diff options
| author | Hanna Reitz | 2022-02-16 11:53:55 +0100 |
|---|---|---|
| committer | Kevin Wolf | 2022-03-04 18:18:26 +0100 |
| commit | 971bea8089531af56b1bbd9ce62e756bdf006711 (patch) | |
| tree | a877a1ed3171fd079bc24e0a7a937c6b4dd84eda /po | |
| parent | iotests: Allow using QMP with the QSD (diff) | |
| download | qemu-971bea8089531af56b1bbd9ce62e756bdf006711.tar.gz qemu-971bea8089531af56b1bbd9ce62e756bdf006711.tar.xz qemu-971bea8089531af56b1bbd9ce62e756bdf006711.zip | |
iotests/graph-changes-while-io: New test
Test the following scenario:
1. Some block node (null-co) attached to a user (here: NBD server) that
performs I/O and keeps the node in an I/O thread
2. Repeatedly run blockdev-add/blockdev-del to add/remove an overlay
to/from that node
Each blockdev-add triggers bdrv_refresh_limits(), and because
blockdev-add runs in the main thread, it does not stop the I/O requests.
I/O can thus happen while the limits are refreshed, and when such a
request sees a temporarily invalid block limit (e.g. alignment is 0),
this may easily crash qemu (or the storage daemon in this case).
The block layer needs to ensure that I/O requests to a node are paused
while that node's BlockLimits are refreshed.
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20220216105355.30729-4-hreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'po')
0 files changed, 0 insertions, 0 deletions