https://logs.chromium.org/v/?s=chromium%2Fbb%2Fchromium.clang%2FCrWinAsan%2F339%2F%2B%2Frecipes%2Fsteps%2Fcontent_browsertests%2F0%2Flogs%2FParallelDownloadTest.ResumptionLastSliceUnfinished%2F0


=================================================================
==3536==ERROR: AddressSanitizer: stack-buffer-underflow on address 0x2585eb8f at pc 0x11a0b772 bp 0x2585eaf4 sp 0x2585eae4
READ of size 1 at 0x2585eb8f thread T22
==3536==*** WARNING: Failed to initialize DbgHelp!              ***
==3536==*** Most likely this means that the app is already      ***
==3536==*** using DbgHelp, possibly with incompatible flags.    ***
==3536==*** Due to technical reasons, symbolization might crash ***
==3536==*** or produce wrong results.                           ***
    #0 0x11a0b78c in __asan_memmove c:\b\c\b\crwinasan\src\third_party\llvm\projects\compiler-rt\lib\asan\asan_interceptors_memintrinsics.cc:31
    #1 0xa41b43 in std::basic_string<char,std::char_traits<char>,std::allocator<char> >::assign+0xf3 (e:\b\s\w\ir\out\Release\content_browsertests.exe+0x401b43)
    #2 0x74871c6 in content::TestDownloadHttpResponse::GetPatternBytes C:\b\c\b\CrWinAsan\src\content\public\test\test_download_http_response.cc:298
    #3 0x748772c in content::TestDownloadHttpResponse::GetResponseBody C:\b\c\b\CrWinAsan\src\content\public\test\test_download_http_response.cc:333
    #4 0x7487bac in content::TestDownloadHttpResponse::SendResponse C:\b\c\b\CrWinAsan\src\content\public\test\test_download_http_response.cc:358
    #5 0x774ddf8 in net::test_server::EmbeddedTestServer::HandleRequest C:\b\c\b\CrWinAsan\src\net\test\embedded_test_server\embedded_test_server.cc:236
    #6 0x775305d in base::internal::FunctorTraits<void (net::test_server::EmbeddedTestServer::*)(net::test_server::HttpConnection *, std::unique_ptr<net::test_server::HttpRequest,std::default_delete<net::test_server::HttpRequest> >) __attribute__((thiscall)),void>::Invoke<net::test_server::EmbeddedTestServer *,net::test_server::HttpConnection *,std::unique_ptr<net::test_server::HttpRequest,std::default_delete<net::test_server::HttpRequest> > > C:\b\c\b\CrWinAsan\src\base\bind_internal.h:447
    #7 0x7752e45 in base::internal::Invoker<base::internal::BindState<void (net::test_server::EmbeddedTestServer::*)(net::test_server::HttpConnection *, std::unique_ptr<net::test_server::HttpRequest,std::default_delete<net::test_server::HttpRequest> >) __attribute__((thiscall)),base::internal::UnretainedWrapper<net::test_server::EmbeddedTestServer> >,void (net::test_server::HttpConnection *, std::unique_ptr<net::test_server::HttpRequest,std::default_delete<net::test_server::HttpRequest> >)>::Run C:\b\c\b\CrWinAsan\src\base\bind_internal.h:586
    #8 0x7784853 in net::test_server::HttpConnection::ConsumeData C:\b\c\b\CrWinAsan\src\net\test\embedded_test_server\http_connection.cc:46
    #9 0x775082d in net::test_server::EmbeddedTestServer::HandleReadResult C:\b\c\b\CrWinAsan\src\net\test\embedded_test_server\embedded_test_server.cc:446
    #10 0x7750722 in net::test_server::EmbeddedTestServer::OnReadCompleted C:\b\c\b\CrWinAsan\src\net\test\embedded_test_server\embedded_test_server.cc:431
