mdadm exists with segmentation fault on array assembly

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Environment

SUSE Linux Enterprise Server 11 Service Pack 4 (SLES 11 SP4)
SUSE Linux Enterprise Server 12 Service Pack 2 (SLES 12 SP2)
SUSE Linux Enterprise Server 12 Service Pack 3 (SLES 12 SP3)

Situation

When assembling a softRAID using mdadm, a core dump is experienced:


# mdadm -A -c /lfs/xen/config/ltdbmri0011vm/mdadm.conf /dev/md/ltdbmri0011vm
Segmentation fault (core dumped)

This issue may be observed in different environments (XEN based VMs, physical server).

Resolution

A Program Temporary Fix for SLES 11 SP4 has been made available. Please contact SUSE Technical Service for a copy until the regular maintenance update is available.

SLES 12 SP2 is entered Long Term Service Support (LTSS) on 2018-March-31, the fix will be made available via the LTSS update channels.

For SLES 12 SP3 please update to mdadm-4.0-6.16.1 or later to address this issue.

Cause

A negative return code in the variable for the best devices handling.

Additional Information

(gdb) bt
#0  0x000000000041a9e3 in Assemble (st=0x6be780, mddev=0x7ffdadc3a822 "/dev/md1001", ident=0x698690, devlist=0x6ded00, c=0x7ffdadc38b60) at Assemble.c:1679
#1  0x0000000000405739 in main (argc=<optimized out>, argv=0x7ffdadc390e8) at mdadm.c:1404

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