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971bea8089
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>
6 lines
89 B
Plaintext
6 lines
89 B
Plaintext
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Ran 1 tests
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OK
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