Gfilui

Top will give me the following: (94 % CPU load from PID 28055)

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 
28055 root 39 19 1295192 1,167g 3120 R 93,8 7,5 65:49.38 systemd-udevd 

When I do strace -p 28055 I get following lines repeating themselves to infinity:

getrandom("246306216<340244a256|34352257334223227304", 16, GRND_NONBLOCK) = 16
getrandom("j216331 361|X2413332702602023772243537", 16, GRND_NONBLOCK) = 16
getrandom("3630127vkE3511633623314366yt272307", 16, GRND_NONBLOCK) = 16
getrandom("U2342352763325737314q301272i301Wt", 16, GRND_NONBLOCK) = 16
getrandom("2232724426365251335263233.3473263]2054", 16, GRND_NONBLOCK) = 16
getrandom("366,{+Ttt2716z257N^235r,", 16, GRND_NONBLOCK) = 16
epoll_wait(10, [EPOLLIN, u32=798983008, u64=94889511453536], 11, 0) = 1
clock_gettime(CLOCK_BOOTTIME, 7011, 470364038) = 0
epoll_wait(10, [EPOLLIN, u32=798983008, u64=94889511453536], 11, 0) = 1
clock_gettime(CLOCK_BOOTTIME, 7011, 470404228) = 0
recvmsg(4, msg_name(12)=sa_family=AF_NETLINK, pid=0, groups=00000001, msg_iov(1)=["change@/devices/pci0000:00/0000:"..., 8192], msg_controllen=32, [cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, pid=0, uid=0, gid=0], msg_flags=0, 0) = 299

udevadm monitor will give out these line, which also repeats itself to infinity:

KERNEL[66275.112602] change /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/host4/target4:0:0/4:0:0:0/block/sdb (block)

I have no idea where the problem lies. Any tip how to go forward inspecting this problem? Thx...

Ubuntu 16.04, 64 bits, 4.13.0-37-generic

PS: Question moved from StackOverflow to here. Other reports of similar problems on forums did not give any real solution.

PS2: Added command outputs after the first comment. First I omited them because I was not convinced of any connection to the first problem, but now I am no longer sure. Thus here some more testing:

journalctl

Mar 20 10:58:36 cosy kernel: sd 4:0:0:0: ioctl_internal_command return code = 8000002
Mar 20 10:58:36 cosy kernel: sd 4:0:0:0: Sense Key : Aborted Command [current]
Mar 20 10:58:36 cosy kernel: sd 4:0:0:0: Add. Sense: No additional sense information
Mar 20 10:58:36 cosy systemd-udevd[382]: inotify_add_watch(9, /dev/sdb1, 10) failed: No such file or directory

(the above output repeats itself to infinity)

dmesg

[72070.670913] sdb: sdb1
[72070.745597] sd 4:0:0:0: ioctl_internal_command return code = 8000002
[72070.745600] sd 4:0:0:0: Sense Key : Aborted Command [current] 
[72070.745601] sd 4:0:0:0: Add. Sense: No additional sense information
[72070.747604] sdb: detected capacity change from 681574400 to 0
[72070.991468] sd 4:0:0:0: ioctl_internal_command return code = 8000002

/lib/systemd/systemd-udevd -D

adding watch on '/dev/sdb'
created db file '/run/udev/data/b8:16' for '/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/host4/target4:0:0/4:0:0:0/block/sdb'
passed device to netlink monitor 0x556a9c04b5d0
seq 4896728 processed
passed 282 byte device to netlink monitor 0x556a9c051740seq 4896729 running

removing watch on '/dev/sdb1'
value '[dmi/id]sys_vendor' is 'System manufacturer'
value '[dmi/id]sys_vendor' is 'System manufacturer'
no reference left, remove '/dev/disk/by-id/usb-BUFFALO_HD-HXU3_00000204B9AC-0:0-part1'
no reference left, remove '/dev/disk/by-label/UTIL_HDHXU3'
no reference left, remove '/dev/disk/by-path/pci-0000:00:1d.0-usb-0:1.4:1.0-scsi-0:0:0:0-part1'
no reference left, remove '/dev/disk/by-uuid/6BA5-31BF'
passed device to netlink monitor 0x556a9c04b5d0
seq 4896729 processed
passed 263 byte device to netlink monitor 0x556a9c051740
^Cseq 4896730 running
removing watch on '/dev/sdb'
value '[dmi/id]sys_vendor' is 'System manufacturer'
value '[dmi/id]sys_vendor' is 'System manufacturer'
IMPORT builtin 'usb_id' /lib/udev/rules.d/60-persistent-storage.rules:41
/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0: if_class 8 protocol 6
LINK 'disk/by-id/usb-BUFFALO_HD-HXU3_00000204B9AC-0:0' /lib/udev/rules.d/60-persistent-storage.rules:46
IMPORT builtin 'path_id' /lib/udev/rules.d/60-persistent-storage.rules:64
LINK 'disk/by-path/pci-0000:00:1d.0-usb-0:1.4:1.0-scsi-0:0:0:0' /lib/udev/rules.d/60-persistent-storage.rules:65
IMPORT builtin 'blkid' /lib/udev/rules.d/60-persistent-storage.rules:76
probe /dev/sdb raid offset=0
handling device node '/dev/sdb', devnum=b8:16, mode=0600, uid=0, gid=0
preserve already existing symlink '/dev/block/8:16' to '../sdb'
found 'b8:16' claiming '/run/udev/links/x2fdiskx2fby-idx2fusb-BUFFALO_HD-HXU3_00000204B9AC-0:0'
creating link '/dev/disk/by-id/usb-BUFFALO_HD-HXU3_00000204B9AC-0:0' to '/dev/sdb'
preserve already existing symlink '/dev/disk/by-id/usb-BUFFALO_HD-HXU3_00000204B9AC-0:0' to '../../sdb'
found 'b8:16' claiming '/run/udev/links/x2fdiskx2fby-pathx2fpci-0000:00:1d.0-usb-0:1.4:1.0-scsi-0:0:0:0'
creating link '/dev/disk/by-path/pci-0000:00:1d.0-usb-0:1.4:1.0-scsi-0:0:0:0' to '/dev/sdb'
preserve already existing symlink '/dev/disk/by-path/pci-0000:00:1d.0-usb-0:1.4:1.0-scsi-0:0:0:0' to '../../sdb'
created db file '/run/udev/data/b8:16' for '/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/host4/target4:0:0/4:0:0:0/block/sdb'

Now i guess it has to do with a USB external HD. But i need it as well ...

For my Dell laptop this problem is due to the Touchpad.

$ udevadm monitor
Eyl 03 22:02:58 Inspiron systemd-udevd[380]: Process 'hid2hci
--method=dell --devpath=/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.6/2-1.6.2/2-1.6.2:1.0' failed with exit code 1.

$ cat /sys/bus/usb/devices/2-1/2-1.6/2-1.6.2/id*
8162 413c

$ lsusb -d 413c:8162
Bus 002 Device 006: ID 413c:8162 Dell Computer Corp. Integrated Touchpad [Synaptics]

To stop systemd-udevd:

sudo systemctl stop systemd-udevd systemd-udevd-control.socket systemd-udevd-kernel.socket

For more info:

• systemd-udevd uses too much CPU