Several tryjobs are throwing these exceptions now. Claims the tasks are missing from swarming, but I clicked on one and it's there...

E.g. https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_rel_ng is now quite purple too.

E.g. https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_rel_ng/builds/356193 claims it's missing this shard: https://chromium-swarm.appspot.com/task?id=3316ac94af182f10&refresh=10&show_raw=1

But the swarming task completed successfully?!?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build.git/+/8758e4ed83393b9b874d8c64d0f37edd6d14444e

commit 8758e4ed83393b9b874d8c64d0f37edd6d14444e
Author: Marc-Antoine Ruel <maruel@chromium.org>
Date: Wed Dec 14 15:35:01 2016

Revert "Improve swarming task handling of failure modes."

This reverts commit 61c59449c14705e705ec399b42306f79d7e73efd.

Reason for revert: Blew up on the try server.

BUG= 674147 

Original change's description:
> Improve swarming task handling of failure modes.
> 
> Handles the following modes:
> - TIMED_OUT: a task ran but it ran for too long so it was forcibly terminated.
>   This is a user failure.
> - EXPIRED: there was not enough capacity to run the task. This is an
>   infrastructure failure; capacity does not handle the demand.
> - BOT_DIED: there was a Swarming internal failure; this is an infrastructure
>   failure.
> 
> Remove iOS specific recipe code to generalize failure handling.
> 
> R=vadimsh@chromium.org
> BUG= 649841 
> 
> Change-Id: Iac5dd293ec112a4b71a7b3bcd9871a7252b37d1a
> Reviewed-on: https://chromium-review.googlesource.com/419135
> Commit-Queue: Marc-Antoine Ruel <maruel@chromium.org>
> Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
> 

TBR=maruel@chromium.org,vadimsh@chromium.org,smut@chromium.org,martiniss@chromium.org,nednguyen@google.com,chromium-reviews@chromium.org,eyaich@chromium.org,katthomas@chromium.org,mcgreevy@chromium.org
BUG= 649841 
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I9de3f60758e1f01254b2c6a535fef650e4b8781f
Reviewed-on: https://chromium-review.googlesource.com/419701
Commit-Queue: Marc-Antoine Ruel <maruel@chromium.org>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>

[modify] https://crrev.com/8758e4ed83393b9b874d8c64d0f37edd6d14444e/scripts/slave/recipe_modules/ios/api.py
[add] https://crrev.com/8758e4ed83393b9b874d8c64d0f37edd6d14444e/scripts/slave/recipe_modules/ios/example.expected/expired.json
[modify] https://crrev.com/8758e4ed83393b9b874d8c64d0f37edd6d14444e/scripts/slave/recipe_modules/ios/example.expected/timed_out.json
[modify] https://crrev.com/8758e4ed83393b9b874d8c64d0f37edd6d14444e/scripts/slave/recipe_modules/ios/example.py
[modify] https://crrev.com/8758e4ed83393b9b874d8c64d0f37edd6d14444e/scripts/slave/recipe_modules/swarming/api.py
[delete] https://crrev.com/2c2055ef8646cd7ca972d18a659f2e8ad1fc40d3/scripts/slave/recipe_modules/swarming/example.expected/isolated_script_expired.json
[delete] https://crrev.com/2c2055ef8646cd7ca972d18a659f2e8ad1fc40d3/scripts/slave/recipe_modules/swarming/example.expected/isolated_script_timeout.json
[delete] https://crrev.com/2c2055ef8646cd7ca972d18a659f2e8ad1fc40d3/scripts/slave/recipe_modules/swarming/example.expected/swarming_expired.json
[delete] https://crrev.com/2c2055ef8646cd7ca972d18a659f2e8ad1fc40d3/scripts/slave/recipe_modules/swarming/example.expected/swarming_timeout.json
[modify] https://crrev.com/8758e4ed83393b9b874d8c64d0f37edd6d14444e/scripts/slave/recipe_modules/swarming/example.py
[modify] https://crrev.com/8758e4ed83393b9b874d8c64d0f37edd6d14444e/scripts/slave/recipe_modules/swarming/resources/collect_gtest_task.py
[modify] https://crrev.com/8758e4ed83393b9b874d8c64d0f37edd6d14444e/scripts/slave/recipe_modules/swarming/tests/collect_gtest_task_test.py

Thanks Michael, I looked around and it seems to be fixed.