Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1447551
If one tries to issue a block_resize while a guest is busy
accessing the disk, it is possible that qemu may deadlock
when invoking aio_poll from both the main loop and the iothread.
Replace another instance of bdrv_drain_all that doesn't
quite belong.
Suggested-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: John Snow <js...@redhat.com>
---
blockdev.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index 0b38c3d..9ff06f3 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2923,10 +2923,9 @@ void qmp_block_resize(bool has_device, const char
*device,
goto out;
}
- /* complete all in-flight operations before resizing the device */
- bdrv_drain_all();
-
+ bdrv_drained_begin(bs);
ret = blk_truncate(blk, size, errp);
+ bdrv_drained_end(bs);
out:
blk_unref(blk);
--
2.9.3
