Hey Kagami, From the crash stack, it's not very clear where we got this problematic promise from. However, you've touched Promise code recently for Streams, and we've started landed/enabled Streams recently. It could be that the crash increment on nightly is coming from unexpected resolved/rejected promises in this new feature. So I think it makes sense to start from asking for your help to take a first look. Thank you.
Bug 1688585 Comment 5 Edit History
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Hey Kagami, The crash volume increased on nightly since April. From the crash stack, it's not very clear where we got this problematic promise from. However, you've touched Promise code recently for Streams, and we've started landed/enabled Streams recently. It could be that the crash increment on nightly is coming from unexpected resolved/rejected promises in this new feature. So I think it makes sense to start from asking for your help to take a first look. Thank you.