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Date:   Sun, 10 May 2020 15:35:34 +0700
From:   Dio Putra <>
To:     Greg KH <>
Subject: Re: USB Attached SCSI breakage due no udev involvement

On 5/10/20 2:32 PM, Greg KH wrote:
> On Sun, May 10, 2020 at 02:10:04PM +0700, Dio Putra wrote:
>> On 5/10/20 1:54 PM, Greg KH wrote:
>>> On Sun, May 10, 2020 at 01:48:24PM +0700, Dio Putra wrote:
>>>> On 5/10/20 12:47 PM, Greg KH wrote:
>>>>> On Sun, May 10, 2020 at 09:55:57AM +0700, Dio Putra wrote:
>>>>>> Hi, it's first time for me to report user-space breakage in here, so
>>>>>> i'm begging your pardon.
>>>>>> I want to report that Linux 5.4 breaking my USB mount workflow due
>>>>>> udevadm monitor report here (I'm using vanilla kernel 5.4.39 on
>>>>>> Slackware64 Current and vanilla kernel 4.4.221 on Slackware64 14.2):
>>>>> <snip>
>>>>> Sorry, but what actually changed that you can see in the logs?
>>>> Sorry, what do you mean? The dmesg log or the kernel changelogs?
>>> Either, your message made them pretty impossible to compare with all of
>>> the line-wrapping :(
>> I'm so sorry for first message mess, because that message has been sent by
>> Gmail Website. Can I send my logs as attachment? I try to convenient everyone
>> here. ( FYI, I just switched to Thunderbird with these settings:
>> ) 
> Sure, attachments work, but better yet, if you can show the difference
> in a few lines that is much nicer than having to dig through large
> numbers of log files.
Okay, I'll attach long messages and trim it as far as I can.

>>>>> What functionality broke?  What used to work that no longer does work?
>>>> Yes, it supposed that just work and kernel could talk with udev, not just handled by the kernel.
>>> I don't understand, what functionality changed?  What exactly used to
>>> work that no longer does?
>> linux-5.4 has been never called the udev dependencies whereas
>> linux-4.4 will call any udev dependencies if necessary, that's the problem.
> I do not understand what exactly you mean by "call udev dependencies".
> udev is used to create symlinks and set user/group permissions on device
> nodes in /dev/ which is created by devtmpfs.  What exactly is not
> happening in your /dev/ with the move to a newer kernel?
Would I send my dmesg log with "udev.log-priority=debug" as attachment then?

>>> Did you change anything else other than the kernel on your system?  Did
>>> you change to a newer version of udev/systemd or anything else?
>> I'm using eudev-master from their official mirror github:
> Have you contacted the eudev developers to see if something different
> needs to be set in your kernel when moving 4 years in kernel development
> forward?  Are you sure you have all the correct config options enabled?
It's my bad not to contact the eudev developers first. However I'm not quite
sure to contact the eudev developers would solve the problem, but CMIIW.

> Why such a huge leap forward all at once, how about going from 4.4.y to
> 4.9.y and then 4.14.y and then 5.4.y?  That might help narrow things
> down a bit easier.
Unfortunately I need to think twice due almost ran out of electricity
here every time I power on my laptop for long time. So maybe I can't.

But if these steps are necessary, I'll think solution later.
> thanks,
> greg k-h

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