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Description of problem: After executing 'mdadm --stop /dev/md(x), md device still exists in /sys/block and /dev. Issue does not exist in latest RHEL7 levels. Version-Release number of selected component (if applicable): kernel-2.6.32-642.el6.x86_64 mdadm-3.3.4-1.el6_8.5.x86_64 How reproducible: every time Steps to Reproduce: [root@localhost ~]# cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdd1[0] sdd2[1] 499648 blocks super 1.2 [2/2] [UU] unused devices: <none> [root@localhost ~]# mdadm --stop /dev/md0 mdadm: stopped /dev/md0 [root@localhost ~]# cat /proc/mdstat Personalities : [raid1] unused devices: <none> [root@localhost ~]# ls /dev/md* /dev/md0 /dev/md: md-device-map [root@localhost ~]# ls /sys/block/md* alignment_offset bdi capability dev discard_alignment ext_range holders inflight md power queue range removable ro size slaves stat subsystem trace uevent [root@localhost ~]# ls -d /sys/block/md* /sys/block/md0 Actual results: After --stop executes successfully, device nodes remain Expected results: should remove devices at --stop completion Additional info: Manage_stop was identical between the versions I tested, so I am unsure if this issue is within mdadm or the kernel. I will start it in mdadm; if it needs moving please feel free.
Further info: [root@localhost ~]# lsof | grep md md/0 28 root cwd DIR 253,0 12288 2 / md/0 28 root rtd DIR 253,0 12288 2 / md/0 28 root txt unknown /proc/28/exe md_misc/0 29 root cwd DIR 253,0 12288 2 / md_misc/0 29 root rtd DIR 253,0 12288 2 / md_misc/0 29 root txt unknown /proc/29/exe ksmd 35 root cwd DIR 253,0 12288 2 / ksmd 35 root rtd DIR 253,0 12288 2 / ksmd 35 root txt unknown /proc/35/exe dmeventd 1071 root mem REG 253,0 1491968 148718 /lib64/liblvm2cmd.so.2.02 hald 1564 haldaemon 16r REG 0,3 0 4026531979 /proc/mdstat
XiaoNi, Jes, I did some further testing at your request. Below are the results. The script used for testing is as follows: http://pastebin.test.redhat.com/444130 A successful stop would be characterized as only showing the date in the block and not showing listings in /dev or /sys/block. - Standard RHEL 6.8 kernel and inbox mdadm [root@localhost ~]# uname -r 2.6.32-642.11.1.el6.x86_64 [root@localhost ~]# rpm -qa | grep mdadm mdadm-3.3.4-1.el6_8.5.x86_64 [root@localhost ~]# results: http://pastebin.test.redhat.com/444046 (Fail) ================================================ - Test kernel provided by XiaoNi and inbox mdadm: [root@localhost ~]# uname -r 2.6.32-680.el6.test.x86_64 [root@localhost ~]# rpm -qa | grep mdadm mdadm-3.3.4-1.el6_8.5.x86_64 http://pastebin.test.redhat.com/444058 (Fail) ================================================ - Standard RHEL 7.3 kernel and mdadm [root@localhost ~]# uname -r 3.10.0-514.2.2.el7.x86_64 [root@localhost ~]# rpm -qa | grep mdadm mdadm-3.4-14.el7.x86_64 http://pastebin.test.redhat.com/444076 (Pass) ================================================ - Test kernel provided by XiaoNi and patched mdadm: - mdadm patch taken from Jes in thread http://www.spinics.net/lists/raid/msg51490.html - patch applied: http://pastebin.test.redhat.com/444141 [root@localhost ~]# uname -r 2.6.32-680.el6.test.x86_64 [root@localhost ~]# rpm -qa | grep mdadm mdadm-3.3.4-1.el6_8.5.test.x86_64 http://pastebin.test.redhat.com/444142 (Pass)
Red Hat Enterprise Linux 6 transitioned to the Production 3 Phase on May 10, 2017. During the Production 3 Phase, Critical impact Security Advisories (RHSAs) and selected Urgent Priority Bug Fix Advisories (RHBAs) may be released as they become available. The official life cycle policy can be reviewed here: http://redhat.com/rhel/lifecycle This issue does not appear to meet the inclusion criteria for the Production Phase 3 and will be marked as CLOSED/WONTFIX. If this remains a critical requirement, please contact Red Hat Customer Support to request a re-evaluation of the issue, citing a clear business justification. Red Hat Customer Support can be contacted via the Red Hat Customer Portal at the following URL: https://access.redhat.com