Build a checked mono

[rolfbjarne]

This is to track down mono/mono#15125, which is a mono crash that sometimes happens during our build. I've butchered our tests so that no tests should run on CI.

DO NOT MERGE

However, feel free to trigger rebuilds if you only see green here. It's possible we'll have to build this quite a few times before the crash triggers.

[lambdageek]

/cc @lambdageek

[monojenkins]

Build success
✅ Build succeeded
✅ API Diff (from stable)
✅ API Diff (from PR only) (no change)
✅ Generator Diff (no change)

[monojenkins]

Build failure
❌ Build failed or was aborted

❌ Build timed out

[rolfbjarne]

The build timed out:

[...]
09:31:27 CSC     [xammac] System.Buffers.dll
12:03:27 Execution timed out after 10800 seconds.
12:03:27 /var/folders/j5/85d9bzp941d12b7pc3zl7qf00000gn/T/jenkins6796648252675882712.sh: line 12:  8027 Killed: 9               ./jenkins/build.sh --timeout=10800

probably because mono crashed and then the crash reporting deadlocked.

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[xamarin-release-manager]

✅ Jenkins job (on internal Jenkins) succeeded

✅ Build succeeded

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[xamarin-release-manager]

✅ Jenkins job (on internal Jenkins) succeeded

✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[xamarin-release-manager]

✅ Jenkins job (on internal Jenkins) succeeded

✅ Build succeeded

[lambdageek]

build

[monojenkins]

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✅ Build succeeded

[rolfbjarne]

build

[xamarin-release-manager]

✅ Jenkins job (on internal Jenkins) succeeded

✅ Build succeeded

[xamarin-release-manager]

✅ Jenkins job (on internal Jenkins) succeeded

✅ Build succeeded

[xamarin-release-manager]

✅ Jenkins job (on internal Jenkins) succeeded

✅ Build succeeded

[xamarin-release-manager]

✅ Jenkins job (on internal Jenkins) succeeded

✅ Build succeeded

[xamarin-release-manager]

✅ Jenkins job (on internal Jenkins) succeeded

✅ Build succeeded

[chamons]

build

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build failure
❌ Build failed or was aborted

❌ Build timed out

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build success
✅ Build succeeded

[rolfbjarne]

build

[monojenkins]

Build failure
❌ Build failed or was aborted

❌ Build timed out

[rolfbjarne]

This crash does not seem to happen with mono-2019-06 or -08, which we're using in all branches we care about, so I think we can close this now.