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OTP-8475 Driver threads, such as async threads, using port data locks
peeked at the port status field without proper locking when
looking up the driver queue.
OTP-8487 A call to the BIF unregister(RegName) when a port had the
name RegName registered in the runtime system without SMP
support caused a runtime system crash. (Thanks to Per Hedeland
for the bugfix and test case.)
OTP-8591 Fix memory management bug causing crash of non-SMP emulator
with async threads enabled. The bug did first appear in
R13B03.
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