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fbf5830bb2
Valgrind is complaining about use of uninitialized memory in absl::GetStackTrace, and the cases where it complains the backtraces are incomplete. Note: this means that jemalloc heap profiling no longer works out of the box. Advanced users who want to enable jemalloc heap profiling will now have to revert this change and build from source.
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
/*
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* SignalSafeUnwind.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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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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#include "flow/SignalSafeUnwind.h"
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int64_t dl_iterate_phdr_calls = 0;
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#if defined(__linux__) && !defined(USE_SANITIZER)
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#include <link.h>
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#include <mutex>
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static int (*chain_dl_iterate_phdr)(int (*callback)(struct dl_phdr_info* info, size_t size, void* data),
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void* data) = nullptr;
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static void initChain() {
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static std::once_flag flag;
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// Ensure that chain_dl_iterate_phdr points to the "real" function that we are overriding
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std::call_once(flag, []() { *(void**)&chain_dl_iterate_phdr = dlsym(RTLD_NEXT, "dl_iterate_phdr"); });
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if (!chain_dl_iterate_phdr) {
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criticalError(FDB_EXIT_ERROR, "SignalSafeUnwindError", "Unable to find dl_iterate_phdr symbol");
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}
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}
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// This overrides the function in libc!
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extern "C" int dl_iterate_phdr(int (*callback)(struct dl_phdr_info* info, size_t size, void* data), void* data) {
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interlockedIncrement64(&dl_iterate_phdr_calls);
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initChain();
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setProfilingEnabled(0);
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int result = chain_dl_iterate_phdr(callback, data);
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setProfilingEnabled(1);
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return result;
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}
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#endif |