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SubjectRe: [PATCH] xen/blkfront: When purging persistent grants, keep them in the buffer
On 22/09/18 21:55, Boris Ostrovsky wrote:
> Commit a46b53672b2c ("xen/blkfront: cleanup stale persistent grants")
> added support for purging persistent grants when they are not in use. As
> part of the purge, the grants were removed from the grant buffer, This
> eventually causes the buffer to become empty, with BUG_ON triggered in
> get_free_grant(). This can be observed even on an idle system, within
> 20-30 minutes.
> We should keep the grants in the buffer when purging, and only free the
> grant ref.
> Fixes: a46b53672b2c ("xen/blkfront: cleanup stale persistent grants")
> Signed-off-by: Boris Ostrovsky <>

Reviewed-by: Juergen Gross <>


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