[docs] Add instructions on "pull_images" and "check_build" as per suggestion in #1330. (#1404)

* [docs] Add instructions on "pull_images" and "check_build" as per suggestion in #1330.

* Address review feedback

* fix a typo

1 files changed, 23 insertions, 2 deletions

diff --git a/docs/reproducing.md b/docs/reproducing.md
index 109b22ca..1f74af92 100644
--- a/docs/reproducing.md
+++ b/docs/reproducing.md
@@ -29,8 +29,19 @@ 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.
 
-## 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.
+### Pull the latest Docker images
+
+```bash
+$ python infra/helper.py pull_images
+```
+
+  Docker images get regularly updated with a newer version of build tools, build
+  configurations, scripts, and other changes. In some cases, a particular issue
+  can be reproduced only with a fresh image being used.
+
+### Reproduce crashes with Docker
+
+- *Reproduce using latest OSS-Fuzz build:*
 
 ## Building using Docker
 ```bash
@@ -67,7 +78,17 @@ $ python infra/helper.py reproduce $PROJECT_NAME <fuzz_target_name> <testcase_pa
 ```
 
   This is essentially the previous command that additionally mounts local sources into the running container.
+
 - *Fix issue*. Write a patch to fix the issue in your local checkout and then use the previous command to verify the fix (i.e. no crash occurred). 
    [Use gdb](debugging.md#debugging-fuzzers-with-gdb) if needed.
 - *Submit fix*. Submit the fix in the project's repository. ClusterFuzz will automatically pick up the changes, recheck the testcase and will close the issue (in &lt; 1 day).
 - *Improve fuzzing support*. Consider [improving fuzzing support](ideal_integration.md) in your project's build and test system.
+
+
+### Reproducing OSS-Fuzz bad build failures
+
+```bash
+$ python infra/helper.py build_image $PROJECT_NAME
+$ python infra/helper.py build_fuzzers --sanitizer <address/memory/undefined> $PROJECT_NAME
+$ python infra/helper.py check_build $PROJECT_NAME <fuzz_target_name>
+```