[Bug 1592990] s390-tools-zipl-fix-failed-start-subchannel-in-FBA-loader.patch

[bugproxy]

------- Comment on attachment From brueckner at de.ibm.com 2016-06-24 05:36 EDT-------


The FBA loader has only a limited amount of memory to build CCW requests.
Therefore larger I/O requests need to be split.
This splitting was off by one leading to the fact that one CCW request uses
memory of another data structure which in turn leads to corrupted data.
The resulting error message during IPL of a FBA device is:

Start subchannel failed
disabled wait PSW 00020000 80000000 00000000 00004502

The error might occur randomly depending on the size of the kernel image and
offsets within it.

Fix by correcting the split rule.

Signed-off-by: Stefan Haberland <sth at linux.vnet.ibm.com>

** Attachment added: "s390-tools-zipl-fix-failed-start-subchannel-in-FBA-loader.patch"
   https://bugs.launchpad.net/bugs/1592990/+attachment/4689642/+files/s390-tools-zipl-fix-failed-start-subchannel-in-FBA-loader.patch

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https://bugs.launchpad.net/bugs/1592990

Title:
  HCPGIR450W CP entered; disabled wait PSW 00020000 80000000 00000000
  00004502

Status in Ubuntu on IBM z Systems:
  In Progress
Status in debian-installer package in Ubuntu:
  In Progress
Status in s390-tools package in Ubuntu:
  In Progress
Status in debian-installer source package in Xenial:
  In Progress
Status in s390-tools source package in Xenial:
  In Progress

Bug description:
  zVM v6.3 zBC12 V7000 FICON SAN048B

  Installed Ubuntu on zBC12 with FICON attached (via SAN048B switches)
  using instructions at
  https://wiki.ubuntu.com/S390X/Installation%20In%20zVM.

  Installation build completed OK but IPL fails (after initial boot options appear and timeout to default) with following error message:
  HCPGIR450W CP entered; disabled wait PSW 00020000 80000000 00000000 00004502

  A trace was taken using:

  #CP TR SSCH RUN
  #CP IPL <ipldev>
  #cp tr end

  The resulting trace appears to fail at the same point in the trace on every IPL.
  Several builds have been attempted on different VMs with identical symptoms.

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