# Help debugging 'There was an error processing coverage reports'

**URL:** <https://community.codecov.com/t/help-debugging-there-was-an-error-processing-coverage-reports/1984>\
**Category:** Support\
**Tags:** cpp\
**Created:** [September 17, 2020, 2:10am UTC](https://community.codecov.com/t/help-debugging-there-was-an-error-processing-coverage-reports/1984 "2020-09-17T02:10:19Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![devjgm](https://avatars.discourse-cdn.com/v4/letter/d/65b543/32.png) [@devjgm](https://community.codecov.com/u/devjgm)\
**Post date:** [September 17, 2020, 2:10am UTC](https://community.codecov.com/t/help-debugging-there-was-an-error-processing-coverage-reports/1984/1 "2020-09-17T02:10:20Z")

</div>

_Please check the [troubleshooting guide](https://docs.codecov.io/docs/troubleshooting-guide) before creating a ticket._

### Description

I’m using bazel 3.5.0 to generate code `coverage.dat` files for my C++ build. The `coverage.dat` files seem to be in lcov format.

I’m using the bash uploader to upload these files, and it appears to work. However, when I try to view the results in the [codecov.io](http://codecov.io) UI, I see a generic message like “There was an error processing coverage reports.”, but it doesn’t tell me what the error was, nor provide any way to debug.

### Repository

[https://github.com/googleapis/google-cloud-cpp](https://github.com/googleapis/google-cloud-cpp)

### CI/CD

An internal Google thing called “kokoro”.

### Uploader

`/bin/bash <(curl -s https://codecov.io/bash) -s /h`  
[https://github.com/googleapis/google-cloud-cpp/pull/5070](https://github.com/googleapis/google-cloud-cpp/pull/5070)

### Commit SHAs

82daaace24c8bf3fa890b2c222a4c4f360555beb is an example

### Codecov YAML

```auto
# Disable commit statuses
coverage:
  range: 90..100
  status:
    project: off
    patch: off

ignore:
  # Ignore code generated by protobuf, we do not need to test that.
  - "*.pb.cc"
  - "*.pb.h"
  # Also ignore the unit tests.
  - "**/*_test.cc$"

```

### Codecov Output

There’s too much output, so here’s a snippet of the beginning and end:

```auto
  _____ _
 / ____ | | |
| | _____ | | ______  _______
| | / _ \ / _` |/ _ \/ __/ _ \ \ / /
| |___| (_) | (_| |__/ (_| (_) \ V /
 \ _____\___ / \ __,_|\___ |\ ___\___ / \_/
                              Bash-20200910-5a68dc2

x> No CI provider detected.
    Testing inside Docker? http://docs.codecov.io/docs/testing-with-docker
    Testing with Tox? https://docs.codecov.io/docs/python#section-testing-with-tox
    project root: .
    Fixing merge commit SHA
--> token set from env
    Yaml found at: .codecov.yml
==> Running gcov in . (disable via -X gcov)
==> Python coveragepy not found
==> Searching for coverage reports in:
    + /h
    -> Found 869 reports
==> Detecting git/mercurial file structure
==> Reading reports
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/execroot/com_github_googleapis_google_cloud_cpp/bazel-out/k8-fastbuild/testlogs/pubsub_client/baseline_coverage.dat bytes=9821
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/execroot/com_github_googleapis_google_cloud_cpp/bazel-out/k8-fastbuild/testlogs/spanner_client/baseline_coverage.dat bytes=10846
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/execroot/com_github_googleapis_google_cloud_cpp/bazel-out/k8-fastbuild/testlogs/storage_client/baseline_coverage.dat bytes=13637
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/execroot/com_github_googleapis_google_cloud_cpp/bazel-out/k8-fastbuild/testlogs/bigtable_client/baseline_coverage.dat bytes=9809
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/execroot/com_github_googleapis_google_cloud_cpp/bazel-out/k8-fastbuild/testlogs/google/cloud/future_void_test/coverage.dat bytes=71643
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/execroot/com_github_googleapis_google_cloud_cpp/bazel-out/k8-fastbuild/testlogs/google/cloud/future_void_test/baseline_coverage.dat bytes=4416
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/execroot/com_github_googleapis_google_cloud_cpp/bazel-out/k8-fastbuild/testlogs/google/cloud/future_generic_test/coverage.dat bytes=71261
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/execroot/com_github_googleapis_google_cloud_cpp/bazel-out/k8-fastbuild/testlogs/google/cloud/future_generic_test/baseline_coverage.dat bytes=4416
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/execroot/com_github_googleapis_google_cloud_cpp/bazel-out/k8-fastbuild/testlogs/google/cloud/internal_async_retry_unary_rpc_test/coverage.dat bytes=251749
...
[snip]
...
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/execroot/com_github_googleapis_google_cloud_cpp/bazel-out/k8-fastbuild/testlogs/generator/google_cloud_cpp_generator/baseline_coverage.dat bytes=5283
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/external/io_bazel_rules_go/tests/core/nogo/coverage/coverage_target_test.go bytes=29
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/external/io_bazel_rules_go/tests/core/coverage/coverage_test.go bytes=70
    + /h/.cache/bazel/_bazel_kbuilder/a7ecd8237744645c5d189c197108d6d2/external/@remote_coverage_tools.marker bytes=106
==> Appending adjustments
    https://docs.codecov.io/docs/fixing-reports
    + Found adjustments
==> Gzipping contents
==> Uploading reports
    url: https://codecov.io
    query: branch=pull_branch&commit=82daaace24c8bf3fa890b2c222a4c4f360555beb&build=2115&build_url=&name=&tag=&slug=googleapis%2Fgoogle-cloud-cpp&service=&flags=&pr=5070&job=2115&cmd_args=s
-> Pinging Codecov
https://codecov.io/upload/v4?package=bash-20200910-5a68dc2&token=secret&branch=pull_branch&commit=82daaace24c8bf3fa890b2c222a4c4f360555beb&build=2115&build_url=&name=&tag=&slug=googleapis%2Fgoogle-cloud-cpp&service=&flags=&pr=5070&job=2115&cmd_args=s
-> Uploading to
https://storage.googleapis.com/codecov/v4/raw/2020-09-17/A6A6358C08BED374DB3FEE6AD1B038DF/82daaace24c8bf3fa890b2c222a4c4f360555beb/8a2295c6-46cd-4e26-b941-87fff0c60b09.txt?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=GOOG1EQX6OZVJGHKK3633AAFGLBUCOOATRACRQRQF6HMSMLYUP6EAD6XSWAAY%2F20200917%2FUS%2Fs3%2Faws4_request&X-Amz-Date=20200917T015228Z&X-Amz-Expires=10&X-Amz-SignedHeaders=host&X-Amz-Signature=7d01afcc92d892b7217e4c793b3226916fd1a63ad7420b27897de8d2ce2e260b
  % Total % Received % Xferd Average Speed Time Time Time Current
                                 Dload Upload Total Spent Left Speed

  0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
100 39.2M 0 0 100 39.2M 0 69.3M --:--:-- --:--:-- --:--:-- 69.2M
100 39.2M 0 0 100 39.2M 0 69.3M --:--:-- --:--:-- --:--:-- 69.2M
    -> View reports at https://codecov.io/github/googleapis/google-cloud-cpp/commit/82daaace24c8bf3fa890b2c222a4c4f360555beb

