[SOLVED] Unable to run e2fsck /dev/sdb1 is in use

[Xentrk]

I am getting disk error messages my USB drives that I have entware and ab-solution 3 installed. Both are formatted as EXT2.

kernel: EXT2-fs (sdb1): previous I/O error to superblock detected

As a result, I need to run the e2fsck command. I first run the services-stop script which contains the code

/opt/etc/init.d/rc.unslung stop

I issue the command umount –l /dev/sdb1. As seen below, my USB is unmount status

But when I try to run the e2fsck command, I get the /dev/sdb1 is in use. E2fsck: Cannot continue, aborting.

Is there another process locking up these devices that I need to kill before I can run e2fsck them? I turned off SMB on the web GUI but no change in status.

 

[Nullity]

"fuser" can show you who's using it.

 

[Xentrk]

"fuser" can show you who's using it.

Thank you @Nullity,

I tried the command but received -sh: fuser: not found
I did a search of entware packages and see there is a package:

fuse-utils - 2.9.0-2 - FUSE (Filesystem in UserSpacE) This package contains the FUSE utilities. - fusermount - ulockmgr_server

I installed the package successfully. The command is still not recognized. Searching the www for more information.

 

[ColinTaylor]

fuser is normally part of psmisc. fuse is something completely different

 

[john9527]

Do you have a swap file defined on the USB?

 

[Xentrk]

Do you have a swap file defined on the USB?

I do not....and I from the research I did yesterday, I'm starting to think that may be the reason I get the error messages. I formatted the entire USB as ext2 with no swap space...

 

[Xentrk]

fuser is normally part of psmisc. fuse is something completely different

That is the one! Thanks @ColinTaylor.

admin@RT-AC88U-5248:/tmp/etc# fuser
No process specification given
Usage: fuser [-fMuvw] [-a|-s] [-4|-6] [-c|-m|-n SPACE] [-k [-i] [-SIGNAL]] NAME...
       fuser -l
       fuser -V
Show which processes use the named files, sockets, or filesystems.
  -a,--all              display unused files too
  -i,--interactive      ask before killing (ignored without -k)
  -k,--kill             kill processes accessing the named file
  -l,--list-signals     list available signal names
  -m,--mount            show all processes using the named filesystems or block device
  -M,--ismountpoint     fulfill request only if NAME is a mount point
  -n,--namespace SPACE  search in this name space (file, udp, or tcp)
  -s,--silent           silent operation
  -SIGNAL               send this signal instead of SIGKILL
  -u,--user             display user IDs
  -v,--verbose          verbose output
  -w,--writeonly        kill only processes with write access
  -V,--version          display version information
  -4,--ipv4             search IPv4 sockets only
  -6,--ipv6             search IPv6 sockets only
  -                     reset options
  udp/tcp names: [local_port][,[rmt_host][,[rmt_port]]]

 

[sfx2000]

If the other hints didn't work - try this...

Gotta be r00t here...

 

[Xentrk]

This is interesting. I was able to run e2fsck on /dev/sdc1. It was the sftp-server process that had it locked up. I closed my sftp session and killed the pid. I was then able to successfully run e2fsck.

/dev/sdb1 is being used by dnsmasq. I have issued the kill -9 command to kill the process. But a new one always starts up. Anyone know how to stop that from happening? I am tempted to plug the USB into my pfSense appliance so I can run e2fsck on it. But only want to try that after I have exhausted all attempts of trying on the router.

admin@RT-AC88U-5248:/jffs/scripts# fuser -v -m /dev/sdb1
                     USER        PID ACCESS COMMAND
/dev/sdb1:           admin    kernel mount /tmp/mnt/absolution
                     nobody    26588 F.... dnsmasq

admin@RT-AC88U-5248:/jffs/scripts# fuser -v -m /dev/sdc1
                     USER        PID ACCESS COMMAND
/dev/sdc1:           admin    kernel mount /tmp/mnt/entware
                     admin      5991 ...e. sftp-server
                     nobody     6604 ....m pixelserv-tls
                     admin      6606 ....m pixelserv-tls
                     admin     22104 ...e. sftp-server

admin@RT-AC88U-5248:/jffs/scripts# ./services-stop
 Checking pixelserv-tls (AB-Solution)...              alive.
 Shutting down pixelserv-tls...              done.

