From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: commit backport request
Date: Mon, 16 Jul 2012 13:23:00 +1000
Message-ID: <20120716132300.11fad63c@notabene.brown>
References: <20120709140230.3cf926ec@notabene.brown>
	<20120711220740.GE10930@kroah.com>
	<20120712141422.05809022@notabene.brown>
	<CAGRgLy4tBOS1B8raJmxoge1CaWc-18=c_fMe6E_oCqa1ntSHzQ@mail.gmail.com>
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To: Alexander Lyakas <alex.bolshoy@gmail.com>
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On Fri, 13 Jul 2012 00:28:00 +0300 Alexander Lyakas <alex.bolshoy@gmail.com>
wrote:

> Hi,
> Is there any indication that can tell I am hitting this particular issue?
> I think I hit something similar to that once, IOs were hang within a
> raid5 and not returning. I issues w > sysrq-trigger and also have most
> of the procfs/<pid> info, so is there something I can look at to
> confirm?

IO stops, processes get blocked in get_active_stripe().  Increasing
stripe_cache_size allows a bit more IO through it eventually all fills up
again.

NeilBrown

>=20
>=20
>=20
> On Thu, Jul 12, 2012 at 7:14 AM, NeilBrown <neilb@suse.de> wrote:
> > On Wed, 11 Jul 2012 15:07:40 -0700 Greg KH <gregkh@linuxfoundation.org>=
 wrote:
> >
> >> On Mon, Jul 09, 2012 at 02:02:30PM +1000, NeilBrown wrote:
> >> >
> >> > Hi Mr Stable,
> >> >
> >> >  please apply patch
> >> >
> >> > commit fab363b5ff502d1b39ddcfec04271f5858d9f26e
> >> > Author: Shaohua Li <shli@kernel.org>
> >> > Date:   Tue Jul 3 15:57:19 2012 +1000
> >> >
> >> >     raid5: delayed stripe fix
> >> >
> >> >
> >> > to 3.4.y and 3.2.y.
> >> >
> >> > It fixes a deadlock in RAID5 which can cause all IO to hang.
> >> > It has been demonstrated to fix a real-life problem (the race is not
> >> > theoretical).
> >>
> >> Is it also needed for 3.0.x?  It seems to apply there just fine.
> >
> > Yes it is.  Don't know why I missed that.
> > I see you've already included it - thanks.
> >
> > NeilBrown


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