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[Bug 1584052] Re: btrfs: file write crashes with false ENOSPC during snapshot creation since kernel 4.4 - fix available
** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed
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btrfs: file write crashes with false ENOSPC during snapshot creation
since kernel 4.4 - fix available
Status in linux package in Ubuntu:
Status in linux source package in Xenial:
Kernel 4.4 introduced a btrfs bug where a process writing a file while
a snapshot creation is underway will receive a false ENOSPC error (No
space left on device), even while there is plenty of free space on the
file system. On systems where snapshots are created frequently, this
leads to frequent database crashes (here with MySQL):
2016-05-19T21:00:01.862106Z 0 [Warning] InnoDB: Retry attempts for writing partial data failed.
2016-05-19T21:00:01.862133Z 0 [ERROR] InnoDB: Write to file ./ibdata1failed at offset 1048576, 16384 bytes should have been written, only 0 were written. Operating system error number 28. Check that your OS a
nd file system support files of this size. Check also that the disk is not full or a disk quota exceeded.
2016-05-19T21:00:01.862143Z 0 [ERROR] InnoDB: Error number 28 means 'No space left on device'
The problem is well known: http://www.spinics.net/lists/linux-btrfs/msg52672.html
A patch is available: https://patchwork.kernel.org/patch/7967161/
The patch has been committed to the Linux Kernel source tree on Feb 18, 2016: https://github.com/torvalds/linux/commits/master/fs/btrfs/file.c
Creating snapshots for undo and backup purposes without interrupting
database operations is a central aspect of btrfs usage. This bug
breaks server operations and should be fixed in the xenial kernel.
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