Debug log (from Nightly): ``` (c28.17e4): Break instruction exception - code 80000003 (first chance) *** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\WINDOWS\SYSTEM32\ntdll.dll - *** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\WINDOWS\System32\KERNEL32.DLL - eax=0113d000 ebx=00000000 ecx=77ba40c0 edx=77ba40c0 esi=77ba40c0 edi=77ba40c0 eip=77b70790 esp=01cdf880 ebp=01cdf8ac iopl=0 nv up ei pl zr na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246 ntdll!DbgBreakPoint: 77b70790 cc int 3 0:002> bp clearkey+000295d5 *** WARNING: Unable to verify checksum for c:\mozilla-source\mozilla-central\obj-i686-pc-mingw32\dist\bin\gmp-clearkey\0.1\clearkey.dll 0:002> g Breakpoint 0 hit eax=ffff0000 ebx=00000001 ecx=014c2814 edx=00000000 esi=0000a2c2 edi=00000000 eip=616395d5 esp=012ff474 ebp=012ff4c8 iopl=0 nv up ei pl nz na po nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000202 clearkey!ClearKeyDecryptor::Decrypt+0x85: 616395d5 034de8 add ecx,dword ptr [ebp-18h] ss:002b:012ff4b0=ffff0000 *** WARNING: Unable to verify checksum for c:\mozilla-source\mozilla-central\obj-i686-pc-mingw32\dist\bin\xul.dll 0:000> p eax=ffff0000 ebx=00000001 ecx=014b2814 edx=00000000 esi=0000a2c2 edi=00000000 eip=616395d8 esp=012ff474 ebp=012ff4c8 iopl=0 nv up ei pl nz na pe cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000207 clearkey!ClearKeyDecryptor::Decrypt+0x88: 616395d8 8b5508 mov edx,dword ptr [ebp+8] ss:002b:012ff4d0=014c27e8 0:000> p eax=ffff0000 ebx=00000001 ecx=014b2814 edx=014c27e8 esi=0000a2c2 edi=00000000 eip=616395db esp=012ff474 ebp=012ff4c8 iopl=0 nv up ei pl nz na pe cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000207 clearkey!ClearKeyDecryptor::Decrypt+0x8b: 616395db 03550c add edx,dword ptr [ebp+0Ch] ss:002b:012ff4d4=0000002b 0:000> p eax=ffff0000 ebx=00000001 ecx=014b2814 edx=014c2813 esi=0000a2c2 edi=00000000 eip=616395de esp=012ff474 ebp=012ff4c8 iopl=0 nv up ei pl nz ac po nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000212 clearkey!ClearKeyDecryptor::Decrypt+0x8e: 616395de 3bca cmp ecx,edx 0:000> p eax=ffff0000 ebx=00000001 ecx=014b2814 edx=014c2813 esi=0000a2c2 edi=00000000 eip=616395e0 esp=012ff474 ebp=012ff4c8 iopl=0 nv up ei ng nz na po cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000283 clearkey!ClearKeyDecryptor::Decrypt+0x90: 616395e0 7617 jbe clearkey!ClearKeyDecryptor::Decrypt+0xa9 (616395f9) [br=1] 0:000> p eax=ffff0000 ebx=00000001 ecx=014b2814 edx=014c2813 esi=0000a2c2 edi=00000000 eip=616395f9 esp=012ff474 ebp=012ff4c8 iopl=0 nv up ei ng nz na po cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000283 clearkey!ClearKeyDecryptor::Decrypt+0xa9: 616395f9 8b45e8 mov eax,dword ptr [ebp-18h] ss:002b:012ff4b0=ffff0000 0:000> p eax=ffff0000 ebx=00000001 ecx=014b2814 edx=014c2813 esi=0000a2c2 edi=00000000 eip=616395fc esp=012ff474 ebp=012ff4c8 iopl=0 nv