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Date:   Fri, 10 Aug 2018 17:55:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Paul Menzel <pmenzel+linux-scsi@...gen.mpg.de>
Cc:     stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Ming Lei <ming.lei@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        it+linux-scsi@...gen.mpg.de,
        Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
        linux-scsi@...r.kernel.org
Subject: Re: aacraid: Regression in 4.14.56 with *genirq/affinity: assign
 vectors to all possible CPUs*

On Fri, Aug 10, 2018 at 04:11:23PM +0200, Paul Menzel wrote:
> Dear Greg,
> 
> 
> On 08/10/18 15:36, Greg Kroah-Hartman wrote:
> > On Fri, Aug 10, 2018 at 03:21:52PM +0200, Paul Menzel wrote:
> >> Dear Greg,
> >>
> >>
> >> Commit ef86f3a7 (genirq/affinity: assign vectors to all possible CPUs) added
> >> for Linux 4.14.56 causes the aacraid module to not detect the attached devices
> >> anymore on a Dell PowerEdge R720 with two six core 24x E5-2630 @ 2.30GHz.
> >>
> >> ```
> >> $ dmesg | grep raid
> >> [    0.269768] raid6: sse2x1   gen()  7179 MB/s
> >> [    0.290069] raid6: sse2x1   xor()  5636 MB/s
> >> [    0.311068] raid6: sse2x2   gen()  9160 MB/s
> >> [    0.332076] raid6: sse2x2   xor()  6375 MB/s
> >> [    0.353075] raid6: sse2x4   gen() 11164 MB/s
> >> [    0.374064] raid6: sse2x4   xor()  7429 MB/s
> >> [    0.379001] raid6: using algorithm sse2x4 gen() 11164 MB/s
> >> [    0.386001] raid6: .... xor() 7429 MB/s, rmw enabled
> >> [    0.391008] raid6: using ssse3x2 recovery algorithm
> >> [    3.559682] megaraid cmm: 2.20.2.7 (Release Date: Sun Jul 16 00:01:03 EST 2006)
> >> [    3.570061] megaraid: 2.20.5.1 (Release Date: Thu Nov 16 15:32:35 EST 2006)
> >> [   10.725767] Adaptec aacraid driver 1.2.1[50834]-custom
> >> [   10.731724] aacraid 0000:04:00.0: can't disable ASPM; OS doesn't have ASPM control
> >> [   10.743295] aacraid: Comm Interface type3 enabled
> >> $ lspci -nn | grep Adaptec
> >> 04:00.0 Serial Attached SCSI controller [0107]: Adaptec Series 8 12G SAS/PCIe 3 [9005:028d] (rev 01)
> >> 42:00.0 Serial Attached SCSI controller [0107]: Adaptec Smart Storage PQI 12G SAS/PCIe 3 [9005:028f] (rev 01)
> >> ```
> >>
> >> But, it still works with a Dell PowerEdge R715 with two eight core AMD
> >> Opteron 6136, the card below.
> >>
> >> ```
> >> $ lspci -nn | grep Adaptec
> >> 22:00.0 Serial Attached SCSI controller [0107]: Adaptec Series 8 12G SAS/PCIe 3 [9005:028d] (rev 01)
> >> ```
> >>
> >> Reverting the commit fixes the issue.
> >>
> >> commit ef86f3a72adb8a7931f67335560740a7ad696d1d
> >> Author: Christoph Hellwig <hch@....de>
> >> Date:   Fri Jan 12 10:53:05 2018 +0800
> >>
> >>     genirq/affinity: assign vectors to all possible CPUs
> >>     
> >>     commit 84676c1f21e8ff54befe985f4f14dc1edc10046b upstream.
> >>     
> >>     Currently we assign managed interrupt vectors to all present CPUs.  This
> >>     works fine for systems were we only online/offline CPUs.  But in case of
> >>     systems that support physical CPU hotplug (or the virtualized version of
> >>     it) this means the additional CPUs covered for in the ACPI tables or on
> >>     the command line are not catered for.  To fix this we'd either need to
> >>     introduce new hotplug CPU states just for this case, or we can start
> >>     assining vectors to possible but not present CPUs.
> >>     
> >>     Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
> >>     Tested-by: Christian Borntraeger <borntraeger@...ibm.com>
> >>     Tested-by: Stefan Haberland <sth@...ux.vnet.ibm.com>
> >>     Fixes: 4b855ad37194 ("blk-mq: Create hctx for each present CPU")
> >>     Cc: linux-kernel@...r.kernel.org
> >>     Cc: Thomas Gleixner <tglx@...utronix.de>
> >>     Signed-off-by: Christoph Hellwig <hch@....de>
> >>     Signed-off-by: Jens Axboe <axboe@...nel.dk>
> >>     Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >>
> >> The problem doesn’t happen with Linux 4.17.11, so there are commits in
> >> Linux master fixing this. Unfortunately, my attempts to find out failed.
> >>
> >> I was able to cherry-pick the three commits below on top of 4.14.62,
> >> but the problem persists.
> >>
> >> 6aba81b5a2f5 genirq/affinity: Don't return with empty affinity masks on error
> >> 355d7ecdea35 scsi: hpsa: fix selection of reply queue
> >> e944e9615741 scsi: virtio_scsi: fix IO hang caused by automatic irq vector affinity
> >>
> >> Trying to cherry-pick the commits below, referencing the commit
> >> in question, gave conflicts.
> >>
> >> 1. adbe552349f2 scsi: megaraid_sas: fix selection of reply queue
> >> 2. d3056812e7df genirq/affinity: Spread irq vectors among present CPUs as far as possible
> >>
> >> To avoid further trial and error with the server with a slow firmware,
> >> do you know what commits should fix the issue?
> > 
> > Look at the email on the stable mailing list:
> > 	Subject: Re: Fix for 84676c1f (b5b6e8c8) missing in 4.14.y
> > it should help you out here.
> 
> Ah, I didn’t see that [1] yet. Also I can’t find the original message, and a
> way to reply to that thread. Therefore, here is my reply.
> 
> > Can you try the patches listed there?
> 
> I tried some of these already without success.
> 
> b5b6e8c8d3b4 scsi: virtio_scsi: fix IO hang caused by automatic irq vector affinity
> 2f31115e940c scsi: core: introduce force_blk_mq
> adbe552349f2 scsi: megaraid_sas: fix selection of reply queue
> 
> The commit above is already in v4.14.56.
> 
> 8b834bff1b73 scsi: hpsa: fix selection of reply queue
> 
> The problem persists.
> 
> The problem also persists with the state below.
> 
> 3528f73a4e5d scsi: core: introduce force_blk_mq
> 16dc4d8215f3 scsi: hpsa: fix selection of reply queue
> f0a7ab12232d scsi: virtio_scsi: fix IO hang caused by automatic irq vector affinity
> 6aba81b5a2f5 genirq/affinity: Don't return with empty affinity masks on error
> 1aa1166eface (tag: v4.14.62, stable/linux-4.14.y) Linux 4.14.62
> 
> So, some more commits are necessary.

Or I revert the original patch here, and the follow-on ones that were
added to "fix" this issue.  I think that might be the better thing
overall here, right?  Have you tried that?

thanks,

greg k-h

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