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Issue 804714 link

Starred by 1 user

Issue metadata

Status: Duplicate
Merged: issue 802258
Owner: ----
Closed: Jan 2018
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: 1
Type: Bug



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Timeout in net_parse_data_url_fuzzer

Project Member Reported by ClusterFuzz, Jan 23 2018

Issue description

Detailed report: https://clusterfuzz.com/testcase?key=5499012487839744

Fuzzer: libFuzzer_net_parse_data_url_fuzzer
Job Type: libfuzzer_chrome_asan
Platform Id: linux

Crash Type: Timeout (exceeds 25 secs)
Crash Address: 
Crash State:
  net_parse_data_url_fuzzer
  
Sanitizer: address (ASAN)

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5499012487839744

Issue filed automatically.

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

Note: This crash might not be reproducible with the provided testcase. That said, for the past 14 days we've been seeing this crash frequently. If you are unable to reproduce this, please try a speculative fix based on the crash stacktrace in the report. The fix can be verified by looking at the crash statistics in the report, a day after the fix is deployed. We will auto-close the bug if the crash is not seen for 14 days.
 
Cc: brajkumar@chromium.org
Components: Tools>Stability>ClusterFuzz
Labels: Test-Predator-Wrong CF-NeedsTriage
Unable to find actual suspect through code search and also from the provided CL, hence adding appropriate label and marking it as untriaged.

Thanks!
Components: -Tools>Stability>ClusterFuzz Internals>Network

Comment 3 by eroman@chromium.org, Jan 29 2018

Mergedinto: 802258
Status: Duplicate (was: Untriaged)
Samples: 34K of event 'cycles', Event count (approx.): 30227466843                                                                                  
  Children      Self  Command          Shared Object               Symbol                                                                           
+   99.65%     0.00%  net_parse_data_  net_parse_da [.] fuzzer::FuzzerDriver                                                         
+   99.65%     0.00%  net_parse_data_  net_parse_da [.] main                                                                         
+   99.65%     0.00%  net_parse_data_  libc-2.24.so [.] __libc_start_main                                                            
+   99.65%     0.00%  net_parse_data_  [unknown]    [k] 0xd07e258d4c544155                                                           
+   99.51%     0.00%  net_parse_data_  net_parse_da [.] fuzzer::RunOneTest                                                           
+   99.34%     0.00%  net_parse_data_  net_parse_da [.] fuzzer::Fuzzer::ExecuteCallback                                              
+   99.34%     0.00%  net_parse_data_  net_parse_da [.] LLVMFuzzerTestOneInput                                                       
+   99.17%     0.00%  net_parse_data_  liburl.so    [.] url::(anonymous namespace)::DoCanonicalize<char>                             
+   99.17%     0.00%  net_parse_data_  liburl.so    [.] url::Canonicalize                                                            
+   99.17%     0.00%  net_parse_data_  liburl.so    [.] GURL::InitCanonical<std::__1::basic_string<char, std::__1::char_traits<char>,
+   99.17%     0.00%  net_parse_data_  liburl.so    [.] GURL::GURL                                                                   
+   98.17%     0.00%  net_parse_data_  liburl.so    [.] url::(anonymous namespace)::DoCanonicalizeStandardURL<char, unsigned char>   
+   98.16%     0.00%  net_parse_data_  liburl.so    [.] url::(anonymous namespace)::DoHostSubstring<char, unsigned char>             
+   98.16%     0.00%  net_parse_data_  liburl.so    [.] url::(anonymous namespace)::DoHost<char, unsigned char>                      
+   98.16%     0.00%  net_parse_data_  liburl.so    [.] url::CanonicalizeHost                                                        
+   98.16%     0.00%  net_parse_data_  liburl.so    [.] url::CanonicalizeStandardURL                                                 
+   98.04%     0.00%  net_parse_data_  liburl.so    [.] url::(anonymous namespace)::DoComplexHost                                    
+   96.94%     0.00%  net_parse_data_  liburl.so    [.] url::(anonymous namespace)::DoIDNHost                                        
+   95.76%     0.00%  net_parse_data_  liburl.so    [.] url::IDNToASCII                                                              
+   95.75%     0.00%  net_parse_data_  libicuuc.so  [.] uidna_nameToASCII_60                                                         
+   95.73%     0.00%  net_parse_data_  libicuuc.so  [.] icu_60::UTS46::process                                                       
+   95.73%     0.00%  net_parse_data_  libicuuc.so  [.] icu_60::UTS46::nameToASCII                                                   
+   95.67%     0.11%  net_parse_data_  libicuuc.so  [.] icu_60::UTS46::processUnicode                                                
+   93.17%     0.12%  net_parse_data_  libicuuc.so  [.] icu_60::UTS46::mapDevChars                                                   
+   67.15%     0.01%  net_parse_data_  libicuuc.so  [.] icu_60::UnicodeString::getBuffer                                             
+   67.12%     0.01%  net_parse_data_  libicuuc.so  [.] icu_60::UnicodeString::cloneArrayIfNeeded                                    
+   40.09%    15.92%  net_parse_data_  libc-2.24.so [.] __memset_sse2_unaligned_erms                                                 
+   34.23%    34.12%  net_parse_data_  libc-2.24.so [.] __memmove_sse2_unaligned_erms                                                
+   30.00%     0.00%  net_parse_data_  libbase.so   [.] tc_malloc                                                                    
+   30.00%     0.00%  net_parse_data_  libbase.so   [.] (anonymous namespace)::TCMalloc                                              
+   29.99%     0.00%  net_parse_data_  libbase.so   [.] do_debug_malloc_or_debug_cpp_alloc                                           
+   29.99%     0.01%  net_parse_data_  libbase.so   [.] MallocBlock::Allocate                                                        
+   29.99%     0.00%  net_parse_data_  libbase.so   [.] DebugAllocate                                                                
+   29.74%     0.00%  net_parse_data_  libbase.so   [.] ShimMalloc                                                                   
+   29.74%     0.00%  net_parse_data_  libbase.so   [.] malloc 

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