arkham has been failing since build 849 and whirlwind since build 1576 with a sigsegv in the UnitTest step (specifically, DeviceRegistrationInfoTest.RegisterDevice). Example logs are here: https://uberchromegw.corp.google.com/i/chromeos/builders/arkham-release/builds/849/steps/UnitTest/logs/stdio

Seems to be timed with this CL going in: https://chromium-review.googlesource.com/c/433081/ since the libweave version was r108 in passing builds.