[dm-crypt] dmsetup or cryptsetup hangs in the initrd

Arno Wagner arno at wagner.name
Mon Oct 19 08:21:22 CEST 2015

First, we are not your debugging service. I do offer 
professional security consulting which includes this 
type of engineering, and it runs $250/hour and you have 
to order at least a day.
That said, you can narrow down "it hangs" by running 
cryptsetup with strace. Do not use a secret password 
for that as it will show up in the trace data. The last 
operation you see is the one that hangs. If it is still 
unclear to you what the problem is, post the trace here
(but remember the bit about the non-secret password!).


On Sat, Oct 17, 2015 at 16:24:13 CEST, Sean MacLennan wrote:
> In RedHat 7 I am trying to setup a partition with dmsetup. I have attached
> a tarball that includes three files:
> * go.sh is a simple script to install everything
> * install is the dracut module install
> * 95dmcrypt.sh is the file I want to run at boot time
> All the files are small, I can send them inline if preferred.
> Obviously, this has all been stripped down to make it as simple as
> possible. Sorry for the hard coding. If you want to test it, you need to
> provide a /dev/sdb1 partition that is at least 2G. If you comment out the
> `exit 0' in go.sh it will setup the partition for you.
> Note that if 95dmcrypt.sh has either the dmsetup or the 2 cryptsetup lines
> commented in, it will hang the machine.
> I am hoping I have just put something in the wrong place. pre-mount is
> where we previously ran the script from. Note that we have dmsetup working
> under RedHat 6.
> Cheers,
>     Sean

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Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
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