Re: System hangs when using USB 3.0 HD with on Ubuntu

Jonas Schwertfeger
2010-04-01T13:55:04Z

[-- Attachment #1: Type: text/plain, Size: 843 bytes --]

On Thu, Apr 1, 2010 at 3:42 PM, Kay Sievers <kay.sievers@vrfy.org> wrote:
>> Renamed both /usr/bin/udisks
>
> That's the commandline tool, you need to check for something like:
>  /usr/lib/udisks/udisks-daemon
>
> Can you run as root:
>  udevadm test /sys/class/block/sd...
> and post the output here. So we see what udev would run on bootup.

Since the drive doesn't even show up as a block device when connected
to the USB 3.0 port I can't run that command for the device directly.
However, what I completely forgot to mention is that the drive works
just fine when connected to a USB 2.0 port. This was why I initially
thought the xHCI driver is to blame, but now that we are investigating
udev this does seem kind of odd to me. So, attached is the udevadm
test output with the drive connected to a USB 2.0 port.

-Jonas

[-- Attachment #2: udev_test_sdb.log --]
[-- Type: text/x-log, Size: 18238 bytes --]

run_command: calling: test
udevadm_test: version 151
parse_file: reading '/lib/udev/rules.d/40-fuse-utils.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-gnupg.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-hplip.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-ia64.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-infiniband.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-isdn.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-libgphoto2-2.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-libpisock9.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-libsane.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-pilot-links.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-ppc.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-usb-media-players.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-xserver-xorg-video-intel.rules' as rules file
parse_file: reading '/lib/udev/rules.d/40-zaptel.rules' as rules file
parse_file: reading '/lib/udev/rules.d/45-fuse.rules' as rules file
parse_file: reading '/lib/udev/rules.d/45-libmtp8.rules' as rules file
parse_file: reading '/lib/udev/rules.d/50-firmware.rules' as rules file
parse_file: reading '/lib/udev/rules.d/50-udev-default.rules' as rules file
parse_file: reading '/lib/udev/rules.d/55-Argyll.rules' as rules file
parse_file: reading '/lib/udev/rules.d/55-dm.rules' as rules file
add_rule: name empty, node creation suppressed
parse_file: reading '/lib/udev/rules.d/56-hpmud_support.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-cdrom_id.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-floppy.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-alsa.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-input.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-serial.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-storage-dm.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-storage-tape.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-storage.rules' as rules file
parse_file: reading '/lib/udev/rules.d/60-persistent-v4l.rules' as rules file
parse_file: reading '/lib/udev/rules.d/61-gnome-bluetooth-rfkill.rules' as rules file
parse_file: reading '/lib/udev/rules.d/61-mobile-action.rules' as rules file
parse_file: reading '/lib/udev/rules.d/61-option-modem-modeswitch.rules' as rules file
parse_file: reading '/lib/udev/rules.d/61-persistent-storage-edd.rules' as rules file
parse_file: reading '/lib/udev/rules.d/64-device-mapper.rules' as rules file
parse_file: reading '/lib/udev/rules.d/64-xorg-xkb.rules' as rules file
parse_file: reading '/lib/udev/rules.d/65-xorg-evdev.rules' as rules file
parse_file: reading '/lib/udev/rules.d/66-xorg-synaptics.rules' as rules file
parse_file: reading '/lib/udev/rules.d/69-xorg-vmmouse.rules' as rules file
parse_file: reading '/lib/udev/rules.d/69-xserver-xorg-input-wacom.rules' as rules file
parse_file: reading '/lib/udev/rules.d/70-acl.rules' as rules file
parse_file: reading '/lib/udev/rules.d/70-hid2hci.rules' as rules file
parse_file: reading '/etc/udev/rules.d/70-persistent-cd.rules' as rules file
parse_file: reading '/etc/udev/rules.d/70-persistent-net.rules' as rules file
parse_file: reading '/lib/udev/rules.d/70-printers.rules' as rules file
parse_file: reading '/lib/udev/rules.d/75-cd-aliases-generator.rules' as rules file
parse_file: reading '/lib/udev/rules.d/75-net-description.rules' as rules file
parse_file: reading '/lib/udev/rules.d/75-persistent-net-generator.rules' as rules file
