1ff
70a42780ffa4ffff80a4b623a11aa42780ffa4ffff80a4b623a11a82df
d4a480b9a100ff39ffa41fb90000b9a100ff39ffa41fb9ffffb9
a2a13ba2ffffff72003a000c00a4a6a484a1ff004080fffff5ff9f
84aca2a4a108a100000061080002a2ff10aaa0101d8484001aa1ffaa
2e80b408a1ff26ffffa01049a1ff26ffffa01049
388080ffff8480a4a10800001aa64cff84808480aca10800401aa6
2e80001a001a10a4ff38c3388023ffb680a1a0ffffff00a110
a1a47080a1ffffffffa1ffffa47000ffffffffffffffff
5b00a1a4ffff800000003d00c00000a1a4ffff80000000ff
3ea4a2ffffa4002424240b11f5f5f184a11aa6a4ff8d8d8d8d8d9772ff
a3a2ffb6b6ff411084210842fc00000010b6a3a6ffffb6b6b6
848426a4a108a10000ff0088848426a4a108a10000ff00881aa43a1d00
ffa00284ffa3a6ffb6a6b6b6a1a4a6b6b6a1a40c0000ff
ffa00284ffa3a6ffb6b6b0b6a1a40c0000ff
b784a4a6ffbe84a4a6ffbeb7ffb4ffb7a1b7ffb4ffb7a1ffb7b3
3e80b4ffa0ff80a426490180003ab9000023b0a48181a100ff
23b0a48181a1ffffff3d1a5cff0c84a1a484803dffa4ffb3ffff
27a360a6a4ff84ffffff27a360a6ffffd2
caffa480ffb6b6b6b6ffa480ff11a6b6b6a0a105ff80a010ff
ca24a6ffffffff64b942ca8438a324a6ffffffff64b942c3ffa380a3
d4a480b9a1ffa480b9a1ffff39ff39ff57e0000070000070ffffffb9
848480a4a10800001aa410ada63bb0ff1b1801130113493d49fd01a1
848480a4a10800408480a41aa4101b18abac1a00b0ffabac1349101b18
a1a47080a1ffffffffffa1ffffa47000ffffffffa1ffffa47000ff
d668a0157000001000000080a1ffa47080a1ffff
343434a28012302200000032161616ffa1a0ffff0612ffffac11151535
781fa4a11a5c197210701010727272003b13b13b13b13b00001f
22a01200161bff311580800012a13014a484711608101b1dffff07ff31
d3b7a4a4a6ff848484beb7ffb7b4a4a6ff848484ffb4ffb7a1ffb7b3b3
a3a3a6ffb6b6b6b6b6b6ff88b6a4a6a3ffb6b6b6a3a6ffb6b6b6b6
848484a48473ffffffffff10a10800401a848484a4a108ff
781f845c107072a11a5caaa0ffadadaccdcdffab10
d9a3a2a2a2a221a0003b19b13b13b13ba274b8ff12acb1
d3b7a4a4a6ff848484beb7ffb7b4ffb7a0ff4948104bffb7a1ffb7b3b3

fd08d54 Merge pull request #4489 from wpaulino/re-enable-single-channel-signer (@wpaulino)

941f010000000019000084a11af2845c10701865cd1db3ff4f72ba4a0a

1050ed9 Merge pull request #4436 from joostjager/revert-mixed-mode-check (@joostjager)

2e227412b969ffb0ffa2a2ffadffb9acb9b9b9b9ab05b3b3b912843470
fe01000005ffff5941117031b81c00b8b8b8b8b832b2b8b832b2b8b8
feffff21ffff05ff5941117030b8b8b8b8b831b2b8b8

d830f10 Merge pull request #4496 from joostjager/fix-fuzz-missing-msgs (@joostjager)

fefdffffffffff004111700000001d0100000000000580b832b240b8b8
c985f28584a0a221ffabac1aac1a041ab1ffa246a0abac1a8484
b2ffb70001ff35410510b7b7ff40

[joostjager]

#4436 and #4496 failures fixed in #4506

[TheBlueMatt]

CCing lightningdevkit/ldk-node#857 which hit debug_assert!(!self.context.channel_state.is_monitor_update_in_progress()); at the top of on_tx_signatures_exchange - need to make sure we fix that and hopefully one of the fuzzers here is hitting it/reproducing it.

[jkczyz]

Mentioned offline but FYI the following input triggers it: 5ba164a3a2ffffffff84803dffa4ffffff20ffff64a3a2ff65ffff20 (cc: @wpaulino).

[wpaulino]

@jkczyz that doesn't reproduce on main, it should have been fixed already by #4472.

[jkczyz]

Ah, regarding LDK Node's issue, it's LDK dependency was dcf0c20 which was merged prior to your fix.

