Predator and CL could not provide any possible suspects.
Using the code search for the file, “quic_sent_packet_manager.cc” assigning to concern owner from GIT blame.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/1468369698895ac22502a47ff52270d71467e05a

@jri  -- Could you please look into this issue, kindly reassign if it has nothing to do with your changes.
Thank You.

ClusterFuzz has detected this issue as fixed in range 528550:528560.

Detailed report: https://clusterfuzz.com/testcase?key=4855436821135360

Fuzzer: libFuzzer_net_quic_stream_factory_fuzzer
Job Type: libfuzzer_chrome_asan_debug
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  LargestAcked(ack_frame) <= unacked_packets_.largest_sent_packet() in quic_sent_p
  net::QuicSentPacketManager::OnIncomingAck
  net::QuicConnection::OnAckFrame
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=519442:519485
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=528550:528560

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4855436821135360

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 4855436821135360 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.