fixed autorestart cooldown

[pompon0]

There was a semantic mismatch between blocksync sending at most 1 message to the restartCh, and WaitForQuitSignals which ignored messages until cooldown has passed. I think that cooldown in blocksync logic was exactly trying to avoid sending messages when WaitForQuitSignals could have ignored them, which is a very fragile way of doing things. This PR removes cooldown from WaitForQuitSignals, simply delegating the cooldown logic to blocksync and makes the signal nonblocking and idempotent.

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 17, 2026, 10:32 AM

[codecov]

Codecov Report

❌ Patch coverage is 30.61224% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.20%. Comparing base (243cc2a) to head (c6b72d7).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-cosmos/server/start.go	0.00%	16 Missing ⚠️
sei-tendermint/cmd/tendermint/commands/run_node.go	0.00%	9 Missing ⚠️
sei-cosmos/server/util.go	70.00%	0 Missing and 3 partials ⚠️
sei-tendermint/test/e2e/node/main.go	0.00%	2 Missing ⚠️
sei-tendermint/cmd/tendermint/main.go	0.00%	1 Missing ⚠️
sei-tendermint/internal/statesync/reactor.go	50.00%	1 Missing ⚠️
sei-tendermint/node/public.go	50.00%	1 Missing ⚠️
sei-tendermint/rpc/test/helpers.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2887      +/-   ##
==========================================
- Coverage   57.22%   57.20%   -0.03%     
==========================================
  Files        2093     2093              
  Lines      171771   171755      -16     
==========================================
- Hits        98294    98249      -45     
- Misses      64701    64724      +23     
- Partials     8776     8782       +6     

Flag	Coverage Δ
sei-chain	52.67% <20.40%> (-0.01%)	⬇️
sei-cosmos	48.15% <26.92%> (-0.04%)	⬇️
sei-db	68.72% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-tendermint/config/db.go	100.00% <ø> (ø)
sei-tendermint/internal/blocksync/reactor.go	61.56% <100.00%> (+0.11%)	⬆️
sei-tendermint/node/node.go	59.24% <100.00%> (+0.27%)	⬆️
sei-tendermint/node/seed.go	46.93% <ø> (+1.06%)	⬆️
sei-tendermint/cmd/tendermint/main.go	0.00% <0.00%> (ø)
sei-tendermint/internal/statesync/reactor.go	70.98% <50.00%> (+0.42%)	⬆️
sei-tendermint/node/public.go	52.38% <50.00%> (+2.38%)	⬆️
sei-tendermint/rpc/test/helpers.go	77.27% <0.00%> (-3.01%)	⬇️
sei-tendermint/test/e2e/node/main.go	0.00% <0.00%> (ø)
sei-cosmos/server/util.go	63.37% <70.00%> (-5.23%)	⬇️
... and 2 more

... and 27 files with indirect coverage changes

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[masih]

This is a bigger change than I was expecting: it fixes the bug discussed in Slack, and fundamentally changes the behaviour of the node. In that, after this change the process errors out instead of softly restarting the reactor in-process.

This is clearly simpler, but it means that without an external process supervisor there is no "restart" after self-remediation. The process simply dies.

I probably would have broken this into two PRs, just for the sake of release notes: one to fix the clear bug regarding restart trigger during cooldown, and one to remove it. At the very least this needs a mention in the next release notes for 6.3 patch release. Cc @philipsu522

No blockers.

[masih]

No blockers. Left couple of comments that are worth addressing, either here or in follow up PRs.

[seidroid]

Created backport PR for release/v6.3:

• Backport release/v6.3: fixed autorestart cooldown #2897 with remaining conflicts!

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-2887-to-release/v6.3
git worktree add --checkout .worktree/backport-2887-to-release/v6.3 backport-2887-to-release/v6.3
cd .worktree/backport-2887-to-release/v6.3
git reset --hard HEAD^
git cherry-pick -x 8fc1d5b9f36d09cf5e991687f8bd7bda4f04c5bc
git push --force-with-lease