[Qemu-block] [PATCH 0/2] block: fix nbd-server-stop crash after blockdev-snapshot-sync

[Stefan Hajnoczi]

The blockdev-snapshot-sync command uses bdrv_append() to update all parents to
point at the external snapshot node.  This breaks BlockBackend's
blk_add/remove_aio_context_notifier(), which doesn't expect a BDS change.

Patch 1 fixes this by tracking AioContext notifiers in BlockBackend.

See the test case in Patch 2 for a reproducer.

Stefan Hajnoczi (2):
  block: let blk_add/remove_aio_context_notifier() tolerate BDS changes
  iotests: add 208 nbd-server + blockdev-snapshot-sync test case

 block/block-backend.c      | 63 ++++++++++++++++++++++++++++++++++++++++++++++
 block/trace-events         |  2 ++
 tests/qemu-iotests/208     | 55 ++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/208.out |  9 +++++++
 tests/qemu-iotests/group   |  1 +
 5 files changed, 130 insertions(+)
 create mode 100755 tests/qemu-iotests/208
 create mode 100644 tests/qemu-iotests/208.out

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2.14.3