4 Fixed Issues

This chapter describes issues that are fixed in Oracle Linux 7 Update 4.

Note that additional issues specific to the kernel that you are using might also be resolved. If you are using the default UEK R4u4, please see Unbreakable Enterprise Kernel: Release Notes for Unbreakable Enterprise Kernel Release 4 Update 4 (4.1.12-94). If you are using an alternate UEK release or update, please refer to the appropriate release notes for this kernel version, available at Unbreakable Enterprise Kernel documentation.

File Systems Issues Fixed

The following file systems issues are fixed in this release:

btrfs: UEK R3 incompatibility issue fixed

An incompatibility issue related to btrfs updates and UEK R3, where a btrfs formatted /root partition failed to boot, has been fixed. (Bug ID 24840489)

btrfs: Empty symbolic link after fsync of parent directory issue fixed

The issue that occurs after an fsync of a symbolic link's parent directory, followed by an attempt to mount the file system after a system crash or outage, which results in an empty symbolic link, has been fixed. (Bug ID 23748445)

xfs: Kernel panic in multi-block buffer logging code issue fixed

The XFS bug in the multi-block buffer logging code that caused a kernel panic at log push time due to invalid regions being set in the buffer log format bitmap has been fixed. (Bug ID 24400444)

btrfs: Kernel warning after snapshot is created with incorrect qgroup fixed

The bug that caused the file system to crash and a kernel warning when a snapshot was created with an incorrect ggroup has been fixed. (Bug ID 24716895)

Co-Existing IPv4 and IPv6 VxLAN issue for UEK R4u2 fixed

The issue, where VxLANs that are configured for both IPv4 and IPv6 cannot exist on the same host because of an inability to bind the VxLAN tunnel on the same port, and due to the way in which IPv6 sockets lists for IPv4 traffic has been fixed. This fix is made available in UEK R4u4, which is the default in UEK release in Oracle Linux 7 Update 4. (Bug ID 24579830)

kmod fixes for module compatibility checking

An issue in the upstream kmod package that was causing the kmod weak-modules script to incorrectly validate whether a module is compatible with the Kernel Application Binary Interface (kABI) is fixed in this release of Oracle Linux. Changes include performing the check at the same time when the --dry-run option is used and improvements to handling of printing of non-compatibility messages. This issue caused problems for users attempting to install or load ACFS drivers on RedHat Linux 7.4 systems. (Bug ID 26320387)