parse_file: reading '/lib/udev/rules.d/75-tty-description.rules' as rules file
parse_file: reading '/lib/udev/rules.d/77-mm-ericsson-mbm.rules' as rules file
parse_file: reading '/lib/udev/rules.d/77-mm-longcheer-port-types.rules' as rules file
parse_file: reading '/lib/udev/rules.d/77-mm-zte-port-types.rules' as rules file
parse_file: reading '/lib/udev/rules.d/78-graphics-card.rules' as rules file
parse_file: reading '/lib/udev/rules.d/78-sound-card.rules' as rules file
parse_file: reading '/lib/udev/rules.d/79-fstab_import.rules' as rules file
parse_file: reading '/lib/udev/rules.d/80-alsa.rules' as rules file
parse_file: reading '/lib/udev/rules.d/80-drivers.rules' as rules file
parse_file: reading '/lib/udev/rules.d/80-libgpod.rules' as rules file
parse_file: reading '/lib/udev/rules.d/80-udisks.rules' as rules file
parse_file: reading '/lib/udev/rules.d/85-brltty.rules' as rules file
parse_file: reading '/lib/udev/rules.d/85-console-setup.rules' as rules file
parse_file: reading '/lib/udev/rules.d/85-dmraid.rules' as rules file
parse_file: reading '/lib/udev/rules.d/85-hdparm.rules' as rules file
parse_file: reading '/lib/udev/rules.d/85-hplj10xx.rules' as rules file
parse_file: reading '/lib/udev/rules.d/85-pcmcia.rules' as rules file
parse_file: reading '/lib/udev/rules.d/85-regulatory.rules' as rules file
parse_file: reading '/lib/udev/rules.d/85-usbmuxd.rules' as rules file
parse_file: reading '/lib/udev/rules.d/90-hal.rules' as rules file
parse_file: reading '/lib/udev/rules.d/90-pulseaudio.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-keyboard-force-release.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-keymap.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-kpartx.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-udev-late.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-dell.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-fujitsu.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-gateway.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-ibm.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-lenovo.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-upower-battery-recall-toshiba.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-upower-csr.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-upower-hid.rules' as rules file
parse_file: reading '/lib/udev/rules.d/95-upower-wup.rules' as rules file
parse_file: reading '/lib/udev/rules.d/97-bluetooth.rules' as rules file
udev_rules_new: rules use 210456 bytes tokens (17538 * 12 bytes), 33791 bytes buffer
udev_rules_new: temporary index used 55620 bytes (2781 * 20 bytes)
udev_device_new_from_syspath: device 0x7f2546c418e0 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb'
udev_device_new_from_syspath: device 0x7f2546c40dc0 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb'
udev_device_read_db: device 0x7f2546c40dc0 filled with db file data
udev_device_new_from_syspath: device 0x7f2546c40630 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0'
udev_device_new_from_syspath: device 0x7f2546c41210 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0'
udev_device_new_from_syspath: device 0x7f2546c41510 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24'
udev_device_new_from_syspath: device 0x7f2546c365f0 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0'
udev_device_new_from_syspath: device 0x7f2546c368c0 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2'
udev_device_new_from_syspath: device 0x7f2546c36bb0 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1'
udev_device_new_from_syspath: device 0x7f2546c36e60 has devpath '/devices/pci0000:00/0000:00:1a.7'
udev_device_new_from_syspath: device 0x7f2546c37110 has devpath '/devices/pci0000:00'
udev_rules_apply_to_event: LINK 'block/8:16' /lib/udev/rules.d/50-udev-default.rules:3
udev_rules_apply_to_event: GROUP 6 /lib/udev/rules.d/50-udev-default.rules:77
udev_rules_apply_to_event: IMPORT 'usb_id --export /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb' /lib/udev/rules.d/60-persistent-storage.rules:22
util_run_program: 'usb_id --export /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb' started
