[Bug 221704] CAM status: Command timeout

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221704

            Bug ID: 221704
           Summary: CAM status: Command timeout
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: gnu
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: andrei at fazik.net.ua

Hello,
After updating to 11.1 my system can't boot with errors like 
(ada0:ata2:0:0:0): WRITE_DMA48. ACB: 35 00 50 29 10 40 6c  00 0c 00
(ada0:ata2:0:0:0): CAM status: Command timeout
(ada0:ata2:0:0:0): Retrying command
for all 6 sata hdd(mirror from 2 raidz)
Hardware: Supermicro X8DTN+-F / 6xWD1502FYPS-02W3B0 /2xE5649
HDDs connected to sata ports on baseboard.
If I add 
hint.ata.2.mode=PIO4
hint.ata.3.mode=PIO4
hint.ata.4.mode=PIO4
hint.ata.5.mode=PIO4
to device.hints I'm able to boot but performance of IO becomes really
disappointing.
If I roll back system to 11.0 all works fine again.
What was done so far:
1) Placed disks with same sata cables to another PC - boots fine
2)Tried separate raid controller on this baseboard - doesn't boots properly
4)Used separate power supply for disk - the same errors.
5)Used another power supply for whole system - no effect, same issue

Also, if I add to /etc/rc.d/zfs something like 
"find / -name something" after "zfs mount -a" it boots too(without modification
of device.hints), but after some time igb0(there is torrent traffic on it)will
hung and only reboot helps, maybe this is related or this is some separate bug.
I don't remember exact dmeseg message for hung of igb0, but will post update
when will face it again.

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