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seth

Member

Registered: 2012-09-03

Posts: 64,547

Re: [SOLVED] Xorg dumps core after screen lock XFCE

@eriol

[   410.820] (EE) Backtrace:
[   410.820] (EE) 0: /usr/lib/Xorg (xorg_backtrace+0x53) [0x5654d111fbd3]
[   410.820] (EE) 1: /usr/lib/Xorg (0x5654d0fd9000+0x151a15) [0x5654d112aa15]
[   410.820] (EE) 2: /usr/lib/libc.so.6 (0x7f5547266000+0x3d6a0) [0x7f55472a36a0]
[   410.820] (EE) 3: /usr/lib/Xorg (0x5654d0fd9000+0x7ef03) [0x5654d1057f03]
[   410.820] (EE) 4: /usr/lib/Xorg (ChangeWindowAttributes+0xd7f) [0x5654d107afaf]
[   410.820] (EE) 5: /usr/lib/Xorg (0x5654d0fd9000+0x6fa58) [0x5654d1048a58]
[   410.820] (EE) 6: /usr/lib/Xorg (0x5654d0fd9000+0x3a165) [0x5654d1013165]
[   410.820] (EE) 7: /usr/lib/libc.so.6 (__libc_start_main+0xf2) [0x7f554728e152]
[   410.820] (EE) 8: /usr/lib/Xorg (_start+0x2e) [0x5654d10135ae]
[   410.820] (EE) 
[   410.820] (EE) Segmentation fault at address 0x18
[   410.820] (EE) 

That looks more like https://bbs.archlinux.org/viewtopic.php?id=258590 but the logs don't cover the BadValue details.

Same goes for https://gitlab.freedesktop.org/xorg/xse … ssues/1073 from #25
W/o details on the X11 error predating this, we don't know whether the two are related.
The BadValue error in https://bbs.archlinux.org/viewtopic.php?id=258590 crashes xfwm4 and then it seems in turn the Xorg server crashes - the patterns are distinctly different (window attributes and input handling) and consistent, so I don't think it's the same underlying bug in Xorg.

@avallac_h, that "only" covers the "mieqProcessInputEvents" segfault originally discussed in this thread before mugamma brought up the secondary ChangeWindowAttributes bug.

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andrewclive

Member

Registered: 2019-05-19

Posts: 29

Re: [SOLVED] Xorg dumps core after screen lock XFCE

I've just updated my office machine to to the latest Xorg 1.20.9-1 - and the same problem occurs with light-locker and Xorg crashing - I've tried xfce4-screensaver as an alternative locker and it works fine.

avallac_h

Member

Registered: 2009-07-27

Posts: 5

Re: [SOLVED] Xorg dumps core after screen lock XFCE

@seth Perhaps I can explain why the name of the function in the stack trace can vary. I guess it depends on the last action performed by the user before the crash:

• If you performed a mouse click right before the crash you'll most likely end with mieqProcessDeviceEvent() error.

• If you have sloppy mouse focus enabled, like I do, you just need to move the mouse: cursor leaves the window, window state changes, bang, ChangeWindowAttributes() error.

• I even got a ChangeWindowDeviceCursor() error once. Not sure what caused it, highlighting a hyperlink in a web-browser, maybe. Or moving the cursor to the window border (those resize arrows).

авг 30 19:32:20 nuc systemd-coredump[8889]: Process 4716 (Xorg) of user 0 dumped core.

                                               Stack trace of thread 4716:
                                               #0  0x00007f4b5136e615 raise (libc.so.6 + 0x3d615)
                                               #1  0x00007f4b51357862 abort (libc.so.6 + 0x26862)
                                               #2  0x0000561aa903035a OsAbort (Xorg + 0x14a35a)
                                               #3  0x0000561aa9031e21 FatalError (Xorg + 0x14be21)
                                               #4  0x0000561aa9037a79 n/a (Xorg + 0x151a79)
                                               #5  0x00007f4b5136e6a0 __restore_rt (libc.so.6 + 0x3d6a0)
                                               #6  0x0000561aa8f64f03 n/a (Xorg + 0x7ef03)
                                               #7  0x0000561aa8f8c03b ChangeWindowDeviceCursor (Xorg + 0xa603b)
                                               #8  0x0000561aa8ff25cd n/a (Xorg + 0x10c5cd)
                                               #9  0x0000561aa8f20165 n/a (Xorg + 0x3a165)
                                               #10 0x00007f4b51359152 __libc_start_main (libc.so.6 + 0x28152)
                                               #11 0x0000561aa8f205ae _start (Xorg + 0x3a5ae)

Could it be that lightdm (light-locker?) somehow kills Xorg and as a result we see the name of last function used?

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If you are doing it, I'm doing it. If I don't do it, will you? If you don't do it, I'll do it. I'm doing it so that you do it too!! (c) Kamina

shellback

Member

Registered: 2015-01-17

Posts: 30

Re: [SOLVED] Xorg dumps core after screen lock XFCE

I can (as many previous) confirm that downgrading xorg-server does eliminates these crashes. If anyone needs more logs, you find a couple in the other thread https://bbs.archlinux.org/viewtopic.php … 7#p1923497 including those from lightdm if any one is interested (as seth predicted, I can't find any interesting in them, but on the other side, my knowledge in interpreting logs is low at best).

avallac_h

Member

Registered: 2009-07-27

Posts: 5

Re: [SOLVED] Xorg dumps core after screen lock XFCE

Xorg devs found a regression in 1.20.9 that applies our case:
https://gitlab.freedesktop.org/xorg/xse … ssues/1067

Patch is already available, maybe someone wants to test it:
https://gitlab.freedesktop.org/xorg/xse … quests/504

Update:
I confirm that the patch works around this issue.

PKGBUILD.diff for those who want to try it out (use with caution!).

Last edited by avallac_h (2020-08-31 16:23:14)

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If you are doing it, I'm doing it. If I don't do it, will you? If you don't do it, I'll do it. I'm doing it so that you do it too!! (c) Kamina

andrewclive

Member

Registered: 2019-05-19

Posts: 29

Re: [SOLVED] Xorg dumps core after screen lock XFCE

Okay - I'm going to mark this thread as solved. avallac_h has tested a patch, that works,  which i assume will be added to the next iteration of xorg-server. Also, a downgrade will fix the issue until it has been officially corrected. Finally, using a different locker such as XFCE4-screensaver will work around the problem. Many thanks to all those who have contributed to this thread.