Re: [PATCH 3.17 00/25] 3.17.1-stable review

[Greg Kroah-Hartman]

On Wed, Nov 19, 2014 at 11:44:14AM -0800, Paul E. McKenney wrote:
> On Wed, Nov 19, 2014 at 09:22:35AM -0800, Greg Kroah-Hartman wrote:
> > On Mon, Oct 13, 2014 at 08:23:19AM -0500, Chuck Ebbert wrote:
> > > On Mon, 13 Oct 2014 08:28:35 -0300
> > > Henrique de Moraes Holschuh <hmh@xxxxxxxxxx> wrote:
> > > 
> > > > On Mon, 13 Oct 2014, Greg Kroah-Hartman wrote:
> > > > > This is the start of the stable review cycle for the 3.17.1
> > > > > release. There are 25 patches in this series, all will be posted
> > > > > as a response to this one.  If anyone has any issues with these
> > > > > being applied, please let me know.
> > > > 
> > > > Actually, 3.17 is a filesystem killer for some unlucky users due to
> > > > the libata blacklist being disabled by a bug.
> > > > 
> > > > Patch:
> > > > https://git.kernel.org/cgit/linux/kernel/git/tj/libata.git/patch/?id=1c40279960bcd7d52dbdf1d466b20d24b99176c8
> > > > 1c40279960bcd7d52dbdf1d466b20d24b99176c8 (libata: Un-break ATA
> > > > blacklist)
> > > > 
> > > 
> > > There are some more bugs too:
> > > 
> > > 
> > > RCU stalls, fix has been in rcu/urgent for 7 days:
> > > https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git/commit/?h=rcu/urgent&id=789cbbeca4eb7141cbd748ee93772471101b507b
> > 
> > Doesn't build in 3.17 properly :(
> > 
> > > blk-mq bio merging (still no good fix available):
> > > https://lkml.org/lkml/2014/10/9/729
> > > (The fix sitting in the block tree:
> > > https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git/commit/?h=for-3.18/core&id=764f612c6c3c231b9c12cfae7c328ccc9c453258
> > > is wrong according to that message.)
> > 
> > Did this ever get resolved?
> > 
> > > Stalls when using nohz, requires series of six patches to fix that
> > > didn't make 3.17 and weren't marked for -stable:
> > > 
> > > From a80e49e2cc3145af014a8ae44f575829cc236192 Mon Sep 17 00:00:00 2001
> > > From: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> > > Subject: nohz: Move nohz full init call to tick init
> > > 
> > > From c5c38ef3d70377dc504a6a3f611a3ec814bc757b Mon Sep 17 00:00:00 2001
> > > From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> > > Subject: irq_work: Introduce arch_irq_work_has_interrupt()
> > > 
> > > From 76a33061b9323b7fdb220ae5fa116c10833ec22e Mon Sep 17 00:00:00 2001
> > > From: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> > > Subject: irq_work: Force raised irq work to run on irq work interrupt
> > > 
> > > From 3010279f0fc36f0388872203e63ca49912f648fd Mon Sep 17 00:00:00 2001
> > > From: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> > > Subject: x86: Tell irq work about self IPI support
> > > 
> > > From 09f6edd424218eb69078551b2ecfada1f2d098eb Mon Sep 17 00:00:00 2001
> > > From: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> > > Subject: arm: Tell irq work about self IPI support
> > > 
> > > From 3631073659d0aafeaa52227bb61a100efaf901dc Mon Sep 17 00:00:00 2001
> > > From: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> > To: 09f6edd424218eb69078551b2ecfada1f2d098eb
> > To: Chuck Ebbert <cebbert.lkml@xxxxxxxxx>
> > Cc: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx>,
> > 	linux-kernel@xxxxxxxxxxxxxxx, stable@xxxxxxxxxx
> > Bcc: 
> > Subject: Re: [PATCH 3.17 00/25] 3.17.1-stable review
> > Reply-To: 
> > In-Reply-To: <20141013082319.175d90bb@as>
> > 
> > On Mon, Oct 13, 2014 at 08:23:19AM -0500, Chuck Ebbert wrote:
> > > On Mon, 13 Oct 2014 08:28:35 -0300
> > > Henrique de Moraes Holschuh <hmh@xxxxxxxxxx> wrote:
> > > 
> > > > On Mon, 13 Oct 2014, Greg Kroah-Hartman wrote:
> > > > > This is the start of the stable review cycle for the 3.17.1
> > > > > release. There are 25 patches in this series, all will be posted
> > > > > as a response to this one.  If anyone has any issues with these
> > > > > being applied, please let me know.
> > > > 
> > > > Actually, 3.17 is a filesystem killer for some unlucky users due to
> > > > the libata blacklist being disabled by a bug.
> > > > 
> > > > Patch:
> > > > https://git.kernel.org/cgit/linux/kernel/git/tj/libata.git/patch/?id=1c40279960bcd7d52dbdf1d466b20d24b99176c8
> > > > 1c40279960bcd7d52dbdf1d466b20d24b99176c8 (libata: Un-break ATA
> > > > blacklist)
> > > > 
> > > 
> > > There are some more bugs too:
> > > 
> > > 
> > > RCU stalls, fix has been in rcu/urgent for 7 days:
> > > https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git/commit/?h=rcu/urgent&id=789cbbeca4eb7141cbd748ee93772471101b507b
> > 
> > Doesn't build in 3.17 properly :(
> 
> Older kernels can use rcu_note_context_switch() instead of
> rcu_note_voluntary_context_switch(), which didn't show up until quite
> recently.  Please note that rcu_note_context_switch() is quite a bit
> more heavy-weight than is rcu_note_voluntary_context_switch(), but it
> should be OK in this context.

"OK" as in "worth the overhead to fix the known bug"?  Or is this just
not worth backporting to 3.17, 3.14, and 3.10 as no one really hits this
issue there?

thanks,

greg k-h
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