Request for explanation of error message

[Bret Busby]

On 29/07/2019, Mike Marchywka <marchywka at hotmail.com> wrote:
> On Mon, Jul 29, 2019 at 05:06:16AM +0800, Bret Busby wrote:
>> On 29/07/2019, Paul Smith <paul at mad-scientist.net> wrote:
>> > On Mon, 2019-07-29 at 04:14 +0800, Bret Busby wrote:
>> >> > The first one is simple enough.  It might have been because your disk
>> >> > is full, in which case it's a symptom not a cause.  What are the
>> >> > permissions on these files?  Run this command:
>> >> >
>> >> >    ls -ald /tmp /tmp/.tX0-lock
>> >> >
>> >> > and let us know the results.
>> >>
>> >> "
>> >> bret at bret-MD34045-2521:~$ ls -ald /tmp /tmp/.tX0-lock
>> >> ls: cannot access '/tmp/.tX0-lock': No such file or directory
>> >> drwxrwxrwt 19 root root 4096 Jul 29 03:57 /tmp
>> >
>> > This looks correct.  That most likely means that this error is a
>> > symptom of your disk being full, and not the cause of the problem.
>> >
>> > After you have cleared out space on your disk, please keep an eye on
>> > the size of the /var/log/lightdm/x-0.log file.  If it continues to
>> > grow, send along the last 50 or so lines of output from that file and
>> > we'll see what it has to say.
>> >
>>
>> I have posted a message, that is awaiting moderation - a few kB too large.
>>
>> If you look at this output;
>>
>> "
>> bret at bret-MD34045-2521:~$ sudo head -25 /var/log/lightdm/x-0.log
>>
>> X.Org X Server 1.19.6
>> Release Date: 2017-12-20
>> X Protocol Version 11, Revision 0
>> Build Operating System: Linux 4.4.0-148-generic x86_64 Ubuntu
>> Current Operating System: Linux bret-MD34045-2521 4.15.0-55-generic
>> #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019 x86_64
>> Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-55-generic
>> root=UUID=1d3945d6-b596-4d57-8151-d2eef48a56b8 ro quiet splash
>> vt.handoff=1
>> Build Date: 03 June 2019  08:10:35AM
>> xorg-server 2:1.19.6-1ubuntu4.3 (For technical support please see
>> http://www.ubuntu.com/support)
>> Current version of pixman: 0.34.0
>> 	Before reporting problems, check http://wiki.x.org
>> 	to make sure that you have the latest version.
>> Markers: (--) probed, (**) from config file, (==) default setting,
>> 	(++) from command line, (!!) notice, (II) informational,
>> 	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
>> (==) Log file: "/var/log/Xorg.0.log", Time: Mon Jul 29 03:29:50 2019
>> (==) Using system config directory "/usr/share/X11/xorg.conf.d"
>> xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
>> _XSERVTransSocketUNIXAccept: accept() failed
>> _XSERVTransSocketUNIXAccept: accept() failed
>> _XSERVTransSocketUNIXAccept: accept() failed
>> _XSERVTransSocketUNIXAccept: accept() failed
>> _XSERVTransSocketUNIXAccept: accept() failed
>> _XSERVTransSocketUNIXAccept: accept() failed
>> _XSERVTransSocketUNIXAccept: accept() failed
>> "
>>
>> that last line is an endless loop.
>
> If googling the IOPL error did not work  there is stuff like this too,
>
> http://openbsd-archive.7691.n7.nabble.com/XSERVTransSocketUNIXAccept-accept-failed-td366623.html
>
> you could lsof and grep for the process, check what it has open,  or just
> make the changes and see what happens.
>

At
http://openbsd-archive.7691.n7.nabble.com/XSERVTransSocketUNIXAccept-accept-failed-td366623.html
is

"
Thanks to #openbsd's epony and oldlaptop, the resolution is to:

1. increase daemon openfiles-max to 2048 and openfiles-cur to 1024 in
/etc/login.conf
2. cap_mkdb /etc/login.conf
3. re-login.

Thanks
"

However, ...

"
bret at bret-MD34045-2521:~$ sudo cat /etc/login.conf
[sudo] password for bret:
cat: /etc/login.conf: No such file or directory

"


> I guess you could itry  " ps ax -f | grep lightdm " and see if it is root or
> has the right user for any needed  permissions.
>

"
bret at bret-MD34045-2521:~$ ps ax -f | grep lightdm
root      1256     1  0 03:29 ?        SLsl   0:00 /usr/sbin/lightdm
root      1269  1256  2 03:29 tty7     Ssl+   3:34 /usr/lib/xorg/Xorg
-core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7
-novtswitch
root      1458  1256  0 03:29 ?        Sl     0:00 lightdm --session-child 13 20
bret     15899  5719  0 06:07 pts/0    S+     0:00 grep --color=auto lightdm
bret at bret-MD34045-2521:~$
"

I do not understand the output.


>
> I guess it managed to write a few lines before even with "no" disk space :)
>

No - the file was only about 130MB - that was created after the reboot.

Now, about an hour after running the rm command against the file, the
software still has not found a way to get around it, and I have not
yet lost any more free space.

-- 
Bret Busby
Armadale
West Australia
..............

"So once you do know what the question actually is,
 you'll know what the answer means."
- Deep Thought,
 Chapter 28 of Book 1 of
 "The Hitchhiker's Guide to the Galaxy:
 A Trilogy In Four Parts",
 written by Douglas Adams,
 published by Pan Books, 1992

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