Bugzilla

Note, I'm chasing this down a bit (gathering more info at least by adding earlier assertions) in bug 1566991 and bug 1568673.

The former bug (which landed yesterday) added an assertion that seems to be catching this problem a bit earlier (and it seems to have done so, e.g. in newly-filed intermittent bug 1568405).  I suspect that any intermittent failures that *would* have been reported here will now instead appear on bug 1568405 (and soon perhaps on a new bug for the new assertion I'm adding in bug 1568673).

So: this bug might go "quiet" in terms of treeherder failure reports, but it's likely that the problem will have just been caught earlier (via an assertion with different text).

Also: it's notable that we've hit this assertion on Android and MacOS, the two platforms where we have overlay scrollbars.  I suspect overlay scrollbars are involved in causing trouble here.

Note, I'm chasing this down a bit (gathering more info at least by adding earlier assertions) in bug 1566991 and bug 1568673.

The former bug (which landed yesterday) added an assertion that seems to be catching this problem a bit earlier (and it seems to have done so, e.g. in newly-filed intermittent bug 1568405).  I suspect that any intermittent failures that *would* have been reported here will now instead appear on bug 1568405 (and soon perhaps on a new bug for the new assertion I'm adding in bug 1568673).

So: this bug might go "quiet" in terms of treeherder failure reports, but it's likely that the problem will have just been caught earlier (via an assertion with different text).

Also: it's notable that we've hit this assertion on Android (comment 0 w/ the fuzzer testcase) and MacOS (the intermittent reports), the two platforms where we have overlay scrollbars.  I suspect overlay scrollbars are involved in causing trouble here.

Note, I'm chasing this down a bit (gathering more info at least by adding earlier assertions) in bug 1566991 and bug 1568673.

The former bug (which landed yesterday) added an assertion that seems to be catching this problem a bit earlier (and it seems to have done so, e.g. in newly-filed intermittent bug 1568405).  I suspect that any intermittent failures that *would* have been reported here will now instead appear on bug 1568405 (and soon perhaps on a new bug for the new assertion I'm adding in bug 1568673).

So: this bug here might go "quiet" in terms of treeherder failure reports, but it's likely that the problem will have just been caught earlier (via an assertion with different text).

Also: it's notable that we've hit this assertion on Android (comment 0 w/ the fuzzer testcase) and MacOS (the intermittent reports), the two platforms where we have overlay scrollbars.  I suspect overlay scrollbars are involved in causing trouble here.