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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 <ehabkost@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20170829212053.6003-1-ehabkost@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Eduardo Habkost 2017-08-29 18:20:53 -03:00 committed by Stefan Hajnoczi
parent d942feec97
commit e916a6e88a
1 changed files with 2 additions and 0 deletions
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2
util/oslib-posix.c
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@ -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();
}