Issue

• systemd-udevd process is failing on multipath devices and shows below errors.
  During following timestamps the CPU utilization on systems was also reached up to 90-100%

  Aug 11 15:22:08 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-173' [7491]
  Aug 11 15:22:08 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-131' [7484]
  Aug 11 15:22:08 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-185' [7521]
  Aug 11 15:22:08 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-179' [7520]
  Aug 11 15:22:08 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-174' [7522]
  Aug 11 15:22:09 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-129' [7492]
  Aug 11 15:22:09 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-173' [7491]
  Aug 11 15:22:09 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-131' [7484]
  Aug 11 15:22:09 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-185' [7521]
  Aug 11 15:22:09 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-179' [7520]
  Aug 11 15:22:09 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-174' [7522]
  Aug 11 15:22:10 host1 systemd-udevd: timeout: killing '/sbin/kpartx -a /dev/dm-129' [7492]
  

• The ps aux output also shows lots of udev processes stuck in D (Uninterruptible) state

  $ ps aux|grep -i udev|grep D
  root      1178  0.0  0.0      0     0 ?        D    08:17   0:00 [systemd-udevd]
  root      1179  0.0  0.0  44928  3296 ?        D    08:17   0:01 /usr/lib/systemd/systemd-udevd
  root      1182  0.0  0.0      0     0 ?        D    08:17   0:00 [systemd-udevd]
  root      1183  0.0  0.0      0     0 ?        D    08:17   0:01 [systemd-udevd]
  root      1184  0.0  0.0  44788  3340 ?        D    08:17   0:01 /usr/lib/systemd/systemd-udevd
  root      1185  0.0  0.0  44920  3376 ?        D    08:17   0:01 /usr/lib/systemd/systemd-udevd
  root      1186  0.0  0.0      0     0 ?        D    08:17   0:00 [systemd-udevd]
  root      1187  0.0  0.0  44788  3344 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd
  root      1188  0.0  0.0      0     0 ?        D    08:17   0:00 [systemd-udevd]
  root      1189  0.0  0.0  44788  3192 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd
  root      1190  0.0  0.0  44788  3152 ?        D    08:17   0:01 /usr/lib/systemd/systemd-udevd
  root      1193  0.0  0.0      0     0 ?        D    08:17   0:00 [systemd-udevd]
  root      1198  0.0  0.0  44788  3248 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd
  root      1199  0.0  0.0  44788  3352 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd
  root      1201  0.0  0.0  44788  3280 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd
  root      1202  0.0  0.0  44788  3116 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd
  root      1203  0.0  0.0  44788  3248 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd
  root      1207  0.0  0.0  44788  3240 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd
  root      1208  0.0  0.0  44788  3220 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd
  root      1209  0.0  0.0  44788  3208 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd
  root      1210  0.0  0.0  44788  3232 ?        D    08:17   0:00 /usr/lib/systemd/systemd-udevd