This looks similar to  issue 658777 .

Builder: https://build.chromium.org/p/chromiumos/builders/amd64-generic-asan

Failing builds:
https://build.chromium.org/p/chromiumos/builders/amd64-generic-asan/builds/19590
https://build.chromium.org/p/chromiumos/builders/amd64-generic-asan/builds/19589

Logs: https://pantheon.corp.google.com/storage/browser/chromeos-image-archive/amd64-generic-asan/R60-9504.0.0-b19590/vm_test_results_1/smoke_suite/test_harness/all/SimpleTestVerify/1_autotest_tests/results-29-security_SandboxedServices/debug/

snippet from client.0.DEBUG:

04/28 12:29:01.824 DEBUG|             utils:0202| Running 'scanelf -qF'%s#F' -gs __asan_init `which debugd`'
04/28 12:29:01.878 DEBUG|              asan:0026| running_on_asan(): symbol: '__asan_init', _ASAN_SYMBOL: '__asan_init'
04/28 12:29:01.879 INFO |security_Sandboxed:0225| ASAN image detected -> skipping seccomp checks
04/28 12:29:01.890 WARNI|security_Sandboxed:0308| Stale baselines: set(['cromo', 'warn_collector', 'tpm_managerd', 'daisydog', 'attestationd', 'brcm_patchram_p', 'tlsdated', 'easy_unlock', 'sslh-fork', 'thermal.sh', 'timberslide', 'tlsdated-setter', 'wimax-manager', 'esif_ufd', 'netfilter-queue', 'arc-networkd', 'X', 'mtpd', 'tcsd', 'arc-obb-mounter', 'lid_touchpad_he'])
04/28 12:29:01.896 WARNI|security_Sandboxed:0311| New services: set(['gdbus', 'webservd', 'apmanager', 'conntrackd', 'peerd', 'nacl_helper_non', 'avahi-daemon'])
04/28 12:29:01.908 ERROR|security_Sandboxed:0322| New services are not allowed to run as root, but these are: ['gdbus']
04/28 12:29:01.915 ERROR|security_Sandboxed:0326| Failed sandboxing: ['gdbus']
04/28 12:29:01.924 DEBUG|              test:0389| Test failed due to One or more processes failed sandboxing. Exception log follows the after_iteration_hooks.
04/28 12:29:01.925 DEBUG|              test:0392| starting after_iteration_hooks
04/28 12:29:01.934 DEBUG|             utils:0202| Running 'logger "autotest finished iteration /usr/local/autotest/results/default/security_SandboxedServices/sysinfo/iteration.1"'
04/28 12:29:01.947 DEBUG|              test:0395| after_iteration_hooks completed
04/28 12:29:01.948 WARNI|              test:0615| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 609, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/common_lib/test.py", line 817, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 470, in execute
    dargs)
  File "/usr/local/autotest/common_lib/test.py", line 347, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 380, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/tests/security_SandboxedServices/security_SandboxedServices.py", line 327, in run_once
    raise error.TestFail("One or more processes failed sandboxing")
TestFail: One or more processes failed sandboxing

Mike, are you the right owner for this?