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lazy-pages: treat ENOMEM returned by UFFDIO_UNREGISTER as task exit

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The UFFDIO_UNREGISTER returns ENOMEM only when it is unable to get
mm_struct. We can assume in such case that the task is exited.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Mike Rapoport 2017-10-08 09:26:53 +03:00 • committed by Andrei Vagin
parent f41e386d4d
commit 0ee7df54de
1 changed files with 9 additions and 0 deletions
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9
criu/uffd.c
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@ -914,6 +914,15 @@ static int handle_remove(struct lazy_pages_info *lpi, struct uffd_msg *msg)
*/
if (msg->event == UFFD_EVENT_REMOVE &&
ioctl(lpi->lpfd.fd, UFFDIO_UNREGISTER, &unreg)) {
/*
* The kernel returns -ENOMEM when unregister is
* called after the process has gone
*/
if (errno == ENOMEM) {
handle_exit(lpi);
return 0;
}
pr_perror("Failed to unregister (%llx - %llx)", unreg.start,
unreg.start + unreg.len);
return -1;