up ei ng nz na po cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000283 clearkey!ClearKeyDecryptor::Decrypt+0xac: 616395fc 50 push eax 0:000> p eax=ffff0000 ebx=00000001 ecx=014b2814 edx=014c2813 esi=0000a2c2 edi=00000000 eip=616395fd esp=012ff470 ebp=012ff4c8 iopl=0 nv up ei ng nz na po cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000283 clearkey!ClearKeyDecryptor::Decrypt+0xad: 616395fd 8b4df8 mov ecx,dword ptr [ebp-8] ss:002b:012ff4c0=014c2814 0:000> p eax=ffff0000 ebx=00000001 ecx=014c2814 edx=014c2813 esi=0000a2c2 edi=00000000 eip=61639600 esp=012ff470 ebp=012ff4c8 iopl=0 nv up ei ng nz na po cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000283 clearkey!ClearKeyDecryptor::Decrypt+0xb0: 61639600 51 push ecx 0:000> p eax=ffff0000 ebx=00000001 ecx=014c2814 edx=014c2813 esi=0000a2c2 edi=00000000 eip=61639601 esp=012ff46c ebp=012ff4c8 iopl=0 nv up ei ng nz na po cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000283 clearkey!ClearKeyDecryptor::Decrypt+0xb1: 61639601 8b55e4 mov edx,dword ptr [ebp-1Ch] ss:002b:012ff4ac=014c28c8 0:000> p eax=ffff0000 ebx=00000001 ecx=014c2814 edx=014c28c8 esi=0000a2c2 edi=00000000 eip=61639604 esp=012ff46c ebp=012ff4c8 iopl=0 nv up ei ng nz na po cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000283 clearkey!ClearKeyDecryptor::Decrypt+0xb4: 61639604 52 push edx 0:000> p eax=ffff0000 ebx=00000001 ecx=014c2814 edx=014c28c8 esi=0000a2c2 edi=00000000 eip=61639605 esp=012ff468 ebp=012ff4c8 iopl=0 nv up ei ng nz na po cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000283 clearkey!ClearKeyDecryptor::Decrypt+0xb5: 61639605 e802c00100 call clearkey!memcpy (6165560c) 0:000> dd @esp 012ff468 014c28c8 014c2814 ffff0000 012ff492 012ff478 014b2cc0 012ff488 014c28c8 014c28f3 012ff488 014c28f3 61635832 014ca1d8 012ff4a0 012ff498 014b2cb8 014ca1e8 012ff4b0 61635665 012ff4a8 014ca1e8 014c28c8 ffff0000 616351d0 012ff4b8 014ca1d8 00000000 014c2814 012ff4e0 012ff4c8 012ff4e0 61639533 014c27e8 0000002b 012ff4d8 014bb410 014d0648 012ff4f8 616394d7 0:000> !teb TEB at 01137000 ExceptionList: 012ffb70 StackBase: 01300000 StackLimit: 012fd000 SubSystemTib: 00000000 FiberData: 00001e00 ArbitraryUserPointer: 00000000 Self: 01137000 EnvironmentPointer: 00000000 ClientId: 00000c28 . 000013f4 RpcHandle: 00000000 Tls Storage: 014a7e88 PEB Address: 01134000 LastErrorValue: 0 LastStatusValue: c0000034 Count Owned Locks: 0 HardErrorMode: 0 0:000> p (c28.13f4): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=014b2814 ebx=00000001 ecx=fffd88c8 edx=ffff0000 esi=014d9f4c edi=014da000 eip=71abcf5e esp=012ff45c ebp=012ff4c8 iopl=0 nv up ei ng nz na po cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010283 VCRUNTIME140!memcpy+0x4e: 71abcf5e f3a4 rep movs byte ptr es:[edi],byte ptr [esi] 0:000> kb # ChildEBP RetAddr Args to Child 00 012ff460 6163960a 014c28c8 014c2814 