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Unhandled exception at 0x00007FF836A36FB1 (xul.dll) in firefox.exe: 0xC0000005: Access violation reading location 0x0000029F7A02DFDC.

Hi Mozilla, I am experiencing repeated crashes when opening Firefox (both standard and developer versions). The crash happens within 30 seconds of opening Firefox. The be… (tuilleadh eolais)

Hi Mozilla,

I am experiencing repeated crashes when opening Firefox (both standard and developer versions). The crash happens within 30 seconds of opening Firefox. The behavior just before the crash involves a slight hang, and then a crash.

I am able to debug with Visual Studio, and can see the following error message: Unhandled exception at 0x00007FF836A36FB1 (xul.dll) in firefox.exe: 0xC0000005: Access violation reading location 0x0000029F7A02DFDC.

I have tried many, many avenues, including: - Freshly reinstalling Windows 10 Enterprise - Running Firefox as Admin - Starting Firefox in Safe Mode - Refreshing Firefox - Reinstalling Firefox - Disabling/Enabling hw acceleration - Running a malware scan - Installing all necessary Windows updates

If I have some time, I will likely get the latest source and run it locally in debug. However, I am a C# dev, and not a C++ dev, so it may not be all that helpful.

Firefox Details: v62.0

PC Details: i7-7700K GTX 1080 16GB DDR4 @ 3200 Samsung Evo 960 EVO

The Firefox AppData folder is empty, and I am unable to find a proper crash report for you, but I do have a disassembly from Visual Studio. It seems to be crashing in _sk_gather_bgra_hsw().

Any help would be greatly appreciated!

Please let me know if you need any further info.

Cheers, Keagan

Disassembly info:

Unhandled exception at 0x00007FF836A36FB1 (xul.dll) in firefox.exe: 0xC0000005: Access violation reading location 0x0000029F7A02DFDC.

Breakpoint: 00007FF8222A2FB1 vpgatherdd ymm8,dword ptr [r8+ymm0*4],ymm3

DISASSEMBLY (Address: _sk_gather_bgra_hsw()):

