disk/aio: Cancel AIO thread on cleanup
If the AIO thread is still calling io_getevents() while the exit path
calls io_destroy(), it will segfault. Wait for the thread to finish before
destroying the context.
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/disk/aio.c b/disk/aio.c
index 1fcf368..277ddf7 100644
--- a/disk/aio.c
+++ b/disk/aio.c
@@ -99,7 +99,6 @@
int disk_aio_setup(struct disk_image *disk)
{
int r;
- pthread_t thread;
/* No need to setup AIO if the disk ops won't make use of it */
if (!disk->ops->async)
@@ -110,7 +109,7 @@
return -errno;
io_setup(AIO_MAX, &disk->ctx);
- r = pthread_create(&thread, NULL, disk_aio_thread, disk);
+ r = pthread_create(&disk->thread, NULL, disk_aio_thread, disk);
if (r) {
r = -errno;
close(disk->evt);
@@ -126,6 +125,8 @@
if (!disk->async)
return;
+ pthread_cancel(disk->thread);
+ pthread_join(disk->thread, NULL);
close(disk->evt);
io_destroy(disk->ctx);
}
diff --git a/include/kvm/disk-image.h b/include/kvm/disk-image.h
index adc9fe4..2275e23 100644
--- a/include/kvm/disk-image.h
+++ b/include/kvm/disk-image.h
@@ -69,6 +69,7 @@
#ifdef CONFIG_HAS_AIO
io_context_t ctx;
int evt;
+ pthread_t thread;
#endif /* CONFIG_HAS_AIO */
const char *wwpn;
const char *tpgt;
