Whilst fuzzing Firefox Nightly (ASAN) Build ID 20210105094403, we're able to crash the browser by triggering an Assertion Failure. The profile is clean and about:support reports Compositing WebRender (Software).

###!!! [Parent][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost

Crash Annotation GraphicsCriticalError: |[C0][GFX1-]: Failed to allocate a surface due to invalid size (CDT) Size(10,0) (t=1725.73) [GFX1-]: Failed to allocate a surface due to invalid size (CDT) Size(10,0)
Crash Annotation GraphicsCriticalError: |[C0][GFX1-]: Failed to allocate a surface due to invalid size (CDT) Size(10,0) (t=1725.73) |[C1][GFX1-]: Failed to allocate a surface due to invalid size (CDT) Size(10,0) (t=1725.74) [GFX1-]: Failed to allocate a surface due to invalid size (CDT) Size(10,0)
[Child 170558, MediaDecoderStateMachine #1] WARNING: Decoder=617000177300 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /builds/worker/checkouts/gecko/dom/media/MediaDecoderStateMachine.cpp:368
[Child 170558, MediaDecoderStateMachine #1] WARNING: Decoder=617000177300 Decode error: NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006): file /builds/worker/checkouts/gecko/dom/media/MediaDecoderStateMachine.cpp:3465
Crash Annotation GraphicsCriticalError: |[C0][GFX1-]: Failed to allocate a surface due to invalid size (CDT) Size(10,0) (t=1725.73) |[C1][GFX1-]: Failed to allocate a surface due to invalid size (CDT) Size(10,0) (t=1725.74) |[C2][GFX1-]: Failed to allocate a surface due to invalid size (CDT) Size(0,0) (t=2118.28) [GFX1-]: Failed to allocate a surface due to invalid size (CDT) Size(0,0)
firefox: src/gl.cc:419: int DepthCursor::skip_failed(uint16_t) [FUNC = 515]: Assertion `valid()' failed.
Exiting due to channel error.
Exiting due to channel error.
Exiting due to channel error.
Exiting due to channel error.
Crash Annotation GraphicsCriticalError: |[C0][GFX1-]: Receive IPC close with reason=AbnormalShutdown (t=466.467) [GFX1-]: Receive IPC close with reason=AbnormalShutdown
Exiting due to channel error.