glGenSyncTokenCHROMIUM exception randomly thrown

CesiumJS
1

Hi,

I observed (and also had it reported by some of my users) the following exception leading to Cesium crashing.

It happens very randomly, sometimes after of a long period of normal operation of Cesium (one hour+)

Here is the log:

GL_INVALID_OPERATION : glGenSyncTokenCHROMIUM: fence sync must be flushed before generating sync token

WebGL: CONTEXT_LOST_WEBGL: loseContext: context lost

Cesium.js:477 An error occurred while rendering. Rendering has stopped.

undefined

RangeError: Invalid array length

RangeError: Invalid array length

at ye (http://dev.gefs.com/projects/GEFS/libs/3rdp/Cesium/1-27/Cesium.js:471:22507)

at Se (http://dev.gefs.com/projects/GEFS/libs/3rdp/Cesium/1-27/Cesium.js:471:25387)

at Ve (http://dev.gefs.com/projects/GEFS/libs/3rdp/Cesium/1-27/Cesium.js:472:2616)

at Be (http://dev.gefs.com/projects/GEFS/libs/3rdp/Cesium/1-27/Cesium.js:472:570)

at qe (http://dev.gefs.com/projects/GEFS/libs/3rdp/Cesium/1-27/Cesium.js:472:6648)

at de.render (http://dev.gefs.com/projects/GEFS/libs/3rdp/Cesium/1-27/Cesium.js:472:11828)

at P.render (http://dev.gefs.com/projects/GEFS/libs/3rdp/Cesium/1-27/Cesium.js:477:23779)

at t (http://dev.gefs.com/projects/GEFS/libs/3rdp/Cesium/1-27/Cesium.js:477:10572)

This is Cesium 1.27 stable, running on Google Chrome (54.0.2840.99 m (64-bit)) with a Geforce 610M

It has been reported to me that this error does not occur when running on Firefox but I can not confirm this.

Cheers,

Xavier.

2

Thanks Xavier. Do you have any way for us to reproduce this? It will be very difficult for us to figure out what is going on otherwise.

Best,

Hannah

3

Hi Hannah,

Sadly, I do not have any reproductible scenario: this appears to be quite a rare and random error.

I just thought I would let you know in case the logs and error message would ring any bell.

Thanks,

Xavier.

4

Did you ever figure out what was causing this?

5

Apparently this issues was resolved by reducing the tile cache size I had pushed to unreasonable value. Vram would eventually fill up and that would cause the crash after some time.

This is not entirely confirmed yet but it looks promising.

Xaviet