[compiler-rt] [asan] Improve manual poison reporting (PR #195666)

[Vitaly Buka via llvm-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/195666

Always print the thread ID that poisoned the memory, even if the
stack trace is unavailable.


>From 56eea2054063efd9eb983ab6df782ebde8a0f261 Mon Sep 17 00:00:00 2001
From: Vitaly Buka <vitalybuka at google.com>
Date: Mon, 4 May 2026 08:20:50 -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 1.3.7
---
 compiler-rt/lib/asan/asan_errors.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/compiler-rt/lib/asan/asan_errors.cpp b/compiler-rt/lib/asan/asan_errors.cpp
index c4100cf7244e3..364dd6d494c2d 100644
--- a/compiler-rt/lib/asan/asan_errors.cpp
+++ b/compiler-rt/lib/asan/asan_errors.cpp
@@ -674,11 +674,10 @@ static void CheckPoisonRecords(uptr addr) {
 
   PoisonRecord record;
   if (FindPoisonRecord(addr, record)) {
+    Printf("Memory was manually poisoned by thread T%u:\n", record.thread_id);
     StackTrace poison_stack = StackDepotGet(record.stack_id);
-    if (poison_stack.size > 0) {
-      Printf("Memory was manually poisoned by thread T%u:\n", record.thread_id);
+    if (poison_stack.size > 0)
       poison_stack.Print();
-    }
   } else {
     Printf("ERROR: no matching poison tracking record found.\n");
     Printf("Try a larger value for ASAN_OPTIONS=poison_history_size=<size>.\n");