Document workaround for SAST failures

There's an error that occurs when the Docker version used to run the
SAST job is 19.03.00, and the job will fail. Advise the users what to
do in case they bump into this.

doc/user/application_security/dependency_scanning/index.md

@@ -46,6 +46,10 @@ To run a Dependency Scanning job, you need GitLab Runner with the
 executor running in privileged mode. If you're using the shared Runners on GitLab.com,
 this is enabled by default.
 
+CAUTION: **Caution:**
+If you use your own Runners, make sure that the Docker version you have installed
+is **not** `19.03.00`. See [troubleshooting information](#error-response-from-daemon-error-processing-tar-file-docker-tar-relocation-error) for details.
+
 ## Supported languages and package managers
 
 The following languages and dependency managers are supported.
@@ -343,14 +347,11 @@ You can search the [gemnasium-db](https://gitlab.com/gitlab-org/security-product
 to find a vulnerability in the Gemnasium database.
 You can also [submit new vulnerabilities](https://gitlab.com/gitlab-org/security-products/gemnasium-db/blob/master/CONTRIBUTING.md).
 
-<!-- ## Troubleshooting
+## Troubleshooting
 
-Include any troubleshooting steps that you can foresee. If you know beforehand what issues
-one might have when setting this up, or when something is changed, or on upgrading, it's
-important to describe those, too. Think of things that may go wrong and include them here.
-This is important to minimize requests for support, and to avoid doc comments with
-questions that you know someone might ask.
+### Error response from daemon: error processing tar file: docker-tar: relocation error
 
-Each scenario can be a third-level heading, e.g. `### Getting error message X`.
-If you have none to add when creating a doc, leave this section in place
-but commented out to help encourage others to add to it in the future. -->
+This error occurs when the Docker version used to run the SAST job is `19.03.00`.
+You are advised to update to Docker `19.03.01` or greater. Older versions are not
+affected. Read more in
+[this issue](https://gitlab.com/gitlab-org/gitlab-ee/issues/13830#note_211354992 "Current SAST container fails").

doc/user/application_security/sast/index.md

@@ -51,6 +51,10 @@ To run a SAST job, you need GitLab Runner with the
 executor running in privileged mode. If you're using the shared Runners on GitLab.com,
 this is enabled by default.
 
+CAUTION: **Caution:**
+If you use your own Runners, make sure that the Docker version you have installed
+is **not** `19.03.00`. See [troubleshooting information](#error-response-from-daemon-error-processing-tar-file-docker-tar-relocation-error) for details.
+
 ## Supported languages and frameworks
 
 The following table shows which languages, package managers and frameworks are supported and which tools are used.
@@ -350,14 +354,11 @@ Once a vulnerability is found, you can interact with it. Read more on how to
 For more information about the vulnerabilities database update, check the
 [maintenance table](../index.md#maintenance-and-update-of-the-vulnerabilities-database).
 
-<!-- ## Troubleshooting
+## Troubleshooting
 
-Include any troubleshooting steps that you can foresee. If you know beforehand what issues
-one might have when setting this up, or when something is changed, or on upgrading, it's
-important to describe those, too. Think of things that may go wrong and include them here.
-This is important to minimize requests for support, and to avoid doc comments with
-questions that you know someone might ask.
+### Error response from daemon: error processing tar file: docker-tar: relocation error
 
-Each scenario can be a third-level heading, e.g. `### Getting error message X`.
-If you have none to add when creating a doc, leave this section in place
-but commented out to help encourage others to add to it in the future. -->
+This error occurs when the Docker version used to run the SAST job is `19.03.00`.
+You are advised to update to Docker `19.03.01` or greater. Older versions are not
+affected. Read more in
+[this issue](https://gitlab.com/gitlab-org/gitlab-ee/issues/13830#note_211354992 "Current SAST container fails").