admin@RT-AC88U-5248:/jffs/scripts# fuser -v -m /dev/sdb1
                     USER        PID ACCESS COMMAND
/dev/sdb1:           admin    kernel mount /tmp/mnt/absolution
                     nobody    26588 F.... dnsmasq

admin@RT-AC88U-5248:/jffs/scripts# fuser -v -m /dev/sdc1
                     USER        PID ACCESS COMMAND
/dev/sdc1:           admin    kernel mount /tmp/mnt/entware
                     admin      5991 ...e. sftp-server
                     admin     22104 ...e. sftp-server

admin@RT-AC88U-5248:/jffs/scripts# kill -9 26588

admin@RT-AC88U-5248:/jffs/scripts# kill -9 5991

admin@RT-AC88U-5248:/jffs/scripts# fuser -v -m /dev/sdb1
                     USER        PID ACCESS COMMAND
/dev/sdb1:           admin    kernel mount /tmp/mnt/absolution
                     nobody    27791 F.... dnsmasq

admin@RT-AC88U-5248:/jffs/scripts# fuser -v -m /dev/sdc1
                     USER        PID ACCESS COMMAND
/dev/sdc1:           admin    kernel mount /tmp/mnt/entware

admin@RT-AC88U-5248:/jffs/scripts# kill -9 27791

admin@RT-AC88U-5248:/jffs/scripts# e2fsck -y -f /dev/sdc1
e2fsck 1.42.13 (17-May-2015)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Free blocks count wrong for group #243 (65268, counted=7924).
Fix? yes

Free blocks count wrong (1979659, counted=1922315).
Fix? yes
entware: ***** FILE SYSTEM WAS MODIFIED *****
entware: 448/499712 files (2.7% non-contiguous), 76533/1998848 blocks

admin@RT-AC88U-5248:/jffs/scripts# fuser -v -m /dev/sdb1
                     USER        PID ACCESS COMMAND
/dev/sdb1:           nobody    28062 F.... dnsmasq

 

[Xentrk]

I got the e2fsck command to work for sdb1. Fuser has a –k option which will send a signal to each process using the mount. Upon first attempt at using this option, it appeared to be successful. But when I ran e2fsck again, I got the “in use” message. On second attempt, I added the –i option. I got no errors in return. I then reran fuser with –v –m options and dnsmasq shows up again. I killed the PID, then reran fuser –v –m and no processes showed as using the disk. I then was able to rerun e2fsck successfully! In prior attempts, another dnsmasq always spawned up again, which prevented me from running e2fsck.

admin@RT-AC88U-5248:/jffs/scripts# fuser -v -k /dev/sdb1
admin@RT-AC88U-5248:/jffs/scripts# e2fsck -y -v -f /dev/sdb1
e2fsck 1.42.13 (17-May-2015)
/dev/sdb1 is in use.
e2fsck: Cannot continue, aborting.

admin@RT-AC88U-5248:/jffs/scripts# fuser -v -m /dev/sdb1
                     USER        PID ACCESS COMMAND
/dev/sdb1:           nobody    28062 F.... dnsmasq

admin@RT-AC88U-5248:/jffs/scripts# fuser -v -k -i /dev/sdb1
admin@RT-AC88U-5248:/jffs/scripts# fuser -v -m /dev/sdb1
                     USER        PID ACCESS COMMAND
/dev/sdb1:           nobody    28062 F.... dnsmasq

admin@RT-AC88U-5248:/jffs/scripts# kill -9 28062
admin@RT-AC88U-5248:/jffs/scripts# fuser -v -m /dev/sdb1
admin@RT-AC88U-5248:/jffs/scripts# e2fsck -y -v -f /dev/sdb1
e2fsck 1.42.13 (17-May-2015)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
          58 inodes used (0.01%, out of 976896)
           8 non-contiguous files (13.8%)
           1 non-contiguous directory (1.7%)
             # of inodes with ind/dind/tind blocks: 22/12/0
      229895 blocks used (5.89%, out of 3902464)
           0 bad blocks
           0 large files
          39 regular files
          10 directories
           0 character device files
           0 block device files
           0 fifos
           0 links
           0 symbolic links (0 fast symbolic links)
           0 sockets
------------
          49 files

Thank you!! I am very GRATEFUL for all of the help!

 

[thelonelycoder]

In prior attempts, another dnsmasq always spawned up again, which prevented me from running e2fsck.

Disable logging and ad-blocking, then exit AB, this prevents dnsmasq from writing to the device. Pixelserv-tls is also stopped if ad-blocking is off.

 

[Xentrk]

Disable logging and ad-blocking, then exit AB, this prevents dnsmasq from writing to the device. Pixelserv-tls is also stopped if ad-blocking is off.

Thanks. That helps explain what was going on. I had only run the services-stop script. Now I know what to do differently next time. But I learned about "fuser" in the process so that was good.