fuzz: cover deferred writing in chanmon_consistency#4465
fuzz: cover deferred writing in chanmon_consistency#4465joostjager wants to merge 1 commit intolightningdevkit:mainfrom
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👋 Hi! I see this is a draft PR. |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #4465 +/- ##
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- Coverage 86.18% 86.17% -0.01%
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Files 156 156
Lines 108528 108636 +108
Branches 108528 108636 +108
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+ Hits 93532 93616 +84
- Misses 12386 12405 +19
- Partials 2610 2615 +5
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Rebased |
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Prerequisites are in, rebased. |
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This LGTM, why is it draft? |
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I first wanted to do a serious local run, but then it turned out there are so many pre-existing fuzz failures that it is hard to see what's new. I've bisected the failures to the various PRs that introduced them. |
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Although for this PR I could just see if anything pops up that doesnt repro on main. Will do that. |
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Several newly introduced fuzz failures to address: |
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Zoomed in on one of those sequences, and it seems it is reproducible with another string without deferred mode too. |
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Dependency: #4520 |
Add a deferred flag to TestChainMonitor that controls whether the underlying ChainMonitor queues operations instead of executing them immediately. The flag is derived from the first fuzz input byte so each of the three nodes can independently run in deferred or immediate mode, while the same byte also selects the channel type. In deferred mode, watch_channel and update_channel always return InProgress. A new flush_and_update_latest_monitors method drains the queued operations and, when the persister reports Completed, promotes the pending shadow monitor snapshots to persisted state. This method is called before release_pending_monitor_events, at each point where the fuzzer completes pending monitor updates, and after watch_channel during node reload so the node starts from a consistent state. The first-byte config layout now uses bits 0 to 2 for initial monitor status, bits 3 to 4 for channel type, and bits 5 to 7 for deferred monitor writes. This fixes the rebase conflict where deferred mode still referenced the pre-channel-type bit layout. AI tools were used in preparing this commit.
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Adds fuzz coverage for #4351