| Issue |
161443
|
| Summary |
Missing tsan interceptor for _longjmp on Mac
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
rmacnak-google
|
There is an interceptor for `_setjmp` but not `_longjmp`. The causes `_longjmp` to fail to restore the `__tsan_func_entry`/`__tsan_func_exit` stack to its position at `_setjmp` and can eventually result in overflow and internal TSAN crashes.
Discovered when addressing https://github.com/dart-lang/sdk/issues/61536.
```c
#include <setjmp.h>
__attribute__((noinline))
void foo(jmp_buf* buf) {
_longjmp(*buf, 1);
}
int main() {
jmp_buf buf;
for (int i = 0; i < 10000000; i++) {
if (_setjmp(buf) == 0) {
foo(&buf);
}
}
}
```
This small example crashes with `_setjmp`/`_longjmp`, but works with `setjmp`/`longjmp`.
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