Xcode 9.0.1 9A1004 SIGBUS While Debugging?

I just updated to Xcode 9.0.1 and can't run an ObjC macOS app target, which was working just a moment ago (before updating). I tried cleaning. An excerpt from the crash report is:

Version:               4.6.0 (355)
Code Type:             X86-64 (Native)
Parent Process:        lldb-rpc-server [15843]
Responsible:           MYAPP [18159]
User ID:               501

Date/Time:             2017-10-18 17:22:31.966 -0400
OS Version:            Mac OS X 10.13 (17A405)
Report Version:        12
Bridge OS Version:     3.0 (14Y661)
Anonymous UUID:        B8BA6228-DE0D-69B1-0124-5F53E6151B92

Sleep/Wake UUID:       16E7F775-ACE6-4E27-8976-8CA734B65EEA

Time Awake Since Boot: 95000 seconds
Time Since Wake:       4400 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGBUS)
Exception Codes:       KERN_PROTECTION_FAILURE at 0x00007fffeff481e2
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Bus error: 10
Termination Reason:    Namespace SIGNAL, Code 0xa
Terminating Process:   exc handler [0]

External Modification Warnings:
Debugger attached to process.


VM Regions Near 0x7fffeff481e2:
    __LINKEDIT             00007fffe3fbd000-00007fffefa9d000 [186.9M] r--/r-- SM=COW  dyld shared cache combined __LINKEDIT
--> unused shlib __TEXT    00007fffefa9d000-00007ffff07e5000 [ 13.3M] r--/r-- SM=COW  system shared lib __TEXT not used by this process
    shared memory          00007fffffe00000-00007fffffe01000 [    4K] r--/r-- SM=SHM


Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   ???                           0x00007fffeff481e2 0 + 140737219166690


Thread 1:: gputools.smt_poll.0x6000000228c0

The only stdout/stderr output is "[DYMTLInitPlatform] platform initialization successful"