[dm-crypt] cryptsetup luksOpen hang on semop

Arno Wagner arno at wagner.name
Tue Jun 9 07:59:05 CEST 2015

On Tue, Jun 09, 2015 at 07:37:12 CEST, Milan Broz wrote:
> On 06/09/2015 03:15 AM, laxmikanth reddy wrote:
> > 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.
> Maybe you should start with reading FAQ and archive, similar problem was here
> just few weeks ago, please read this thread
> http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/8049

FAQ is here:

Mailing List archive is given in FAQ ite, 1.7

Without having time to look at the defaults of your issue, usually
these lockups are causes by the other side having problems (as 
Milan explains below). Automagic is nice when it works, but a pain
to debug when it does not.

Note that udev/LVM2 is not part of the cryptsetup project.


> I think your system is just compiled with udev support but missing mandatory
> device mapper udev rules (libdevmapper library and udev rules are part of 
> lvm2 package, cryptsetup depends on it).
> Also please use new version (1.6.7) there were some bugfixes, 1.6.1 is pretty old version.
> > 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
> Please better always paste --debug log (which is sanitized), we need strace only
> if requested (see FAQ).
> Milan
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Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
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