maybe caused by https://bugs.chromium.org/p/chromium/issues/detail?id=607632 ?

e.g. https://uberchromegw.corp.google.com/i/chromeos/builders/veyron_rialto-release/builds/96


security_OpenFDs: http://cautotest.corp.google.com/afe/#tab_id=view_job&object_id=66008625
The suite job has another 0:59:48.203939 till timeout.
The suite job has another 0:29:46.742936 till timeout.
The suite job has another -1 day, 23:59:45.057435 till timeout.
Suite timed out. Started on 06-07-2016 [04:36:20], timed out on 06-07-2016 [06:44:02]
Suite job                      [ FAILED ]
Suite job                        ABORT: 
security_RuntimeExecStack      [ FAILED ]
security_RuntimeExecStack        ABORT: Timed out, did not run.
security_ASLR                  [ FAILED ]
security_ASLR                    ABORT: Timed out, did not run.
security_SymlinkRestrictions   [ FAILED ]
security_SymlinkRestrictions     ABORT: Timed out, did not run.
platform_CrosDisksDBus         [ FAILED ]
platform_CrosDisksDBus           ABORT: Timed out, did not run.
security_ptraceRestrictions    [ FAILED ]
security_ptraceRestrictions      ABORT: Timed out, did not run.
security_mprotect              [ PASSED ]
security_Minijail0             [ PASSED ]
security_SysLogPermissions     [ PASSED ]
security_OpenFDs               [ FAILED ]
security_OpenFDs                 FAIL: Unexpected open file descriptors.
security_DbusOwners            [ PASSED ]


Output below this line is for buildbot consumption:
@@@STEP_LINK@[Test-Logs]: Suite job: ABORT@http://cautotest/tko/retrieve_logs.cgi?job=/results/66006985-chromeos-test/@@@
@@@STEP_LINK@[Flake-Dashboard]: Suite job@https://wmatrix.googleplex.com/retry_teststats/?days_back=30&tests=Suite job@@@
@@@STEP_LINK@[Test-Logs]: security_OpenFDs: FAIL: Unexpected open file descriptors.@http://cautotest/tko/retrieve_logs.cgi?job=/results/66007001-chromeos-test/@@@
@@@STEP_LINK@[Flake-Dashboard]: security_OpenFDs@https://wmatrix.googleplex.com/retry_teststats/?days_back=30&tests=security_OpenFDs@@@
Will return from run_suite with status: ERROR
06:44:58: INFO: Running cidb query on pid 4035, repr(query) starts with <sqlalchemy.sql.expression.Insert object at 0x7f167dc40090>
06:45:02: INFO: cidb query succeeded after 1 retries