```

The full output is available at the bottom of this log file: [https://source.cloud.google.com/results/invocations/283e0ca6-41c2-41cb-aa67-4f5d4941ff84/targets/cloud-cpp%2Fgithub%2Fgoogle-cloud-cpp%2Fmaster%2Fdocker%2Fcoverage-presubmit/log](https://source.cloud.google.com/results/invocations/283e0ca6-41c2-41cb-aa67-4f5d4941ff84/targets/cloud-cpp%2Fgithub%2Fgoogle-cloud-cpp%2Fmaster%2Fdocker%2Fcoverage-presubmit/log)

### Additional Information

This appears to work sometimes. As you can from the commits in this PR [Codecov](https://codecov.io/gh/googleapis/google-cloud-cpp/pull/5070), some of them do process the code coverage info. I’ve no idea why it fails sometimes, and I have no idea how to debug this or where to look for errors.

---

<div class="post-metadata">

**Author:** ![devjgm](https://avatars.discourse-cdn.com/v4/letter/d/65b543/32.png) [@devjgm](https://community.codecov.com/u/devjgm)\
**Post date:** [September 17, 2020, 6:37pm UTC](https://community.codecov.com/t/help-debugging-there-was-an-error-processing-coverage-reports/1984/2 "2020-09-17T18:37:04Z")

</div>

Note that the coverage report that gets uploaded is about 40MB compressed, and about 900MB uncompressed. Is that exceeding some size limit that’s causing this error?

---

<div class="post-metadata">

**Author:** ![tom](https://yyz1.discourse-cdn.com/flex029/user_avatar/community.codecov.com/tom/32/8_2.png) [@tom](https://community.codecov.com/u/tom)\
**Post date:** [September 22, 2020, 3:41pm UTC](https://community.codecov.com/t/help-debugging-there-was-an-error-processing-coverage-reports/1984/3 "2020-09-22T15:41:54Z")

</div>

@devjgm I am 99% sure that is the case (that the upload is massive). Do you have any way of breaking this up into separate reports?

---

<div class="post-metadata">

**Author:** ![devjgm](https://avatars.discourse-cdn.com/v4/letter/d/65b543/32.png) [@devjgm](https://community.codecov.com/u/devjgm)\
**Post date:** [September 22, 2020, 9:57pm UTC](https://community.codecov.com/t/help-debugging-there-was-an-error-processing-coverage-reports/1984/4 "2020-09-22T21:57:03Z")

</div>

I solved this issue by merging all the `coverage.dat` files into a single merged lcov file. The filesize dropped from 900MB to ~16 MB, and everything seems to be working now.

So, even though I think [codecov.io](http://codecov.io) officially has no file size limit, it appears that there actually are some limits you’ll bump into with very large files. My wild guess is that their backend processing pipeline (or whatever) was hitting some timeout while trying to munge a 900MB coverage file.