[joostjager]

Updated description with everything fixed striked through.

[joostjager]

The original set of fuzz failures also revealed flakyness in fuzzing:

00000fa30ec123a440410010c884a61b330d1b27fe (7/10)
232323a30fb30f81a3231a230f232323232319b9ff69b9b969b9b995b9 (5/10)
2e227412b969ffb0ffa2a2ffadffb9acb9b9b9b9ab05b3b3b912843470 (4/10)
3084a44041001084a61a11b7ff (8/10)
60101a001a10a4401e525252525274524960101a80c5b6ff3f11008c (8/10)
a4a6a470605d101060601a09b7aba4a6ff68b710001a60 (7/10)
b2ffb70001ff35410510b7b7ff40 (9/10)
c985f28584a0a221ffabac1aac1a041ab1ffa246a0abac1a8484 (5/10)
fe01000005ffff5941117031b81c00b8b8b8b8b832b2b8b832b2b8b8 (5/10)
fefdffffffffff004111700000001d0100000000000580b832b240b8b8 (5/10)
feffff21ffff05ff5941117030b8b8b8b8b831b2b8b8 (6/10)
ff3b0fa30ec023a440410010c884a61b3300ad70b2ff70 (8/10)

All these have since been fixed, but it is good to also fix determinism for next time: #4525

[joostjager]

We have to be careful with concluding that something is fixed on main, because 62c58b8 changed the fuzzer to not always test legacy and anchor types.

[joostjager]

@jkczyz would it be an idea to, for now, disable splicing in the fuzzer on main until it runs reliable? That way it doesn't hide other fuzz failures.

[jkczyz]

The one that I mentioned seem to be the only legitimate failure. The others were related to the fuzz tests not being updated to handle RBF messages. Are there other failures happening still?

[joostjager]

The issue description shows what's still left. Everything that is fixed on main is striked through.

[jkczyz]

Updated the chanmon_consistency fuzz test to better support RBF in #4536. This fixed most of the failures, leaving five real failures that still need to be addressed. Here is Claude's analysis, FWIW. (cc: @wpaulino)

Remaining chanmon_consistency fuzz failures

All involve multiple splice attempts on the same channel combined with node
restarts. The SendErrorMessage ones indicate splice reestablishment bugs; the
stuck payments likely follow from the same underlying state desync.

Stuck pending payments (2 inputs)

Payments sent during splice activity are never resolved (neither succeed nor
fail) after node restarts. Both involve splice RBF on channel A-B, payments
sent mid-splice, and a node restart.

781f84a10a5c107010101872ffffff84a1acbdbd30ffff187210

78 initial config
1f process_ev_noret!(1, false)
84 timer_tick node 0
a1 splice_in node 1 for chan_a
0a mon_style change
5c send_noret (payment)
10 process_msg_noret!(0, true, ProcessMessages::AllMessages)
70 send_mpp_direct(0, 1, &chan_ab_ids, ...)
10 process_msg_noret!(0, true, ProcessMessages::AllMessages)
10 process_msg_noret!(0, true, ProcessMessages::AllMessages)
18 process_msg_noret!(1, true, ProcessMessages::AllMessages)
72 send_mpp_hop(0, 1, &chan_ab_ids, 2, &[chan_b_id], ...)
ff send payment
ff send payment
ff send payment
ff send payment
84 timer_tick node 0
a1 splice_in node 1 for chan_a (second splice / RBF)
ac sync node 1 to chain tip
bd restart node C
bd restart node C (again)
30 process_msg_noret!(2, true, ProcessMessages::AllMessages)
ff send payment
ff send payment
18 process_msg_noret!(1, true, ProcessMessages::AllMessages)
72 send_mpp_hop(0, 1, &chan_ab_ids, 2, &[chan_b_id], ...)
10 process_msg_noret!(0, true, ProcessMessages::AllMessages)

Splice on A-B, MPP payments via A->B->C, multiple sends, second splice (RBF)
on A-B, sync node 1, restart node C twice, more sends and MPP hop payments.
Payments get stuck after the node C restart disrupts the B-C forwarding path.

5acaa0ffab84a1ff004080adb8b8

5a initial config
ca enable GetPerCommitmentPoint for node C signers + signer_unblocked
a0 splice_in node 0 for chan_a
ff send payment (splice negotiation completes, SplicePending fires)
ab sync node 0 to chain tip
84 timer_tick node 0
a1 splice_in node 1 for chan_a (second splice / RBF)
ff send payment
00 mon_style change
40 send_hop_noret (payment)
80 process_msg_noret!(0, true, ProcessMessages::AllMessages)
ad sync node 2 to chain tip
b8 restart node B
b8 restart node B (again)
 (input exhausted -> test_return!)

