[Bug 195349] CAM status: Command timeout since upgrade to 10.1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195349

--- Comment #23 from Nerijus <nk at nk99.org> ---
(In reply to Nerijus from comment #22)
> Same happened in the middle of 9.3 upgrade to 10.1. Same error, different
> controller (see below), gmirror raid1.
> 
> ahci0 at pci0:0:18:0:      class=0x01018f card=0x73271462 chip=0x43801002
> rev=0x00 hdr=0x00
>     vendor     = 'Advanced Micro Devices [AMD] nee ATI'
>     device     = 'SB600 Non-Raid-5 SATA'
>     class      = mass storage
>     subclass   = ATA

After rereading more carefully this report, noticed there're more than one
error type. Mine is:

Dec 31 17:31:20 nitrogen kernel: ahcich2: Timeout on slot 25 port 0
Dec 31 17:31:20 nitrogen kernel: ahcich2: is 00000000 cs c1ffffff ss ffffffff
rs ffffffff tfd c0 serr 00000000 cmd 0004be17
Dec 31 17:31:20 nitrogen kernel: (ada1:ahcich2:0:0:0): WRITE_FPDMA_QUEUED. ACB:
61 40 e2 4e 15 40 02 00 00 00 00 00
Dec 31 17:31:20 nitrogen kernel: (ada1:ahcich2:0:0:0): CAM status: Command
timeout
Dec 31 17:31:20 nitrogen kernel: (ada1:ahcich2:0:0:0): Retrying command
Dec 31 17:31:20 nitrogen kernel: ahcich0: Timeout on slot 4 port 0
Dec 31 17:31:20 nitrogen kernel: ahcich0: is 00000000 cs fffffe0f ss ffffffff
rs ffffffff tfd c0 serr 00000000 cmd 0004a917
Dec 31 17:31:20 nitrogen kernel: (ada0:ahcich0:0:0:0): WRITE_FPDMA_QUEUED. ACB:
61 40 e2 4e 15 40 02 00 00 00 00 00
Dec 31 17:31:20 nitrogen kernel: (ada0:ahcich0:0:0:0): CAM status: Command
timeout
Dec 31 17:31:20 nitrogen kernel: (ada0:ahcich0:0:0:0): Retrying command

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