Crash report: https://crash-stats.mozilla.org/report/index/8adddb9a-577c-4c03-a7df-ec1280231220 MOZ_CRASH Reason: ```MOZ_RELEASE_ASSERT(EnumValidator::IsLegalValue( static_cast<std::underlying_type_t<paramType>>(aValue)))``` Top 10 frames of crashing thread: ``` 0 xul.dll IPC::EnumSerializer<nsCSSPropertyID, IPC::ContiguousEnumValidator<nsCSSPropertyID, -1, 480> >::Write ipc/glue/EnumSerializer.h:60 1 xul.dll IPC::WriteParam ipc/chromium/src/chrome/common/ipc_message_utils.h:441 1 xul.dll IPC::ParamTraits<mozilla::layers::Animation>::Write ipc/ipdl/LayersMessages.cpp:2133 2 xul.dll IPC::WriteParam ipc/chromium/src/chrome/common/ipc_message_utils.h:441 2 xul.dll IPC::WriteSequenceParam<const mozilla::layers::Animation&> ipc/chromium/src/chrome/common/ipc_message_utils.h:593 3 xul.dll IPC::ParamTraits<nsTArray<mozilla::layers::Animation> >::Write ipc/glue/IPCMessageUtilsSpecializations.h:164 3 xul.dll IPC::WriteParam ipc/chromium/src/chrome/common/ipc_message_utils.h:441 3 xul.dll IPC::ParamTraits<mozilla::layers::CompositorAnimations>::Write ipc/ipdl/LayersMessages.cpp:2412 4 xul.dll IPC::WriteParam ipc/chromium/src/chrome/common/ipc_message_utils.h:441 4 xul.dll IPC::ParamTraits<mozilla::layers::OpAddCompositorAnimations>::Write ipc/ipdl/WebRenderMessages.cpp:227 ```
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31 crashes on Windows from 14 installations of Firefox 123.0a1 20231220041048 - the first affected build. Crash report: https://crash-stats.mozilla.org/report/index/8adddb9a-577c-4c03-a7df-ec1280231220 MOZ_CRASH Reason: ```MOZ_RELEASE_ASSERT(EnumValidator::IsLegalValue( static_cast<std::underlying_type_t<paramType>>(aValue)))``` Top 10 frames of crashing thread: ``` 0 xul.dll IPC::EnumSerializer<nsCSSPropertyID, IPC::ContiguousEnumValidator<nsCSSPropertyID, -1, 480> >::Write ipc/glue/EnumSerializer.h:60 1 xul.dll IPC::WriteParam ipc/chromium/src/chrome/common/ipc_message_utils.h:441 1 xul.dll IPC::ParamTraits<mozilla::layers::Animation>::Write ipc/ipdl/LayersMessages.cpp:2133 2 xul.dll IPC::WriteParam ipc/chromium/src/chrome/common/ipc_message_utils.h:441 2 xul.dll IPC::WriteSequenceParam<const mozilla::layers::Animation&> ipc/chromium/src/chrome/common/ipc_message_utils.h:593 3 xul.dll IPC::ParamTraits<nsTArray<mozilla::layers::Animation> >::Write ipc/glue/IPCMessageUtilsSpecializations.h:164 3 xul.dll IPC::WriteParam ipc/chromium/src/chrome/common/ipc_message_utils.h:441 3 xul.dll IPC::ParamTraits<mozilla::layers::CompositorAnimations>::Write ipc/ipdl/LayersMessages.cpp:2412 4 xul.dll IPC::WriteParam ipc/chromium/src/chrome/common/ipc_message_utils.h:441 4 xul.dll IPC::ParamTraits<mozilla::layers::OpAddCompositorAnimations>::Write ipc/ipdl/WebRenderMessages.cpp:227 ```