There are some strange errors showing up in my dmesg output related to mounting sda4 on boot, which is an extended partition containing used logical volumes.
The following is an extract of my dmesg output shortly after boot. I removed some [UFW BLOCK] firewall entries in between it though.
[ 842.165660] SGI XFS with ACLs, security attributes, realtime, no debug enabled
[ 842.372589] JFS: nTxBlock = 8192, nTxLock = 65536
[ 842.668365] ntfs: driver 2.1.32 [Flags: R/O MODULE].
[ 843.035074] QNX4 filesystem 0.2.3 registered.
[ 843.288031] raid6: sse2x1 gen() 2212 MB/s
[ 843.356052] raid6: sse2x1 xor() 1599 MB/s
[ 843.424044] raid6: sse2x2 gen() 3118 MB/s
[ 843.492027] raid6: sse2x2 xor() 1502 MB/s
[ 843.560047] raid6: sse2x4 gen() 2975 MB/s
[ 843.628024] raid6: sse2x4 xor() 1857 MB/s
[ 843.628034] raid6: using algorithm sse2x2 gen() 3118 MB/s
[ 843.628037] raid6: .... xor() 1502 MB/s, rmw enabled
[ 843.628041] raid6: using intx1 recovery algorithm
[ 843.660527] xor: measuring software checksum speed
[ 843.700031] prefetch64-sse: 3182.000 MB/sec
[ 843.740020] generic_sse: 3851.000 MB/sec
[ 843.740028] xor: using function: generic_sse (3851.000 MB/sec)
[ 843.869982] Btrfs loaded
[ 845.893662] EXT4-fs (sda4): unable to read superblock
[ 845.896625] EXT4-fs (sda4): unable to read superblock
[ 845.900337] EXT4-fs (sda4): unable to read superblock
[ 845.903455] FAT-fs (sda4): invalid media value (0xda)
[ 845.903464] FAT-fs (sda4): Can't find a valid FAT filesystem
[ 845.912432] XFS (sda4): Invalid superblock magic number
[ 845.919404] FAT-fs (sda4): invalid media value (0xda)
[ 845.919413] FAT-fs (sda4): Can't find a valid FAT filesystem
[ 845.927924] MINIX-fs: unable to read superblock
[ 846.001284] attempt to access beyond end of device
[ 846.001293] sda4: rw=16, want=3, limit=2
[ 846.001300] hfsplus: unable to find HFS+ superblock
[ 846.014902] qnx4: no qnx4 filesystem (no root dir).
[ 846.018195] ufs: You didn't specify the type of your ufs filesystem
mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
>>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
[ 846.024054] hfs: can't find a HFS filesystem on dev sda4
[ 890.554489] EXT4-fs (sda4): unable to read superblock
[ 890.557377] EXT4-fs (sda4): unable to read superblock
[ 890.560315] EXT4-fs (sda4): unable to read superblock
[ 890.563428] FAT-fs (sda4): invalid media value (0xda)
[ 890.563436] FAT-fs (sda4): Can't find a valid FAT filesystem
[ 890.573590] XFS (sda4): Invalid superblock magic number
[ 890.579829] FAT-fs (sda4): invalid media value (0xda)
[ 890.579838] FAT-fs (sda4): Can't find a valid FAT filesystem
[ 890.591160] MINIX-fs: unable to read superblock
[ 890.596813] attempt to access beyond end of device
[ 890.596837] sda4: rw=16, want=3, limit=2
[ 890.596876] hfsplus: unable to find HFS+ superblock
[ 890.601952] qnx4: no qnx4 filesystem (no root dir).
[ 890.607635] ufs: You didn't specify the type of your ufs filesystem
mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
>>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
[ 890.613446] hfs: can't find a HFS filesystem on dev sda4
[ 2111.590730] perf interrupt took too long (2505 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[ 2323.551898] EXT4-fs (sda4): unable to read superblock
[ 2323.555029] EXT4-fs (sda4): unable to read superblock
[ 2323.558560] EXT4-fs (sda4): unable to read superblock
[ 2323.561654] FAT-fs (sda4): invalid media value (0xda)
[ 2323.561662] FAT-fs (sda4): Can't find a valid FAT filesystem
[ 2323.570667] XFS (sda4): Invalid superblock magic number
[ 2323.577885] FAT-fs (sda4): invalid media value (0xda)
[ 2323.577893] FAT-fs (sda4): Can't find a valid FAT filesystem
[ 2323.588531] MINIX-fs: unable to read superblock
[ 2323.594927] attempt to access beyond end of device
[ 2323.594937] sda4: rw=16, want=3, limit=2
[ 2323.594943] hfsplus: unable to find HFS+ superblock
[ 2323.599796] qnx4: no qnx4 filesystem (no root dir).
