Re: SCSI regression in 4.11

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On Wed, 01 Mar 2017 15:09:44 -0800
James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> wrote:

> On Wed, 2017-03-01 at 13:27 -0800, Stephen Hemminger wrote:
> > Ok here is much better data, wasn't accounting for the offset in the
> > payload  
> 
> But now both responses are the same:
> 
> > Working 4.10  
> [...]
> > [    1.048920] hv_storvsc: INQUIRY cmd 0x12 0x0 0x0 scsi status 0x0
> > srb status 0x20 length 36
> > [    1.048920] hv_storvsc:  payload size 288 count 1 offset 1024 len
> > 36 pfn 0x1f15d7
> > [    1.048921] hv_storvsc:  sg 0: phys 0x1f15d7000 virt
> > ffff9270b15d7000 offset 0x400 length 36
> > [    1.048922] data: 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00
> > 00 00 00  ................
> > [    1.048923] data: 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00
> > 00 00 00  ................
> > [    1.048923] data: 00000020: 00 00 00 00                           
> >            ....
> > [    1.048942] scsi host1: scsi scan: INQUIRY result too short (5),
> > using 36
> > 
> > 
> > Broken 4.11  
> [...]
> > [    1.812926] hv_storvsc: INQUIRY cmd 0x12 0x0 0x0 scsi status 0x0
> > srb status 0x20 length 36
> > [    1.812927] hv_storvsc:  payload size 288 count 1 offset 2816 len
> > 36 pfn 0x1f198b
> > [    1.812928] hv_storvsc:  sg 0: phys 0x1f198b000 virt
> > ffff9a42f198b000 offset 0xb00 length 36
> > [    1.812953] data: 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00
> > 00 00 00  ................
> > [    1.812953] data: 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00
> > 00 00 00  ................
> > [    1.812954] data: 00000020: 00 00 00 00                           
> >            ....
> > [    1.813258] scsi host1: scsi scan: INQUIRY result too short (5),
> > using 36  
> 
> Hyper-v is returning a buffer of zeros for INQUIRY to the offline
> device in both cases ... that means the problem isn't where I thought
> it was.
> 
> James

Yes. Earlier output wasn't accounting for offsets, new dump code is.



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