debug and fix #434

Job	Run time
Build Erlang/OTP (64-bit)	16m 27s
Event File	3s
Build Erlang/OTP (iOS)	7m 27s
Build Erlang/OTP (32-bit)	8m 27s
Build Erlang/OTP (macOS)	11m 40s
Build Erlang/OTP (Types and Flavors)	8m 44s
Build Erlang/OTP (cross-compile)	14m 8s
Build Erlang/OTP (clang)	5m 49s
Build Erlang/OTP (Windows)	12m 18s
Run static analysis	6m 40s
Build and check documentation	8m 16s
Test Erlang/OTP (emulator)	44m 40s
Test Erlang/OTP (debug)	5m 9s
Test Erlang/OTP (asn1)	14m 55s
Test Erlang/OTP (common_test)	1h 27m 49s
Test Erlang/OTP (compiler)	9m 31s
Test Erlang/OTP (crypto)	5m 5s
Test Erlang/OTP (debugger)	4m 28s
Test Erlang/OTP (dialyzer)	19m 38s
Test Erlang/OTP (diameter)	11m 44s
Test Erlang/OTP (edoc)	3m 16s
Test Erlang/OTP (eldap)	3m 20s
Test Erlang/OTP (erl_docgen)	3m 34s
Test Erlang/OTP (erl_interface)	5m 54s
Test Erlang/OTP (et)	3m 27s
Test Erlang/OTP (eunit)	3m 23s
Test Erlang/OTP (ftp)	4m 29s
Test Erlang/OTP (inets)	9m 54s
Test Erlang/OTP (kernel)	1h 0m 46s
Test Erlang/OTP (megaco)	31m 24s
Test Erlang/OTP (mnesia)	19m 18s
Test Erlang/OTP (observer)	13m 47s
Test Erlang/OTP (os_mon)	3m 50s
Test Erlang/OTP (public_key)	4m 34s
Test Erlang/OTP (runtime_tools)	4m 24s
Test Erlang/OTP (ssh)	17m 47s
Test Erlang/OTP (ssl)	47m 26s
Test Erlang/OTP (stdlib)	34m 50s
Test Erlang/OTP (tftp)	5m 21s
Test Erlang/OTP (wx)	3m 52s
Test Erlang/OTP (xmerl)	6m 53s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	16m 3s
	10h 10m 30s

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