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

[Peter Collingbourne via llvm-commits]

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

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


>From e7c7398f66325db836877d91c4cbe88430169dfc Mon Sep 17 00:00:00 2001
From: Peter Collingbourne <peter at pcc.me.uk>
Date: Tue, 9 Jun 2026 20:02:26 -0700
Subject: [PATCH] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20initia?=
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Created using spr 1.3.6-beta.1
---
 compiler-rt/lib/lsan/lsan_common.cpp | 3 +++
 1 file changed, 3 insertions(+)

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;