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From: Nikos Chantziaras <realnc@gmail.com>
Subject: [gentoo-user] Re: X11 crashes anyone?
Date: Sun, 26 Dec 2021 09:34:42 +0200
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On 21/12/2021 08:50, Ionen Wolkens wrote:
> On Tue, Dec 21, 2021 at 08:31:55AM +0200, Nikos Chantziaras wrote:
>> Seems to be a different issue then. I'm on an nvidia card using the
>> binary driver, and there's no problems like the ones you're having. It's
>> a straight disappearance of the desktop here when it happens due to the
>> X11 process segfault.
> [...]
> 
> With 495.44-r2 and 495.46-r10, Xorg log may have a backtrace
> mentioning libnvidia-glcore.so, if so try 495.46-r0.

Just got another one. I was smart enough this time to save 
Xorg.0.log.old before it gets overwritten. No mention of nvidia anywhere:

[ 47526.314] (EE) Backtrace:
[ 47526.321] (EE) 0: /usr/bin/X (xorg_backtrace+0x5b) [0x55c605c611cb]
[ 47526.321] (EE) 1: /usr/bin/X (0x55c605b16000+0x14f0f5) [0x55c605c650f5]
[ 47526.321] (EE) 2: /lib64/libpthread.so.0 (0x7fd0097df000+0x12660) 
[0x7fd0097f1660]
[ 47526.321] (EE) 3: /lib64/libc.so.6 (0x7fd00961c000+0x15b0b3) 
[0x7fd0097770b3]
[ 47526.321] (EE) 4: /usr/bin/X (0x55c605b16000+0x83397) [0x55c605b99397]
[ 47526.321] (EE) 5: /usr/bin/X (0x55c605b16000+0x84e11) [0x55c605b9ae11]
[ 47526.321] (EE) 6: /usr/bin/X (0x55c605b16000+0x85335) [0x55c605b9b335]
[ 47526.321] (EE) 7: /usr/bin/X (0x55c605b16000+0x863c6) [0x55c605b9c3c6]
[ 47526.321] (EE) 8: /usr/bin/X (0x55c605b16000+0x1058e5) [0x55c605c1b8e5]
[ 47526.321] (EE) 9: /usr/bin/X (XkbHandleActions+0x2b0) [0x55c605c522f0]
[ 47526.321] (EE) 10: /usr/bin/X (0x55c605b16000+0x135401) [0x55c605c4b401]
[ 47526.321] (EE) 11: /usr/bin/X (0x55c605b16000+0x1355fa) [0x55c605c4b5fa]
[ 47526.321] (EE) 12: /usr/bin/X (0x55c605b16000+0x148686) [0x55c605c5e686]
[ 47526.321] (EE) 13: /usr/bin/X (WaitForSomething+0x268) [0x55c605c5e918]
[ 47526.321] (EE) 14: /usr/bin/X (0x55c605b16000+0x77f25) [0x55c605b8df25]
[ 47526.321] (EE) 15: /usr/bin/X (0x55c605b16000+0x7c4c3) [0x55c605b924c3]
[ 47526.321] (EE) 16: /lib64/libc.so.6 (__libc_start_main+0xcd) 
[0x7fd00963f7fd]
[ 47526.321] (EE) 17: /usr/bin/X (_start+0x2a) [0x55c605b5365a]
[ 47526.321] (EE)
[ 47526.321] (EE) Segmentation fault at address 0x7fff46403180


> Alternatively, 495.46* may mention failed in libpthread (or libc if
> glibc-2.34), in that case try 495.44-r2 instead.

It does mention libc, but I'm on glibc-2.33-r7.

I guess I'll just downgrade the nvidia drivers to 470.94 anyway and see 
if it happens again.