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Re: [Qemu-block] [Qemu-devel] [PATCH] block: Cleanup BMDS in bdrv_close_
From: |
Fam Zheng |
Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH] block: Cleanup BMDS in bdrv_close_all |
Date: |
Tue, 5 Sep 2017 16:54:41 +0800 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
On Tue, 09/05 10:44, Kevin Wolf wrote:
> Am 30.08.2017 um 12:06 hat Fam Zheng geschrieben:
> > This fixes the assertion due to op blockers added by BMDS:
> >
> > block.c:3248: bdrv_delete: Assertion `bdrv_op_blocker_is_empty(bs)' failed.
> >
> > Reproducer: simply start block migration and quit QEMU before it ends.
> >
> > Cc: address@hidden
> > Signed-off-by: Fam Zheng <address@hidden>
> > ---
> > block.c | 2 ++
> > migration/block.c | 2 +-
> > migration/block.h | 1 +
> > stubs/Makefile.objs | 1 +
> > stubs/block-migration.c | 6 ++++++
> > 5 files changed, 11 insertions(+), 1 deletion(-)
> > create mode 100644 stubs/block-migration.c
> >
> > diff --git a/block.c b/block.c
> > index 3308814bba..508a57274d 100644
> > --- a/block.c
> > +++ b/block.c
> > @@ -43,6 +43,7 @@
> > #include "qemu/cutils.h"
> > #include "qemu/id.h"
> > #include "qapi/util.h"
> > +#include "migration/block.h"
> >
> > #ifdef CONFIG_BSD
> > #include <sys/ioctl.h>
> > @@ -3111,6 +3112,7 @@ static void bdrv_close(BlockDriverState *bs)
> >
> > void bdrv_close_all(void)
> > {
> > + block_migration_cleanup_bmds();
> > block_job_cancel_sync_all();
> > nbd_export_close_all();
>
> This is before bdrv_drain_all(). Can't we still have a block migration
> request in flight, whose callback will then dereference a stale pointer?
You're right, bdrv_drain_all should be called first.
Fam