1 // Check that stores in signal handlers are not recorded in origin history.
2 // This is, in fact, undesired behavior caused by our chained origins
3 // implementation being not async-signal-safe.
4 
5 // RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O3 %s -o %t && \
6 // RUN:     not %run %t >%t.out 2>&1
7 // RUN: FileCheck %s < %t.out
8 
9 // RUN: %clangxx_msan -mllvm -msan-instrumentation-with-call-threshold=0 -fsanitize-memory-track-origins=2 -O3 %s -o %t && \
10 // RUN:     not %run %t >%t.out 2>&1
11 // RUN: FileCheck %s < %t.out
12 
13 // Reported deadly signal due to stack-overflow
14 // XFAIL: netbsd
15 
16 #include <signal.h>
17 #include <stdio.h>
18 #include <sys/types.h>
19 #include <unistd.h>
20 
21 volatile int x, y;
22 
23 void SignalHandler(int signo) {
24   y = x;
25 }
26 
27 int main(int argc, char *argv[]) {
28   int volatile z;
29   x = z;
30 
31   signal(SIGHUP, SignalHandler);
32   kill(getpid(), SIGHUP);
33   signal(SIGHUP, SIG_DFL);
34 
35   return y;
36 }
37 
38 // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
39 // CHECK-NOT: in SignalHandler
40