[compiler-rt] lsan: Document that ptrace_scope needs to be disabled. (PR #202838)

[via llvm-commits]

llvmorg-github-actions[bot] wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: Peter Collingbourne (pcc)

<details>
<summary>Changes</summary>

As far as I'm aware, this is the reason why
http://45.33.8.238/linux/201640/step_9.txt is failing.


---
Full diff: https://github.com/llvm/llvm-project/pull/202838.diff


1 Files Affected:

- (modified) compiler-rt/lib/lsan/lsan_common.cpp (+3) 


``````````diff
diff --git a/compiler-rt/lib/lsan/lsan_common.cpp b/compiler-rt/lib/lsan/lsan_common.cpp
index 411291636d98f..0e8b013d73fe8 100644
--- a/compiler-rt/lib/lsan/lsan_common.cpp
+++ b/compiler-rt/lib/lsan/lsan_common.cpp
@@ -897,6 +897,9 @@ static bool CheckForLeaksOnce() {
       Report(
           "HINT: LeakSanitizer does not work under ptrace (strace, gdb, "
           "etc)\n");
+      Report(
+          "HINT: LeakSanitizer requires ptrace_scope to be disabled (e.g. echo "
+          "0 > /proc/sys/kernel/yama/ptrace_scope)\n");
       Die();
     }
     LeakReport leak_report;

``````````

</details>


https://github.com/llvm/llvm-project/pull/202838