Splice on A-B, complete it, second splice (RBF) on same channel, send a
payment, process messages, restart node B twice, input runs out. Payments
sent mid-splice are never resolved after node B restart.

SendErrorMessage closing the channel (3 inputs)

"Got a single commitment_signed message when expecting a batch"

0fa30f2300ffb30fb32323190f2325232300acadff

0f initial config
a3 splice_in node 2 for chan_b
0f mon_style change
23 process_msg_noret!(2, false, ProcessMessages::OneMessage)
00 mon_style change
ff send payment (splice negotiation completes, SplicePending fires)
b3 restart node B
0f mon_style change
b3 restart node B (again)
23 process_msg_noret!(2, false, ProcessMessages::OneMessage)
23 process_msg_noret!(2, false, ProcessMessages::OneMessage)
19 process_msg_noret!(1, false, ProcessMessages::AllMessages)
0f mon_style change
23 process_msg_noret!(2, false, ProcessMessages::OneMessage)
25 process_msg_noret!(2, false, ProcessMessages::OnePendingMessage)
23 process_msg_noret!(2, false, ProcessMessages::OneMessage)
23 process_msg_noret!(2, false, ProcessMessages::OneMessage)
00 mon_style change
ac sync node 1 to chain tip
ad sync node 2 to chain tip
ff send payment -> "Got a single commitment_signed when expecting a batch"

Splice on B-C channel completes, node B restarts twice, channel reestablish
exchanged between nodes 1 and 2. Node 2 sends a single commitment_signed to
node 1, but node 1 (restarted with pending splice funding) expects a batch
(one per funding). Channel force-closed.

ff4141a0ffaaa0ab0000ffb00eaaa0ab00acff0000000000

ff initial config
41 send_hop_noret (payment)
41 send_hop_noret (payment)
a0 splice_in node 0 for chan_a
ff send payment (splice negotiation completes, SplicePending fires)
aa sync node 2 by 1 block
a0 splice_in node 0 for chan_a (second splice / RBF)
ab sync node 0 to chain tip
00 mon_style change
00 mon_style change
ff send payment (processes events/messages)
b0 restart node A
0e mon_style change
aa sync node 2 by 1 block
a0 splice_in node 0 for chan_a (third splice attempt on restarted node)
ab sync node 0 to chain tip
00 mon_style change
ac sync node 1 to chain tip
ff send payment -> "Got a single commitment_signed when expecting a batch"
00 mon_style change
00 mon_style change
00 mon_style change
00 mon_style change
00 mon_style change

No node B restart. Two splices complete on chan_a, then node A restarts, a
third splice is attempted. splice_locked is sent for the first splice before
all messages are fully processed. The final send triggers a single
commitment_signed to node 0 (channel 8900) when a batch is expected due to
pending splice fundings. Channel force-closed.

"Received tx_signatures before initial commitment_signed"

84841aa4101b18101b10181b101b101b18a4101b1a5b0aa2a0b8ff490a

84 initial config
84 timer_tick node 0
1a process_msg_noret!(1, true, ProcessMessages::OneMessage)
a4 splice_out node 0 for chan_a
10 process_msg_noret!(0, true, ProcessMessages::AllMessages)
1b process_msg_noret!(1, false, ProcessMessages::OneMessage)
18 process_msg_noret!(1, true, ProcessMessages::AllMessages)
10 process_msg_noret!(0, true, ProcessMessages::AllMessages)
1b process_msg_noret!(1, false, ProcessMessages::OneMessage)
10 process_msg_noret!(0, true, ProcessMessages::AllMessages)
18 process_msg_noret!(1, true, ProcessMessages::AllMessages)
1b process_msg_noret!(1, false, ProcessMessages::OneMessage)
10 process_msg_noret!(0, true, ProcessMessages::AllMessages)
1b process_msg_noret!(1, false, ProcessMessages::OneMessage)
10 process_msg_noret!(0, true, ProcessMessages::AllMessages)
1b process_msg_noret!(1, false, ProcessMessages::OneMessage)
18 process_msg_noret!(1, true, ProcessMessages::AllMessages)
a4 splice_out node 0 for chan_a (second splice / RBF)
10 process_msg_noret!(0, true, ProcessMessages::AllMessages)
1b process_msg_noret!(1, false, ProcessMessages::OneMessage)
1a process_msg_noret!(1, true, ProcessMessages::OneMessage)
5b ???
0a mon_style change
a2 splice_in node 1 for chan_b
a0 splice_in node 0 for chan_a (third splice on same channel)
b8 restart node B
ff send payment (reconnect, process events)
49 send_noret (payment)
0a mon_style change

Two splice_outs on chan_a with interleaved OneMessage processing, then a third
splice attempt, node B restart. After reconnection, node 1 sends tx_signatures
to node 0 before the splice's initial commitment_signed. Node 0 force-closes
the channel.