See the following luci.chromium.try swarming bots: https://chromium-swarm.appspot.com/bot?id=swarm994-c4 https://chromium-swarm.appspot.com/bot?id=swarm983-c4 https://chromium-swarm.appspot.com/bot?id=swarm943-c4 They have a ~50% task failure rate, and nearly all of the failures are related to mojom_bindings_generator.py's use of jinja. Example failures: https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8954628033579425488%2F%2B%2Fsteps%2Fcompile__with_patch_%2F0%2Fstdout https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8954600789604379552%2F%2B%2Fsteps%2Fcompile__with_patch_%2F0%2Fstdout https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8954527292195274048%2F%2B%2Fsteps%2Fcompile__with_patch_%2F0%2Fstdout The swarming bots should have a success rate that looks more like: https://chromium-swarm.appspot.com/bot?id=swarm991-c4 https://chromium-swarm.appspot.com/bot?id=swarm992-c4 This is a problem because it's causing the experimental/luci version of trybots in some CLs to fail while the buildbot version passes: https://chromium-review.googlesource.com/c/chromium/src/+/881017/10 https://chromium-review.googlesource.com/c/chromium/src/+/867511/21 https://chromium-review.googlesource.com/c/chromium/src/+/918323/7
I saw this yesterday too; it seemed to be related to whatever precompile_templates spits out: https://codesearch.chromium.org/chromium/src/mojo/public/tools/bindings/BUILD.gn?rcl=12325b07c764c6f823daf43d50aa5b270d7e68dc&l=67 Removing those from <out>/gen/mojo/public/tools/bindings and rebuilding seems to work? +rockot in case you've seen similar issues before.
That path didn't exist on https://chromium-swarm.appspot.com/bot?id=swarm994-c4. Redeployed the vm, so now it gets a fully clean disk. I'll see if it rolls green after that.
That bot looks a lot more green. I'll just respawn the rest of that bot's pool. And if it doesn't pop-up again after that, I'll just wontfix this.
Haven't see the error again since respawning.
Comment 1 by jbudorick@chromium.org
, Feb 16 2018