Nathan Wallace 5ee33414b7 Fix concurrent access to sessions map in Close() closes #4793 (#4836) ...

* Add tests demonstrating bug #4793: Close() sets sessions=nil without mutex

These tests demonstrate the race condition where Close() sets c.sessions
to nil without holding the mutex, while AcquireSession() tries to access
the map with the mutex held.

Running with -race detects the data race and the test panics with
"assignment to entry in nil map".

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Fix #4793: Protect sessions map access with mutex in Close()

Acquire sessionsMutex before setting sessions to nil in Close() to prevent
data race with AcquireSession(). Also add nil check in AcquireSession() to
handle the case where Close() has been called.

This prevents the panic "assignment to entry in nil map" when Close() and
AcquireSession() are called concurrently.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

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Co-authored-by: Claude <noreply@anthropic.com>

2025-11-15 11:29:57 -05:00

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