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#1 2021-09-02 22:21:45

nPHYN1T3
Member
Registered: 2020-01-07
Posts: 23

XFCE4-(everything) crashes on Multi XScreen/GPU) v4.14

[ 46.504672] xfce4-session[1220]: segfault at 0 ip 00007f52d3e7fb7e sp 00007ffd390d35f8 error 4 in libc-2.31.so[7f52d3d1e000+178000]
[ 50.355096] traps: xfwm4[1387] trap int3 ip:7fd80682a295 sp:7ffe4072be80 error:0 in libglib-2.0.so.0.6400.6[7fd8067ee000+84000]

I've recently tried to upgrade my machine from Ubuntu 18.04.5 to 20.04.3. I notice as soon as there is another XScreen everything dies. Things worked in 16.04 to 18.04...now it's borked. I also tested with 21.04 and the problem persists.

I feel this is more likely an XOrg or kernel change affecting things down the line but any input on how to figure out/fix this is appreciated.

Steps to reproduce, add a second XScreen (potentially requiring said XScreen to have screens attached to a second GPU)

Last edited by nPHYN1T3 (2021-09-03 22:19:11)

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#2 2021-09-03 18:47:00

Skaperen
Member
From: right by Jesus, our Saviour
Registered: 2013-06-15
Posts: 558

Re: XFCE4-(everything) crashes on Multi XScreen/GPU) v4.14

it looks like a memory address used for function calling or similar got written over with 0 and got used in libc.  that or some bad code apparently in libc is using pointers to hold function or jump addresses.  it looks like something jumped/called to memory location 0.  the cause of an overwrite of virtual memory could be almost anywhere.  where do you see this output?

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#3 2021-09-03 21:59:11

nPHYN1T3
Member
Registered: 2020-01-07
Posts: 23

Re: XFCE4-(everything) crashes on Multi XScreen/GPU) v4.14

That was just the dmesg output on Xubuntu 20.04.3. On 21.04 xfwm4 doesn't crash in an endless loop along with everything else (after some updates) but if you run things on any XScreen outside 0.0 you can't set the theme/decorations/fonts etc. I've filed a bug for that too.

Seems like somewhere past Ubu 18.XX things got real weird. Same issues on some Arch distros too.

Last edited by nPHYN1T3 (2021-09-03 22:35:40)

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