Ben, do you want to look at this or is the frequency too low?
I think Dimi might know about this one. I think has a patch that touches this assert.
I am not sure, bug 1237992 modified the skip-waiting-installed.https.html but it is not yet landed. The error for both cases is timeout , not fail on an assert, maybe a sw event is missed. Run on local windows7 with 200+ runs, cannot reproduce this issue. Also Checked try server, no other have encounter this error, the reproduce rate seems very low. I am running try now to see if it could be reproduced.
No problem. I just recalled you had looked at this recently. We can leave this bug open if it's very low frequency. Thanks for looking!
Try run with 20 times, cannot reproduce https://treeherder.mozilla.org/#/jobs?repo=try&revision=f7cc1f43fb82 As Ben suggests, leave this open , maybe it could be reproduced someday.
Bulk assigning P3 to all open intermittent bugs without a priority set in Firefox components per bug 1298978.