On Mon, Aug 18, 2014 at 2:21 PM, Tejun Heo <t...@kernel.org> wrote:
> Hello,
>
> Sorry about the delay.  Cc'ing Dan.
>
> On Wed, Aug 06, 2014 at 02:02:47PM -0400, Nick Krause wrote:
>> On Wed, Jul 23, 2014 at 4:39 AM, Peter Zijlstra <pet...@infradead.org> wrote:
>> > On Tue, Jul 22, 2014 at 03:48:02PM -0400, Peter Hurley wrote:
>> >> [ +cc Tejun ]
>> >>
>> >> On 07/22/2014 03:26 PM, Jesse Brandeburg wrote:
>> >> > This is a repeatable panic, happens every boot (and prevents starting 
>> >> > my system)
>> >> >
>> >> > [    8.732993] sd 6:0:1:0: [sdb] Attached SCSI disk
>> >> > [    8.733857]  sda: sda1 sda2 sda3
>> >> > [    8.734318] sd 6:0:0:0: [sda] Attached SCSI disk
>> >> > [    8.737943] BUG: unable to handle kernel NULL pointer dereference at 
>> >> > 0000000000000058
>> >> > [    8.737947] IP: [<ffffffff814e0618>] ata_qc_new_init+0x188/0x1b0
>> >
>> > I too have this problem on one of my machines. Let me know if there's
>> > anything you need.
>
> Are you still seeing this on every boot?  ISTR this getting fixed but
> I could be confused.  Dan, the original thread is
>
>   
> http://lkml.kernel.org/g/CAEuXFEy5=0xkqpiwqnigbpi5ehszq5f_u7sj0t2bho_1lqe...@mail.gmail.com
>

This is the last I heard:

http://marc.info/?l=linux-ide&m=140630768020241&w=2

But I never saw a follow up.

Hmmm, commit 1a112d10f03e libata: introduce ata_host->n_tags to avoid
oops on SAS controllers

...doesn't fix this?  Jesse reported positive results here:

http://marc.info/?l=linux-ide&m=140624094731542&w=2
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