ffff0000 VCRUNTIME140!memcpy+0x4e [f:\dd\vctools\crt\vcruntime\src\string\i386\memcpy.asm @ 194] 01 012ff4c8 61639533 014c27e8 0000002b 014bb410 clearkey!ClearKeyDecryptor::Decrypt+0xba [c:\mozilla-source\mozilla-central\media\gmp-clearkey\0.1\clearkeydecryptionmanager.cpp @ 218] 02 012ff4e0 616394d7 014c27e8 0000002b 014bb410 clearkey!ClearKeyDecryptionManager::Decrypt+0x43 [c:\mozilla-source\mozilla-central\media\gmp-clearkey\0.1\clearkeydecryptionmanager.cpp @ 172] 03 012ff4f8 61639131 014bb3f8 014bb410 00000000 clearkey!ClearKeyDecryptionManager::Decrypt+0x27 [c:\mozilla-source\mozilla-central\media\gmp-clearkey\0.1\clearkeydecryptionmanager.cpp @ 152] 04 012ff568 61639c31 012ff594 012ff5ec 014d05e8 clearkey!VideoDecoder::Decode+0x111 [c:\mozilla-source\mozilla-central\media\gmp-clearkey\0.1\videodecoder.cpp @ 93] 05 012ff57c 684265c5 012ff594 012ff5ec 76ee6304 clearkey!ClearKeyCDM::DecryptAndDecodeFrame+0x21 [c:\mozilla-source\mozilla-central\media\gmp-clearkey\0.1\clearkeycdm.cpp @ 157] 06 012ff628 684083aa 015191f0 00000000 6f7ecf78 xul!mozilla::WidevineVideoDecoder::Decode+0x225 [c:\mozilla-source\mozilla-central\dom\media\gmp\widevine-adapter\widevinevideodecoder.cpp @ 134] 07 012ff65c 65b3ef20 012ff7c2 012ff678 012ff7db xul!mozilla::gmp::GMPVideoDecoderChild::RecvDecode+0xba [c:\mozilla-source\mozilla-central\dom\media\gmp\gmpvideodecoderchild.cpp @ 149] 08 012ff8b4 65b1b395 015146a0 01511000 01300220 xul!mozilla::gmp::PGMPVideoDecoderChild::OnMessageReceived+0x880 [c:\mozilla-source\mozilla-central\obj-i686-pc-mingw32\ipc\ipdl\pgmpvideodecoderchild.cpp @ 412] 09 012ff988 65a10136 015146a0 015550f4 00000000 xul!mozilla::gmp::PGMPContentChild::OnMessageReceived+0x55 [c:\mozilla-source\mozilla-central\obj-i686-pc-mingw32\ipc\ipdl\pgmpcontentchild.cpp @ 180] 0a 012ff9b8 65a10950 015146a0 015550b8 012f0000 xul!mozilla::ipc::MessageChannel::DispatchAsyncMessage+0xe6 [c:\mozilla-source\mozilla-central\ipc\glue\messagechannel.cpp @ 1795] 0b 012ffa14 65a1f773 015146a0 01501040 015770a0 xul!mozilla::ipc::MessageChannel::DispatchMessageW+0x1b0 [c:\mozilla-source\mozilla-central\ipc\glue\messagechannel.cpp @ 1732] 0c 012ffa40 65a1e667 01514670 012ffa78 012ffa5c xul!mozilla::ipc::MessageChannel::RunMessage+0x243 [c:\mozilla-source\mozilla-central\ipc\glue\messagechannel.cpp @ 1604] 0d 012ffa58 659c9f7c 01514670 012ffa88 012ffa7c xul!mozilla::ipc::MessageChannel::MessageTask::Run+0x97 [c:\mozilla-source\mozilla-central\ipc\glue\messagechannel.cpp @ 1637] 0e 012ffa80 659c195a 00000000 012ffc5c 012ffac0 xul!MessageLoop::RunTask+0x5c [c:\mozilla-source\mozilla-central\ipc\chromium\src\base\message_loop.cc @ 359] 0f 012ffa90 659c1fb2 012ffa9c 00000000 01564000 xul!MessageLoop::DeferOrRunPendingTask+0x3a [c:\mozilla-source\mozilla-central\ipc\chromium\src\base\message_loop.cc @ 369] 10 012ffac0 659c9b74 01134000 e436b6d4 012ffaec