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Thread: Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

  1. #1
    Join Date
    Jan 2007
    Beans
    763
    Distro
    Ubuntu 18.04 Bionic Beaver

    Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

    I have a machine running as a file server on Ubuntu 16.04.5. After the latest kernel update (4.4.0-139-generic #165-Ubuntu SMP Wed Oct 24 10:58:50 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux) I am having a problem.

    I backup this server by mounting an external 4 TB external USB HDD, which is formatted with LUKS encryption and ext4. It mounts fine, I can do my backup, but when I unmount it (by right clicking the icon in the task bar and clicking Safely Remove), the entire system freezes hard... no mouse, no keyboard, Ctrl-Alt-Del doesn't work, etc. I have to hit the reset button to reboot.

    I normally run these backups weekly and this is the first time I've had this problem, so I think it's related to the latest kernel update. I backup to two of these external drives, I'm trying the other one now to see what happens, but I'll have to post this before I attempt to unmount since I'll lose my post if the machine freezes again.

    With the drive mounted, lsusb returns:
    Code:
    Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 003 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
    Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 009 Device 002: ID 0411:0257 BUFFALO INC. (formerly MelCo., Inc.) 
    Bus 009 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 008 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 007 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 006 Device 002: ID 051d:0003 American Power Conversion UPS
    Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    The Bus 009 Device 002: ID 0411:0257 BUFFALO INC. (formerly MelCo., Inc.) is the external drive.

    dmesg | grep usb returns:

    Code:
    [  439.851502] usb 9-2: new SuperSpeed USB device number 2 using xhci_hcd
    [  439.871513] usb 9-2: New USB device found, idVendor=0411, idProduct=0257
    [  439.871522] usb 9-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
    [  439.871527] usb 9-2: Product: HD-LCU3
    [  439.871531] usb 9-2: Manufacturer: BUFFALO
    [  439.871535] usb 9-2: SerialNumber: 000000090000A83E
    [  439.903822] usb-storage 9-2:1.0: USB Mass Storage device detected
    [  439.904059] scsi host6: usb-storage 9-2:1.0
    [  439.904656] usbcore: registered new interface driver usb-storage
    [  439.907133] usbcore: registered new interface driver uas
    Once again, mounting isn't the issue. Unmounting is causing the hard freeze. I'm going to try manually unmounting, closing the LUKS volume, and then unplugging the drive and see what happens.
    Current 'buntu systems: Server 18.04.2 LTS, Mythbuntu 16.04 LTS, Ubuntu 16.04.1 LTS / Retired: 14.04 LTS, 10.04 LTS, 8.04 LTS
    Been using ubuntu since 6.04 (13 years!)

  2. #2
    Join Date
    Jan 2007
    Beans
    763
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

    Update: Manually unmounting etc. worked. But when I right clicked and chose Safely Remove, which just disconnects the USB driver, the GUI hung but i could still access the server via SSH. I tried remounting the drive but with the GUI hung it didn't mount automatically. I then unplugged the drive and the kernel hard hung again.

    I manually booted the previous kernel (4.4.0-138) and the USB drive mount/dismount work correctly again. So it's an issue with the -139 kernel.

    Anyone else seeing similar problems with 4.4.0-139?
    Current 'buntu systems: Server 18.04.2 LTS, Mythbuntu 16.04 LTS, Ubuntu 16.04.1 LTS / Retired: 14.04 LTS, 10.04 LTS, 8.04 LTS
    Been using ubuntu since 6.04 (13 years!)

  3. #3
    Join Date
    Nov 2018
    Beans
    1

    Re: Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

    same thing with ubuntu 14.04 kernel 4.4.0-139 but only on usb 3.0.
    on usb 2.0 things are OK.
    Last edited by ciniset; November 19th, 2018 at 02:47 AM.

  4. #4
    Join Date
    Nov 2018
    Beans
    1

    Re: Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

    Same thing here with ubuntu 16.04 and kernel 4.4.0-139

  5. #5
    Join Date
    Nov 2018
    Beans
    1

    Re: Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

    This appears to be a kernel bug. There is a bug report on Launchpad, so this will hopefully get fixed with the next kernel. But adding some heat to that bug probably won't hurt ...

  6. #6
    Join Date
    Jan 2007
    Beans
    763
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

    From reading it appears that 4.4.0-140 still has the issue. Have to wait impatiently for 4.4.0.141 I guess.

    In the meantime I've uninstalled 4.4.0-139 and am not installing 4.4.0-140.

    I used the command sudo apt-mark hold 4.4.0-138-generic to stay at 138 until this issue is resolved.
    Current 'buntu systems: Server 18.04.2 LTS, Mythbuntu 16.04 LTS, Ubuntu 16.04.1 LTS / Retired: 14.04 LTS, 10.04 LTS, 8.04 LTS
    Been using ubuntu since 6.04 (13 years!)

  7. #7
    Join Date
    Feb 2011
    Beans
    1

    Re: Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

    The same problem here withUbuntu 16.04.5 LTS, kernel 4.4.0-141

  8. #8
    Join Date
    Nov 2008
    Location
    Toronto Canada
    Beans
    963
    Distro
    Ubuntu Mate 18.04 Bionic Beaver

    Re: Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

    Same problem persists with the 4.4.0-141-lowlatency kernel using Ubuntu Studio 14.04. Seems to only affect USB 3.0 ports.

  9. #9
    Join Date
    Dec 2013
    Beans
    31

    Re: Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

    Hello,
    I got the same issue whatever the USB drive is. I have a Lenovo P50.
    Code:
    ~$ uname -a
    Linux HanaYoriDango 4.4.0-141-generic #167-Ubuntu SMP Wed Dec 5 10:40:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
    
    ~$ uname -r
    4.4.0-141-generic
    
    ~$ lsb_release -a
    No LSB modules are available.
    Distributor ID:    Ubuntu
    Description:    Ubuntu 16.04.5 LTS
    Release:    16.04
    Codename:    xenial
    I didn't try unmounting using command line but if it is a bypass, it will fit for a while. I'll try.
    If you are aware of any patch, I'll be glad too
    Isagarran

  10. #10
    Join Date
    Jul 2006
    Beans
    Hidden!

    Re: Ubuntu 16.04.5 kernel 4.4.0-139 hard freezes when unmounting USB drive

    One workaround is to install a newer kernel such as the HWE kernel:
    Code:
    apt-get install --install-recommends linux-generic-hwe-16.04
    (or linux-lowlatency-hwe-16.04, etc. if you need something else)

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