[mac triage]

From the regression range I'm guessing r415181 "gn: Reduce stack memory use while parsing."

BUG= 641454 
Review-Url: https://codereview.chromium.org/2290713002


But also the test case is just a bunch of open curlies - maybe this is desired behavior.

I doubt that's a regression, that commit lowered stack use (due to another clusterfuzz bug about a stack overflow). But gn's parser will eventually stack overflow if things get too deep. In practice, this never happens.

A reasonable workaround would be to check the fuzzer for a bounded number of { before proceeding, I suppose.

ClusterFuzz has detected this issue as fixed in range 474926:474952.

Detailed report: https://clusterfuzz.com/testcase?key=4642324912275456

Fuzzer: libfuzzer_gn_parser_fuzzer
Job Type: mac_libfuzzer_chrome_asan
Platform Id: mac

Crash Type: Stack-overflow
Crash Address: 0x7fff5b5d3a88
Crash State:
  Parser::ParseBlock
  Parser::Block
  Parser::ParseExpression
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=mac_libfuzzer_chrome_asan&range=415152:415222
Fixed: https://clusterfuzz.com/revisions?job=mac_libfuzzer_chrome_asan&range=474926:474952

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4642324912275456


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 4642324912275456 is verified as fixed, so closing issue.

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