• Move lock acquisition before reportedProviders read in GetReportedProviders
• Prevents race condition between GetReportedProviders and UpdateAllProviders
• Eliminates "Failed to find reported provider" error at epoch boundaries
• Add comprehensive test reproducing and validating the race condition fix

Move lock acquisition before reportedProviders read

• Moved csm.lock.RLock() acquisition to before reading reportedProviders
• Added explanatory comment describing the race condition and fix
• Ensures epoch check and pairing lookup are atomic under the same lock

protocol/lavasession/consumer_session_manager.go

Add test for reported-provider race condition

• Added TestGetReportedProviders_EpochTransitionRace test function
• Reproduces the race condition by holding write lock while GetReportedProviders runs
• Validates that fix prevents stale data from being returned
• Includes detailed comments explaining the race window and expected behavior

protocol/lavasession/consumer_session_manager_test.go

Description

TestGetReportedProviders_EpochTransitionRace uses time.Sleep to orchestrate a concurrent
interleaving, so it can pass even if the pre-fix race still exists (the goroutine may not run until
after Reset+Unlock). This makes the regression test nondeterministic and allows false negatives on
slow/loaded CI.

Code

protocol/lavasession/consumer_session_manager_test.go[R1547-1549]

+	// Give the goroutine enough time to reach the RLock blocking point.
+	time.Sleep(100 * time.Millisecond)
+

Evidence

The test’s expected outcome is require.Empty(t, result). If the goroutine running
GetReportedProviders doesn’t execute before csm.reportedProviders.Reset() (because scheduling
delays exceed the fixed 100ms sleep), then even the old buggy implementation would read an
already-reset (empty) reportedProviders list and return empty, passing the test without validating
the fix.

protocol/lavasession/consumer_session_manager_test.go[1537-1568]
protocol/lavasession/consumer_session_manager.go[1773-1796]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

### Issue description
`TestGetReportedProviders_EpochTransitionRace` uses `time.Sleep` to guess when the goroutine has reached the lock boundary. This can produce false negatives (test passes even when the bug exists) due to scheduler/CI variability.

### Issue Context
The test’s correctness depends on forcing a very specific interleaving. `time.Sleep` is not a synchronization primitive and cannot guarantee the goroutine reached the intended point.

### Fix Focus Areas
- Replace the `time.Sleep(...)` with deterministic coordination (e.g., a channel/WaitGroup barrier) so the test *guarantees* the goroutine is blocked on `csm.lock.RLock()` (or at least has progressed past the intended pre-lock step in the old implementation).
- protocol/lavasession/consumer_session_manager_test.go[1534-1568]

### Suggested approach (one option)
- Add an instrumented helper or hook (only in tests) that allows signaling right before/after the lock acquisition in `GetReportedProviders`, or
- Use `runtime.Gosched()` loops + a channel barrier that the goroutine closes after it reaches a known point (requires adding such a point), and only then perform the Reset/unlock sequence.

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Description

The new test claims to reproduce the "Failed to find a reported provider in pairing list" race, but
it never rebuilds pairing to remove the reported provider, so it cannot hit the not-found path that
emits that error. As written, it only validates stale snapshot behavior after
reportedProviders.Reset().

Code

protocol/lavasession/consumer_session_manager_test.go[R1550-1554]

+	// Reset reportedProviders while holding the lock — this is what
+	// UpdateAllProviders does (along with rebuilding pairing).
+	// We only reset reportedProviders; pairing still contains A.
+	csm.reportedProviders.Reset()
+	csm.lock.Unlock()

Evidence

The production error is logged only when csm.pairing[reportedProvider.Address] lookup fails in
GetReportedProviders. The test explicitly keeps pairing intact (comment: "pairing still contains
A") and only resets reportedProviders, so the !ok branch is not exercised and the test does not
actually validate the reported production failure mode.

protocol/lavasession/consumer_session_manager.go[1782-1790]
protocol/lavasession/consumer_session_manager_test.go[1550-1568]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

### Issue description
The test claims to reproduce a pairing mismatch (“reported provider not found in pairing list”), but it never removes the reported provider from `csm.pairing`, so it cannot exercise the real failure mode.

### Issue Context
The logged error occurs when the reported provider address is present in the reportedProviders snapshot but missing from `csm.pairing`.

### Fix Focus Areas
- Update the test to actually rebuild `csm.pairing` under `csm.lock.Lock()` to exclude the reported provider (mirroring `UpdateAllProviders` behavior) and assert the function does not emit/trigger the not-found path (or at least assert behavior consistent with the intended fix).
- Alternatively, adjust the test name/comment to match what it really tests (stale reportedProviders snapshot only).
- protocol/lavasession/consumer_session_manager_test.go[1495-1569]
- protocol/lavasession/consumer_session_manager.go[1773-1796]

### Suggested test change
- While holding `csm.lock.Lock()`, perform both:
 - `csm.reportedProviders.Reset()`
 - mutate `csm.pairing` to remove the reported address (or swap in a new pairing map without it)
- Then release lock and assert `GetReportedProviders` returns a consistent result and does not go through the missing-pairing branch.

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