1 files changed, 11 insertions, 2 deletions
diff --git a/compiler-rt/lib/lsan/lsan_common.cc b/compiler-rt/lib/lsan/lsan_common.cc
index 0385c37ac51..e88853cab05 100644
--- a/compiler-rt/lib/lsan/lsan_common.cc
+++ b/compiler-rt/lib/lsan/lsan_common.cc
@@ -221,9 +221,18 @@ static void ProcessThreads(SuspendedThreadsList const &suspended_threads,
       LOG_THREADS("Stack at %p-%p (SP = %p).\n", stack_begin, stack_end, sp);
       if (sp < stack_begin || sp >= stack_end) {
         // SP is outside the recorded stack range (e.g. the thread is running a
-        // signal handler on alternate stack). Again, consider the entire stack
-        // range to be reachable.
+        // signal handler on alternate stack, or swapcontext was used).
+        // Again, consider the entire stack range to be reachable.
         LOG_THREADS("WARNING: stack pointer not in stack range.\n");
+        uptr page_size = GetPageSizeCached();
+        int skipped = 0;
+        while (stack_begin < stack_end &&
+               !IsAccessibleMemoryRange(stack_begin, 1)) {
+          skipped++;
+          stack_begin += page_size;
+        }
+        LOG_THREADS("Skipped %d guard page(s) to obtain stack %p-%p.\n",
+                    skipped, stack_begin, stack_end);
       } else {
         // Shrink the stack range to ignore out-of-scope values.
         stack_begin = sp;