[Bug 1285197] Re: growpart failed in ppc64el guest

William Grant me at williamgrant.id.au
Sat Jun 20 00:25:42 UTC 2015


** Description changed:

  growpart uses sgdisk to resize gpt partition tables and then
  'partx --update' to inform the kernel of those changes.
  
  an example usage of sgdisk ends up looking like this:
-   # Modify the partition table. all in one go (order is important!):
-   #  - move the GPT backup header to the end of the disk
-   #  - delete the partition
-   #  - recreate the partition with the new size
-   #  - set the partition code
-   #  - set the partition GUID
-   #  - set the partition name
-   sgdisk --move-second-header --delete=1 --new=1:18432:20971486
-     --typecode=1:0FC63DAF-8483-4772-8E79-3D69D8477DE4
-     --partition-guid=1:53FFEF70-1623-46CC-AFB7-EBC1EB5340F2
-     '--change-name=1:Linux filesystem' /dev/sda
+   # Modify the partition table. all in one go (order is important!):
+   #  - move the GPT backup header to the end of the disk
+   #  - delete the partition
+   #  - recreate the partition with the new size
+   #  - set the partition code
+   #  - set the partition GUID
+   #  - set the partition name
+   sgdisk --move-second-header --delete=1 --new=1:18432:20971486
+     --typecode=1:0FC63DAF-8483-4772-8E79-3D69D8477DE4
+     --partition-guid=1:53FFEF70-1623-46CC-AFB7-EBC1EB5340F2
+     '--change-name=1:Linux filesystem' /dev/sda
  
  We're seeing an issue on ppc64el systems with gpt partition tables.
- This reproduces only occasionally.  
+ This reproduces only occasionally.
  
  Note, when growpart runs, the partition it is updating is mounted.
  It does this to accomodate space at the end (a grow virtual disk).
  
- 
- The failure we saw was this (we only have logs), and subsequent run of 
+ The failure we saw was this (we only have logs), and subsequent run of
  'growpart' finished fine:
  command: growpart /dev/sda 1
  exit code: 2
  stdout:
-   FAILED: disk=/dev/sda partition=1: failed to repartition
+   FAILED: disk=/dev/sda partition=1: failed to repartition
  stderr:
-   failed [sgdisk_mod:4] sgdisk --move-second-header --delete=1
-      --new=1:18432:20971486 --typecode=1:0FC63DAF-8483-4772-8E79-3D69D8477DE4
-      --partition-guid=1:53FFEF70-1623-46CC-AFB7-EBC1EB5340F2
-      --change-name=1:Linux filesystem /dev/sda
-   Could not create partition 1 from 40532396646334464 to 0
-   Could not change partition 1's type code to 0FC63DAF-8483-4772-8E79-3D69D8477DE4!
-   Unable to set partition 1's name to 'Linux filesystem'!
-   Error encountered; not saving changes.
-   ***** WARNING: Resize failed, attempting to revert ******
-   ***** Appears to have gone OK ****
+   failed [sgdisk_mod:4] sgdisk --move-second-header --delete=1
+      --new=1:18432:20971486 --typecode=1:0FC63DAF-8483-4772-8E79-3D69D8477DE4
+      --partition-guid=1:53FFEF70-1623-46CC-AFB7-EBC1EB5340F2
+      --change-name=1:Linux filesystem /dev/sda
+   Could not create partition 1 from 40532396646334464 to 0
+   Could not change partition 1's type code to 0FC63DAF-8483-4772-8E79-3D69D8477DE4!
+   Unable to set partition 1's name to 'Linux filesystem'!
+   Error encountered; not saving changes.
+   ***** WARNING: Resize failed, attempting to revert ******
+   ***** Appears to have gone OK ****
  
  Note there the odd '1 from 40532396646334464 to 0'.
+ 
+ [Test Case]
+ 
+ On a ppc64el system with a sacrificial GPT disk (because it will blow
+ away your /dev/sda1):
+ 
+   while sudo sgdisk --delete=1 --new=1:18432:37748702 /dev/sda; do :;
+ done
+ 
+ This will normally fail after less than 20 iterations, usually like
+ this:
+ 
+   Could not create partition 1 from 40532396646334464 to 0
+ 
+ [Regression Potential]
+ 
+ Very minimal. The patch just initialises an uninitialised variable,
+ which happens to usually (and on x86 apparently always) contain a benign
+ value.
+ 
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: cloud-guest-utils 0.27-0ubuntu7
  ProcVersionSignature: User Name 3.13.0-12.32-generic 3.13.4
  Uname: Linux 3.13.0-12-generic ppc64le
  ApportVersion: 2.13.2-0ubuntu5
  Architecture: ppc64el
  Date: Wed Feb 26 14:50:02 2014
  PackageArchitecture: all
  ProcEnviron:
-  TERM=xterm
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  SourcePackage: cloud-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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Title:
  growpart failed in ppc64el guest

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