00007FF8222A2F07  ?? ?? 00007FF8222A2F08  ?? ?? 00007FF8222A2F09  ?? ?? 00007FF8222A2F0A  ?? ?? 00007FF8222A2F0B  ?? ?? 00007FF8222A2F0C  ?? ?? 00007FF8222A2F0D  ?? ?? 00007FF8222A2F0E  ?? ?? 00007FF8222A2F0F  ?? ?? 00007FF8222A2F10  ?? ?? 00007FF8222A2F11  ?? ?? 00007FF8222A2F12  ?? ?? 00007FF8222A2F13  ?? ?? 00007FF8222A2F14  ?? ?? 00007FF8222A2F15  ?? ?? 00007FF8222A2F16  ?? ?? 00007FF8222A2F17  ?? ?? 00007FF8222A2F18  ?? ?? 00007FF8222A2F19  ?? ?? 00007FF8222A2F1A  ?? ?? 00007FF8222A2F1B  ?? ?? 00007FF8222A2F1C  ?? ?? 00007FF8222A2F1D  ?? ?? 00007FF8222A2F1E  ?? ?? 00007FF8222A2F1F  ?? ?? 00007FF8222A2F20  ?? ?? 00007FF8222A2F21  ?? ?? 00007FF8222A2F22  ?? ?? 00007FF8222A2F23  ?? ?? 00007FF8222A2F24  ?? ?? 00007FF8222A2F25  ?? ?? 00007FF8222A2F26  ?? ?? 00007FF8222A2F27  ?? ?? 00007FF8222A2F28  ?? ?? 00007FF8222A2F29  ?? ?? 00007FF8222A2F2A  ?? ?? 00007FF8222A2F2B  ?? ?? 00007FF8222A2F2C  ?? ?? 00007FF8222A2F2D  ?? ?? 00007FF8222A2F2E  ?? ?? 00007FF8222A2F2F  ?? ?? 00007FF8222A2F30  ?? ?? 00007FF8222A2F31  ?? ?? 00007FF8222A2F32  ?? ?? 00007FF8222A2F33  ?? ?? 00007FF8222A2F34  ?? ?? 00007FF8222A2F35  ?? ?? 00007FF8222A2F36  ?? ?? 00007FF8222A2F37  ?? ?? 00007FF8222A2F38  ?? ?? 00007FF8222A2F39  ?? ?? 00007FF8222A2F3A  ?? ?? 00007FF8222A2F3B  ?? ?? 00007FF8222A2F3C  ?? ?? 00007FF8222A2F3D  ?? ?? 00007FF8222A2F3E  ?? ?? 00007FF8222A2F3F  ?? ?? 00007FF8222A2F40  ?? ?? 00007FF8222A2F41  ?? ?? 00007FF8222A2F42  ?? ?? 00007FF8222A2F43  ?? ?? 00007FF8222A2F44  ?? ?? 00007FF8222A2F45  ?? ?? 00007FF8222A2F46  ?? ?? 00007FF8222A2F47  ?? ?? 00007FF8222A2F48  ?? ?? 00007FF8222A2F49  ?? ?? 00007FF8222A2F4A  ?? ?? 00007FF8222A2F4B  ?? ?? 00007FF8222A2F4C  ?? ?? 00007FF8222A2F4D  ?? ?? 00007FF8222A2F4E  ?? ?? 00007FF8222A2F4F  ?? ?? 00007FF8222A2F50  ?? ?? 00007FF8222A2F51  ?? ?? 00007FF8222A2F52  ?? ?? 00007FF8222A2F53  ?? ?? 00007FF8222A2F54  ?? ?? 00007FF8222A2F55  ?? ?? 00007FF8222A2F56  ?? ?? 00007FF8222A2F57  ?? ?? 00007FF8222A2F58  ?? ?? 00007FF8222A2F59  ?? ?? 00007FF8222A2F5A  ?? ?? 00007FF8222A2F5B  ?? ?? 00007FF8222A2F5C  ?? ?? 00007FF8222A2F5D  ?? ?? 00007FF8222A2F5E  ?? ?? 00007FF8222A2F5F  ?? ?? 00007FF8222A2F60 xabort 0FFh 00007FF8222A2F63 push qword ptr [rax+48FFFFFFh] 00007FF8222A2F69 lods dword ptr [rsi] 00007FF8222A2F6A vpbroadcastd ymm2,dword ptr [rax+0Ch] 00007FF8222A2F70 vpcmpeqd ymm3,ymm3,ymm3 00007FF8222A2F74 vpaddd ymm2,ymm2,ymm3 00007FF8222A2F78 vxorps ymm8,ymm8,ymm8 00007FF8222A2F7D vmaxps ymm0,ymm8,ymm0 00007FF8222A2F81 vminps ymm0,ymm0,ymm2 00007FF8222A2F85 vpbroadcastd ymm2,dword ptr [rax+10h] 00007FF8222A2F8B vpaddd ymm2,ymm2,ymm3 00007FF8222A2F8F vmaxps ymm1,ymm8,ymm1 00007FF8222A2F93 vminps ymm1,ymm1,ymm2 00007FF8222A2F97 mov r8,qword ptr [rax] 00007FF8222A2F9A vcvttps2dq ymm1,ymm1 00007FF8222A2F9E vpbroadcastd ymm2,dword ptr [rax+8] 00007FF8222A2FA4 vpmulld ymm1,ymm2,ymm1 00007FF8222A2FA9 vcvttps2dq ymm0,ymm0 00007FF8222A2FAD vpaddd ymm0,ymm1,ymm0 00007FF8222A2FB1 vpgatherdd ymm8,dword ptr [r8+ymm0*4],ymm3 00007FF8222A2FB7 vpand ymm0,ymm8,ymmword ptr [_sk_srcover_bgra_8888_sse2_lowp+788h (07FF8222D2FA0h)]

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