    #11 0xed0a339 in base::internal::Invoker<base::internal::BindState<void (content::PepperDeviceEnumerationHostHelper::*)(unsigned int, const std::vector<ppapi::DeviceRefData,std::allocator<ppapi::DeviceRefData> > &) __attribute__((thiscall)),base::internal::UnretainedWrapper<content::PepperDeviceEnumerationHostHelper>,unsigned int>,void (const std::vector<ppapi::DeviceRefData,std::allocator<ppapi::DeviceRefData> > &)>::Run C:\b\c\b\CrWinAsan\src\base\bind_internal.h:586
    #12 0x84ae08a in net::TCPClientSocket::DidCompleteRead C:\b\c\b\CrWinAsan\src\net\socket\tcp_client_socket.cc:371
    #13 0x8a71787 in base::internal::Invoker<base::internal::BindState<void (net::SOCKS5ClientSocket::*)(const base::RepeatingCallback<void (int)> &, int) __attribute__((thiscall)),base::internal::UnretainedWrapper<net::SOCKS5ClientSocket>,base::RepeatingCallback<void (int)> >,void (int)>::Run C:\b\c\b\CrWinAsan\src\base\bind_internal.h:586
    #14 0x84ab2a0 in net::TCPSocketWin::RetryRead C:\b\c\b\CrWinAsan\src\net\socket\tcp_socket_win.cc:906
    #15 0x8b253c1 in base::internal::Invoker<base::internal::BindState<void (net::HttpProxyClientSocket::*)(int) __attribute__((thiscall)),base::internal::UnretainedWrapper<net::HttpProxyClientSocket> >,void (int)>::Run C:\b\c\b\CrWinAsan\src\base\bind_internal.h:586
    #16 0x84a719e in net::TCPSocketWin::DidSignalRead C:\b\c\b\CrWinAsan\src\net\socket\tcp_socket_win.cc:1012
    #17 0x84a6bb6 in net::TCPSocketWin::Core::ReadDelegate::OnObjectSignaled C:\b\c\b\CrWinAsan\src\net\socket\tcp_socket_win.cc:221
    #18 0x812c388 in base::win::ObjectWatcher::Signal C:\b\c\b\CrWinAsan\src\base\win\object_watcher.cc:110
    #19 0x2bf592f in base::internal::Invoker<base::internal::BindState<void (media::SerialRunner::*)(media::PipelineStatus) __attribute__((thiscall)),base::WeakPtr<media::SerialRunner>,media::PipelineStatus>,void ()>::Run+0x7f (e:\b\s\w\ir\out\Release\content_browsertests.exe+0x25b592f)
    #20 0x8182e71 in base::debug::TaskAnnotator::RunTask C:\b\c\b\CrWinAsan\src\base\debug\task_annotator.cc:55
    #21 0x8205562 in base::internal::IncomingTaskQueue::RunTask C:\b\c\b\CrWinAsan\src\base\message_loop\incoming_task_queue.cc:124
    #22 0x800c66a in base::MessageLoop::RunTask+0x71a (e:\b\s\w\ir\out\Release\content_browsertests.exe+0x79cc66a)
    #23 0x800d7b5 in base::MessageLoop::DeferOrRunPendingTask+0x95 (e:\b\s\w\ir\out\Release\content_browsertests.exe+0x79cd7b5)
    #24 0x800dc31 in base::MessageLoop::DoWork+0x371 (e:\b\s\w\ir\out\Release\content_browsertests.exe+0x79cdc31)
    #25 0x81a4c28 in base::MessagePumpForIO::DoRunLoop C:\b\c\b\CrWinAsan\src\base\message_loop\message_pump_win.cc:475
    #26 0x81a207c in base::MessagePumpWin::Run C:\b\c\b\CrWinAsan\src\base\message_loop\message_pump_win.cc:56
    #27 0x800b8e3 in base::MessageLoop::Run+0x73 (e:\b\s\w\ir\out\Release\content_browsertests.exe+0x79cb8e3)
    #28 0x7fcab80 in base::RunLoop::Run C:\b\c\b\CrWinAsan\src\base\run_loop.cc:133
    #29 0x810055a in base::Thread::Run C:\b\c\b\CrWinAsan\src\base\threading\thread.cc:255
    #30 0x81009f6 in base::Thread::ThreadMain C:\b\c\b\CrWinAsan\src\base\threading\thread.cc:338
    #31 0x7fddcab in base::`anonymous namespace'::ThreadFunc C:\b\c\b\CrWinAsan\src\base\threading\platform_thread_win.cc:91
    #32 0x11a05141 in __asan::AsanThread::ThreadStart c:\b\c\b\crwinasan\src\third_party\llvm\projects\compiler-rt\lib\asan\asan_thread.cc:259
