It looks like a timeout, but no timeout message is printed.

01/06 09:37:40.712 DEBUG|     site_autotest:0194| AUTOTEST_STATUS::START	----	----	timestamp=1483724259	localtime=Jan 06 09:37:39	
01/06 09:37:40.715 INFO |        server_job:0153| START	----	----	timestamp=1483724259	localtime=Jan 06 09:37:39	
01/06 09:37:40.787 DEBUG|     site_autotest:0194| AUTOTEST_STATUS::	START	audio_Microphone	audio_Microphone	timestamp=1483724259	localtime=Jan 06 09:37:39	
01/06 09:37:40.787 INFO |        server_job:0153| 	START	audio_Microphone	audio_Microphone	timestamp=1483724259	localtime=Jan 06 09:37:39	
01/06 09:38:25.640 DEBUG|          monitors:0191| ts_mon: sending 10 metrics to PubSub
01/06 11:00:14.620 INFO |          autoserv:0699| Results placed in /usr/local/autotest/results/94722720-chromeos-test/chromeos4-row2-rack9-host1
01/06 11:00:14.620 DEBUG|          autoserv:0707| autoserv is running in drone chromeos-server12.cbf.corp.google.com.
01/06 11:00:14.620 DEBUG|          autoserv:0708| autoserv command was: /usr/local/autotest/server/autoserv -p --pidfile-label=collect_crashinfo --use-existing-results --collect-crashinfo -m chromeos4-row2-rack9-host1 -r /usr/local/autotest/results/94722720-chromeos-test/chromeos4-row2-rack9-host1
01/06 11:00:14.620 INFO |           pidfile:0016| Logged pid 23170 to /usr/local/autotest/results/94722720-chromeos-test/chromeos4-row2-rack9-host1/.collect_crashinfo_execute
01/06 11:00:14.621 DEBUG|          autoserv:0428| faulthandler registered on SIGTERM.

Not sure what happened, but a microphone test should really time out before 1h 20m.

More detail in client.0.DEBUG:

01/06 09:37:39.959 DEBUG|        base_utils:0185| Running 'echo "fd6813c09dd170d2f3c5ec57da0725ba" > /usr/local/autotest/tests/audio_Microphone/.checksum '
01/06 09:37:40.121 INFO |      base_sysinfo:0380| ChromeOS BOARD = stumpy_2.5GHz_4GB
01/06 09:37:40.122 DEBUG|        base_utils:0185| Running 'logger "autotest starting iteration /usr/local/autotest/results/default/audio_Microphone/sysinfo/iteration.1 on stumpy_2.5GHz_4GB"'
01/06 09:37:40.139 INFO |         cmd_utils:0177| [0001] Running: /usr/bin/amixer -c 0 controls
01/06 09:37:40.147 INFO |         cmd_utils:0183| [0001] pid is 4542
01/06 09:37:40.152 INFO |         cmd_utils:0177| [0002] Running: /usr/bin/arecord -l
01/06 09:37:40.160 INFO |         cmd_utils:0183| [0002] pid is 4543
01/06 09:37:40.165 INFO |         cmd_utils:0177| [0003] Running: /usr/bin/arecord -d 3 -c 1 -f S16_LE -r 44100 -D plughw:0,0 /tmp/tmp5bbM7w
01/06 09:37:40.170 INFO |         cmd_utils:0183| [0003] pid is 4544
01/06 09:37:40.175 ERROR|         cmd_utils:0090| [0003] Recording WAVE '/tmp/tmp5bbM7w' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono
01/06 09:37:40.181 ERROR|         cmd_utils:0090| [0003] 

The file ends here.

arecord -d 3 should record for 3 seconds.

Would be good to check with the audio folks.  There are no audio-related CLs (but there are a few EC CLs).

https://chromium-review.googlesource.com/#/c/419702/ was the only CL got rejected

Looks like it passed later.

semenzato@ - assigning to you, seems like maybe it's not happening anymore? If so, feel free to close. 

Assigning to the last person who modified that test, FYI.  Feel free to close.

Bulk closing Infra>Client>ChromeOS issues untouched in over a year.