std: Add debugging for a failing test on appveyor

[alexcrichton]

I'm not sure why this is failing, so let's hopefully get some more
information to help investigation!

[rust-highfive]

r? @cramertj

(rust_highfive has picked a reviewer for you, use r? to override)

[alexcrichton]

cc @kennytm

[alexcrichton]

@bors: r+ p=100

[bors]

📌 Commit d12de8f has been approved by alexcrichton

[RalfJung]

My theory is that the test runner is so slow that it just takes more than 100ns between the two measurements of the current system time.

[bors]

⌛ Testing commit d12de8f with merge c3d4dde803e05ce5ac5d8362da16351820fc4931...

[bors]

💔 Test failed - status-appveyor

[alexcrichton]

@bors: r+

@RalfJung that doesn't match up with the test, which doesn't rely on how long it takes between measurements. It calculates the difference between two measurements and ensure that the difference can be added/subtracted to the measurement to get the other.

[bors]

📌 Commit 7a99b6d has been approved by alexcrichton

[bors]

⌛ Testing commit 7a99b6d with merge 2e0c99e9b66278c539bcb1981f8fa19d7e822db5...

[bors]

💔 Test failed - status-travis

[rust-highfive]

The job dist-powerpc64-linux of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

Building stage2 tool cargo (powerpc64-unknown-linux-gnu)
[01:12:18] Downloading crates ...
[01:12:39] warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates.io)
[01:12:59] warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates.io)
[01:13:19] error: failed to download from `https://crates.io/api/v1/crates/openssl-src/111.0.1+1.1.1/download`
[01:13:19] Caused by:
[01:13:19] [6] Couldn't resolve host name (Could not resolve host: crates.io)
[01:13:19] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "build" "--target" "powerpc64-unknown-linux-gnu" "-j" "4" "--release" "--locked" "--color" "always" "--manifest-path" "/checkout/src/tools/cargo/Cargo.toml" "--features" "rustc-workspace-hack/all-static" "--message-format" "json"
[01:13:19] expected success, got: exit code: 101
---
travis_time:end:01456676:start=1542523426287567251,finish=1542523426295985375,duration=8418124
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:0a67bfa1
$ ln -s . checkout && for CORE in obj/cores/core.*; do EXE=$(echo $CORE | sed 's|obj/cores/core\.[0-9]*\.!checkout!\(.*\)|\1|;y|!|/|'); if [ -f "$EXE" ]; then printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" "$CORE"; gdb --batch -q -c "$CORE" "$EXE" -iex 'set auto-load off' -iex 'dir src/' -iex 'set sysroot .' -ex bt -ex q; echo travis_fold":"end:crashlog; fi; done || true
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:1916e6c2
travis_time:start:1916e6c2
$ cat ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
cat: ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers: No such file or directory
travis_fold:end:after_failure.5
travis_fold:start:after_failure.6
travis_time:start:0c73146c
$ dmesg | grep -i kill

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[kennytm]

@bors retry travis-ci/travis-ci#9696

[RalfJung]

@alexcrichton Ah, I misread the code.

[bors]

⌛ Testing commit 7a99b6d with merge 49c7597...

[bors]

💔 Test failed - status-appveyor

[alexcrichton]

@bors: retry

[bors]

⌛ Testing commit 7a99b6d with merge 5f2dcf40df7b5a061ca9548b291cd5c35c813d54...

[bors]

💔 Test failed - status-appveyor

[alexcrichton]

@bors: retry

• Spurious failure "failed to remove file ... Access is denied" in cargo test profile_selection_check_all_targets* on Windows #56040

[bors]

⌛ Testing commit 7a99b6d with merge 13c9439...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: alexcrichton
Pushing 13c9439 to master...