> For hours? Does it succeed after X number of hours?
Still mounted from Feb 6. There is an attempt to unmount every 10 minutes.
> This doesn't say that /dev/rbd0 is in use by pid 5926. It says that
> there is a process with the name "dio/rbd0", that's all.
>
> I'm guessing you ran plain "lsof" with no arguments here. Were there
> other */rbd0 matches, like jbd2/rbd0?
The entire output
:~# lsof | grep rbd
dio/rbd0 5926 root cwd DIR 8,5
4096 2 /
dio/rbd0 5926 root rtd DIR 8,5
4096 2 /
dio/rbd0 5926 root txt unknown
/proc/5926/exe
rbd 5996 root cwd DIR 8,5
4096 2 /
rbd 5996 root rtd DIR 8,5
4096 2 /
rbd 5996 root txt unknown
/proc/5996/exe
On Sun, Feb 5, 2017 at 4:26 AM, Ilya Dryomov <idryomov@xxxxxxxxx> wrote:
> On Sat, Feb 4, 2017 at 12:20 AM, Max Yehorov <myehorov@xxxxxxxxxx> wrote:
>> It is certainly annoying. It does not allow to umount for hours.
>
> For hours? Does it succeed after X number of hours?
>
>>> Does umount error out or hang forever?
>> umount errors out. with
>> umount: target is busy
>> (In some cases useful info about processes that
>> use the device is found by lsof(8) or fuser(1).)
>>
>> Maybe this will help?
>>
>> - lsof, for the rbd device in question, shows it is in use by pid 5926
>>
>> dio/rbd0 5926 root cwd DIR 8,5 4096 2 /
>> dio/rbd0 5926 root rtd DIR 8,5 4096 2 /
>> dio/rbd0 5926 root txt unknown /proc/5926/exe
>
> This doesn't say that /dev/rbd0 is in use by pid 5926. It says that
> there is a process with the name "dio/rbd0", that's all.
>
> I'm guessing you ran plain "lsof" with no arguments here. Were there
> other */rbd0 matches, like jbd2/rbd0?
>
>>
>> - PID 5926 is dio, it seems like a kernel thread
>> ps ax | grep 5926
>> 5926 ? S< 0:00 [dio/rbd0]
>>
>> - Also, there is no more dio but that one
>> ps ax | grep dio
>> 5926 ? S< 0:00 [dio/rbd0]
>
> It's a kernel workqueue, its presence itself doesn't mean much:
>
> $ sudo mkfs.ext4 /dev/rbd0
> ...
> $ sudo mount /dev/rbd0 /mnt
> $ pgrep -a dio # nothing
> $ sudo fio --ioengine=libaio --direct=1 --name=test
> --filename=/mnt/test --bs=4k --size=16M --readwrite=randwrite
> ...
> $ pgrep -a dio
> 1254 dio/rbd0
> $ ps 1254
> PID TTY STAT TIME COMMAND
> 1254 ? S< 0:00 [dio/rbd0]
> $ sudo umount /mnt # OK
>
> Thanks,
>
> Ilya
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