    #33 0x11a03dcd in asan_thread_start c:\b\c\b\crwinasan\src\third_party\llvm\projects\compiler-rt\lib\asan\asan_win.cc:136
    #34 0x76183389 in BaseThreadInitThunk+0x11 (C:\Windows\syswow64\kernel32.dll+0x7dd73389)
    #35 0x77559901 in RtlInitializeExceptionChain+0x62 (C:\Windows\SysWOW64\ntdll.dll+0x7dea9901)
    #36 0x775598d4 in RtlInitializeExceptionChain+0x35 (C:\Windows\SysWOW64\ntdll.dll+0x7dea98d4)
Address 0x2585eb8f is located in stack of thread T22 at offset 15 in frame
    #0 0x7486f6f in content::TestDownloadHttpResponse::GetPatternBytes C:\b\c\b\CrWinAsan\src\content\public\test\test_download_http_response.cc:289
  This frame has 2 object(s):
    [16, 24) 'data' (line 294) <== Memory access at offset 15 underflows this variable
    [48, 72) 'string_to_append' (line 298)
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp, SEH and C++ exceptions *are* supported)
Thread T22 created by T0 here:
    #0 0x11a03ed2 in __asan_wrap_CreateThread c:\b\c\b\crwinasan\src\third_party\llvm\projects\compiler-rt\lib\asan\asan_win.cc:146
    #1 0x7fdd4cc in base::`anonymous namespace'::CreateThreadInternal C:\b\c\b\CrWinAsan\src\base\threading\platform_thread_win.cc:130
    #2 0x7fdd3a3 in base::PlatformThread::CreateWithPriority C:\b\c\b\CrWinAsan\src\base\threading\platform_thread_win.cc:209
    #3 0x80ffb9b in base::Thread::StartWithOptions C:\b\c\b\CrWinAsan\src\base\threading\thread.cc:112
    #4 0x774b813 in net::test_server::EmbeddedTestServer::StartAcceptingConnections C:\b\c\b\CrWinAsan\src\net\test\embedded_test_server\embedded_test_server.cc:176
    #5 0x774a1ef in net::test_server::EmbeddedTestServer::Start C:\b\c\b\CrWinAsan\src\net\test\embedded_test_server\embedded_test_server.cc:93
    #6 0xcd7c79 in content::`anonymous namespace'::DownloadContentTest::SetUpOnMainThread C:\b\c\b\CrWinAsan\src\content\browser\download\download_browsertest.cc:725
    #7 0x74ad39f in content::BrowserTestBase::ProxyRunTestOnMainThreadLoop C:\b\c\b\CrWinAsan\src\content\public\test\browser_test_base.cc:344
    #8 0x75af9d7 in content::ShellBrowserMainParts::PreMainMessageLoopRun C:\b\c\b\CrWinAsan\src\content\shell\browser\shell_browser_main_parts.cc:208
    #9 0x3838458 in content::BrowserMainLoop::PreMainMessageLoopRun+0x168 (e:\b\s\w\ir\out\Release\content_browsertests.exe+0x31f8458)
    #10 0x4681e87 in content::StartupTaskRunner::RunAllTasksNow C:\b\c\b\CrWinAsan\src\content\browser\startup_task_runner.cc:45
    #11 0x3832fa3 in content::BrowserMainLoop::CreateStartupTasks C:\b\c\b\CrWinAsan\src\content\browser\browser_main_loop.cc:986
    #12 0x384253f in content::BrowserMainRunnerImpl::Initialize C:\b\c\b\CrWinAsan\src\content\browser\browser_main_runner.cc:139
    #13 0xf6b3829 in ShellBrowserMain C:\b\c\b\CrWinAsan\src\content\shell\browser\shell_browser_main.cc:23
    #14 0xf6b0b27 in content::ShellMainDelegate::RunProcess C:\b\c\b\CrWinAsan\src\content\shell\app\shell_main_delegate.cc:322
    #15 0x34aef7a in content::RunNamedProcessTypeMain C:\b\c\b\CrWinAsan\src\content\app\content_main_runner.cc:410
    #16 0x34b0388 in content::ContentMainRunnerImpl::Run C:\b\c\b\CrWinAsan\src\content\app\content_main_runner.cc:713
