From timurrrr.com on April 05, 2010 10:50:58
I've been testing Chromium base_unittests under DrMemory 1.0.10 on Windows and sometimes it was giving me some strange reports when threads were created. I was able to reproduce these reports by running ThreadSanitizer unittests. Here is a short reproducer:
include
include
class MyThread { public: typedef void (*worker_t)();
MyThread(worker_t worker, const char *name = NULL) :w_(worker), name_(name) {}
~MyThread(){}
void Start() { DWORD thr_id = 0; t_ = ::CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadBody, this, 0, &thr_id); // Line 15 }
void Join() { ::WaitForSingleObject(t_, INFINITE); }
HANDLE tid() const { return t_; }
private:
static DWORD WINAPI ThreadBody(MyThread my_thread) {
if (my_thread->name_) { // Line 25
printf("Started thread '%s'\n", my_thread->name_);
}
my_thread->w_(); // Line 28
return 0;
}
HANDLE t_;
worker_t w_;
const char name_;
};
void foo() { printf("foo()\n"); }
int main() { MyThread mt(foo); mt.Start(); mt.Join(); // Line 43 return 0; }
To my mind, this code doesn't have any uninitialized reads.
Here is the report:
Error #1: UNINITIALIZED READ 136 byte(s)
Elapsed time = 0:00:00.734 in thread 5768
system call NtCreateThread
0x7c8106f5 KERNEL32.dll!CreateThread+0x1e
??:0
0x00401149 test.exe!MyThread::Start+0x29
z:\dr-sandbox\test.cc:15+0x19
0x0040108d test.exe!main+0x1d
z:\dr-sandbox\test.cc:43+0x0
0x00401510 test.exe!__tmainCRTStartup+0x15f
f:\dd\vctools\crt_bld\self_x86\crt\src\crt0.c:327+0x12
0x7c817077 KERNEL32.dll!RegisterWaitForInputIdle+0x49
??:0
Error #2: UNADDRESSABLE ACCESS 1 byte(s)
Elapsed time = 0:00:00.781 in thread 4368
0x7c91b02a ntdll.dll!RtlUnicodeStringToInteger+0x199
??:0
Error #3: UNADDRESSABLE ACCESS 1 byte(s)
Elapsed time = 0:00:00.781 in thread 4368
system call NtContinue
Error #4: UNINITIALIZED READ
Elapsed time = 0:00:00.797 in thread 4368
0x00401186 test.exe!MyThread::ThreadBody+0x6
z:\dr-sandbox\test.cc:25+0x3
0x7c80b729 KERNEL32.dll!GetModuleFileNameA+0x1ba
??:0
Error #5: UNINITIALIZED READ
Elapsed time = 0:00:00.797 in thread 4368
0x004011a3 test.exe!MyThread::ThreadBody+0x23
z:\dr-sandbox\test.cc:28+0x3
0x7c80b729 KERNEL32.dll!GetModuleFileNameA+0x1ba
??:0
Original issue: http://code.google.com/p/dynamorio/issues/detail?id=286
该提问来源于开源项目：DynamoRIO/dynamorio
