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seeing some recent changes to 'http2_hpack_decoder.cc' https://chromium.googlesource.com/chromium/src/+/ec84e4ea604deb4d6cca4b72ce6f97babf99878b

xunjieli@, could you please check the issue and help.

FWIW, it's a new fuzzer, not a regression in existing one.
 Issue #691214  might be the same.

ClusterFuzz has detected this issue as fixed in range 454694:454733.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5967113060876288

Fuzzer: libfuzzer_net_spdy_session_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Undefined-shift
Crash Address: 
Crash State:
  net::HpackVarintDecoder::Resume
  bool net::HpackStringDecoder::StartDecodingLength<net::ValueDecoderListener>
  net::DecodeStatus net::HpackStringDecoder::Resume<net::ValueDecoderListener>
  
Sanitizer: undefined (UBSAN)

Regressed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_ubsan&range=449628:449664
Fixed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_ubsan&range=454694:454733

Reproducer Testcase: https://cluster-fuzz.appspot.com/download/AMIfv95cTDZ95t1AC22byQOMRxDBVMtEXBTIxf4L9qfEMMFgPRHWSjYSHG0EL0vULiXBzedUhbWNvBHSVE23i4CB6U63F18cIa2vV87Qyo0ywbkZJLZYPP70ZiOCSazf4bf8R89B_394w_yvyNrbDvGTq-aTZ3C6elp1uG3yMb231_cJIn0ubg38HR3F_lzFjci9EJJQymDHMxo7JWHBO0WHTzTQ769JU5xo-CVXga4PYPCsQdw6C3AYWEyA3fNA7mtOfSNAn2U_NTs1mxK7y27SNbyUaBbP_ZtU6_JcTvr9HlNJZU-XikRVcbgRXVG-U6dVI4m9uxSf84mNGdYsZE5IY9RmQ0TtcLgwJ3VEbYoyST8cYW5pYP123onet5CgFAdF0bMng6NbAjxmzcdYNZSHIPW_Ip00NA?testcase_id=5967113060876288


See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.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 5967113060876288 is verified as fixed, so closing issue.

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