I think I got hit by this problem too.

Fedora 16
# e2fsck -V
e2fsck 1.41.14 (22-Dec-2010)
        Benutze EXT2FS Library version 1.41.14, 22-Dec-2010

The device is definitely not mounted.

However I can mount and use the device as usual. Just once I umount it
(and it is not listed any more on /proc/mounts), I can not run e2fsck on
it.

---------------------------------------------------------------------------------------

# tune2fs -l /dev/sdb1 
tune2fs 1.41.14 (22-Dec-2010)
Filesystem volume name:   win7
Last mounted on:          /media/win7
Filesystem UUID:          7617b06c-9916-47ca-96bf-3f9ddc6fc592
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      ext_attr resize_inode dir_index filetype sparse_super 
large_file
Filesystem flags:         signed_directory_hash 
Default mount options:    (none)
Filesystem state:         not clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              9898080
Block count:              39731200
Reserved block count:     1986560
Free blocks:              3582970
Free inodes:              9833445
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1014
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8160
Inode blocks per group:   510
Filesystem created:       Sun Jan  9 15:10:44 2011
Last mount time:          Sat Apr 28 15:54:11 2012
Last write time:          Sat Apr 28 15:55:08 2012
Mount count:              4
Maximum mount count:      28
Last checked:             Sat Apr 28 15:01:42 2012
Check interval:           15552000 (6 months)
Next check after:         Thu Oct 25 15:01:42 2012
Lifetime writes:          176 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Default directory hash:   half_md4
Directory Hash Seed:      233e63e3-27e2-4b33-987f-b932f2c81aa0

---------------------------------------------------------------------------------------

I can not guaranty that there are physical errors, but smartctl still says 
PASSED.
# smartctl -a /dev/sdb1 
smartctl 5.42 2011-10-20 r3458 [x86_64-linux-3.3.2-6.fc16.x86_64] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Model Family:     Seagate Barracuda LP
Device Model:     ST31500541AS
Serial Number:    9XW0ECDZ
LU WWN Device Id: 5 000c50 0206609c0
Firmware Version: CC34
User Capacity:    1.500.301.910.016 bytes [1,50 TB]
Sector Size:      512 bytes logical/physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   8
ATA Standard is:  ATA-8-ACS revision 4
Local Time is:    Sun Apr 29 01:19:47 2012 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00) Offline data collection activity
                                        was never started.
                                        Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0) The previous self-test routine completed
                                        without error or no self-test has ever 
                                        been run.
Total time to complete Offline 
data collection:                (  653) seconds.
Offline data collection
capabilities:                    (0x73) SMART execute Offline immediate.
                                        Auto Offline data collection on/off 
support.
                                        Suspend Offline collection upon new
                                        command.
                                        No Offline surface scan supported.
                                        Self-test supported.
                                        Conveyance Self-test supported.
                                        Selective Self-test supported.
SMART capabilities:            (0x0003) Saves SMART data before entering
                                        power-saving mode.
                                        Supports SMART auto save timer.
Error logging capability:        (0x01) Error logging supported.
                                        General Purpose Logging supported.
Short self-test routine 
recommended polling time:        (   1) minutes.
Extended self-test routine
recommended polling time:        ( 255) minutes.
Conveyance self-test routine
recommended polling time:        (   2) minutes.
SCT capabilities:              (0x103f) SCT Status supported.
                                        SCT Error Recovery Control supported.
                                        SCT Feature Control supported.
                                        SCT Data Table supported.

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  
WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000f   114   099   006    Pre-fail  Always       
-       77166356
  3 Spin_Up_Time            0x0003   100   100   000    Pre-fail  Always       
-       0
  4 Start_Stop_Count        0x0032   100   100   020    Old_age   Always       
-       759
  5 Reallocated_Sector_Ct   0x0033   100   100   036    Pre-fail  Always       
-       0
  7 Seek_Error_Rate         0x000f   072   060   030    Pre-fail  Always       
-       16025158
  9 Power_On_Hours          0x0032   096   096   000    Old_age   Always       
-       4312
 10 Spin_Retry_Count        0x0013   100   100   097    Pre-fail  Always       
-       0
 12 Power_Cycle_Count       0x0032   100   100   020    Old_age   Always       
-       743
183 Runtime_Bad_Block       0x0032   100   100   000    Old_age   Always       
-       0
184 End-to-End_Error        0x0032   100   100   099    Old_age   Always       
-       0
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       
-       0
188 Command_Timeout         0x0032   100   100   000    Old_age   Always       
-       0
189 High_Fly_Writes         0x003a   100   100   000    Old_age   Always       
-       0
190 Airflow_Temperature_Cel 0x0022   065   060   045    Old_age   Always       
-       35 (Min/Max 22/36)
194 Temperature_Celsius     0x0022   035   040   000    Old_age   Always       
-       35 (0 15 0 0 0)
195 Hardware_ECC_Recovered  0x001a   063   051   000    Old_age   Always       
-       77166356
197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always       
-       0
198 Offline_Uncorrectable   0x0010   100   100   000    Old_age   Offline      
-       0
199 UDMA_CRC_Error_Count    0x003e   200   200   000    Old_age   Always       
-       0
240 Head_Flying_Hours       0x0000   100   253   000    Old_age   Offline      
-       7997229111372
241 Total_LBAs_Written      0x0000   100   253   000    Old_age   Offline      
-       952022423
242 Total_LBAs_Read         0x0000   100   253   000    Old_age   Offline      
-       3219442744

