Downgrade QUIC_BUG to QUIC_DLOG when trying to write stream data before encryption established in QUIC crypto.

PiperOrigin-RevId: 374693643

quic/core/http/quic_spdy_client_session_test.cc

diff --git a/quic/core/http/quic_spdy_client_session_test.cc b/quic/core/http/quic_spdy_client_session_test.cc
index 7197c8a..af17b54 100644
--- a/quic/core/http/quic_spdy_client_session_test.cc
+++ b/quic/core/http/quic_spdy_client_session_test.cc
@@ -278,10 +278,11 @@
   EXPECT_TRUE(session_->CreateOutgoingBidirectionalStream() == nullptr);
   // Verify that no data may be send on existing streams.
   char data[] = "hello world";
-  EXPECT_QUIC_BUG(
+  QuicConsumedData consumed =
       session_->WritevData(stream->id(), ABSL_ARRAYSIZE(data), 0, NO_FIN,
-                           NOT_RETRANSMISSION, ENCRYPTION_INITIAL),
-      "Client: Try to send data of stream");
+                           NOT_RETRANSMISSION, ENCRYPTION_INITIAL);
+  EXPECT_EQ(0u, consumed.bytes_consumed);
+  EXPECT_FALSE(consumed.fin_consumed);
 }
 
 TEST_P(QuicSpdyClientSessionTest, MaxNumStreamsWithNoFinOrRst) {

quic/core/quic_session.cc

diff --git a/quic/core/quic_session.cc b/quic/core/quic_session.cc
index 9d4a5d1..1bcb9dc 100644
--- a/quic/core/quic_session.cc
+++ b/quic/core/quic_session.cc
@@ -770,10 +770,24 @@
                     perspective() == Perspective::IS_CLIENT);
       QUIC_BUG_IF(quic_bug_12435_3, type == NOT_RETRANSMISSION)
           << ENDPOINT << "Try to send new data on stream " << id
-          << "before 1-RTT keys are available while 0-RTT is rejected.";
+          << "before 1-RTT keys are available while 0-RTT is rejected. "
+             "Version: "
+          << ParsedQuicVersionToString(version());
+    } else if (version().UsesTls() || perspective() == Perspective::IS_SERVER) {
+      QUIC_BUG(quic_bug_10866_2)
+          << ENDPOINT << "Try to send data of stream " << id
+          << " before encryption is established. Version: "
+          << ParsedQuicVersionToString(version());
     } else {
-      QUIC_BUG(quic_bug_10866_2) << ENDPOINT << "Try to send data of stream "
-                                 << id << " before encryption is established.";
+      // In QUIC crypto, this could happen when the client sends full CHLO and
+      // 0-RTT request, then receives an inchoate REJ and sends an inchoate
+      // CHLO. The client then gets the ACK of the inchoate CHLO or the client
+      // gets the full REJ and needs to verify the proof (before it sends the
+      // full CHLO), such that there is no outstanding crypto data.
+      // Retransmission alarm fires in TLP mode which tries to retransmit the
+      // 0-RTT request (without encryption).
+      QUIC_DLOG(INFO) << ENDPOINT << "Try to send data of stream " << id
+                      << " before encryption is established.";
     }
     return QuicConsumedData(0, false);
   }