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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1526537

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1526537

Title:
  blk_update_request: I/O error

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  
  On my laptop I am using the ubuntu in persistent mode with a backing files: casper-rw, home-rw. For some time in the new editions of ubuntu [ 15.04 / 15.10 / 16.04 daily (15.12) ] I meet with error: blk_update_request: I/O error, dev loop ... , sector ... .  am sure it is not a hardware problem. Please, could you try reproduce this issue 

  `/proc/cmdline`

  BOOT_IMAGE=/Ubuntu/16.04/desktop-amd64/casper/vmlinuz.efi append
  noprompt boot=casper intel_iommu=on toram showmounts persistent-
  path=/Ubuntu/16.04/desktop-amd64 persistent iso-
  scan/filename=/Ubuntu/16.04/xenial-desktop-amd64.iso cdrom-detect/try-
  usb=true

  `kern.log`

  Dec 15 21:49:25 ThinkPad kernel: [   11.507021] Bluetooth: BNEP socket layer initialized
  Dec 15 21:49:25 ThinkPad kernel: [   11.513208] blk_update_request: I/O error, dev loop0, sector 1376280
  Dec 15 21:49:25 ThinkPad kernel: [   11.544996] blk_update_request: I/O error, dev loop0, sector 1364008
  Dec 15 21:49:26 ThinkPad kernel: [   11.655626] IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready
  Dec 15 21:49:26 ThinkPad kernel: [   11.656563] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready
  Dec 15 21:49:26 ThinkPad kernel: [   11.884604] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready
  Dec 15 21:49:26 ThinkPad kernel: [   12.080950] usbcore: registered new interface driver cdc_wdm
  Dec 15 21:49:26 ThinkPad kernel: [   12.089352] qmi_wwan 2-1.4:1.0: cdc-wdm0: USB WDM device
  Dec 15 21:49:26 ThinkPad kernel: [   12.089629] qmi_wwan 2-1.4:1.0 wwan0: register 'qmi_wwan' at usb-0000:00:1d.0-1.4, WWAN/QMI device, 86:f3:f1:57:ac:04
  Dec 15 21:49:26 ThinkPad kernel: [   12.089851] usbcore: registered new interface driver qmi_wwan
  Dec 15 21:49:27 ThinkPad kernel: [   13.014113] blk_update_request: I/O error, dev loop2, sector 776360
  Dec 15 21:49:27 ThinkPad kernel: [   13.026856] blk_update_request: I/O error, dev loop2, sector 777792
  Dec 15 21:49:27 ThinkPad kernel: [   13.406901] e1000e: enp0s25 NIC Link is Up 100 Mbps Full Duplex, Flow Control: Rx/Tx
  Dec 15 21:49:27 ThinkPad kernel: [   13.406909] e1000e 0000:00:19.0 enp0s25: 10/100 speed: disabling TSO
  Dec 15 21:49:27 ThinkPad kernel: [   13.406948] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s25: link becomes ready
  Dec 15 21:49:27 ThinkPad kernel: [   13.411598] blk_update_request: I/O error, dev loop0, sector 1364024
  Dec 15 21:49:27 ThinkPad kernel: [   13.525480] blk_update_request: I/O error, dev loop2, sector 778064
  Dec 15 21:49:28 ThinkPad kernel: [   13.733896] Bluetooth: RFCOMM TTY layer initialized
  Dec 15 21:49:28 ThinkPad kernel: [   13.733906] Bluetooth: RFCOMM socket layer initialized
  Dec 15 21:49:28 ThinkPad kernel: [   13.733912] Bluetooth: RFCOMM ver 1.11
  Dec 15 21:49:28 ThinkPad kernel: [   13.758583] blk_update_request: I/O error, dev loop0, sector 1360048
  Dec 15 21:49:28 ThinkPad kernel: [   13.765377] blk_update_request: I/O error, dev loop0, sector 1364032
  Dec 15 21:49:28 ThinkPad kernel: [   13.778920] blk_update_request: I/O error, dev loop0, sector 1364040
  Dec 15 21:49:28 ThinkPad kernel: [   13.785037] blk_update_request: I/O error, dev loop0, sector 1364048
  Dec 15 21:49:28 ThinkPad gnome-session-binary[3083]: Entering running state
  Dec 15 21:49:37 ThinkPad kernel: [   22.759620] blk_update_request: 15 callbacks suppressed
  Dec 15 21:49:37 ThinkPad kernel: [   22.759623] blk_update_request: I/O error, dev loop0, sector 1364072
  Dec 15 21:49:37 ThinkPad kernel: [   22.803618] hidraw: raw HID events driver (C) Jiri Kosina
  Dec 15 21:49:37 ThinkPad kernel: [   22.806751] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
  Dec 15 21:49:37 ThinkPad kernel: [   22.806758] Bluetooth: HIDP socket layer initialized
  Dec 15 21:49:37 ThinkPad kernel: [   22.811095] hid-generic 0005:0D62:01BF.0001: unknown main item tag 0x0
  Dec 15 21:49:37 ThinkPad kernel: [   22.811211] input: Bluetooth Mouse as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0/bluetooth/hci0/hci0:11/0005:0D62:01BF.0001/input/input17
  Dec 15 21:49:37 ThinkPad kernel: [   22.811384] hid-generic 0005:0D62:01BF.0001: input,hidraw0: BLUETOOTH HID v1.39 Mouse [ Bluetooth Mouse] on ec:55:f9:fa:c6:1d
  Dec 15 21:50:41 ThinkPad kernel: [   86.683594] blk_update_request: I/O error, dev loop2, sector 2343552
  Dec 15 21:50:41 ThinkPad kernel: [   86.690626] blk_update_request: I/O error, dev loop2, sector 2339064
  Dec 15 21:50:41 ThinkPad kernel: [   86.703606] blk_update_request: I/O error, dev loop2, sector 2057600
  Dec 15 21:50:41 ThinkPad kernel: [   86.713265] blk_update_request: I/O error, dev loop2, sector 2343592
  Dec 15 21:50:41 ThinkPad kernel: [   86.715556] blk_update_request: I/O error, dev loop2, sector 2057608
  Dec 15 21:50:41 ThinkPad kernel: [   86.861531] blk_update_request: I/O error, dev loop2, sector 2339104
  Dec 15 21:50:42 ThinkPad kernel: [   87.954169] blk_update_request: I/O error, dev loop2, sector 2343632

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