Re: MD request counter broken on 4.0-rc5 RAID1

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On Tue, 24 Mar 2015 17:04:03 -0700 Simon Kirby <sim@xxxxxxxxxx> wrote:

> Hello :)
> 
> I'm seeing "iostat -x -k 1" print this after a RAID1 rebuild on 4.0-rc5.
> It's not abnormal other than it's 3-disk, with one being SSD (sdc) and
> the other two being write-mostly:
> 
> Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
> sda               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdb               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdc               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
> md0               0.00     0.00    0.00    0.00     0.00     0.00     0.00   345.00    0.00    0.00    0.00   0.00 100.00
> md2               0.00     0.00    0.00    0.00     0.00     0.00     0.00 58779.00    0.00    0.00    0.00   0.00 100.00
> md1               0.00     0.00    0.00    0.00     0.00     0.00     0.00    12.00    0.00    0.00    0.00   0.00 100.00
> 
> This was working on 3.18. Shall I bisect, or is it obvious?

Almost certainly 18c0b223cf9901727ef3b02da6711ac930b4e5d4 in 3.19.

It adds 'part_inc_in_flight' and never decrements it.

Complain to the author.

Thanks,
NeilBrown

> 
> It seems to just be leaking as the counters were going up gradually while
> it was rebuilding.
> 
> Personalities : [linear] [raid0] [raid1] [raid10]
> md1 : active raid1 sdb2[1](W) sda2[0](W) sdc2[2]
>       530048 blocks [3/3] [UUU]
> 
> md2 : active raid1 sdb3[0](W) sdc3[2] sda3[1](W)
>       153613440 blocks [3/3] [UUU]
> 
> md0 : active raid1 sdb1[0](W) sdc1[2] sda1[1](W)
>       2104384 blocks [3/3] [UUU]
> 
> unused devices: <none>
> 
> Simo-
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