linux 3.16.0-18.25 fails to boot on POWER8 VM with ibm-vscsi

[Adam Conrad]

When I try to boot 3.16.0-18.25 on a POWER8 VM, I get the following in a hard loop on the console:

[72319.154290] sd 0:0:0:0: Can't map DMA_BIDIRECTIONAL to read/write
[72319.154413] sd 0:0:0:0: couldn't convert cmd to srp_cmd

Reproducible with subsequent reboots, it's not a one-off issue. Rebooting into 3.16.0-17.23 works fine.

[Chris J Arges (arges)]

The bad commit is:
a118c6c1d907e52286df25ee1e8b217f25d6f73d

[Chris J Arges (arges)]

Posted patch to kernel team ML. This doesn't affect trusty.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.16.0-20.27

---------------
linux (3.16.0-20.27) utopic; urgency=low

  [ Tim Gardner ]

  * [Config] CONFIG_CXL=m
  * Release Tracking Bug
    - LP: #1376354

  [ Andi Kleen ]

  * SAUCE: perf tools: Fix perf record as non root with kptr_restrict == 1
    - LP: #1375441

  [ Chris J Arges ]

  * SAUCE: Revert "sd: don't use scsi_setup_blk_pc_cmnd for flush requests"
    - LP: #1375452

  [ Ian Munsie ]

  * SAUCE: (no-up) powerpc/cell: Move spu_handle_mm_fault() out of cell platform
  * SAUCE: (no-up) powerpc/cell: Move data segment faulting code out of cell platform
  * SAUCE: (no-up) powerpc/msi: Improve IRQ bitmap allocator
  * SAUCE: (no-up) powerpc/mm: Export mmu_kernel_ssize and mmu_linear_psize
  * SAUCE: (no-up) powerpc/powernv: Split out set MSI IRQ chip code
  * SAUCE: (no-up) cxl: Add new header for call backs and structs
  * SAUCE: (no-up) powerpc/powerpc: Add new PCIe functions for allocating cxl interrupts
  * SAUCE: (no-up) powerpc/mm: Add new hash_page_mm()
  * SAUCE: (no-up) powerpc/opal: Add PHB to cxl mode call
  * SAUCE: (no-up) powerpc/mm: Add hooks for cxl
  * SAUCE: (no-up) cxl: Add base builtin support
  * SAUCE: (no-up) cxl: Driver code for powernv PCIe based cards for userspace access
  * SAUCE: (no-up) cxl: Userspace header file.
  * SAUCE: (no-up) cxl: Add driver to Kbuild and Makefiles
  * SAUCE: (no-up) cxl: Add documentation for userspace APIs
 -- Tim Gardner <email address hidden> Tue, 30 Sep 2014 13:05:27 -0600