The regression range in m-c (based on try pushes #2 and #3 from comment 0) is https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5cc220ddf028de011a922042ee9ba691b94d055d&tochange=909f78f4ebaed6cfd473735f6140a88ee7de3c0c Bisection try push #1 at m-c 2bb77ed1fcc5ad06f91612d419160f54c09369db: [bad](https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=5aa8140f5c1980b8a7caf269e207c1e808838231) Bisection try push #2 at m-c 3a79d3be67486be1d30bda47988cf8c76ee3a3ee [bad](https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=f257c68824f4bb7f88a8764cc1daa1114182663c) Bisection try push #3 at m-c c3f75e0814271535427e68195ccdabe61d3c95dc [bad](https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=06aa8654c9f8c7655b14bc404ab556cbb31cfaa7) Bisection try push #4 at m-c 267d1abce0581f08bdefc977f24e421c161e603f [good](https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=34c3904706df48c8ddbbaab02b5a46608b5be7ee) Bisection try push #5 at m-c fa7dcd1f369cf19b7af37d9cfc953fe1d131e1c4 [still pending](https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=605463ee3a667a5cbdc6728ef3de61e70f1c6b61) nika suggested I back out bug 1551601 so I did that locally and the problem went away. (Her suggestion is also why I chose those two revisions for bisection pushes #s 4 and 5). Once that last try push is done it should confirm this, but so far it seems like bug 1551601 is to blame.
Bug 1555966 Comment 2 Edit History
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The regression range in m-c (based on try pushes #2 and #3 from comment 0) is https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5cc220ddf028de011a922042ee9ba691b94d055d&tochange=909f78f4ebaed6cfd473735f6140a88ee7de3c0c Bisection try push #1 at m-c 2bb77ed1fcc5ad06f91612d419160f54c09369db: [bad](https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=5aa8140f5c1980b8a7caf269e207c1e808838231) Bisection try push #2 at m-c 3a79d3be67486be1d30bda47988cf8c76ee3a3ee [bad](https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=f257c68824f4bb7f88a8764cc1daa1114182663c) Bisection try push #3 at m-c c3f75e0814271535427e68195ccdabe61d3c95dc [bad](https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=06aa8654c9f8c7655b14bc404ab556cbb31cfaa7) Bisection try push #4 at m-c 267d1abce0581f08bdefc977f24e421c161e603f [good](https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=34c3904706df48c8ddbbaab02b5a46608b5be7ee) Bisection try push #5 at m-c fa7dcd1f369cf19b7af37d9cfc953fe1d131e1c4 [bad](https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=605463ee3a667a5cbdc6728ef3de61e70f1c6b61) nika suggested I back out bug 1551601 so I did that locally and the problem went away. (Her suggestion is also why I chose those two revisions for bisection pushes #s 4 and 5). Once that last try push is done it should confirm this, but so far it seems like bug 1551601 is to blame.