arch-chroot : duplicate mounts after mounting a folder with --bind option

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I'm chrooting in an arch systeml calling :



sudo arch-chroot -u ctag:ctag .


After this call I can see mounts created by arch_chroot :



38,56d37
< /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
< proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
< proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
< sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
< sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
< efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
< efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
< udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
< udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
< devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
< devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
< shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
< shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
< run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
< run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
< tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
< tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
< /dev/nvme0n1p4 on /home/remi/dev_tools/ti/ccs/ccs_root/etc/resolv.conf type ext4 (rw,relatime,data=ordered)
< /dev/nvme0n1p4 on /home/remi/dev_tools/ti/ccs/ccs_root/etc/resolv.conf type ext4 (rw,relatime,data=ordered)


Why are proc and other mounted twice?



I did an another test, before chrooting I did a bind mount :



sudo mount --bind /home/remi /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/


I chrooted and here are mounts points : 



37a38,76
> /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi type ext4 (rw,relatime,data=ordered)
> /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
> /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
> proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
> proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
> proc on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
> proc on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
> sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
> sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
> sys on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
> sys on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
> efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
> efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
> efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
> efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
> udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
> udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
> udev on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
> udev on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
> devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
> devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
> devpts on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
> devpts on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
> shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
> shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
> shm on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
> shm on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
> run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
> run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
> run on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
> run on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
> tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
> tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
> tmp on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
> tmp on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)


There is still duplicate mounts, but some other mounts to previously mounted /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/



How can we explain that?



After exiting chroot, these mounts points are unmounted.




arch-linux chroot




share|improve this question
























    up vote
    0
    down vote

    favorite












    I'm chrooting in an arch systeml calling :



    sudo arch-chroot -u ctag:ctag .


    After this call I can see mounts created by arch_chroot :



    38,56d37
    < /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
    < proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
    < proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
    < sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
    < sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
    < efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
    < efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
    < udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
    < udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
    < devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    < devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    < shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
    < shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
    < run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
    < run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
    < tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
    < tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
    < /dev/nvme0n1p4 on /home/remi/dev_tools/ti/ccs/ccs_root/etc/resolv.conf type ext4 (rw,relatime,data=ordered)
    < /dev/nvme0n1p4 on /home/remi/dev_tools/ti/ccs/ccs_root/etc/resolv.conf type ext4 (rw,relatime,data=ordered)


    Why are proc and other mounted twice?



    I did an another test, before chrooting I did a bind mount :



    sudo mount --bind /home/remi /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/


    I chrooted and here are mounts points : 



    37a38,76
    > /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi type ext4 (rw,relatime,data=ordered)
    > /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
    > /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
    > proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
    > proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
    > proc on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
    > proc on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
    > sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
    > sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
    > sys on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
    > sys on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
    > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
    > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
    > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
    > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
    > udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
    > udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
    > udev on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
    > udev on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
    > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    > shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
    > shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
    > shm on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
    > shm on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
    > run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
    > run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
    > run on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
    > run on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
    > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
    > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
    > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
    > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)


    There is still duplicate mounts, but some other mounts to previously mounted /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/



    How can we explain that?



    After exiting chroot, these mounts points are unmounted.




    arch-linux chroot




    share|improve this question






















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I'm chrooting in an arch systeml calling :



      sudo arch-chroot -u ctag:ctag .


      After this call I can see mounts created by arch_chroot :



      38,56d37
      < /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
      < proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      < proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      < sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      < sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      < efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      < efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      < udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      < udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      < devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      < devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      < shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      < shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      < run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      < run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      < tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
      < tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
      < /dev/nvme0n1p4 on /home/remi/dev_tools/ti/ccs/ccs_root/etc/resolv.conf type ext4 (rw,relatime,data=ordered)
      < /dev/nvme0n1p4 on /home/remi/dev_tools/ti/ccs/ccs_root/etc/resolv.conf type ext4 (rw,relatime,data=ordered)


      Why are proc and other mounted twice?



      I did an another test, before chrooting I did a bind mount :



      sudo mount --bind /home/remi /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/


      I chrooted and here are mounts points : 



      37a38,76
      > /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi type ext4 (rw,relatime,data=ordered)
      > /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
      > /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
      > proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      > proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      > proc on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      > proc on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      > sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      > sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      > sys on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      > sys on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      > udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      > udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      > udev on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      > udev on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      > shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      > shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      > shm on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      > shm on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      > run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      > run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      > run on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      > run on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
      > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
      > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
      > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)


      There is still duplicate mounts, but some other mounts to previously mounted /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/



      How can we explain that?



      After exiting chroot, these mounts points are unmounted.




      arch-linux chroot




      share|improve this question












      I'm chrooting in an arch systeml calling :



      sudo arch-chroot -u ctag:ctag .


      After this call I can see mounts created by arch_chroot :



      38,56d37
      < /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
      < proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      < proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      < sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      < sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      < efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      < efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      < udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      < udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      < devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      < devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      < shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      < shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      < run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      < run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      < tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
      < tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
      < /dev/nvme0n1p4 on /home/remi/dev_tools/ti/ccs/ccs_root/etc/resolv.conf type ext4 (rw,relatime,data=ordered)
      < /dev/nvme0n1p4 on /home/remi/dev_tools/ti/ccs/ccs_root/etc/resolv.conf type ext4 (rw,relatime,data=ordered)


      Why are proc and other mounted twice?



      I did an another test, before chrooting I did a bind mount :



      sudo mount --bind /home/remi /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/


      I chrooted and here are mounts points : 



      37a38,76
      > /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi type ext4 (rw,relatime,data=ordered)
      > /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
      > /dev/nvme0n1p6 on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root type ext4 (rw,relatime,data=ordered)
      > proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      > proc on /home/remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      > proc on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      > proc on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/proc type proc (rw,nosuid,nodev,noexec,relatime)
      > sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      > sys on /home/remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      > sys on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      > sys on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys type sysfs (ro,nosuid,nodev,noexec,relatime)
      > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      > efivarfs on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
      > udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      > udev on /home/remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      > udev on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      > udev on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev type devtmpfs (rw,nosuid,relatime,size=16392576k,nr_inodes=4098144,mode=755)
      > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      > devpts on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
      > shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      > shm on /home/remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      > shm on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      > shm on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/dev/shm type tmpfs (rw,nosuid,nodev,relatime)
      > run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      > run on /home/remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      > run on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      > run on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
      > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
      > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
      > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)
      > tmp on /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/tmp type tmpfs (rw,nosuid,nodev)


      There is still duplicate mounts, but some other mounts to previously mounted /home/remi/dev_tools/ti/ccs/ccs_root/home/ctag/host_files_remi/dev_tools/ti/ccs/ccs_root/



      How can we explain that?



      After exiting chroot, these mounts points are unmounted.





      arch-linux chroot





      share|improve this question











      share|improve this question




      share|improve this question










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