oslib-posix: Print errors before aborting on qemu_alloc_stack()

If QEMU is running on a system that's out of memory and mmap() fails, QEMU aborts with no error message at all, making it hard to debug the reason for the failure. Add perror() calls that will print error information before aborting. Signed-off-by: Eduardo Habkost <[email protected]> Reviewed-by: Philippe Mathieu-Daudé <[email protected]> Tested-by: Philippe Mathieu-Daudé <[email protected]> Message-id: [email protected] Signed-off-by: Stefan Hajnoczi <[email protected]>
dreddy · Aug 30, 2017 · e916a6e · e916a6e
1 parent d942fee
commit e916a6e
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
@@ -530,6 +530,7 @@ void *qemu_alloc_stack(size_t *sz)
     ptr = mmap(NULL, *sz, PROT_READ | PROT_WRITE,
                MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
     if (ptr == MAP_FAILED) {
+        perror("failed to allocate memory for stack");
         abort();
     }
 
@@ -544,6 +545,7 @@ void *qemu_alloc_stack(size_t *sz)
     guardpage = ptr;
 #endif
     if (mprotect(guardpage, pagesz, PROT_NONE) != 0) {
+        perror("failed to set up stack guard page");
         abort();
     }