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authorGravatar Abseil Team <absl-team@google.com>2019-08-08 10:56:58 -0700
committerGravatar CJ Johnson <johnsoncj@google.com>2019-08-08 14:19:45 -0400
commitaa844899c937bde5d2b24f276b59997e5b668bde (patch)
treecd18e64150abc74b85bbbf6abf990f66fa47cacd /absl/debugging/internal/stacktrace_generic-inl.inc
parentfcb104594b0bb4b8ac306cb2f55ecdad40974683 (diff)
Creation of LTS branch "lts_2019_08_08"20190808
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Diffstat (limited to 'absl/debugging/internal/stacktrace_generic-inl.inc')
-rw-r--r--absl/debugging/internal/stacktrace_generic-inl.inc40
1 files changed, 38 insertions, 2 deletions
diff --git a/absl/debugging/internal/stacktrace_generic-inl.inc b/absl/debugging/internal/stacktrace_generic-inl.inc
index 823942af..39c47866 100644
--- a/absl/debugging/internal/stacktrace_generic-inl.inc
+++ b/absl/debugging/internal/stacktrace_generic-inl.inc
@@ -12,13 +12,47 @@
#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_
#include <execinfo.h>
+#include <atomic>
#include <cstring>
#include "absl/debugging/stacktrace.h"
+// Sometimes, we can try to get a stack trace from within a stack
+// trace, because we don't block signals inside this code (which would be too
+// expensive: the two extra system calls per stack trace do matter here).
+// That can cause a self-deadlock.
+// Protect against such reentrant call by failing to get a stack trace.
+//
+// We use __thread here because the code here is extremely low level -- it is
+// called while collecting stack traces from within malloc and mmap, and thus
+// can not call anything which might call malloc or mmap itself.
+static __thread int recursive = 0;
+
+// The stack trace function might be invoked very early in the program's
+// execution (e.g. from the very first malloc if using tcmalloc). Also, the
+// glibc implementation itself will trigger malloc the first time it is called.
+// As such, we suppress usage of backtrace during this early stage of execution.
+static std::atomic<bool> disable_stacktraces(true); // Disabled until healthy.
+// Waiting until static initializers run seems to be late enough.
+// This file is included into stacktrace.cc so this will only run once.
+static int stacktraces_enabler = []() {
+ void* unused_stack[1];
+ // Force the first backtrace to happen early to get the one-time shared lib
+ // loading (allocation) out of the way. After the first call it is much safer
+ // to use backtrace from a signal handler if we crash somewhere later.
+ backtrace(unused_stack, 1);
+ disable_stacktraces.store(false, std::memory_order_relaxed);
+ return 0;
+}();
+
template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
const void *ucp, int *min_dropped_frames) {
+ if (recursive || disable_stacktraces.load(std::memory_order_relaxed)) {
+ return 0;
+ }
+ ++recursive;
+
static_cast<void>(ucp); // Unused.
static const int kStackLength = 64;
void * stack[kStackLength];
@@ -46,17 +80,19 @@ static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
}
}
+ --recursive;
+
return result_count;
}
namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
namespace debugging_internal {
bool StackTraceWorksForTest() {
return true;
}
} // namespace debugging_internal
-} // inline namespace lts_2018_12_18
+} // inline namespace lts_2019_08_08
} // namespace absl
#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_