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[Launchpad Bug Tracker <1582858@xxxxxxxxxxxxxxxxxx>]

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On a HP Proliant DL165 G7 I upgraded from 14.04.3 LTS to 16.04 LTS (I
know, not supported).

After reboot, the new kernel was loaded by GRUB, but failed to find the
disks installed in the system (setup working for almost 2 years,
standard HP setup with the SATA controller in AHCI mode and AHCI enabled
during BIOS). It then dropped to a shell in initramfs, after hundreds
(thousands?) of identical errors:

[...] AMD-Vi: Event Logged [IO_PAGE_FAULT] device=xxx adress=yyy
flags=0x...

and the final error messages:

ata3: softreset failed (1st FIS failed)
ata4: softreset failed (1st FIS failed)
ata3: limiting SATA link speed to 1.5 Gbps
ata3: softreset failed (1st FIS failed)
ata4: limiting SATA link speed to 1.5 Gbps
ata4: softreset failed (1st FIS failed)
ata3: reset failed, giving up
ata4: reset failed, giving up

The system disks are on ata1 and ata2, though.


I tried booting the system from different other 16.04 boot media (ubuntu-16.04-server-amd64.iso, ubuntu-16.04-desktop-amd64.iso) into a rescue system. I also got the 
[...] AMD-Vi: Event Logged ... messages. When the rescue shell was running, the system disks were also not detected, the installer I started as an experiment only offered the (USB disk) boot medium itself as installation target. The desktop installer and kernel then crashed with error messages about squashfs (sorry, didn't record those).

Without any change, the same system boots without issues from a 14.04
boot image, all disks present. Also, the 16.04 system boots fine if the
old 3.13.0-86 kernel is selected in the GRUB menu.

After some fiddling around, I turned off the IOMMU in the server's BIOS
(under PCiExpress) - and all went back to normal, without any change on
the installed system. Kernel 4.4.0-22-generic now boots just fine from
the LVM-Root.

So this is WORKSFORME now, but maybe somebody should look into it. I do
believe that Proliants are quite common out there. If needed, I'll
provide more info if possible - but currently I wouldn't know what.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
kernel 4.4.0-22-generic in 16.04 sees no disks on HP Proliant DL165 G7 if IOMMU is enabled
https://bugs.launchpad.net/bugs/1582858
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