linux-kernel - Re: USB Attached SCSI breakage due no udev involvement

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Message-ID: <80d4f4d9-91be-b7e8-1f64-13c2fe74f496@gmail.com>
Date:   Sun, 10 May 2020 16:48:30 +0700
From:   Dio Putra <dioput12@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     oneukum@...e.com, linux-usb@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-scsi@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
        stern@...land.harvard.edu, linux-kernel@...r.kernel.org
Subject: Re: USB Attached SCSI breakage due no udev involvement

On 5/10/20 3:48 PM, Greg KH wrote:
> On Sun, May 10, 2020 at 03:35:34PM +0700, Dio Putra wrote:
>> 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:
>>>> https://www.kernel.org/doc/html/v4.12/process/email-clients.html#thunderbird-gui ) 
>>>
>>> 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.
> 
> Again, I really do not understand what exactly is "not working".
> 
> Please explain that when you send the new log messages.
> 
Okay, here's compilation of "dmesg | grep -i udev && udevadm
monitor && lsblk" on linux-4.4.221 vs linux-5.4.39. You can check
my attachment here because I can't explain it by words (I'm not
english native speaker anyway, which makes it so difficult to
explain it for me).

>>>>>>> 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:
>>>> https://github.com/gentoo/eudev
>>>
>>> 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.
> 
> Why would it take a long time to do this type of change?
> 
It's a weak machine, it took appropriately 2 hours to just compiling
linux kernel. I need to think twice too because electricity is expensive here.
 
> thanks,
> 
> greg k-h
> 


View attachment "linux-4.4.221-compilation_log.txt" of type "text/plain" (40551 bytes)

View attachment "linux-5.4.39-compilation_log.txt" of type "text/plain" (6454 bytes)