If I am reading this right the stress-smoke-tests are passing and still exiting 9:

10:48:46 DEBUG| Running '/tmp/autopkgtest.Oam7xW/build.p0V/linux-4.9.0/autotest/client/tests/ubuntu_stress_smoke_test/ubuntu_stress_smoke_test.sh'
10:48:56 DEBUG| [stdout] affinity PASSED
10:49:06 DEBUG| [stdout] af-alg PASSED
10:49:16 DEBUG| [stdout] aio PASSED
10:49:26 DEBUG| [stdout] aiol PASSED
10:49:36 DEBUG| [stdout] atomic PASSED
10:49:46 DEBUG| [stdout] bigheap PASSED
10:49:46 DEBUG| [stdout] bind-mount SKIPPED (test framework out of resources or test should not be run)
10:49:57 DEBUG| [stdout] brk PASSED
10:50:07 DEBUG| [stdout] bsearch PASSED
10:50:17 DEBUG| [stdout] cache PASSED
10:50:27 DEBUG| [stdout] cap PASSED
10:50:37 DEBUG| [stdout] chdir PASSED
10:50:47 DEBUG| [stdout] chmod PASSED
10:50:57 DEBUG| [stdout] chown PASSED
10:51:07 DEBUG| [stdout] clock PASSED
10:51:21 DEBUG| [stdout] clone PASSED
10:51:32 DEBUG| [stdout] context PASSED
10:51:42 DEBUG| [stdout] cpu PASSED
10:51:52 DEBUG| [stdout] crypt PASSED
10:52:02 DEBUG| [stdout] daemon PASSED
10:52:03 DEBUG| [stdout] dccp PASSED
10:52:13 DEBUG| [stdout] dentry PASSED
10:52:23 DEBUG| [stdout] dir PASSED
10:52:33 DEBUG| [stdout] dirdeep PASSED
10:52:43 DEBUG| [stdout] dnotify PASSED
10:52:53 DEBUG| [stdout] dup PASSED
10:53:03 DEBUG| [stdout] epoll PASSED
10:53:13 DEBUG| [stdout] eventfd PASSED
10:53:23 DEBUG| [stdout] fallocate PASSED
10:53:33 DEBUG| [stdout] fanotify PASSED
10:53:43 DEBUG| [stdout] fault PASSED
10:53:53 DEBUG| [stdout] fcntl PASSED
10:54:04 DEBUG| [stdout] fiemap PASSED
10:54:14 DEBUG| [stdout] fifo PASSED
10:54:24 DEBUG| [stdout] filename PASSED
10:54:34 DEBUG| [stdout] flock PASSED
10:54:44 DEBUG| [stdout] fork PASSED
10:54:54 DEBUG| [stdout] fp-error PASSED
10:55:04 DEBUG| [stdout] fstat PASSED
10:55:14 DEBUG| [stdout] full PASSED
10:55:24 DEBUG| [stdout] futex PASSED
10:55:34 DEBUG| [stdout] get PASSED
10:55:44 DEBUG| [stdout] getdent PASSED
10:55:54 DEBUG| [stdout] getrandom PASSED
10:56:04 DEBUG| [stdout] handle PASSED
10:56:16 DEBUG| [stdout] hdd PASSED
10:56:26 DEBUG| [stdout] heapsort PASSED
10:56:36 DEBUG| [stdout] hsearch PASSED
10:56:36 DEBUG| [stdout] icache PASSED
10:56:46 DEBUG| [stdout] icmp-flood PASSED
10:56:56 DEBUG| [stdout] inotify PASSED
10:57:06 DEBUG| [stdout] io PASSED
10:57:16 DEBUG| [stdout] ioprio PASSED
10:57:26 DEBUG| [stdout] itimer PASSED
10:57:27 DEBUG| [stdout] key PASSED
10:57:37 DEBUG| [stdout] kill PASSED
10:57:47 DEBUG| [stdout] klog PASSED
10:57:57 DEBUG| [stdout] lease PASSED
10:58:07 DEBUG| [stdout] link PASSED
10:58:07 DEBUG| [stdout] lockbus PASSED
10:58:17 DEBUG| [stdout] locka PASSED
10:58:27 DEBUG| [stdout] lockf PASSED
10:58:37 DEBUG| [stdout] lockofd PASSED
10:58:47 DEBUG| [stdout] longjmp PASSED
10:58:57 DEBUG| [stdout] lsearch PASSED
10:59:07 DEBUG| [stdout] madvise PASSED
10:59:18 DEBUG| [stdout] malloc PASSED
10:59:28 DEBUG| [stdout] matrix PASSED
10:59:38 DEBUG| [stdout] membarrier PASSED
10:59:48 DEBUG| [stdout] memcpy PASSED
10:59:58 DEBUG| [stdout] memfd PASSED
11:00:08 DEBUG| [stdout] mergesort PASSED
11:00:18 DEBUG| [stdout] mincore PASSED
11:00:28 DEBUG| [stdout] mknod PASSED
11:00:34 INFO | 		ERROR	ubuntu_stress_smoke_test.stress-smoke-test	ubuntu_stress_smoke_test.stress-smoke-test	timestamp=1485082834	localtime=Jan 22 11:00:34	Test subprocess failed rc=9
11:00:34 INFO | 	END ERROR	ubuntu_stress_smoke_test.stress-smoke-test	ubuntu_stress_smoke_test.stress-smoke-test	timestamp=1485082834	localtime=Jan 22