Remove deadlock in raw.endpoint caused by recursive read locking

Prevents the following deadlock:
- Raw packet is sent via e.Write(), which read locks e.mu
- Connect() is called, blocking on write locking e.mu
- The packet is routed to loopback and back to e.HandlePacket(), which read
  locks e.mu

Per the atomic.RWMutex documentation, this deadlocks:

"If a goroutine holds a RWMutex for reading and another goroutine might call
Lock, no goroutine should expect to be able to acquire a read lock until the
initial read lock is released. In particular, this prohibits recursive read
locking. This is to ensure that the lock eventually becomes available; a blocked
Lock call excludes new readers from acquiring the lock."

Also, release eps.mu earlier in deliverRawPacket.

PiperOrigin-RevId: 359600926

0 files changed, 0 insertions, 0 deletions