Array information is not recognised in multipath after adding new LUNs.

Issue

• System taking long time to boot
• Array information is not recognized in multipath after adding new LUNs.

    mpathlb (eui.14xxyy30123456789a123456789a19760) dm-324 ##,##
    size=50G features='0' hwhandler='0' wp=rw
    `-+- policy='service-time 0' prio=0 status=active
      |- #:#:#:#        nvme2n314 259:610 active faulty running
      `- #:#:#:#        nvme1n314 259:658 active faulty running
    mpathdz (eui.14260123456789a123456789a19760) dm-140 ##,##
    size=50G features='0' hwhandler='0' wp=rw
    `-+- policy='service-time 0' prio=0 status=active
      |- #:#:#:#        nvme2n121 259:236 active faulty running
      `- #:#:#:#        nvme1n121 259:261 active faulty running
    mpathak (eui.142650123456789a123456789a0019760) dm-47 ##,##
    size=50G features='0' hwhandler='0' wp=rw
    `-+- policy='service-time 0' prio=0 status=active
      |- #:#:#:#        nvme2n64 259:129 active faulty running
      `- #:#:#:#        nvme1n64 259:144 active faulty running
    mpathr (eui.1426501xyza6789a123456789a019760) dm-20 NVME,EMC PowerMax_8000
    size=100G features='0' hwhandler='0' wp=rw
    `-+- policy='service-time 0' prio=50 status=active
      |- 2:2177:19:8531 nvme2n19 259:25 active ready running
      `- 1:3268:19:8531 nvme1n19 259:47 active ready running

• udevd fails to iterate over all the attached devices and following logs could be seen

Aug  3 02:45:36 hostname systemd-udevd[2083]: seq 10137 '/devices/virtual/nvme-fabrics/ctl/nvme1/nvme1n217' is taking a long time
Aug  3 02:45:36 hostname systemd-udevd[2083]: seq 10141 '/devices/virtual/nvme-fabrics/ctl/nvme1/nvme1n218' is taking a long time
Aug  3 02:45:36 hostname systemd-udevd[2083]: seq 10146 '/devices/virtual/nvme-fabrics/ctl/nvme0/nvme0n249' is taking a long time
Aug  3 02:45:36 hostname systemd-udevd[2083]: seq 10148 '/devices/virtual/nvme-fabrics/ctl/nvme1/nvme1n219' is taking a long time
Aug  3 02:45:36 hostname systemd-udevd[2083]: seq 10143 '/devices/virtual/nvme-fabrics/ctl/nvme0/nvme0n248' is taking a long time
Aug  3 02:45:36 hostname systemd-udevd[2083]: seq 10149 '/devices/virtual/nvme-fabrics/ctl/nvme0/nvme0n250' is taking a long time
Aug  3 02:45:36 hostname systemd-udevd[2083]: seq 10139 '/devices/virtual/nvme-fabrics/ctl/nvme0/nvme0n247' is taking a long time


Jun 10 15:05:07 hostname systemd-udevd[793]: seq 19855 '/devices/pci0000:c0/0000:c0:03.1/0000:c2:00.0/host0/port-0:0/expander-0:0/port-0:0:1/expander-0:1/port-0:1:2/end_device-0:1:2/target0:0:3/0:0:3:0/block/sdc' is taking a long time
Jun 10 15:05:07 hostname systemd-udevd[793]: seq 19853 '/devices/pci0000:c0/0000:c0:03.1/0000:c2:00.0/host0/port-0:0/expander-0:0/port-0:0:1/expander-0:1/port-0:1:9/end_device-0:1:9/target0:0:10/0:0:10:0/block/sdj' is taking a long time

We may encounter udevd symlinks failure notification

Jun 10 15:06:05 hostname systemd-udevd[932]: Failed to update device symlinks: Too many levels of symbolic links
Jun 10 15:06:06 hostname systemd-udevd[1010]: Failed to update device symlinks: Too many levels of symbolic links
Jun 10 15:06:06 hostname systemd-udevd[925]: Failed to update device symlinks: Too many levels of symbolic links

This may result in multipathd failure messages such as

Jun 10 15:10:07 hostname multipathd[3120]: sdej: failed to get udev uid: Invalid argument
Jun 10 15:10:07 hostname multipathd[3120]: sdej: failed to get unknown uid: Invalid argument
Jun 10 15:10:07 hostname multipathd[3120]: sdej: failed to get path uid
Jun 10 15:10:07 hostname multipathd[3120]: sdee: failed to get udev uid: 

• udevadm info does not report complete information for all the devices

P: /devices/virtual/nvme-subsystem/nvme-subsys0/nvme0n1
N: nvme0n1
S: disk/by-id/nvme-EMC_PowerMax_8000_00000197601426
S: disk/by-id/nvme-eui.142xxx303230303000yyyy6000019760
E: DEVLINKS=/dev/disk/by-id/nvme-EMC_PowerMax_8000_00000197601426 /dev/disk/by-id/nvme-eui.142xxx303230303000yyyy6000019760
E: DEVNAME=/dev/nvme0n1
E: DEVPATH=/devices/virtual/nvme-subsystem/nvme-subsys0/nvme0n1
E: DEVTYPE=disk
E: DM_MULTIPATH_DEVICE_PATH=0
E: ID_MODEL=EMC PowerMax_8000
E: ID_SERIAL=EMC PowerMax_8000_00000197601426
E: ID_SERIAL_SHORT=00000197601426
E: ID_WWN=eui.142xxx303230303000yyyy6000019760
E: ID_WWN_WITH_EXTENSION=eui.142xxx303230303000yyyy6000019760
E: MAJOR=259
E: MINOR=1
E: MPATH_SBIN_PATH=/sbin
E: SUBSYSTEM=block
E: TAGS=:systemd:
E: USEC_INITIALIZED=61301362

------------------- 

P: /devices/virtual/nvme-subsystem/nvme-subsys0/nvme0n433
N: nvme0n433
E: DEVNAME=/dev/nvme0n433
E: DEVPATH=/devices/virtual/nvme-subsystem/nvme-subsys0/nvme0n433
E: DEVTYPE=disk
E: MAJOR=259
E: MINOR=1002
E: SUBSYSTEM=block