| Issue |
180822
|
| Summary |
[TSan] Missed location information
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
DrSergei
|
I found regression between clang in master and system clang (18.1.3 Ubuntu 24) in TSan when location information is missed.
main.cpp:
```c++
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
long my_global_variable; // global variable
void *f1(void *p) {
my_global_variable = 42;
return NULL;
}
void *f2(void *p) {
my_global_variable = 43;
return NULL;
}
int main (int argc, char const *argv[])
{
pthread_t t1;
pthread_create(&t1, NULL, f1, NULL);
pthread_t t2;
pthread_create(&t2, NULL, f2, NULL);
pthread_join(t1, NULL);
pthread_join(t2, NULL);
return 0;
}
```
output:
```sh
sergei@DrSergei:~/test$ clang++ --version
Ubuntu clang version 18.1.3 (1ubuntu1)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
sergei@DrSergei:~/test$ clang++ -g -fsanitize=thread main.cpp -o main.exe
sergei@DrSergei:~/test$ ./main.exe
==================
WARNING: ThreadSanitizer: data race (pid=556025)
Write of size 8 at 0x555556a60aa8 by thread T2:
#0 f2(void*) /home/sergei/test/main.cpp:14:24 (main.exe+0xe0b08) (BuildId: 031b8bfb9def44034282a8f7be3fc92ccb67754c)
Previous write of size 8 at 0x555556a60aa8 by thread T1:
#0 f1(void*) /home/sergei/test/main.cpp:9:24 (main.exe+0xe0ab8) (BuildId: 031b8bfb9def44034282a8f7be3fc92ccb67754c)
Location is global 'my_global_variable' of size 8 at 0x555556a60aa8 (main.exe+0x150caa8)
Thread T2 (tid=556031, running) created by main thread at:
#0 pthread_create <null> (main.exe+0x605ef) (BuildId: 031b8bfb9def44034282a8f7be3fc92ccb67754c)
#1 main /home/sergei/test/main.cpp:24:5 (main.exe+0xe0b92) (BuildId: 031b8bfb9def44034282a8f7be3fc92ccb67754c)
Thread T1 (tid=556030, finished) created by main thread at:
#0 pthread_create <null> (main.exe+0x605ef) (BuildId: 031b8bfb9def44034282a8f7be3fc92ccb67754c)
#1 main /home/sergei/test/main.cpp:21:5 (main.exe+0xe0b7b) (BuildId: 031b8bfb9def44034282a8f7be3fc92ccb67754c)
SUMMARY: ThreadSanitizer: data race /home/sergei/test/main.cpp:14:24 in f2(void*)
==================
ThreadSanitizer: reported 1 warnings
sergei@DrSergei:~/test$ /home/sergei/llvm-project/build/bin/clang++ -g -fsanitize=thread main.cpp -o main.exe
sergei@DrSergei:~/test$ ./main.exe
==================
WARNING: ThreadSanitizer: data race (pid=556105)
Write of size 8 at 0x5555569ec798 by thread T2:
#0 f2(void*) /home/sergei/test/main.cpp:14 (main.exe+0xea618)
Previous write of size 8 at 0x5555569ec798 by thread T1:
#0 f1(void*) /home/sergei/test/main.cpp:9 (main.exe+0xea5c8)
Thread T2 (tid=556108, running) created by main thread at:
#0 pthread_create /home/sergei/llvm-project/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp:1078 (main.exe+0x64aaa)
#1 main /home/sergei/test/main.cpp:24 (main.exe+0xea6a2)
Thread T1 (tid=556107, finished) created by main thread at:
#0 pthread_create /home/sergei/llvm-project/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp:1078 (main.exe+0x64aaa)
#1 main /home/sergei/test/main.cpp:21 (main.exe+0xea68b)
SUMMARY: ThreadSanitizer: data race /home/sergei/test/main.cpp:14 in f2(void*)
==================
ThreadSanitizer: reported 1 warnings
```
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