** Changed in: curtin (Ubuntu Xenial)
Status: New => Confirmed
** Changed in: curtin (Ubuntu Xenial)
Importance: Undecided => Medium
** Description changed:
+ ==== Begin SRU Template ========
+ [Impact]
+ During an update-grub in the target system when using multipath
+ the 'os-prober' tool used to discover other operating systems
+ to add to the grub menu does not handle duplicate paths and
+ mounts the same disk up twice causing unknown behavior which
+ sometimes results in timeouts during installation.
+
+ [Test Case]
+ This failure was transient, but the test cases that showed the
+ failure were
+ tests/vmtests/test_multipath.py
+
+ So to verify fix, best path is to just run vmtest successfully.
+
+ [Regression Potential]
+ Likeliest failure path would be for multipath installation to
+ not boot, or fail to install.
+
+ [Other Info]
+ ==== End SRU Template ========
+
+
+
1. % lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04
2. % apt-cache policy os-prober
os-prober:
- Installed: 1.70ubuntu3
- Candidate: 1.70ubuntu3
- Version table:
- *** 1.70ubuntu3 500
- 500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
- 100 /var/lib/dpkg/status
+ Installed: 1.70ubuntu3
+ Candidate: 1.70ubuntu3
+ Version table:
+ *** 1.70ubuntu3 500
+ 500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+ 100 /var/lib/dpkg/status
3. os-prober should skip over multipath partitions
4. os-prober only skips currently mounted partitions and ends up
mounting the same filesystem a second time with grub-mount; sometimes
this results in corrupt reads from /var/lib/os-
prober/<mount>/boot/grub/grub.cfg which results in undefined but broken
behavior
On multipath systems, you have two block devices pointing to the same
disk; when we create and mount a filesytem on one (/dev/sda1) we also
see the results on a second device (/dev/sdb1)
grub hooks to calling os-prober which checks /proc/mounts for mounted
partitions; it skips /dev/sda1, but when checking if /dev/sdb1 is
mounted, its not listed in /proc/mounts and then continues to call grub-
mount on /dev/sdb1; this uses grub-fuse to mount the disk a second time.
Even if multipath-tools and the module (dm-multipath) are not loaded, it
is possible to detect multipath by examining the FSUUID on the block
devices, blkid for example, will show that /dev/sda1 and /dev/sdb1 have
the same UUID.
-
- There is a patch for skipping multipath but requires multipathd and the
dm-multipath module to be loaded.
+ There is a patch for skipping multipath but requires multipathd and the
+ dm-multipath module to be loaded.
https://build-test.opensuse.org/package/view_file/home:coolo:test/os-
prober/os-prober-skip-part-on-multipath.patch?expand=1
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: os-prober 1.70ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
CurrentDesktop: GNOME-Flashback:GNOME
Date: Fri Jan 13 11:17:25 2017
Dependencies:
- gcc-6-base 6.0.1-0ubuntu1
- libc6 2.23-0ubuntu5
- libgcc1 1:6.0.1-0ubuntu1
+ gcc-6-base 6.0.1-0ubuntu1
+ libc6 2.23-0ubuntu5
+ libgcc1 1:6.0.1-0ubuntu1
InstallationDate: Installed on 2016-01-01 (378 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151209)
SourcePackage: os-prober
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/bugs/1656369
Title:
os-prober will double mount multipath partitions
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