netdev - RE: order:1 failure in ipoib_cm_alloc_rx

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Date:	Fri, 22 Aug 2014 09:00:50 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Venkat Venkatsubra' <venkat.x.venkatsubra@...cle.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: order:1 failure in ipoib_cm_alloc_rx_skb

From: Venkat Venkatsubra
> Hello All,
> 
> Many of our customers have hit this order:1 failure in ipoib_cm_alloc_rx_skb causing softlockup:
> ....
>         skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
> ....

Notwithstanding any other problems, that allocation could fail even if the size were
small enough that the entire skb would fit in one page.
So the driver needs changing so that the allocation failure doesn't cause a deadlock.

OTOH if you can't allocate 8k of contiguous address space and memory the system
is unlikely to be working very well at all.

	David

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