[Bug 272542] AHCI timeout

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272542

            Bug ID: 272542
           Summary: AHCI timeout
           Product: Base System
           Version: 13.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: julien@perdition.city

Hello,

I have a Supermicro A2SDi-2C-HLN4F with:

ahci0@pci0:0:19:0:      class=0x010601 rev=0x11 hdr=0x00 vendor=0x8086
device=0x19b2 subvendor=0x15d9 subdevice=0x0969
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor C3000 Series SATA Controller 0'
    class      = mass storage
    subclass   = SATA

and 4xTOSHIBA HDWG480 (N300) in a raidz2 and randomly I got tons of:

Dec  2 11:52:24 srv kernel: ahcich3: Timeout on slot 28 port 0
Dec  2 11:52:24 srv kernel: ahcich3: is 00000000 cs 10000000 ss 00000000 rs
10000000 tfd c0 serr 00000000 cmd 0004dc17
Dec  2 11:52:24 srv kernel: (ada3:ahcich3:0:0:0): FLUSHCACHE48. ACB: ea 00 00
00 00 40 00 00 00 00 00 00
Dec  2 11:52:24 srv kernel: (ada3:ahcich3:0:0:0): CAM status: Command timeout
Dec  2 11:52:24 srv kernel: (ada3:ahcich3:0:0:0): Retrying command, 0 more
tries remain

I added hint.ahci.0.msi="0" to /boot/device.hints and since then problem no
longer occurred.

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