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[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

I will not change the status of this bug because I can not reliably rule out that the initial issue still exists. That was reported to happen not all the times and from the stack trace involved some locking issue in the pci scsi adapter's driver.
Since comment #9, however, the reported stack trace is showing a completely different issue. This happened to be a regression since 3.13.0-46 and in order to cleanly separate the problems I opened LP: #1589910 to track the fix for that. As soon as that is there should be no need to enforce a HWE kernel for commissioning and/or provisioning of ppc64el hosts.

Should the initially reported problem persist then, please report back
here so we can try to fix that, too. Note that the stack trace should
involve the IPR adapter in some way. Like:

[   14.995435] ipr: IBM Power RAID SCSI Device Driver version: 2.6.0 (November 16, 2012)
[   14.995630] ipr 0001:04:00.0: Found IOA with IRQ: 0
[   14.995828] ipr 0001:04:00.0: Using 64-bit DMA iommu bypass
[   14.996992] pnv_pci_dump_phb_diag_data: Unrecognized ioType 33554432
[   14.997063] EEH: Frozen PE#5 detected on PHB#1
[   14.997124] CPU: 11 PID: 911 Comm: systemd-udevd Not tainted 3.13.0-27-generic #50-Ubuntu
[   14.997207] Call Trace:
[   14.997242] [c000000fe325af70] [c000000000016af0] .show_stack+0x170/0x290 (unreliable)
[   14.997340] [c000000fe325b060] [c000000000966fc0] .dump_stack+0x88/0xb4
[   14.997427] [c000000fe325b0e0] [c0000000000364b0] .eeh_dev_check_failure+0x430/0x480
[   14.997526] [c000000fe325b190] [c000000000036584] .eeh_check_failure+0x84/0xe0
[   14.997630] [c000000fe325b220] [d00000000ef233e0] .ipr_mask_and_clear_interrupts+0x190/0x1d0 [ipr]
[   14.997747] [c000000fe325b2d0] [d00000000ef2a394] .ipr_probe_ioa+0xc24/0x1370 [ipr]
[   14.997857] [c000000fe325b400] [d00000000ef325c4] .ipr_probe+0x44/0x4c0 [ipr]

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https://bugs.launchpad.net/bugs/1425699

Title:
  kernel panic on IBM Power8 PPC MAAS ephemeral image

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  Confirmed

Bug description:
  The kernel running on the 14.04 ephemeral image for MAAS when
  commissioning an IBM Power8 PPC server causes a periodic kernel panic.

  This happens intermittently and cannot be forcefully reproduced.

  The kernel version on the image is 3.13.0-27.50-generic according to
  the boot process.

  Attached is the boot process log with the kernel panics.

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