SMART Error Log Version: 1
No Errors Logged

---------------------------------------------------------------------------------------

Here is what e2fsk does to me:
execve("/sbin/e2fsck", ["e2fsck", "-y", "/dev/sdb1"], [/* 30 vars */]) = 0
brk(0)                                  = 0x1f5b000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7ff787ec2000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=180423, ...}) = 0
mmap(NULL, 180423, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ff787e95000
close(3)                                = 0
open("/lib64/libext2fs.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, 
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\227\200\0218\0\0\0"..., 832) = 
832
fstat(3, {st_mode=S_IFREG|0755, st_size=198088, ...}) = 0
mmap(0x3811800000, 2291264, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 
0) = 0x3811800000
mprotect(0x381182e000, 2097152, PROT_NONE) = 0
mmap(0x3811a2e000, 8192, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2e000) = 0x3811a2e000
close(3)                                = 0
open("/lib64/libcom_err.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, 
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260\23\300\0318\0\0\0"..., 832) 
= 832
fstat(3, {st_mode=S_IFREG|0755, st_size=15104, ...}) = 0
mmap(0x3819c00000, 2107512, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 
0) = 0x3819c00000
mprotect(0x3819c03000, 2093056, PROT_NONE) = 0
mmap(0x3819e02000, 4096, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x3819e02000
close(3)                                = 0
open("/lib64/libblkid.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`g\200\0278\0\0\0"..., 
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=158296, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7ff787e94000
mmap(0x3817800000, 2250904, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 
0) = 0x3817800000
mprotect(0x3817823000, 2093056, PROT_NONE) = 0
mmap(0x3817a22000, 16384, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x22000) = 0x3817a22000
close(3)                                = 0
open("/lib64/libuuid.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, 
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\26\300\0258\0\0\0"..., 832) 
= 832
fstat(3, {st_mode=S_IFREG|0755, st_size=21688, ...}) = 0
mmap(0x3815c00000, 2113968, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 
0) = 0x3815c00000
mprotect(0x3815c04000, 2093056, PROT_NONE) = 0
mmap(0x3815e03000, 8192, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x3815e03000
close(3)                                = 0
open("/lib64/libe2p.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\35@\0228\0\0\0"..., 
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=31008, ...}) = 0
mmap(0x3812400000, 2124400, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 
0) = 0x3812400000
mprotect(0x3812406000, 2097152, PROT_NONE) = 0
mmap(0x3812606000, 4096, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x3812606000
close(3)                                = 0
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260\27B\0218\0\0\0"..., 
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2076800, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7ff787e93000
mmap(0x3811400000, 3896632, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 
0) = 0x3811400000
mprotect(0x38115ad000, 2097152, PROT_NONE) = 0
mmap(0x38117ad000, 24576, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1ad000) = 0x38117ad000
mmap(0x38117b3000, 17720, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x38117b3000
close(3)                                = 0
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320k\0\0228\0\0\0"..., 
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=145176, ...}) = 0
mmap(0x3812000000, 2208760, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 
0) = 0x3812000000
mprotect(0x3812017000, 2093056, PROT_NONE) = 0
mmap(0x3812216000, 8192, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x3812216000
mmap(0x3812218000, 13304, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3812218000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7ff787e92000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7ff787e90000
arch_prctl(ARCH_SET_FS, 0x7ff787e90780) = 0
mprotect(0x3817a22000, 12288, PROT_READ) = 0
mprotect(0x3815e03000, 4096, PROT_READ) = 0
mprotect(0x38117ad000, 16384, PROT_READ) = 0
mprotect(0x3812216000, 4096, PROT_READ) = 0
