Messages in this thread |  | | Date | Thu, 28 Feb 2019 10:37:13 -0800 (PST) | Subject | Re: [PATCH v2] xen-netback: fix occasional leak of grant ref mappings under memory pressure | From | David Miller <> |
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From: Igor Druzhinin <igor.druzhinin@citrix.com> Date: Thu, 28 Feb 2019 12:48:03 +0000
> Zero-copy callback flag is not yet set on frag list skb at the moment > xenvif_handle_frag_list() returns -ENOMEM. This eventually results in > leaking grant ref mappings since xenvif_zerocopy_callback() is never > called for these fragments. Those eventually build up and cause Xen > to kill Dom0 as the slots get reused for new mappings: > > "d0v0 Attempt to implicitly unmap a granted PTE c010000329fce005" > > That behavior is observed under certain workloads where sudden spikes > of page cache writes coexist with active atomic skb allocations from > network traffic. Additionally, rework the logic to deal with frag_list > deallocation in a single place. > > Signed-off-by: Paul Durrant <paul.durrant@citrix.com> > Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Applied and queued up for -stable, thanks.
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