On Tue, Mar 21, 2017 at 11:16:19AM +0800, Fam Zheng wrote: > Eject / change of scsi-cd on a virtio-scsi dataplane bus causes abort() > because > the new BDS doesn't get proper bdrv_set_aio_context(). > > Store the AioContext in BB and do it in blk_insert_bs. That is done by > Vladimir's patch. > > Other patches are to make sure such a bdrv_set_aio_context() doesn't interfere > with other BBs using other nodes from this graph. > > RFC note: > > Unfortunately, a use-after-free crash in iotests 030 appears since patch 7, > which I believe is a latent bug that bdrv_reopen is "reentered" in existing > code, rather than from this series: > > > #4 0x0000561ab90425a7 in bdrv_reopen > > #5 0x0000561ab8e1d28e in stream_complete > > #6 0x0000561ab9048543 in block_job_defer_to_main_loop_bh > > #7 0x0000561ab91305bc in aio_bh_call > > #8 0x0000561ab9130659 in aio_bh_poll > > #9 0x0000561ab9135656 in aio_poll > > #10 0x0000561ab90a6cf5 in bdrv_flush > > #11 0x0000561ab904285a in bdrv_reopen_prepare > > #12 0x0000561ab90423f0 in bdrv_reopen_multiple > > #13 0x0000561ab90425ef in bdrv_reopen > > #14 0x0000561ab909fa49 in commit_active_start > > #15 0x0000561ab8dd6ffb in qmp_block_commit > > #16 0x0000561ab8ded485 in qmp_marshal_block_commit > > #17 0x0000561ab9123e6c in do_qmp_dispatch > > #18 0x0000561ab9123fa4 in qmp_dispatch > > #19 0x0000561ab8ca26b7 in handle_qmp_command > > I have a fix that I'll post separately. > > The last patches are an alternative to patch 7, to "workaround" this in a > really non-obvious way.
Are there qemu-iotests that cover both success and failure scenarios for the new permission? Stefan
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