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TestAddressMasks failed on the lldb-arm-buntu bot with the Code address mask test, mask = process.GetAddressMask(lldb.eAddressMaskTypeAny) process.SetAddressMask(lldb.eAddressMaskTypeCode, mask | 0x3) self.assertEqual( 0x000002950001F694, process.FixAddress(0x00265E950001F697, lldb.eAddressMaskTypeCode), ) The API returned 0x000002950001f694 instead of the expected 0x00265e950001f696. The low bits differ because ABISysV_arm hardcodes the Code address mask to clear the 0th bit, it doesn't use the Process code mask. I didn't debug why some of the high bytes were dropped. The address mask APIs are only important on 64-bit targets, where many of the bits are not used for addressing and are used for metadata instead, so I'm going to skip these tests on 32-bit arm instead of debugging.