tsan: fix mmap_lots test

dvyukov · dvyukov · commit fb19400d4e4c · 2021-02-17T19:03:17.000+01:00
If tsan runtime will try to allocate something during exit handling, the allocation will fail because there is no VA whatsoever. It's observed to fail with the following error in some cases: failed to allocate 0x1000 (4096) bytes of DTLS_NextBlock. So terminate the process immediately. Reviewed-in: https://reviews.llvm.org/D96874
diff --git a/compiler-rt/test/tsan/mmap_lots.cpp b/compiler-rt/test/tsan/mmap_lots.cpp
@@ -24,6 +24,12 @@ int main() {
     fprintf(stderr, "allocated %zu with size %zu\n", allocated, mmap_size);
   }
   fprintf(stderr, "DONE\n");
+  // If tsan runtime will try to allocate something during exit handling,
+  // the allocation will fail because there is no VA whatsoever.
+  // It's observed to fail with the following error in some cases:
+  // failed to allocate 0x1000 (4096) bytes of DTLS_NextBlock.
+  // So terminate the process immediately.
+  _exit(0);
 }
 
 // CHECK: DONE

Original file line number	Diff line number	Diff line change
`@@ -24,6 +24,12 @@ int main() {`
`24`	`24`	`fprintf(stderr, "allocated %zu with size %zu\n", allocated, mmap_size);`
`25`	`25`	`}`
`26`	`26`	`fprintf(stderr, "DONE\n");`
	`27`	`+ // If tsan runtime will try to allocate something during exit handling,`
	`28`	`+ // the allocation will fail because there is no VA whatsoever.`
	`29`	`+ // It's observed to fail with the following error in some cases:`
	`30`	`+ // failed to allocate 0x1000 (4096) bytes of DTLS_NextBlock.`
	`31`	`+ // So terminate the process immediately.`
	`32`	`+ _exit(0);`
`27`	`33`	`}`
`28`	`34`
`29`	`35`	`// CHECK: DONE`