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From: Dale <rdalek1967@gmail.com>
To: Gentoo User <gentoo-user@lists.gentoo.org>
Subject: Re: [gentoo-user] cryptsetup close and device in use when it is not
Date: Sun, 19 Sep 2021 06:55:20 -0500	[thread overview]
Message-ID: <f51492b9-873c-0533-f818-3efe73fc42b2@gmail.com> (raw)
In-Reply-To: <AM6PR10MB2440A2245501F594C7EA4443EFF69@AM6PR10MB2440.EURPRD10.PROD.OUTLOOK.COM>

Ramon Fischer wrote:
> Hi Dale,
>
>>   So, something says it is busy but eventually
>> releases it if left alone for a while.  I'd like to know what it is and
>> if it is really in use or not.  Thing is, I can't find a way to know
>> what it is that is using it.  The dmsetup command shows it is in use but
>> no way to know what is using it.
> I could reproduce this issue by killing my desktop process, unmounting
> the home partition and playing some "kill process" bingo. I could
> backtrace it to one unkillable process "kcryptd":
>
>    1. Kill "awesomewm": <CTRL + ALT> + Backspace
>    2. Kill other processes accessing "/home/"
>    3. umount /home
>    4. cryptsetup close crypthome
>    Device crypthome is still in use
>    5. dmsetup info /dev/mapper/crypthome
>    Name:              crypthome
>    State:             ACTIVE
>    Read Ahead:        256
>    Tables present:    LIVE
>    Open count:        1
>    Event number:      0
>    Major, minor:      253, 1
>    Number of targets: 1
>    UUID: CRYPT-LUKS2-<some_uuid>-crypthome
>    6. Kill any unnecessary process and try "cryptsetup close crypthome"
>    7. Search for major, minor: ps aux | grep "253:1"
>    root       150  0.2  0.0      0     0 ?        I    15:21   0:02
>    [kworker/u16:5-kcryptd/253:1]
>    8. Does not work: kill 150
>    9. Does not work and could be dangerous: kill -9 150
>
> So, there was still one "kcryptd" process left, accessing the hard
> drive, but I found no way to kill it.
>
> Maybe this could be helpful?
>
> -Ramon
>


Well, it still does it but there is no rhyme or reason to when it says
in use and when it closes when asked too.  I to saw a process kcryptd
but not sure what triggers it. I didn't try to kill it since I'm pretty
sure it is a kernel process.  I build everything into my kernel, no
modules.  Sort of scared to mess with it. 

So, sometimes it works as it should, sometimes not.  When it doesn't, if
I leave it alone for a while then try again, it works.  I also checked
to be sure SMART wasn't doing something but if it is, I couldn't see
it.  Since it is a removable drive, I don't have it set to do anything
either. 

I guess I'll just have to wait on it to finish whatever it is doing to
close it when it gets stubborn.  Maybe this is a bug, maybe it has a
really good reason for not closing.  Who knows.  :/

Thanks to all for the help.  We gave it a good try.

Dale

:-)  :-)


  reply	other threads:[~2021-09-19 11:55 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-14  4:50 [gentoo-user] cryptsetup close and device in use when it is not Dale
2021-06-15 13:48 ` Ramon Fischer
2021-06-15 14:21   ` Dale
2021-06-15 14:52     ` Jack
2021-06-15 15:26       ` Dale
2021-06-15 19:04         ` Ramon Fischer
2021-06-21  4:18         ` Dale
2021-06-21  4:49           ` Dale
2021-06-21  5:41             ` Dale
2021-06-21  5:59               ` Dale
2021-06-28  3:35                 ` Dale
2021-07-05  3:19                   ` Dale
2021-07-06 18:40                     ` Ramon Fischer
2021-07-06 19:43                       ` Dale
2021-07-07 14:48                       ` Dr Rainer Woitok
2021-07-07 18:08                         ` Dale
2021-07-08  8:20                           ` Ramon Fischer
2021-07-12  8:31                             ` Dale
2021-07-12 13:14                               ` Ramon Fischer
2021-08-02 13:33                                 ` Dale
2021-08-09 13:38                                   ` Ramon Fischer
2021-09-19 11:55                                     ` Dale [this message]
2021-07-25 20:29                           ` Frank Steinmetzger
2021-07-25 23:10                             ` Dale
2021-07-26 21:00                               ` Frank Steinmetzger
2021-07-26 22:48                                 ` Dale
2021-07-29 16:46                                 ` Wols Lists
2021-07-29 20:55                                   ` [gentoo-user] [OT] SMR drives (WAS: cryptsetup close and device in use when it is not) Frank Steinmetzger
2021-07-29 21:31                                     ` Frank Steinmetzger
2021-07-30 12:48                                       ` Frank Steinmetzger
2021-07-30  5:14                                     ` William Kenworthy
2021-07-30 14:29                                       ` Rich Freeman
2021-07-30 16:50                                         ` antlists
2021-07-30 18:38                                           ` Rich Freeman
2021-07-31  3:14                                         ` William Kenworthy
2021-07-31  3:50                                           ` Wols Lists
2021-07-31  4:58                                             ` William Kenworthy
2021-07-31 12:12                                               ` Rich Freeman
2021-08-01  0:41                                                 ` Frank Steinmetzger
2021-08-01  0:56                                                   ` Rich Freeman
2021-07-31 16:38                                               ` antlists
2021-08-01  0:50                                               ` Frank Steinmetzger
2021-08-01  3:36                                                 ` William Kenworthy
2021-08-01  3:46                                                   ` William Kenworthy
2021-08-01 21:38                                                     ` Frank Steinmetzger
2021-08-02  5:38                                                       ` William Kenworthy
2021-08-02 21:52                                                         ` Frank Steinmetzger
2021-08-02 23:10                                                           ` William Kenworthy
2021-08-03  8:18                                                             ` Frank Steinmetzger
2021-08-05 20:40                                                               ` Frank Steinmetzger
2021-08-06  7:22                                                                 ` William Kenworthy
2021-08-01 21:55                                                   ` Frank Steinmetzger
2021-08-02  6:12                                                     ` William Kenworthy
2021-08-02 22:03                                                       ` Frank Steinmetzger
2021-08-02 23:35                                                         ` William Kenworthy
2021-08-01  3:41                                                 ` William Kenworthy
2021-08-01 21:41                                                   ` Frank Steinmetzger
2021-07-31 12:21                                             ` Rich Freeman
2021-07-31 12:59                                               ` William Kenworthy
2021-07-31 13:30                                                 ` Rich Freeman
2021-08-01  3:05                                                   ` William Kenworthy
2021-08-01 11:37                                                     ` Rich Freeman
2021-07-31  5:23                                           ` William Kenworthy
2021-06-15 17:48     ` [gentoo-user] Re: cryptsetup close and device in use when it is not Remy Blank

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