Merge pull request #75451 from swiftlang/lsan-failure-symbolication-doc

[docs] Improve documentation on LSAN failure symbolication

Author: ahoppen

docs/LSANFailureSymbolication.md

@@ -2,11 +2,12 @@
 
 ### Create Ubuntu Container 
 
-1. Clone (or pull) swift-docker: https://github.com/swiftlang/swift-docker
-2. Build the Ubuntu 18.04 container: `cd swift-ci/master/ubuntu/18.04; docker build .`
-3. `docker run -it --cpus <CPUs> --memory <Memory> -v ~/<path to your local sources>:/src-on-host:cached --name lsan-reproducer --cap-add=SYS_PTRACE --security-opt seccomp=unconfined <hash that docker build outputs> bash`
+1. Use an x86 machine. The following instructions currently don’t work on arm64. It might be easy to adjust them or not, I have not tried
+2. Clone (or pull) swift-docker: https://github.com/swiftlang/swift-docker
+3. Build the Ubuntu 22.04 container: `cd swift-ci/master/ubuntu/22.04; docker build .`
+4. `docker run -it --cpus <CPUs> --memory <Memory> -v ~/<path to your local sources>:/src-on-host:cached --name lsan-reproducer --cap-add=SYS_PTRACE --security-opt seccomp=unconfined <hash that docker build outputs> bash`
     - The `-cap-add` and `-security-opt` arguments are needed to run LLDB inside the Docker container
-4. Copy the sources to inside the Docker container: `cp -r /src-on-host/* ~`
+5. Copy the sources to inside the Docker container: `cp -r /src-on-host/* ~`
     - We need to to this because the build needs a case-sensitive file system and your host machine probably has a case-insensitive file system
 
 Build inside the Container