[compiler-rt] r191522 - [LSan] Don't report leaks with single-frame stack traces
Alexey Samsonov
samsonov at google.com
Fri Sep 27 06:54:20 PDT 2013
Author: samsonov
Date: Fri Sep 27 08:54:20 2013
New Revision: 191522
URL: http://llvm.org/viewvc/llvm-project?rev=191522&view=rev
Log:
[LSan] Don't report leaks with single-frame stack traces
Added:
compiler-rt/trunk/lib/lsan/lit_tests/TestCases/swapcontext.cc
Modified:
compiler-rt/trunk/lib/lsan/lsan_common.cc
Added: compiler-rt/trunk/lib/lsan/lit_tests/TestCases/swapcontext.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/lsan/lit_tests/TestCases/swapcontext.cc?rev=191522&view=auto
==============================================================================
--- compiler-rt/trunk/lib/lsan/lit_tests/TestCases/swapcontext.cc (added)
+++ compiler-rt/trunk/lib/lsan/lit_tests/TestCases/swapcontext.cc Fri Sep 27 08:54:20 2013
@@ -0,0 +1,42 @@
+// We can't unwind stack if we're running coroutines on heap-allocated
+// memory. Make sure we don't report these leaks.
+
+// RUN: %clangxx_lsan %s -o %t
+// RUN: %t 2>&1
+// RUN: not %t foo 2>&1 | FileCheck %s
+
+#include <stdio.h>
+#include <ucontext.h>
+#include <unistd.h>
+
+const int kStackSize = 1 << 20;
+
+void Child() {
+ int child_stack;
+ printf("Child: %p\n", &child_stack);
+ int *leaked = new int[666];
+}
+
+int main(int argc, char *argv[]) {
+ char stack_memory[kStackSize + 1];
+ char *heap_memory = new char[kStackSize + 1];
+ char *child_stack = (argc > 1) ? stack_memory : heap_memory;
+
+ printf("Child stack: %p\n", child_stack);
+ ucontext_t orig_context;
+ ucontext_t child_context;
+ getcontext(&child_context);
+ child_context.uc_stack.ss_sp = child_stack;
+ child_context.uc_stack.ss_size = kStackSize / 2;
+ child_context.uc_link = &orig_context;
+ makecontext(&child_context, Child, 0);
+ if (swapcontext(&orig_context, &child_context) < 0) {
+ perror("swapcontext");
+ return 1;
+ }
+
+ delete[] heap_memory;
+ return 0;
+}
+
+// CHECK: SUMMARY: LeakSanitizer: 2664 byte(s) leaked in 1 allocation(s)
Modified: compiler-rt/trunk/lib/lsan/lsan_common.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/lsan/lsan_common.cc?rev=191522&r1=191521&r2=191522&view=diff
==============================================================================
--- compiler-rt/trunk/lib/lsan/lsan_common.cc (original)
+++ compiler-rt/trunk/lib/lsan/lsan_common.cc Fri Sep 27 08:54:20 2013
@@ -295,10 +295,14 @@ static void CollectLeaksCb(uptr chunk, v
LsanMetadata m(chunk);
if (!m.allocated()) return;
if (m.tag() == kDirectlyLeaked || m.tag() == kIndirectlyLeaked) {
+ uptr size = 0;
+ const uptr *trace = StackDepotGet(m.stack_trace_id(), &size);
+ // Ignore leaks with one-frame stack traces (which often come from
+ // coroutines) - they are not actionable.
+ if (size <= 1)
+ return;
uptr resolution = flags()->resolution;
if (resolution > 0) {
- uptr size = 0;
- const uptr *trace = StackDepotGet(m.stack_trace_id(), &size);
size = Min(size, resolution);
leak_report->Add(StackDepotPut(trace, size), m.requested_size(), m.tag());
} else {
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