mprotect(0x3811221000, 4096, PROT_READ) = 0
munmap(0x7ff787e95000, 180423)          = 0
set_tid_address(0x7ff787e90a50)         = 24937
set_robust_list(0x7ff787e90a60, 0x18)   = 0
rt_sigaction(SIGRTMIN, {0x3812006720, [], SA_RESTORER|SA_SIGINFO, 
0x381200f500}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0x38120067b0, [], SA_RESTORER|SA_RESTART|SA_SIGINFO, 
0x381200f500}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
brk(0)                                  = 0x1f5b000
brk(0x1f7c000)                          = 0x1f7c000
brk(0)                                  = 0x1f7c000
open("/usr/lib/locale/locale-archive", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=104993360, ...}) = 0
mmap(NULL, 104993360, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ff781a6e000
close(3)                                = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 
{B38400 opost isig icanon echo ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 
0x7fffa8af8938) = -1 EINVAL (Invalid argument)
getuid()                                = 0
geteuid()                               = 0
getgid()                                = 0
getegid()                               = 0
prctl(PR_GET_DUMPABLE)                  = 1
getuid()                                = 0
geteuid()                               = 0
getgid()                                = 0
getegid()                               = 0
prctl(PR_GET_DUMPABLE)                  = 1
open("/etc/blkid.conf", O_RDONLY)       = -1 ENOENT (No such file or directory)
open("/etc/blkid/blkid.tab", O_RDONLY)  = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=1848, ...}) = 0
fcntl(3, F_GETFL)                       = 0x8000 (flags O_RDONLY|O_LARGEFILE)
fstat(3, {st_mode=S_IFREG|0644, st_size=1848, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7ff787ec1000
lseek(3, 0, SEEK_CUR)                   = 0
read(3, "<device DEVNO=\"0x0801\" TIME=\"133"..., 4096) = 1848
access("/dev/sda1", F_OK)               = 0
access("/dev/sda2", F_OK)               = 0
access("/dev/sda3", F_OK)               = 0
access("/dev/sda5", F_OK)               = 0
access("/dev/sda6", F_OK)               = 0
access("/dev/sdb5", F_OK)               = 0
access("/dev/sdb7", F_OK)               = 0
access("/dev/sdb6", F_OK)               = 0
access("/dev/sdb1", F_OK)               = 0
access("/dev/mapper/luks-3df32fb9-4422-4b90-b95b-1b96f681d883", F_OK) = 0
access("/dev/mapper/luks-b460f97b-e676-4b0b-a02f-dc04bd356556", F_OK) = 0
access("/dev/mapper/luks-2a6c1819-d710-4a1f-988e-ce2086e1a582", F_OK) = 0
access("/dev/sr0", F_OK)                = 0
access("/dev/sdb8", F_OK)               = 0
read(3, "", 4096)                       = 0
lseek(3, 1848, SEEK_SET)                = 1848
close(3)                                = 0
munmap(0x7ff787ec1000, 4096)            = 0
openat(AT_FDCWD, "/etc/e2fsck.conf", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) 
= -1 ENOENT (No such file or directory)
rt_sigaction(SIGINT, {0x407670, [], SA_RESTORER, 0x3811436300}, NULL, 8) = 0
rt_sigaction(SIGTERM, {0x407670, [], SA_RESTORER, 0x3811436300}, NULL, 8) = 0
rt_sigaction(SIGUSR1, {0x407650, [], SA_RESTORER|SA_RESTART, 0x3811436300}, 
NULL, 8) = 0
rt_sigaction(SIGUSR2, {0x408500, [], SA_RESTORER|SA_RESTART, 0x3811436300}, 
NULL, 8) = 0
open("/dev/null", O_RDWR)               = 3
close(3)                                = 0
brk(0)                                  = 0x1f7c000
getrusage(RUSAGE_SELF, {ru_utime={0, 1999}, ru_stime={0, 2999}, ...}) = 0
write(2, "e2fsck 1.41.14 (22-Dec-2010)\n", 29e2fsck 1.41.14 (22-Dec-2010)
) = 29
stat("/dev/sdb1", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 17), ...}) = 0
open("/proc/swaps", O_RDONLY)           = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7ff787ec1000
read(3, "Filename\t\t\t\tType\t\tSize\tUsed\tPrio"..., 1024) = 99
stat("/dev/dm-0", {st_mode=S_IFBLK|0660, st_rdev=makedev(253, 0), ...}) = 0
read(3, "", 1024)                       = 0
close(3)                                = 0
munmap(0x7ff787ec1000, 4096)            = 0
open("/proc/mounts", O_RDONLY)          = 3
stat("/dev/sdb1", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 17), ...}) = 0
futex(0x38117b4660, FUTEX_WAKE_PRIVATE, 2147483647) = 0
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7ff787ec1000
read(3, "rootfs / rootfs rw 0 0\nproc /pro"..., 1024) = 1024
stat("/dev/mapper/luks-3df32fb9-4422-4b90-b95b-1b96f681d883", 
{st_mode=S_IFBLK|0660, st_rdev=makedev(253, 1), ...}) = 0