xul!MessageLoop::DoWork+0xd2 [c:\mozilla-source\mozilla-central\ipc\chromium\src\base\message_loop.cc @ 441] 11 012ffb24 659c9efd 012ffc5c 012ffba0 6a10c544 xul!base::MessagePumpDefault::Run+0x94 [c:\mozilla-source\mozilla-central\ipc\chromium\src\base\message_pump_default.cc @ 36] 12 012ffb48 659c9e72 e436b784 76ee6304 01501040 xul!MessageLoop::RunInternal+0x4d [c:\mozilla-source\mozilla-central\ipc\chromium\src\base\message_loop.cc @ 239] 13 012ffb80 659c9a6d 00000001 00ffff00 00000000 xul!MessageLoop::RunHandler+0x82 [c:\mozilla-source\mozilla-central\ipc\chromium\src\base\message_loop.cc @ 232] 14 012ffba0 6a10d426 00000000 01510100 00000000 xul!MessageLoop::Run+0x1d [c:\mozilla-source\mozilla-central\ipc\chromium\src\base\message_loop.cc @ 212] 15 012ffd08 6a121988 00000004 01501040 012ffd34 xul!XRE_InitChildProcess+0x8d6 [c:\mozilla-source\mozilla-central\toolkit\xre\nsembedfunctions.cpp @ 688] 16 012ffd20 00e2f1e4 00000007 01501040 012ffd34 xul!mozilla::BootstrapImpl::XRE_InitChildProcess+0x18 [c:\mozilla-source\mozilla-central\toolkit\xre\bootstrap.cpp @ 65] 17 012ffd44 00e2efd3 01510070 00000007 01501040 plugin_container!content_process_main+0xa4 [c:\mozilla-source\mozilla-central\ipc\contentproc\plugin-container.cpp @ 64] 18 012ffd64 00e2f891 00000008 01501040 76ee6314 plugin_container!NS_internal_main+0x53 [c:\mozilla-source\mozilla-central\ipc\app\mozillaruntimemain.cpp @ 25] 19 012ffd98 00ecad22 00000008 014b58b8 014b5b48 plugin_container!wmain+0x121 [c:\mozilla-source\mozilla-central\toolkit\xre\nswindowswmain.cpp @ 111] 1a (Inline) -------- -------- -------- -------- plugin_container!invoke_main+0x1d [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl @ 79] 1b 012ffde0 749c62c4 01134000 749c62a0 cfa7c398 plugin_container!__scrt_common_main_seh+0xf9 [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl @ 253] 1c 012ffdf4 77b60fd9 01134000 6e981b92 00000000 KERNEL32!BaseThreadInitThunk+0x24 1d 012ffe3c 77b60fa4 ffffffff 77b82f0e 00000000 ntdll!__RtlUserThreadStart+0x2f 1e 012ffe4c 00000000 00e266d1 01134000 00000000 ntdll!_RtlUserThreadStart+0x1b 0:000> dd @edi 014da000 ???????? ???????? ???????? ???????? 014da010 ???????? ???????? ???????? ???????? 014da020 ???????? ???????? ???????? ???????? 014da030 ???????? ???????? ???????? ???????? 014da040 ???????? ???????? ???????? ???????? 014da050 ???????? ???????? ???????? ???????? 014da060 ???????? ???????? ???????? ???????? 014da070 ???????? ???????? ???????? ???????? 0:000> vertarget Windows 10 Version 14393 MP (4 procs) Free x86 compatible Product: WinNt, suite: SingleUserTS kernelbase.dll version: 10.0.14393.479 (rs1_release.161110-2025) Machine Name: Debug session time: Tue Feb 7 17:46:54.521 2017 (UTC - 6:00) System Uptime: 0 days 1:32:28.968 Process Uptime: 0 days 0:04:17.677 Kernel time: 0 days 0:00:00.000 User time: 0 days 0:00:00.031 ```