xfwm4 segfault launching most apps after update to kernel 5.4.0-150

[Ken Brazier]

When I installed a security update to the kernel, I got into a graphical login loop on reboot. After updating Nvidia drivers to 525, I can log in but xfwm4 crashed immediately. After removing ~/.cache/sessions/*, xfwm4 does not crash on login, but launching almost any app causes it to crash. A dice game called Tali does not cause a crash, but Terminal, Firefox, and Chromium do.

/var/log/syslog lists six segfaults, each like this, every time a crash occurs:

May 31 17:48:42 localhost kernel: [ 11.173872] xfwm4[2621]: segfault at 10 ip 00007f41862bcfc4 sp 00007ffc5ecd0b38 error 4 in libpthread-2.31.so[7f41862b8000+11000]
May 31 17:48:42 localhost kernel: [ 11.173879] Code: 7e 8f 45 31 d2 ba 01 00 00 00 be 01 00 00 00 48 89 ef b8 ca 00 00 00 0f 05 e9 73 ff ff ff e8 13 b7 ff ff 0f 1f 00 f3 0f 1e fa <8b> 47 10 89 c2 81 e2 7f 01 00 00 90 83 e0 7c 75 7b 53 48 83 ec 10

More details at https://ubuntuforums.org/showthread.php?t=2487354
System info in https://pastebin.ubuntu.com/p/ngzDVMdFZP/