I got the same dmesg output when using Startup Disk Creator to write an (L)ubuntu ISO image to a USB stick. After a very long time, and three such messages in the log, the disk creator finally claimed that it was complete. I'm not confident that the installation medium is actually OK, will try it shortly.
Details of the USB stick I used: [12274.016048] usb 3-1.4: new high-speed USB device number 10 using xhci_hcd [12274.142013] usb 3-1.4: New USB device found, idVendor=0951, idProduct=1665 [12274.142018] usb 3-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [12274.142021] usb 3-1.4: Product: DataTraveler 2.0 [12274.142024] usb 3-1.4: Manufacturer: Kingston [12274.142027] usb 3-1.4: SerialNumber: 50E549C20210BE8059BC09A9 [12274.167999] usb-storage 3-1.4:1.0: USB Mass Storage device detected [12274.168534] scsi host3: usb-storage 3-1.4:1.0 [12275.275617] scsi 3:0:0:0: Direct-Access Kingston DataTraveler 2.0 PMAP PQ: 0 ANSI: 6 [12275.276767] sd 3:0:0:0: Attached scsi generic sg1 type 0 [12276.083697] sd 3:0:0:0: [sda] 15335424 512-byte logical blocks: (7.85 GB/7.31 GiB) [12276.084529] sd 3:0:0:0: [sda] Write Protect is off [12276.084547] sd 3:0:0:0: [sda] Mode Sense: 23 00 00 00 [12276.085363] sd 3:0:0:0: [sda] No Caching mode page found [12276.085386] sd 3:0:0:0: [sda] Assuming drive cache: write through [12276.127850] sda: sda1 [12276.131198] sd 3:0:0:0: [sda] Attached SCSI removable disk -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1688920 Title: INFO: task systemd-udevd:326 blocked for more than 120 seconds. Status in systemd: Fix Released Status in linux package in Ubuntu: Incomplete Bug description: dmesg: [ 605.178422] INFO: task systemd-udevd:326 blocked for more than 120 seconds. [ 605.178434] Not tainted 4.11.0-041100rc8-generic #201704232131 [ 605.178437] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 605.178442] systemd-udevd D 0 326 1 0x00000104 [ 605.178449] Call Trace: [ 605.178467] __schedule+0x3c6/0x8c0 [ 605.178474] schedule+0x36/0x80 [ 605.178479] schedule_preempt_disabled+0xe/0x10 [ 605.178484] __mutex_lock.isra.5+0x26d/0x4e0 [ 605.178492] __mutex_lock_slowpath+0x13/0x20 [ 605.178497] ? __mutex_lock_slowpath+0x13/0x20 [ 605.178501] mutex_lock+0x2f/0x40 [ 605.178508] __blkdev_get+0x121/0x440 [ 605.178513] blkdev_get+0x12a/0x330 [ 605.178519] blkdev_open+0x5b/0x70 [ 605.178523] do_dentry_open+0x20a/0x310 [ 605.178528] ? bd_acquire+0xd0/0xd0 [ 605.178533] vfs_open+0x4e/0x80 [ 605.178540] path_openat+0x623/0x1500 [ 605.178546] ? kernfs_seq_stop_active+0x2b/0x30 [ 605.178552] do_filp_open+0x99/0x110 [ 605.178558] ? _crng_backtrack_protect+0x62/0x80 [ 605.178562] ? __check_object_size+0x100/0x19d [ 605.178567] do_sys_open+0x130/0x220 [ 605.178571] ? do_sys_open+0x130/0x220 [ 605.178576] SyS_open+0x1e/0x20 [ 605.178582] do_syscall_64+0x5b/0xc0 [ 605.178586] entry_SYSCALL64_slow_path+0x25/0x25 [ 605.178590] RIP: 0033:0x7f4a8b59bd70 [ 605.178593] RSP: 002b:00007fff0a24e0b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 605.178598] RAX: ffffffffffffffda RBX: 00007fff0a24e150 RCX: 00007f4a8b59bd70 [ 605.178600] RDX: 0000561d1157fd23 RSI: 00000000000a0800 RDI: 0000561d12af1c10 [ 605.178603] RBP: 00007fff0a24e600 R08: 0000561d1157f400 R09: 0000000000000000 [ 605.178605] R10: 0000561d12ab4e40 R11: 0000000000000246 R12: 00007fff0a24e260 [ 605.178607] R13: 0000561d12aa2010 R14: 0000561d12aaa0e0 R15: 00007fff0a24e130 ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: systemd 232-21ubuntu3 Uname: Linux 4.11.0-041100-generic x86_64 ApportVersion: 2.20.4-0ubuntu4 Architecture: amd64 CurrentDesktop: GNOME Date: Sat May 6 17:13:05 2017 InstallationDate: Installed on 2015-07-26 (650 days ago) InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150723) MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.11.0-041100-generic root=UUID=4f4435ca-b877-47a5-9065-3dd624c0514e ro rootflags=subvol=@ quiet splash vt.handoff=7 SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/15/2013 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: P14AAJ dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: SAMSUNG_NP1234567890 dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: FAB1 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1: dmi.product.name: 530U3C/530U4C dmi.product.version: 0.1 dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1688920/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
