The VolumeManager::mountObb() creates a mapping between a loopback device and a dm device. However the device-mapper carries it out asynchronously, so there is a possibility that Vold accesses to the dm device which is being built. Added waiting for completion of the mapping in that function, like mountAsec(). To verify install FrameworksCoreTests.apk and do: adb shell am instrument -r -w -e class android.os.storage.\ StorageManagerIntegrationTest#testMountTwoEncryptedObb \ com.android.frameworks.coretests/android.test.\ InstrumentationTestRunner Change-Id: If42f4b7494bb2f8a8b72d106ad84b3e3bf91fd9bgugelfrei
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