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_VENDOR=BUFFALO'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_VENDOR_ENC=BUFFALO\x20'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_VENDOR_ID=0411'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_MODEL=External_HDD'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_MODEL_ENC=External\x20HDD\x20\x20\x20\x20'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_MODEL_ID=0184'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_REVISION=0100'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_SERIAL=BUFFALO_External_HDD_0000010155FF-0:0'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_SERIAL_SHORT=0000010155FF'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_TYPE=disk'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_INSTANCE=0:0'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_BUS=usb'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_USB_INTERFACES=:080650:'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_USB_INTERFACE_NUM=00'
util_run_program: '/lib/udev/usb_id' (stdout) 'ID_USB_DRIVER=usb-storage'
util_run_program: 'usb_id --export /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb' returned with exitcode 0
udev_rules_apply_to_event: LINK 'disk/by-id/usb-BUFFALO_External_HDD_0000010155FF-0:0' /lib/udev/rules.d/60-persistent-storage.rules:30
udev_rules_apply_to_event: IMPORT 'path_id /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb' /lib/udev/rules.d/60-persistent-storage.rules:47
util_run_program: 'path_id /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb' started
util_run_program: '/lib/udev/path_id' (stdout) 'ID_PATH=pci-0000:00:1a.7-usb-0:2:1.0-scsi-0:0:0:0'
util_run_program: 'path_id /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb' returned with exitcode 0
udev_rules_apply_to_event: LINK 'disk/by-path/pci-0000:00:1a.7-usb-0:2:1.0-scsi-0:0:0:0' /lib/udev/rules.d/60-persistent-storage.rules:48
udev_rules_apply_to_event: IMPORT '/sbin/blkid -o udev -p /dev/sdb' /lib/udev/rules.d/60-persistent-storage.rules:60
util_run_program: '/sbin/blkid -o udev -p /dev/sdb' started
util_run_program: '/sbin/blkid' (stdout) 'ID_PART_TABLE_TYPE=dos'
util_run_program: '/sbin/blkid -o udev -p /dev/sdb' returned with exitcode 0
udev_rules_apply_to_event: IMPORT 'edd_id --export /dev/sdb' /lib/udev/rules.d/61-persistent-storage-edd.rules:8
util_run_program: 'edd_id --export /dev/sdb' started
util_run_program: '/lib/udev/edd_id' (stderr) 'no kernel EDD support'
util_run_program: 'edd_id --export /dev/sdb' returned with exitcode 2
udev_rules_apply_to_event: IMPORT 'udisks-part-id /dev/sdb' /lib/udev/rules.d/80-udisks.rules:96
util_run_program: 'udisks-part-id /dev/sdb' started
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'libudev: udev_device_new_from_syspath: device 0xf2a2f0 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb''
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'libudev: udev_device_read_db: device 0xf2a2f0 filled with db file data'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'using device_file=/dev/sdb syspath=/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb, offset=0 ao=0 and number=0 for /dev/sdb'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'Entering MS-DOS parser (offset=0, size=1000204886016)'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'MSDOS_MAGIC found'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'looking at part 0 (offset 32256, size 1000202241024, type 0x83)'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'new part entry'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'looking at part 1 (offset 0, size 0, type 0x00)'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'new part entry'
util_run_program: '/lib/udev/udisks-part-id' (stdout) 'UDISKS_PARTITION_TABLE=1'
util_run_program: '/lib/udev/udisks-part-id' (stdout) 'UDISKS_PARTITION_TABLE_SCHEME=mbr'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'looking at part 2 (offset 0, size 0, type 0x00)'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'new part entry'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'looking at part 3 (offset 0, size 0, type 0x00)'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'new part entry'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'Exiting MS-DOS parser'
util_run_program: '/lib/udev/udisks-part-id' (stderr) 'MSDOS partition table detected'
util_run_program: '/lib/udev/udisks-part-id' (stdout) 'UDISKS_PARTITION_TABLE_COUNT=1'
util_run_program: 'udisks-part-id /dev/sdb' returned with exitcode 0
udev_rules_apply_to_event: IMPORT 'udisks-probe-ata-smart /dev/sdb' /lib/udev/rules.d/80-udisks.rules:120
util_run_program: 'udisks-probe-ata-smart /dev/sdb' started
util_run_program: '/lib/udev/udisks-probe-ata-smart' (stderr) 'libudev: udev_device_new_from_syspath: device 0x11bd790 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb''
