Filesystem goes read-only while creating backups on HyperV
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| linux (Ubuntu) |
Fix Committed
|
Undecided
|
Unassigned | ||
Bug Description
Because "ubuntu-bug linux" not works because I am on kernel 3.19.0-17, I create this report manually.
Summary of problem: we create backups with HyperV of 4 linux virtual machines. There is 1 CentOS machine (XFS) and 3 Ubuntu 14.04 machines (EXT4). Problems occur on the Ubuntu machine only and have occurred on multiple hypervisors (physical machines). During the start or at the end of the creation of a snapshot, the filesystem switches to read-only mode. This happens at completely random moments: at least we are not able to detect a pattern. What we find weird is that the CentOS machine with XFS is not having any problems.
What actions did we undertake to get rid of problem? We tried multiple backup strategies with HyperV, including snapshots and exports. When this was not successful, we were adviced by the #ubuntu-kernel chat channel to upgrade our kernel to 3.19.0-17 (coming from 3.13.0-52). The reasons that this could solve the problem is that hyperv backups require freeze and thaw methods (https:/
The message we get from dmesg when the filesystem goes read-only is as follows on the 3.19.0-17 kernel:
[85630.239889] blk_update_request: I/O error, dev sda, sector 201697672
[85630.239931] Aborting journal on device sda1-8.
[85630.253386] EXT4-fs error (device sda1): ext4_journal_
[85630.253428] EXT4-fs (sda1): Remounting filesystem read-only
While it was as follows on the 3.13.0-52 kernel (different machine):
[66392.076569] end_request: I/O error, dev sda, sector 65127256
[66392.076610] Aborting journal on device sda5-8.
[66392.280052] EXT4-fs error (device sda5): ext4_journal_
[66392.280090] EXT4-fs (sda5): Remounting filesystem read-only
[66392.482903] EXT4-fs error (device sda5): ext4_journal_
System details:
- Version signature: Ubuntu 3.19.0-
- lspci.log: http://
- boot.log: http://
| description: | updated |
| summary: |
- Filesystem goes read-only while creating VSS snapshot on HyperV + Filesystem goes read-only while creating backups on HyperV |
| description: | updated |
| Brad Figg (brad-figg) wrote Missing required logs. | #1 |
| Changed in linux (Ubuntu): | |
| status: | New → Incomplete |
| Frederik Bosch (f-bosch) wrote | #2 |
| Changed in linux (Ubuntu): | |
| status: | Incomplete → Confirmed |
| status: | Confirmed → Fix Committed |
| Joshua R. Poulson (jrp) wrote | #3 |
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1456985
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.