71ba5899ae
We saw crashes from pthread_exit+debuggerd on LP32 (https://issuetracker.google.com/72291624), and it seems like the equivalent problem should exist with system(3). I fixed posix_spawn(3) as part of that bug, so the easiest fix is probably to reuse that. Bug: http://b/72470344 Test: ran tests Change-Id: I05f838706f2b4a14ac3ee21292833e6c8579b0d4
125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Contributed by: Intel Corporation
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*/
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#include <gtest/gtest.h>
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#include <dlfcn.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <unwind.h>
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#include "SignalUtils.h"
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#define noinline __attribute__((__noinline__))
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#define __unused __attribute__((__unused__))
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_Unwind_Reason_Code FrameCounter(_Unwind_Context* ctx __unused, void* arg) {
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int* count_ptr = reinterpret_cast<int*>(arg);
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#if SHOW_FRAME_LOCATIONS
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void* ip = reinterpret_cast<void*>(_Unwind_GetIP(ctx));
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const char* symbol = "<unknown>";
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int offset = 0;
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Dl_info info;
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memset(&info, 0, sizeof(info));
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if (dladdr(ip, &info) != 0) {
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symbol = info.dli_sname;
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if (info.dli_saddr != nullptr) {
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offset = static_cast<int>(reinterpret_cast<char*>(ip) - reinterpret_cast<char*>(info.dli_saddr));
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}
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}
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fprintf(stderr, " #%02d %p %s%+d (%s)\n", *count_ptr, ip, symbol, offset, info.dli_fname ? info.dli_fname : "??");
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fflush(stderr);
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#endif
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++*count_ptr;
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return _URC_NO_REASON;
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}
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static int noinline unwind_one_frame_deeper() {
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int count = 0;
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_Unwind_Backtrace(FrameCounter, &count);
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return count;
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}
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TEST(stack_unwinding, easy) {
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int count = 0;
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_Unwind_Backtrace(FrameCounter, &count);
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int deeper_count = unwind_one_frame_deeper();
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ASSERT_EQ(count + 1, deeper_count);
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}
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struct UnwindData {
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volatile bool signal_handler_complete = false;
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int expected_frame_count = 0;
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int handler_frame_count = 0;
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int handler_one_deeper_frame_count = 0;
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};
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static UnwindData g_unwind_data;
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static void noinline UnwindSignalHandler(int) {
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_Unwind_Backtrace(FrameCounter, &g_unwind_data.handler_frame_count);
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g_unwind_data.handler_one_deeper_frame_count = unwind_one_frame_deeper();
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g_unwind_data.signal_handler_complete = true;
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}
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static void verify_unwind_data(const UnwindData& unwind_data) {
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// In order to avoid a false positive, the caller must have at least 2 frames
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// outside of the signal handler. This avoids a case where the only frame
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// right after the signal handler winds up being garbage.
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EXPECT_GT(unwind_data.handler_frame_count, unwind_data.expected_frame_count + 1);
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EXPECT_EQ(unwind_data.handler_frame_count + 1, unwind_data.handler_one_deeper_frame_count);
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}
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static void noinline UnwindTest() {
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g_unwind_data = {};
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_Unwind_Backtrace(FrameCounter, &g_unwind_data.expected_frame_count);
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ASSERT_LE(2, g_unwind_data.expected_frame_count)
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<< "The current call must contain at least 2 frames for the test to be valid.";
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ASSERT_EQ(0, kill(getpid(), SIGUSR1));
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while (!g_unwind_data.signal_handler_complete) {}
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verify_unwind_data(g_unwind_data);
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}
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TEST(stack_unwinding, unwind_through_signal_frame) {
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ScopedSignalHandler ssh(SIGUSR1, UnwindSignalHandler);
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UnwindTest();
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}
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// On LP32, the SA_SIGINFO flag gets you __restore_rt instead of __restore.
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TEST(stack_unwinding, unwind_through_signal_frame_SA_SIGINFO) {
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ScopedSignalHandler ssh(SIGUSR1, UnwindSignalHandler, SA_SIGINFO);
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UnwindTest();
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}
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