[Bug 1753576] Re: GDM freeze

[Launchpad Bug Tracker]

[Expired for gnome-shell (Ubuntu) because there has been no activity for
60 days.]

** Changed in: gnome-shell (Ubuntu)
   Status: Incomplete => Expired

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Title:
  GDM freeze

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[Bug 1753576] Re: GDM freeze

[Launchpad Bug Tracker]

[Expired for xorg (Ubuntu) because there has been no activity for 60
days.]

** Changed in: xorg (Ubuntu)
   Status: Incomplete => Expired

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Title:
  GDM freeze

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[Bug 1753576] Re: GDM freeze

[Launchpad Bug Tracker]

[Expired for gdm3 (Ubuntu) because there has been no activity for 60
days.]

** Changed in: gdm3 (Ubuntu)
   Status: Incomplete => Expired

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Title:
  GDM freeze

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[Bug 1753576] Re: GDM freeze

[Daniel van Vugt]

Wayland is not a program, so "Wayland" can't crash. Wayland is only a
protocol for talking to apps that is supported by the Gnome Shell
'eglnative' backend inside the 'mutter' project. This issue is further
confused by the incorrect wording "Ubuntu on Wayland" on the login
screen. Actually it's not running "on Wayland" at all...

That all said, yes the eglnative backend in mutter, which provides
Wayland app support, can crash for its own reasons.

The greeter will default to eglnative ("Wayland") mode, so if you find
disabling that works around the bug (switching to Xorg instead) then
great. However this bug will stay incomplete until we have some sort of
stack trace of a crash, ideally a .crash file.

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Re: [Bug 1753576] Re: GDM freeze

[Nish Aravamudan]

Hi Daniel,

On Mon, Mar 5, 2018 at 9:56 PM, Daniel van Vugt
 wrote:
> Nish,
>
> To figure the problem out you will need to be logged in already while
> it's happening(!), so..

Yeah, tricky when the machine physically seems to be hung (no
touchpad, no responsiveness to keyboard)

> 1. Log into a VT (Ctrl+Alt+F4) or install openssh-server and log in from a 
> separate machine.
> 2. Run 'top' to find the ID of the spinning process.
> 3. Run:
>kill -ABRT 
> 4. Wait a while for crash files to be written.
> 5. Look in /var/crash for crash files and run:
>ubuntu-bug /var/crash/YOURFILE.crash
> 6. Add a comment here telling us the ID of the new bug.

Thanks for the info!

I just was wondering, as the responsiveness of the desktop feels very
different, and it does seem like I'm now on an Xwayland session, even
though I didn't change anything. I wonder if it's Wayland that's
actually crashing?

gdm   2795  0.0  0.0 190684  5496 tty1 Ssl+ Mar05   0:00
/usr/lib/gdm3/gdm-wayland-session gnome-session --autostart
/usr/share/gdm/greeter/autostart
gdm   2878  0.0  0.3 563888 55076 tty1 Sl+  Mar05   0:00
/usr/bin/Xwayland :1024 -rootless -terminate -accessx -core -listen 4
-listen 5 -displayfd 6
nacc  3428  0.0  0.0 190684  5408 tty2 Ssl+ Mar05   0:00
/usr/lib/gdm3/gdm-wayland-session gnome-session --session=gnome
nacc  3502  0.0  0.3 565704 56056 tty2 Sl+  Mar05   0:02
/usr/bin/Xwayland :0 -rootless -terminate -accessx -core -listen 4
-listen 5 -displayfd 6

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[Bug 1753576] Re: GDM freeze

[Nish Aravamudan]

I edited /etc/gdm3/custom.conf and put WaylandEnable=false back in (I
had it enabled before to test). Greeter came right up on reboot and my
external monitor works again.

What is curious is that my session choice in both cases was/is Gnome on
Xorg. So is it possible there's some change in the greeter's behavior?
As to using wayland or not.

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[Bug 1753576] Re: GDM freeze

[Daniel van Vugt]

dino99,

Given the large number of bugs we're dealing with it would be safer for
you to log your own bug. Often two people with similar symptoms turn out
to have different bugs.

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[Bug 1753576] Re: GDM freeze

[Daniel van Vugt]

Nish,

To figure the problem out you will need to be logged in already while
it's happening(!), so..

1. Log into a VT (Ctrl+Alt+F4) or install openssh-server and log in from a 
separate machine.
2. Run 'top' to find the ID of the spinning process.
3. Run:
   kill -ABRT 
4. Wait a while for crash files to be written.
5. Look in /var/crash for crash files and run:
   ubuntu-bug /var/crash/YOURFILE.crash
6. Add a comment here telling us the ID of the new bug.

