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Update reproducing.md

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@ -4,6 +4,7 @@ You've been CC'ed on an OSS-Fuzz issue
([examples](https://bugs.chromium.org/p/oss-fuzz/issues/list?can=1&q=Type%3ABug%2CBug-Security)), now what?
Before attempting to fix the bug, you should be able to reliably reproduce it.
## Fuzz target bugs
Every issue has a [reproducer](glossary.md#reproducer) (aka "testcase") file attached.
Download it. If the issue is not public, you will need to login using your
[Google account](https://support.google.com/accounts/answer/176347?hl=en)
@ -28,18 +29,20 @@ If you are not sure how to build the fuzzer using the project's build system,
you may also use Docker ([how?](installing_docker.md), [why?](faq.md#why-do-you-use-docker)) commands
to replicate the exact build steps used by OSS-Fuzz and then feed the reproducer input to the fuzz target.
## Building using Docker
## Build failures
We will also report build failures for your project. To reproduce these, follow the [Building using docker](#building-using-docker) and if necessary the [Reproducing build checks](reproducing-build-checks) sections below.
## Building using Docker
```bash
$ python infra/helper.py build_image $PROJECT_NAME
$ python infra/helper.py build_fuzzers --sanitizer <address/memory/undefined> $PROJECT_NAME
```
## Reproducing build checks
Our infrastructure runs some sanity tests to make sure that your build was correctly configured. To reproduce these locally, run:
Our infrastructure runs some sanity tests to make sure that your build was correctly configured, even if it succeeded. To reproduce these locally, run:
```bash
$ python infra/helper.py check_build --sanitizer <address/memory/undefined> $PROJECT_NAME $FUZZER_NAME
$ python infra/helper.py check_build --sanitizer <address/memory/undefined> $PROJECT_NAME <fuzz_target_name>
```
## Reproducing bugs