[dm-crypt] cryptsetup luksOpen hang on semop

[laxmikanth reddy <plkreddy2000@yahoo.com>]

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Hi Team,
Wee are working embedded system bringup with custom build kernel 3.10.65 version. 
and kernel version is 3.10.65.
Here, we are trying to mount the encrypted disk, when udev rule match the uevent,
with "cryptsetup luksOpen ..", and it is getting hang at semop. cryptsetup 1.6.1.Can you please share light on, what could be the possible reasons for this issue? 
Appriciate your help and any pointers, to debug this issue. Thanks in advance. 
Foloowing is the starce log, for "cryptsetup luksOpen ..":
bash-4.2# strace /sbin/cryptsetup --debug --batch-mode luksOpen /dev/bootdisk2>
execve("/sbin/cryptsetup", ["/sbin/cryptsetup", "--debug", "--batch-mode", "luksOpen", "/dev/bootdisk2", "NVRAM", "--key-file", "/varied/nv_bb"], [/* 12 vars */]) = 0......open("/dev/bootdisk2", O_RDONLY|O_LARGEFILE) = 6
fstat64(6, {st_mode=S_IFBLK|0640, st_rdev=makedev(8, 2), ...}) = 0
ioctl(6, BLKSSZGET, 512)                = 0
close(6)                                = 0stat64("/dev/bootdisk2", {st_mode=S_IFBLK|0640, st_rdev=makedev(8, 2), ...}) = 0
open("/dev/bootdisk2", O_RDWR|O_LARGEFILE) = 6
ioctl(6, BLKROGET, 0)                   = 0
ioctl(6, BLKGETSIZE64, 35651584)        = 0
close(6)                                = 0
open("/dev/urandom", O_RDONLY|O_LARGEFILE) = 6
read(6, "\265\376", 2)                  = 2
semget(0xd4dfeb5, 1, IPC_CREAT|IPC_EXCL|0600) = 163845
semctl(163845, 0, IPC_64|SETVAL, 0xffb176c8) = 0
semctl(163845, 0, IPC_64|GETVAL, 0xffb176c8) = 1
close(6)                                = 0
semop(163845, {{0, 1, 0}}, 1)           = 0
semctl(163845, 0, IPC_64|GETVAL, 0xffb17728) = 2
open("/dev/bootdisk2", O_RDONLY|O_LARGEFILE) = 6
ioctl(6, BLKRAGET, 256)                 = 0
close(6)                                = 0
ioctl(5, DM_DEV_CREATE, 0x885a2a8)      = 0
ioctl(5, DM_TABLE_LOAD, 0x885a2a8)      = 0
ioctl(5, DM_DEV_SUSPEND, 0x885a2a8)     = 0
semget(0xd4dfeb5, 1, 0)                 = 163845
semctl(163845, 0, IPC_64|GETVAL, 0xffb176f8) = 2
semop(163845, {{0, -1, IPC_NOWAIT}}, 1) = 0
semop(163845, {{0, 0, 0}}, 1                             >>>>>>>>system hangs on this semop
Thanks
Laxmikanth


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