** Changed in: gdm3 (Ubuntu)
   Status: Confirmed => Incomplete

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[Bug 1753576] Re: GDM freeze

[Nish Aravamudan]

But if I plug in my usb-c dongle, it immediately freezes and the fans
start to spin. Unplugging the dongle has no effect. Suggestions for
debugging?

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[Bug 1753576] Re: GDM freeze

[Nish Aravamudan]

I just rebooted again and without hitting any keys, it did come up to
the greeter without issue.

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[Bug 1753576] Re: GDM freeze

[dino99]

Also now get a 'smooth' freeze (kind of race, as the hdd is heavily used
before getting the login screen. But booting with 'plymooth:debug'
kernel option, journalctl has logged:

***
Mar 06 04:19:47 ubuntu plymouth[660]: [./ply-boot-client.c:183] 
  ply_boot_client_connect:could not connect to /org/freedesktop/plymouthd: 
Connection refused
Mar 06 04:19:47 ubuntu plymouth[660]: [./ply-boot-client.c:184] 
  ply_boot_client_connect:trying old fallback path /ply-boot-protocol
Mar 06 04:19:47 ubuntu plymouth[660]: [./ply-boot-client.c:190] 
  ply_boot_client_connect:could not connect to /ply-boot-protocol: 
Connection refused
Mar 06 04:19:47 ubuntu plymouth[660]: [./plymouth.c:1121]   
   main:daemon not running
Mar 06 04:19:47 ubuntu plymouth[660]: [./ply-boot-client.c:810]
ply_boot_client_detach_from_event_loop:detaching from event loop
Mar 06 04:19:56 ubuntu plymouth[1011]: [./ply-boot-client.c:183]
   ply_boot_client_connect:could not connect to /org/freedesktop/plymouthd: 
Connection refused
Mar 06 04:19:56 ubuntu plymouth[1011]: [./ply-boot-client.c:184]
   ply_boot_client_connect:trying old fallback path /ply-boot-protocol
Mar 06 04:19:56 ubuntu plymouth[1011]: [./ply-boot-client.c:190]
   ply_boot_client_connect:could not connect to /ply-boot-protocol: 
Connection refused
Mar 06 04:19:56 ubuntu plymouth[1011]: [./plymouth.c:1121]  
main:daemon not running
Mar 06 04:19:56 ubuntu plymouth[1011]: [./plymouth.c:1132]  
main:no need to wait
Mar 06 04:19:56 ubuntu gdm3[1016]: [./ply-boot-client.c:183]
   ply_boot_client_connect:could not connect to /org/freedesktop/plymouthd: 
Connection refused
Mar 06 04:19:56 ubuntu gdm3[1016]: [./ply-boot-client.c:184]
   ply_boot_client_connect:trying old fallback path /ply-boot-protocol
Mar 06 04:19:56 ubuntu gdm3[1016]: [./ply-boot-client.c:190]
   ply_boot_client_connect:could not connect to /ply-boot-protocol: Connection 
refused
Mar 06 04:19:56 ubuntu gdm3[1016]: [./plymouth.c:1121]  
main:daemon not running
Mar 06 04:19:56 ubuntu gdm3[1016]: [./plymouth.c:1124]  
main:ping failed
***

** Changed in: gdm3 (Ubuntu)
   Status: Incomplete => Confirmed

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[Bug 1753576] Re: GDM freeze

[Nish Aravamudan]

Hrm, I'm not entirely sure what just changed. I rebooted and unlike
before, I hit Escape at the splash screen, and the GDM greeter showed up
just fine (after hitting Escape again to go back to graphics mode). I'll
see if that's reproducible shortly.

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[Bug 1753576] Re: GDM freeze

[Nish Aravamudan]

@vanvugt: no, as it's not crashed (afaict), it's just 100% cpu (based
upon fans). Numlock is still responsive as is sysrq, but i can't get to
any ttys (that is, ctrl+alt+f2, etc don't seem to work).

I even tried booting with 'text' and annoyingly gdm still started (I
might be misremembering how to do that, though).

Any suggestions on how to force a crash?

I might reboot now and just leave it to see if it eventually progresses.

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[Bug 1753576] Re: GDM freeze

[Nish Aravamudan]

Oh also the splash screen correctly displays on both monitors, so i
think it must be in X that the multiple displays fail.

I'll see if I can figure out how to get to a temrinal.

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[Bug 1753576] Re: GDM freeze

[Daniel van Vugt]

Can you find any crash files in /var/crash ?

If so then please run:

  ubuntu-bug /var/crash/YOURFILE.crash

and tell us the new bug ID.

** Summary changed:

- Xorg freeze
+ GDM freeze

** Also affects: gdm3 (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: gdm3 (Ubuntu)
   Status: New => Incomplete

** Changed in: gnome-shell (Ubuntu)
   Status: New => Incomplete

** Changed in: xorg (Ubuntu)
   Status: New => Incomplete

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