read(3, "id,nodev,noexec,relatime,freezer"..., 1024) = 1024
read(3, "osuid,nodev,relatime,user_xattr,"..., 1024) = 335
stat("/dev/mapper/luks-2a6c1819-d710-4a1f-988e-ce2086e1a582", 
{st_mode=S_IFBLK|0660, st_rdev=makedev(253, 2), ...}) = 0
stat("/dev/sr0", {st_mode=S_IFBLK|0660, st_rdev=makedev(11, 0), ...}) = 0
read(3, "", 1024)                       = 0
stat("/", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
close(3)                                = 0
munmap(0x7ff787ec1000, 4096)            = 0
open("/etc/mtab", O_RDONLY)             = 3
stat("/dev/sdb1", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 17), ...}) = 0
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7ff787ec1000
read(3, "rootfs / rootfs rw 0 0\nproc /pro"..., 1024) = 1024
stat("/dev/mapper/luks-3df32fb9-4422-4b90-b95b-1b96f681d883", 
{st_mode=S_IFBLK|0660, st_rdev=makedev(253, 1), ...}) = 0
read(3, "id,nodev,noexec,relatime,freezer"..., 1024) = 1024
read(3, "osuid,nodev,relatime,user_xattr,"..., 1024) = 335
stat("/dev/mapper/luks-2a6c1819-d710-4a1f-988e-ce2086e1a582", 
{st_mode=S_IFBLK|0660, st_rdev=makedev(253, 2), ...}) = 0
stat("/dev/sr0", {st_mode=S_IFBLK|0660, st_rdev=makedev(11, 0), ...}) = 0
read(3, "", 1024)                       = 0
stat("/", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
close(3)                                = 0
munmap(0x7ff787ec1000, 4096)            = 0
stat("/dev/sdb1", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 17), ...}) = 0
open("/dev/sdb1", O_RDONLY|O_EXCL)      = -1 EBUSY (Device or resource busy)
open("/dev/sdb1", O_RDWR|O_EXCL)        = -1 EBUSY (Device or resource busy)
open("/usr/share/locale/locale.alias", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2512, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x7ff787ec1000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2512
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x7ff787ec1000, 4096)            = 0
open("/usr/share/locale/de_DE.utf8/LC_MESSAGES/e2fsprogs.mo", O_RDONLY) = -1 
ENOENT (No such file or directory)
open("/usr/share/locale/de_DE/LC_MESSAGES/e2fsprogs.mo", O_RDONLY) = -1 ENOENT 
(No such file or directory)
open("/usr/share/locale/de.utf8/LC_MESSAGES/e2fsprogs.mo", O_RDONLY) = -1 
ENOENT (No such file or directory)
open("/usr/share/locale/de/LC_MESSAGES/e2fsprogs.mo", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=101232, ...}) = 0
mmap(NULL, 101232, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ff787ea9000
close(3)                                = 0
open("/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=26244, ...}) = 0
mmap(NULL, 26244, PROT_READ, MAP_SHARED, 3, 0) = 0x7ff787ea2000
close(3)                                = 0
futex(0x38117b2af0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
write(2, "e2fsck", 6e2fsck)                   = 6
write(2, ": ", 2: )                       = 2
open("/usr/share/locale/de_DE.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT 
(No such file or directory)
open("/usr/share/locale/de_DE/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No 
such file or directory)
open("/usr/share/locale/de.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No 
such file or directory)
open("/usr/share/locale/de/LC_MESSAGES/libc.mo", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=123193, ...}) = 0
mmap(NULL, 123193, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ff781a4f000
close(3)                                = 0
write(2, "Das Ger\303\244t oder die Ressource is"..., 40Das Gerät oder die 
Ressource ist belegt) = 40
write(2, " ", 1 )                        = 1
write(2, "beim Versuch, /dev/sdb1 zu \303\266ffn"..., 34beim Versuch, /dev/sdb1 
zu öffnen) = 34
ioctl(2, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 
0x7fffa8af88c8) = -1 EINVAL (Invalid argument)
write(2, "\n", 1
)                       = 1
write(1, "Ist das Dateisystem eingeh\303\244ngt "..., 90Ist das Dateisystem 
eingehängt or exklusiv von einem anderen Programm

geöffnet worden?
) = 90
exit_group(8)                           = ?

** Attachment added: "e2image -r /dev/sdb1 - | bzip2 > /tmp/sdb1.e2i.bz2"
   
https://bugs.launchpad.net/ubuntu/+source/e2fsprogs/+bug/711799/+attachment/3113922/+files/sdb1.e2i.bz2

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https://bugs.launchpad.net/bugs/711799

Title:
  e2fsprogs wrongly identifies ext4 as mounted

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