IBM Support

WinCollect: Mounting SFS displays "wrong fs type, bad option, bad superblock on /dev/loop2"



An error is displayed when trying to mount .sfs file during WinCollect upgrade in the Console similar to:
wrong fs type, bad option, bad superblock on /dev/loop2


When performing the WinCollect upgrade in the console, one of the steps is to mount the .sfs file to /media/updates by using the command:
mount -o loop -t squashfs <path_file_name>.sfs /media/updates
Example: mount -t squashfs -o loop 730_QRadar_wincollectupdate-7.3.0-41.sfs /media/updates
The administrator cannot continue as they keep displaying the "wrong fs type" error.
mount -o loop -t squashfs 740_QRadar_wmount: 
       wrong fs type, bad option, bad superblock on /dev/loop2,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.
Note: The issue seen with WinCollect can occur with any .sfs file including Fix packs.


The error is related to either the file you are trying to mount is corrupted or is not a real .sfs file.

Resolving The Problem

  1. Use the file command to confirm that the downloaded file is a .sfs, for example:
    file 740_QRadar_wincollectupdate-7.3.0-41.sfs
    740_QRadar_wincollectupdate-7.3.0-41.sfs: HTML document text
  2. Verify that the file is a .sfs, but it is corrupted. A .sfs file uses the squashfs filesystem,
    ​#file 740_QRadar_wincollectupdate-7.3.0-41.sfs
    740_QRadar_wincollectupdate-7.3.0-41.sfs: Squashfs filesystem, little endian, 
    version 4.0, 23969043 bytes, 94 inodes, blocksize: 131072 bytes, 
    created: Thu Sep 24 10:44:30 2020
    1. Download the sha256 file from Fix Central.
      image 9266
    2. To calculate the sha256 of the file after it is downloaded, run the sha256 command on your QRadar appliance.
      # sha256sum 740_QRadar_wincollectupdate-7.3.0-41.sfs
      8ff8b43b6ad47ce11b3e4b4a73f23b6df3fc82bf35d4e39a990015d438ab089b  740_QRadar_wincollectupdate-7.3.0-41.sfs
    3. Use the cat command open the sha256 file from Fix Central.
       cat 740_QRadar_wincollectupdate-7.3.0-41.sha256
      Algorithm       Hash
      ---------       ----
      SHA256          8ff8b43b6ad47ce11b3e4b4a73f23b6df3fc82bf35d4e39a990015d438ab089b
    4. If the calculated value does not match the value from Fix Central, the downloaded file is not the same as the file posted on Fix Central.
    5. Download the .sfs file again from Fix Central.
  3. If the file is an HTML or file other than a .sfs, download the file again from Fix Central.

Document Location


[{"Type":"SW","Line of Business":{"code":"LOB24","label":"Security Software"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSBQAC","label":"IBM Security QRadar SIEM"},"ARM Category":[{"code":"a8m0z000000cwtwAAA","label":"WinCollect"}],"ARM Case Number":"TS004863250","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Version(s)"}]

Document Information

Modified date:
18 May 2021