util_run_program: '/lib/udev/udisks-probe-ata-smart' (stderr) 'libudev: udev_device_read_db: '
util_run_program: '/lib/udev/udisks-probe-ata-smart' (stderr) 'device 0x11bd790 filled with db file data'
util_run_program: '/lib/udev/udisks-probe-ata-smart' (stderr) 'libudev: udev_device_new_from_syspath: device 0x11be030 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0''
util_run_program: '/lib/udev/udisks-probe-ata-smart' (stderr) 'libudev: udev_device_new_from_syspath: device 0x11bee70 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0''
util_run_program: '/lib/udev/udisks-probe-ata-smart' (stderr) 'libudev: udev_device_new_from_syspath: device 0x11bf1b0 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24''
util_run_program: '/lib/udev/udisks-probe-ata-smart' (stderr) 'libudev: udev_device_new_from_syspath: device 0x11bf4e0 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0''
util_run_program: '/lib/udev/udisks-probe-ata-smart' (stderr) 'libudev: udev_device_new_from_syspath: device 0x11bf7f0 has devpath '/devices/pci0000:00/0000:00:1a.7/usb1/1-2''
util_run_program: '/lib/udev/udisks-probe-ata-smart' (stderr) 'Failed to determine if smart is available for /dev/sdb: Operation not supported'
util_run_program: 'udisks-probe-ata-smart /dev/sdb' returned with exitcode 1
udev_rules_apply_to_event: RUN '/lib/udev/hdparm' /lib/udev/rules.d/85-hdparm.rules:2
udev_rules_apply_to_event: RUN 'socket:@/org/freedesktop/hal/udev_event' /lib/udev/rules.d/90-hal.rules:2
udev_rules_apply_to_event: RUN '/sbin/modprobe -Qba dm-multipath' /lib/udev/rules.d/95-kpartx.rules:10
udev_event_execute_rules: no node name set, will use kernel supplied name 'sdb'
udev_device_update_db: created db file for '/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb' in '/dev/.udev/db/block:sdb'
udev_node_add: creating device node '/dev/sdb', devnum=8:16, mode=0660, uid=0, gid=6
udev_node_mknod: preserve file '/dev/sdb', because it has correct dev_t
node_symlink: preserve already existing symlink '/dev/block/8:16' to '../sdb'
link_find_prioritized: found '/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb' claiming '/dev/.udev/links/disk\x2fby-id\x2fusb-BUFFALO_External_HDD_0000010155FF-0:0'
link_update: creating link '/dev/disk/by-id/usb-BUFFALO_External_HDD_0000010155FF-0:0' to '/dev/sdb'
node_symlink: preserve already existing symlink '/dev/disk/by-id/usb-BUFFALO_External_HDD_0000010155FF-0:0' to '../../sdb'
link_find_prioritized: found '/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb' claiming '/dev/.udev/links/disk\x2fby-path\x2fpci-0000:00:1a.7-usb-0:2:1.0-scsi-0:0:0:0'
link_update: creating link '/dev/disk/by-path/pci-0000:00:1a.7-usb-0:2:1.0-scsi-0:0:0:0' to '/dev/sdb'
node_symlink: preserve already existing symlink '/dev/disk/by-path/pci-0000:00:1a.7-usb-0:2:1.0-scsi-0:0:0:0' to '../../sdb'
udevadm_test: UDEV_LOG=6
udevadm_test: DEVPATH=/devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/host24/target24:0:0/24:0:0:0/block/sdb
udevadm_test: MAJOR=8
udevadm_test: MINOR=16
udevadm_test: DEVNAME=/dev/sdb
udevadm_test: DEVTYPE=disk
udevadm_test: ACTION=add
udevadm_test: SUBSYSTEM=block
udevadm_test: DEVLINKS=/dev/block/8:16 /dev/disk/by-id/usb-BUFFALO_External_HDD_0000010155FF-0:0 /dev/disk/by-path/pci-0000:00:1a.7-usb-0:2:1.0-scsi-0:0:0:0
udevadm_test: ID_VENDOR=BUFFALO
udevadm_test: ID_VENDOR_ENC=BUFFALO\x20
udevadm_test: ID_VENDOR_ID=0411
udevadm_test: ID_MODEL=External_HDD
udevadm_test: ID_MODEL_ENC=External\x20HDD\x20\x20\x20\x20
udevadm_test: ID_MODEL_ID=0184
udevadm_test: ID_REVISION=0100
udevadm_test: ID_SERIAL=BUFFALO_External_HDD_0000010155FF-0:0
udevadm_test: ID_SERIAL_SHORT=0000010155FF
udevadm_test: ID_TYPE=disk
udevadm_test: ID_INSTANCE=0:0
udevadm_test: ID_BUS=usb
udevadm_test: ID_USB_INTERFACES=:080650:
udevadm_test: ID_USB_INTERFACE_NUM=00
udevadm_test: ID_USB_DRIVER=usb-storage
udevadm_test: ID_PATH=pci-0000:00:1a.7-usb-0:2:1.0-scsi-0:0:0:0
udevadm_test: ID_PART_TABLE_TYPE=dos
udevadm_test: UDISKS_PRESENTATION_NOPOLICY=0
udevadm_test: UDISKS_PARTITION_TABLE=1
udevadm_test: UDISKS_PARTITION_TABLE_SCHEME=mbr
udevadm_test: UDISKS_PARTITION_TABLE_COUNT=1
udevadm_test: run: '/lib/udev/hdparm'
udevadm_test: run: 'socket:@/org/freedesktop/hal/udev_event'
udevadm_test: run: '/sbin/modprobe -Qba dm-multipath'
This program is for debugging only, it does not run any program,
specified by a RUN key. It may show incorrect results, because
some values may be different, or not available at a simulation run.