    #17 0xb5547dc in service_manager::Main C:\b\c\b\CrWinAsan\src\services\service_manager\embedder\main.cc:456
    #18 0x34aedc5 in content::ContentMain C:\b\c\b\CrWinAsan\src\content\app\content_main.cc:19
    #19 0x74ac767 in content::BrowserTestBase::SetUp C:\b\c\b\CrWinAsan\src\content\public\test\browser_test_base.cc:309
    #20 0x743d947 in content::ContentBrowserTest::SetUp C:\b\c\b\CrWinAsan\src\content\public\test\content_browser_test.cc:89
    #21 0x1bb6fb1 in testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,void> C:\b\c\b\CrWinAsan\src\third_party\googletest\src\googletest\src\gtest.cc:2451
    #22 0x1bb6ac1 in testing::Test::Run C:\b\c\b\CrWinAsan\src\third_party\googletest\src\googletest\src\gtest.cc:2463
    #23 0x1bb8e4c in testing::TestInfo::Run C:\b\c\b\CrWinAsan\src\third_party\googletest\src\googletest\src\gtest.cc:2645
    #24 0x1bb9eed in testing::TestCase::Run C:\b\c\b\CrWinAsan\src\third_party\googletest\src\googletest\src\gtest.cc:2763
    #25 0x1bca58a in testing::internal::UnitTestImpl::RunAllTests C:\b\c\b\CrWinAsan\src\third_party\googletest\src\googletest\src\gtest.cc:4638
    #26 0x1bc9d01 in testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,bool> C:\b\c\b\CrWinAsan\src\third_party\googletest\src\googletest\src\gtest.cc:2451
    #27 0x1bc99f9 in testing::UnitTest::Run C:\b\c\b\CrWinAsan\src\third_party\googletest\src\googletest\src\gtest.cc:4250
    #28 0x753032e in base::TestSuite::Run C:\b\c\b\CrWinAsan\src\base\test\test_suite.cc:272
    #29 0xf698aad in content::ContentTestLauncherDelegate::RunTestSuite C:\b\c\b\CrWinAsan\src\content\test\content_test_launcher.cc:108
    #30 0x74b126c in content::LaunchTests+0x3fc (e:\b\s\w\ir\out\Release\content_browsertests.exe+0x6e7126c)
    #31 0xf698976 in main C:\b\c\b\CrWinAsan\src\content\test\content_test_launcher.cc:138
    #32 0x11a1f679 in __scrt_common_main_seh f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283
    #33 0x76183389 in BaseThreadInitThunk+0x11 (C:\Windows\syswow64\kernel32.dll+0x7dd73389)
    #34 0x77559901 in RtlInitializeExceptionChain+0x62 (C:\Windows\SysWOW64\ntdll.dll+0x7dea9901)
    #35 0x775598d4 in RtlInitializeExceptionChain+0x35 (C:\Windows\SysWOW64\ntdll.dll+0x7dea98d4)
SUMMARY: AddressSanitizer: stack-buffer-underflow c:\b\c\b\crwinasan\src\third_party\llvm\projects\compiler-rt\lib\asan\asan_interceptors_memintrinsics.cc:31 in __asan_memmove
Shadow bytes around the buggy address:
  0x34b0bd20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x34b0bd30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x34b0bd40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x34b0bd50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x34b0bd60: f1 f1 01 f3 00 00 00 00 00 00 00 00 00 00 00 00
=>0x34b0bd70: f1[f1]00 f2 f2 f2 00 00 00 f3 f3 f3 f3 f3 00 00
  0x34b0bd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x34b0bd90: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f8 f8
  0x34b0bda0: f8 f2 f2 f2 f2 f2 00 00 00 f2 f2 f2 f2 f2 00 00
  0x34b0bdb0: 00 f2 f2 f2 f2 f2 f8 f8 f8 f2 f2 f2 f2 f2 00 00
  0x34b0bdc0: 00 f2 f2 f2 f2 f2 f8 f2 f8 f8 f2 f2 f8 f2 f8 f3
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==3536==ABORTING


Looks like this is a new test from https://chromium-review.googlesource.com/c/chromium/src/+/910688