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MX80 Junos can't boot , stay at debugging subshell

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  • 1.  MX80 Junos can't boot , stay at debugging subshell

    Posted 05-12-2018 00:05

    Hello everyone,

     

    The router MX80 loaded the following error, Tried to format the installation with a USB disk, invalid If there is a similar solution, please check for help. Thank you.

     

    ***** FILE SYSTEM WAS MODIFIED *****
    mount_cd9660: /dev/da2s2a: No such file or directory
    ERROR: discover_install_drive: /mnt/tmp/preinstall/install.conf not found
    You are now in a debugging subshell (you may not see a prompt)...

     

    # df
    Filesystem  512-blocks  Used   Avail Capacity  Mounted on
    /dev/md0         44916 44916       0   100%    /
    devfs                2     2       0   100%    /dev
    devfs                2     2       0   100%    /dev
    /dev/da1s1f    5872908 64068 5339008     1%    /mnt
    # fsck /dev/da1s1f
    ** /dev/da1s1f (NO WRITE)
    ** Last Mounted on /mnt
    ** Phase 1 - Check Blocks and Sizes
    ** Phase 2 - Check Pathnames
    ** Phase 3 - Check Connectivity
    ** Phase 4 - Check Reference Counts
    ** Phase 5 - Check Cyl groups
    355 files, 16017 used, 1452210 free (146 frags, 181508 blocks, 0.0% fragmentation)
    # mkdir /dev/da2s2a
    mkdir: /dev/da2s2a: Operation not supported
    # ^C
    # fsck /dev/das1sf
    fsck: cannot open `/dev/das1sf': No such file or directory
    # fsck /dev/da1s1f
    ** /dev/da1s1f (NO WRITE)
    ** Last Mounted on /mnt
    ** Phase 1 - Check Blocks and Sizes
    ** Phase 2 - Check Pathnames
    ** Phase 3 - Check Connectivity
    ** Phase 4 - Check Reference Counts
    ** Phase 5 - Check Cyl groups
    355 files, 16017 used, 1452210 free (146 frags, 181508 blocks, 0.0% fragmentation)
    # fsck -y ufs /dev/ad1s1a
    fsck: cannot open `/dev/ufs': No such file or directory
    # fsck -y ufs /dev/ad1s1f
    fsck: cannot open `/dev/ufs': No such file or directory
    # fsck -y ufs /dev/da1s1f
    fsck: cannot open `/dev/ufs': No such file or directory

     

    # fsck -y /dev/md0
    fsck: exec fsck_cd9660 for /dev/md0: No such file or directory
    # fsck -y /dev/admd0
    fsck: cannot open `/dev/admd0': No such file or director

     

    ---(more)---root> init died (signal 0, exit 11)
    panic: Going nowhere without my init!
    ###Entering boot mastership relinquish phase
    KDB: enter: panic
    [thread pid 1 tid 100006 ]
    Stopped at      kdb_enter+0x1a4:        addis   r3, r0, -0x5f7e
    db>
    db>
    db>
    db>
    db> boot
    No such command
    db> reboot

     

     

     

     



  • 2.  RE: MX80 Junos can't boot , stay at debugging subshell

    Posted 05-14-2018 22:25

    try to reinstall software with flash formatting 



  • 3.  RE: MX80 Junos can't boot , stay at debugging subshell

    Posted 05-15-2018 09:28

    Hello akushner,

     

         Thank you for your reply, 

         I tried to use the install-media file to format the installation using a USB stick.

         However, still getting an error as follows:

     

         ***** FILE SYSTEM WAS MODIFIED *****
    mount_cd9660: /dev/da2s2a: No such file or directory
    ERROR: discover_install_drive: /mnt/tmp/preinstall/install.conf not found
    You are now in a debugging subshell (you may not see a prompt)...

     

        

     

      



  • 4.  RE: MX80 Junos can't boot , stay at debugging subshell

     
    Posted 05-15-2018 04:08

    This kb notes the issue and possible recovery paths.

    https://kb.juniper.net/InfoCenter/index?page=content&id=KB26175

     

     

     



  • 5.  RE: MX80 Junos can't boot , stay at debugging subshell

    Posted 05-15-2018 09:30

    Hello spuluka,

     

    Thank you very much for your reply,

     

    By formatting the installation, you will still be prompted with the following error

     

    ***** FILE SYSTEM WAS MODIFIED *****
    mount_cd9660: /dev/da2s2a: No such file or directory
    ERROR: discover_install_drive: /mnt/tmp/preinstall/install.conf not found
    You are now in a debugging subshell (you may not see a prompt)...

     



  • 6.  RE: MX80 Junos can't boot , stay at debugging subshell
    Best Answer

     
    Posted 05-16-2018 04:57

    Looks like you will need to open a JTAC case.  The kb notes that if these recovery methods don't work then a case is required proceed.  I would suspect there is a hardware problem at this point.