Re: [gentoo-user] cryptsetup close and device in use when it is not

[Dale]

Dale wrote:
> Dale wrote:
>> Dale wrote:
>>> Jack wrote:
>>>> Is it possible it was still syncing cache out to the physical drive? 
>>>> I wonder if iotop would show any activity for that drive if that's the
>>>> case?
>>>>
>>>> Jack
>>>>
>>>>
>>>>
>>> I may try that next time but the light had stopped blinking for several
>>> minutes.  Since it is a SMR drive, I always leave it running until I
>>> can't feel the heads bumping around.  I don't think it would be that
>>> but, it's worth a try. It may lead to something. 
>>>
>>> Will update when it does it again. 
>>>
>>> Thanks.
>>>
>>> Dale
>>>
>>> :-)  :-) 
>>>
>> I had to wait until I was doing backups again to try anything.  The 6TB
>> drive did fine.  The 8TB drive is giving the in use error.  The drive is
>> unmounted but iotop didn't show anything and the light isn't blinking
>> either.  I'd think if it was flushing cache the light would flash and it
>> would not umount. 
>>
>> I tried the udev-trigger trick but it didn't work.  I don't know how
>> long it will stay 'in use' so if anyone has ideas, think and type fast. 
>> If not, may have to wait until next time to try again.
>>
>> Dale
>>
>> :-)  :-) 
>>
>
> Some more info:
>
>
> root@fireball / # lvs
>   LV     VG     Attr       LSize   Pool Origin Data%  Meta%  Move Log
> Cpy%Sync Convert
>   Home2  Home2  -wi-ao----
> <12.74t                                                   
>   swap   OS     -wi-ao---- 
> 12.00g                                                   
>   usr    OS     -wi-ao---- 
> 35.00g                                                   
>   var    OS     -wi-ao---- 
> 52.00g                                                   
>   backup backup -wi-ao----
> 698.63g                                                   
> root@fireball / # vgs
>   VG     #PV #LV #SN Attr   VSize    VFree 
>   Home2    2   1   0 wz--n-  <12.74t      0
>   OS       1   3   0 wz--n- <124.46g <25.46g
>   backup   1   1   0 wz--n-  698.63g      0
> root@fireball / # pvs
>   PV         VG     Fmt  Attr PSize    PFree 
>   /dev/sda7  OS     lvm2 a--  <124.46g <25.46g
>   /dev/sdb1  Home2  lvm2 a--    <5.46t      0
>   /dev/sdc1  Home2  lvm2 a--    <7.28t      0
>   /dev/sdd1  backup lvm2 a--   698.63g      0
> root@fireball / # cryptsetup close 8tb
> Device 8tb is still in use.
> root@fireball / #
>
>
> As you can see, lvm doesn't even show the device but it is still under
> /dev as tho it is available.  Weird. 
>
> I found this but at the end, the command doesn't help me.  I'm not sure
> why.  It does talk about using LUKS on top of LVM causing this problem. 
> Since the fix doesn't work, is this a different problem??
>
>
> https://linux-blog.anracom.com/tag/device-still-in-use/
>
>
> I've tried every command I can find and it still shows busy.  I even
> restarted udev and lvm.  Still busy. 
>
> Ideas?
>
> Dale
>
> :-)  :-) 
>


Found another tidbit of info that may shed some light on this problem. 
I'm not sure what it means tho.



root@fireball / # lsblk
NAME              MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
<<<SNIP>>>
sdj                 8:144  1   7.3T  0 disk 
└─sdj1              8:145  1   7.3T  0 part 
  └─8tb           254:5    0   7.3T  0 crypt /mnt/8tb
sr0                11:0    1  1024M  0 rom  
root@fireball / #


So, something called crypt seems to have it open.  Now how do I tell it
to go away?  Hmmmm.  Then I came up with this idea:


root@fireball / # ps aux | grep crypt
root       493  0.0  0.0      0     0 ?        I<   Jun13   0:00 [cryptd]
root     11509  0.0  0.0   7728  2448 pts/2    S+   00:30   0:00 grep
--colour=auto crypt
root     23667  0.0  0.0      0     0 ?        I<   Jun20   0:00
[kcryptd_io/254:]
root     23668  0.0  0.0      0     0 ?        I<   Jun20   0:00
[kcryptd/254:5]
root     23669  0.0  0.0      0     0 ?        S    Jun20   0:00
[dmcrypt_write/2]
root@fireball / #


So kcryptd is the offender it seems since it matches MAJ:MIN info.  I
assume that is kernel related not KDE.  Can I just kill that process? 
Will it do damage if I kill it or is there a better way? 

Dale

:-)  :-)