Issued:

2011-08-08

Updated:

2011-08-08

RHBA-2011:1126 - mdadm bug fix update

Synopsis

mdadm bug fix update

Type/Severity

Bug Fix Advisory

Topic

An updated mdadm package that fixes several bugs is now available for Red Hat Enterprise Linux 6.

Description

The mdadm package contains a utility for creating, managing, and monitoring Linux MD (multiple disk) devices.

This update fixes the following bugs:

• When an array was changing level from redundant to non-redundant such as RAID 0, mdadm failed to exit and remained in memory. This caused a variety of issues, including a termination with a segmentation fault when two array transitions were executed sequentially. With this update, a patch has been provided to address this issue, and the monitor is now properly removed from memory after the backward takeover operation. (BZ#723135)

• If an array size was not properly aligned to the chunk size, the expansion process failed to start and the "New chunk size does not divide component size" error message was returned. This bug has been fixed, and the array alignment is now checked before the expansion process begins. (BZ#723137)

• Previously, when a volume was created with the "--size" option but without providing a chunk size and a container, mdadm used the "UnSet=65534" option for rounding the volume size before setting the default chunk size. This caused the new volume to be created with an incorrect size. This bug has been fixed, and the volume size is now properly rounded to the chunk size. (BZ#723139)

• When the expansion process of a RAID 0 volume was restarted, mdadm failed to correctly assemble the array because the critical section could not be restored from a backup file, and the "mdadm: Failed to restore critical section for reshape - sorry" error message was returned. A patch has been provided to address this issue, and now, the RAID 0 expansion process cannot be restarted, thus fixing this bug. (BZ#723140)

• Previously, mdadm incorrectly calculated reshape start data disks number (0) during the reshape restart operation and used it for calculations. This caused a variety of issues; for example, when two disks were added to the 3-disk RAID 5 array and the array under migration was disassembled and then assembled again, mdadm terminated unexpectedly. A set of patches has been provided to address this issue, and the reshape process is now properly restarted in the described scenario. (BZ#723141)

• When two arrays were configured in a container and the arrays were reassembled during a rebuild or initialization process, the stored checkpoint for one of the arrays was sometimes lost. Consequently, the restarted process did not use the checkpoint information and started from zero position instead. A patch has been provided to address this issue, and the restarted process now properly continues from the stored checkpoint. (BZ#723142)

Users of mdadm are advised to upgrade to this updated package, which fixes these bugs.

Solution

Before applying this update, make sure all previously-released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at This content is not included.https://access.redhat.com/kb/docs/DOC-11259

Affected Products

Updated Packages

• mdadm-3.2.2-1.el6_1.2.src.rpm
• mdadm-debuginfo-3.2.2-1.el6_1.2.x86_64.rpm
• mdadm-3.2.2-1.el6_1.2.i686.rpm
• mdadm-3.2.2-1.el6_1.2.ppc64.rpm
• mdadm-debuginfo-3.2.2-1.el6_1.2.ppc64.rpm
• mdadm-3.2.2-1.el6_1.2.x86_64.rpm
• mdadm-debuginfo-3.2.2-1.el6_1.2.s390x.rpm
• mdadm-debuginfo-3.2.2-1.el6_1.2.i686.rpm
• mdadm-3.2.2-1.el6_1.2.s390x.rpm

Fixes

(none)

CVEs

(none)

References

(none)

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.