Bug 1171488 introduced attaching system information to recordings for debugging. When starting a recording, an error is throw at: Exception: "Component returned failure code: 0x80570016 (NS_ERROR_XPC_GS_RETURNED_FAILURE) [nsIJSCID.getService] resource://gre/modules/devtools/shared/system.js::getSetting::line 294 Recreatable on build 43.0a1 - 20150914150204

The getSetting code is not correct for working in the child process. We should use a try / catch as a quick fix and file a follow up to make it work for real.

https://treeherder.mozilla.org/#/jobs?repo=try&revision=9f56f43af50f Not sure how to even write a test for this.. or even test it..

Comment on attachment 8662544 [details] [diff] [review] 1205431-b2g-getsettings.patch Review of attachment 8662544 [details] [diff] [review]: ----------------------------------------------------------------- To be nice to other callers of `getSetting`, also add a try / catch inside that method that rejects its promise in case of error. The failure is currently on the `let settingsService = Cc["@mozilla.org/settingsService;1"].getService(Ci.nsISettingsService);` line, so we get inside the current if. You'll still need the try you already added, since the promise will be rejected. Not aware of a good way to test this today, unfortunately.

Made those changes https://treeherder.mozilla.org/#/jobs?repo=try&revision=ddb6e3306c41