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Building: autoninja -C /usr/local/google/code/clankium/src/out/x86Debug chrome/android:chrome_public_test_apk
ninja: Entering directory `/usr/local/google/code/clankium/src/out/x86Debug'
reapi instance: projects/rbe-chrome-untrusted/instances/default_instance
 1.50s loading fs state
 4.33s loading/recompacting deps log
 1.59s load build.ninja
1m07.12s Regenerating ninja files
 5.03s reloading
[13751/70928] 1m40.82s F ACTION //chrome/android/webapk/libs/runtime_library:webapk_runtime_library(//build/toolchain/android:android_clang_x86)
FAILED: 0eb43f18-6b11-49cc-aba0-229ec82f4f58 "./obj/chrome/android/webapk/libs/runtime_library/webapk_runtime_library.tracereferences.stamp" ACTION //chrome/android/webapk/libs/runtime_library:webapk_runtime_library(//build/toolchain/android:android_clang_x86)
err: remote-exec 12bd95f45fcc822498bdb3b7f107cedae844cfa08fa387790d63704eef363210/353 failed: exit=1
python3 ../../build/android/gyp/tracereferences.py --depfile gen/chrome/android/webapk/libs/runtime_library/webapk_runtime_library.d --tracerefs-json gen/chrome/android/webapk/libs/runtime_library/webapk_runtime_library.tracerefs.json --stamp obj/chrome/android/webapk/libs/runtime_library/webapk_runtime_library.tracereferences.stamp --use-build-server --warnings-as-errors
build step: __chrome_android_webapk_libs_runtime_library_webapk_runtime_library___build_toolchain_android_android_clang_x86__rule "./obj/chrome/android/webapk/libs/runtime_library/webapk_runtime_library.tracereferences.stamp"
siso_rule: android/trace_references
stdout:
Traceback (most recent call last):
  File "/b/f/w/out/x/../../build/android/gyp/tracereferences.py", line 191, in <module>
    main()
  File "/b/f/w/out/x/../../build/android/gyp/tracereferences.py", line 156, in main
    if server_utils.MaybeRunCommand(name=args.stamp,
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/b/f/w/build/android/gyp/util/server_utils.py", line 53, in MaybeRunCommand
    raise Exception(
Exception: AUTONINJA_BUILD_ID is not set. Should have been set by autoninja.

build failed
local:2384 remote:6406 cache:4964 fallback:0 retry:0 skip:23708
reapi: ops: 24044(err:6529) / r:14765(err:0) 1.04GiB / w:22724(err:2) 292.17MiB
fs: ops: 261564(err:83148) / r:86563(err:0) 4.85GiB / w:4522(err:10) 1.01GiB

1m43.06s Build Failure: 13756 done 3 failed 57172 remaining - 133.47/s
 1 steps failed: remote-exec 12bd95f45fcc822498bdb3b7f107cedae844cfa08fa387790d63704eef363210/353 failed: exit=1
see ./out/x86Debug/siso_output for full command line and output
 or ./out/x86Debug/siso.INFO
use ./out/x86Debug/siso_failed_commands.sh to re-run failed commands
⏩ There are still 403 static analysis jobs running in the background.
⏩ To wait for them: build/android/fast_local_dev_server.py --wait-for-idle

real    1m59.713s
user    20m57.052s
sys     4m16.581s

This cl is the most likely culprit https://chromium-review.googlesource.com/c/chromium/src/+/6365557 Fix is to use remote_run_static_analysis vs remote_run in the config for tracereferences.