[ 2323.603466] ufs: You didn't specify the type of your ufs filesystem
mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
>>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
[ 2323.627446] hfs: can't find a HFS filesystem on dev sda4
[ 2347.927763] EXT4-fs (sda4): unable to read superblock
[ 2347.937927] EXT4-fs (sda4): unable to read superblock
[ 2347.943278] EXT4-fs (sda4): unable to read superblock
[ 2347.954206] FAT-fs (sda4): invalid media value (0xda)
[ 2347.954217] FAT-fs (sda4): Can't find a valid FAT filesystem
[ 2348.020480] XFS (sda4): Invalid superblock magic number
[ 2348.049075] FAT-fs (sda4): invalid media value (0xda)
[ 2348.049085] FAT-fs (sda4): Can't find a valid FAT filesystem
[ 2348.062423] MINIX-fs: unable to read superblock
[ 2348.066949] attempt to access beyond end of device
[ 2348.066959] sda4: rw=16, want=3, limit=2
[ 2348.066965] hfsplus: unable to find HFS+ superblock
[ 2348.071702] qnx4: no qnx4 filesystem (no root dir).
[ 2348.076214] ufs: You didn't specify the type of your ufs filesystem
mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
>>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
[ 2348.095021] hfs: can't find a HFS filesystem on dev sda4
Here some more information about my system (Ubuntu 15.10 64-bit) and partitions:
Output of lsblk /dev/sda:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 232,9G 0 disk
├─sda1 8:1 0 100M 0 part /win/boot
├─sda2 8:2 0 74G 0 part /win/c
├─sda3 8:3 0 8G 0 part /boot
├─sda4 8:4 0 1K 0 part
├─sda5 8:5 0 31,3G 0 part /images
├─sda6 8:6 0 40G 0 part /
├─sda7 8:7 0 60G 0 part /home
├─sda8 8:8 0 15G 0 part /win/share
└─sda9 8:9 0 4,6G 0 part [SWAP]
Output of sudo parted -l /dev/sda:
Model: ATA Hitachi HDS72102 (scsi)
Disk /dev/sda: 250GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 106MB 105MB primary ntfs boot
2 106MB 79,6GB 79,4GB primary ntfs
3 79,6GB 88,1GB 8590MB primary ext4
4 88,1GB 250GB 162GB extended
6 88,1GB 131GB 42,9GB logical ext4
7 131GB 196GB 64,4GB logical ext4
8 196GB 212GB 16,1GB logical fat32
9 212GB 217GB 4876MB logical linux-swap(v1)
5 217GB 250GB 33,6GB logical ext4
Output of mount | grep /dev/sda:
/dev/sda6 on / type ext4 (rw,relatime,errors=remount-ro,data=ordered)
/dev/sda1 on /win/boot type fuseblk (rw,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096)
/dev/sda2 on /win/c type fuseblk (rw,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096)
/dev/sda7 on /home type ext4 (rw,relatime,data=ordered)
/dev/sda5 on /images type ext4 (rw,relatime,data=ordered)
/dev/sda3 on /boot type ext4 (rw,relatime,data=ordered)
/dev/sda8 on /win/share type vfat (rw,relatime,gid=46,fmask=0007,dmask=0007,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro)
Content of /etc/fstab:
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda6 during installation
UUID=eee18451-b607-4875-8a88-c9cb6c6544c8 / ext4 errors=remount-ro 0 1
# /boot was on /dev/sda3 during installation
UUID=6dbb8633-dadd-4b5e-8d85-b0895fde9dfb /boot ext4 defaults 0 2
# /home was on /dev/sda7 during installation
UUID=485b3ef1-7216-4053-b25c-f656d529e8e6 /home ext4 defaults 0 2
# /images was on /dev/sda5 during installation
UUID=81dc42c4-a161-4ccd-b704-6e5c09298943 /images ext4 defaults 0 2
# /old partition image file of previous 15.04 installation
/images/backup/ubuntu-vivid-151028-ext4.img /old ext4 defaults,ro
# /win/boot was on /dev/sda1 during installation
UUID=90DCF3A5DCF3842E /win/boot ntfs defaults,umask=007,gid=46 0 0
# /win/c was on /dev/sda2 during installation
UUID=482C7A572C7A3FCC /win/c ntfs defaults,umask=007,gid=46 0 0
# /win/share was on /dev/sda8 during installation
UUID=B148-49F9 /win/share vfat utf8,umask=007,gid=46 0 1
# swap was on /dev/sda9 during installation
UUID=4b184fdc-fe7a-4019-92e4-8a6607fe7291 none swap sw 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0
