Chrome OS crash on linux desktop build OobeUI::GetErrorScreen

Please help; this makes it difficult to debug/test the login flow locally.

I'm using a local build of Chrome OS (I'm at ToT @ #418722) on linux desktop:
(1) Run with fresh user data dir: chrome --user-data-dir=/tmp/foo --login-manager
(2) Click "Let's Go" on the first OOBE screen.
(3) "Connect to Network" dialog shows (saying eth1 and wifi1 are connected) without an option to continue...
(4) Click any network option listed to try to proceed. CRASH!

Expected: Can get past dialog somehow and actually login!
Actual: Crash; see stack below.

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f49c1ef1385 in std::unique_ptr<chromeos::ErrorScreen, std::default_delete<chromeos::ErrorScreen> >::get (this=0x130)
    at ../../build/linux/ubuntu_precise_amd64-sysroot/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/bits/unique_ptr.h:217
#1  0x00007f49c1ef069c in chromeos::OobeUI::GetErrorScreen (this=0x0)
    at ../../chrome/browser/ui/webui/chromeos/login/oobe_ui.cc:440
#2  0x00007f49be96b44c in chromeos::WizardController::GetErrorScreen (this=0x31f059c3ea20)
    at ../../chrome/browser/chromeos/login/wizard_controller.cc:333
#3  0x00007f49be8a5f36 in chromeos::UpdateScreen::GetErrorScreen (this=0x31f05b6a20a0)
    at ../../chrome/browser/chromeos/login/screens/update_screen.cc:514
#4  0x00007f49be8a4f2c in chromeos::UpdateScreen::StartUpdateCheck (this=0x31f05b6a20a0)
    at ../../chrome/browser/chromeos/login/screens/update_screen.cc:519
#5  0x00007f49be8a4dfd in chromeos::UpdateScreen::OnPortalDetectionCompleted (this=0x31f05b6a20a0, network=0x31f059d7c920, 
    state=...) at ../../chrome/browser/chromeos/login/screens/update_screen.cc:298
#6  0x00007f49be99ac75 in chromeos::NetworkPortalDetectorImpl::AddAndFireObserver (this=0x31f05a624620, observer=0x31f05b6a21b0)
    at ../../chrome/browser/chromeos/net/network_portal_detector_impl.cc:276
#7  0x00007f49be8a57bb in chromeos::UpdateScreen::StartNetworkCheck (this=0x31f05b6a20a0)
    at ../../chrome/browser/chromeos/login/screens/update_screen.cc:321
#8  0x00007f49be96e30e in chromeos::WizardController::InitiateOOBEUpdate (this=0x31f059c3ea20)
    at ../../chrome/browser/chromeos/login/wizard_controller.cc:823
#9  0x00007f49be96e0f3 in chromeos::WizardController::OnNetworkConnected (this=0x31f059c3ea20)
    at ../../chrome/browser/chromeos/login/wizard_controller.cc:616
#10 0x00007f49be96fe61 in chromeos::WizardController::OnExit (this=0x31f059c3ea20, 
    exit_code=chromeos::BaseScreenDelegate::NETWORK_CONNECTED) at ../../chrome/browser/chromeos/login/wizard_controller.cc:1022
#11 0x00007f49be882672 in chromeos::BaseScreen::Finish (this=0x31f0599b5ca0, 
    exit_code=chromeos::BaseScreenDelegate::NETWORK_CONNECTED) at ../../chrome/browser/chromeos/login/screens/base_screen.cc:119
#12 0x00007f49be8986b0 in chromeos::NetworkScreen::NotifyOnConnection (this=0x31f0599b5ca0)
    at ../../chrome/browser/chromeos/login/screens/network_screen.cc:326
#13 0x00007f49be8976f3 in chromeos::NetworkScreen::OnContinueButtonPressed (this=0x31f0599b5ca0)
    at ../../chrome/browser/chromeos/login/screens/network_screen.cc:395
#14 0x00007f49be897601 in chromeos::NetworkScreen::OnUserAction (this=0x31f0599b5ca0, action_id="continue")
    at ../../chrome/browser/chromeos/login/screens/network_screen.cc:129
#15 0x00007f49c230b00b in chromeos::BaseScreenHandler::HandleUserAction (this=0x31f059d60528, action_id="continue")
    at ../../chrome/browser/ui/webui/chromeos/login/base_screen_handler.cc:118

Here are my gn args, in case that matters:
is_component_build = true
target_os = "chromeos"
use_goma = true
use_ozone = true
ozone_auto_platforms = false
ozone_platform_x11 = true