ThreadSanitizer (TSan) is a data race detector for C/C++ programs.
ThreadSanitizer (aka tsan, not "Thread Sanitizer") is a data race detector for C/C++ programs.
See also:
Questions tagged [thread-sanitizer]
91 questions
5
votes
0 answers
TSan race disappears with alignas(32)
I have an implementation of a lockfree queue, which I believe to be correct (or at least data race-free):
#include
#include
#include
#include
struct Job {
int id;
int data;
};
class JobQueue {
using…
angelsl
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5
votes
2 answers
Thread safety of std::cout insertion operator
I've always thought that using std::cout << something was thread safe.
For this little example
#include
#include
void f()
{
std::cout << "Hello from f\n";
}
void g()
{
std::cout << "Hello from g\n";
}
int main()
{
…
Paul Floyd
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5
votes
3 answers
Xcode 11.2.1 Thread Sanitizer abort_with_payload
I'm trying to use the Thread Sanitizer in Xcode 11.2.1 but whenever the app launches (just a single view app from Xcode's template, nothing added) it hits __abort_with_payload:
libsystem_kernel.dylib`__abort_with_payload:
0x7fff51b73be0 <+0>: …
CMash
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5
votes
1 answer
GCC 4.9.1 ThreadSanitizer "As if synchronized via sleep"
I'm working on cleaning up ThreadSanitizer warnings in a largeish project. In particular in this exact case, there is a spawned thread which reads from a file, producer. Then there are one or more decompression threads as part of a thread pool.…
inetknght
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5
votes
2 answers
ThreadSanitizer reports "data race on operator delete(void*)" when using embedded reference counter
Please have a look at the following code:
#include
#include
class ReferenceCounted {
public:
ReferenceCounted() : ref_count_(1) {}
void reserve() {
ref_count_.fetch_add(1,…
Adam Romanek
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5
votes
2 answers
How to use clang thread sanitizer on OSX?
I am trying to use --thread-sanitizer option of clang on OSX:
$ clang++ -fthread-sanitizer -fpic tsan1.cc
Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.3.0
Thread model: posix
[...]
clang -cc1 version…
Maxim Razin
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4
votes
2 answers
Segfault in TSAN in Boost CI - Need the help of an expert
I am debugging A segfault reported by TSAN in the CI of Boost.Beast.
I strongly believe it to be a false positive, but I don't know what to look for in order to suppress it.
It seems to me from the stack trace that the code is correctly…
Richard Hodges
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4
votes
1 answer
How do I annotate seq-cst atomic fences for the thread sanitizer?
I learned that TSAN doesn't understand std::atomic_thread_fence, and to fix it, you need to tell TSAN which atomic variables are affected by the fence, by putting __tsan_acquire(void *) and __tsan_release(void *) next to it (for acquire and release…
HolyBlackCat
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4
votes
1 answer
How to find line number in ThreadSanitizer stack trace
I compile using Clang with -g3 and -O1 flags, but TSan complains that it found a data-race and it outputs a totally obscure stack trace with no clear line numbers.
How to find line numbers in this case?
Output on Pastebin since Stack Overflow…
jeffbRTC
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4
votes
2 answers
How to add breakpoint when thread sanitizer reports data-race?
There is a similar question for address sanitizers, but for thread sanitizers, it doesn't work, I have tried to break on __sanitizer_print_stack_trace, which doesn't work either.
prehistoricpenguin
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4
votes
0 answers
Dealing with a tsan lock-order-inversion false positive
I have code which is identified by tsan as lock-order-inversion. It is a false positive. I know I can use suppression files to prevent this but I wonder whether I can do something with my code so that my intention is clearer and it doesn't get…
Borislav Stanimirov
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4
votes
1 answer
How to detect thread sanitizer for gcc 5
How can I detect whether thread sanitizer has been turned on for a build using gcc 5? Neither one of the two between __has_feature(thread_sanitizer) nor __SANITIZE_THREAD__ work
#include
using std::cout;
using std::endl;
int main() {
…
Curious
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4
votes
1 answer
Missing libclang_rt.tsan-x86_64.a on clang-7.0
I am trying to hunt down some deadlock in multi-threaded code which uses a condition variable. Somebody advised using thread sanitizer. So I compiled LLVM from source and enabled thread sanitizer
LLVM built fine, but when I try to build my project…
Dženan
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4
votes
1 answer
write-write data race from a std::set insert() and find()?
To experiment with the thread-sanitizer, I created a tiny C++ program which by purpose contains a data race. Indeed, tsan does detect the error, great! However I am puzzled by the generated message...
It reports a write-write data race, where I…
Jos v E
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3
votes
0 answers
clang thread sanitizer reports issues when using conditon variables
Here is a simple example for using std::condition_variable. When using clang+tsan for building the following code,
#include
#include
#include
#include
#include
#include
class…
kamshi
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