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SubjectRe: 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@lst.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@de.ibm.com>
> >> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
> >> Tested-by: Stefan Haberland <sth@linux.vnet.ibm.com>
> >> Fixes: 4b855ad37194 ("blk-mq: Create hctx for each present CPU")
> >> Cc: linux-kernel@vger.kernel.org
> >> Cc: Thomas Gleixner <tglx@linutronix.de>
> >> Signed-off-by: Christoph Hellwig <hch@lst.de>
> >> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> >> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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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