Fedora 43 kernel 6.18 Chromium based browser crash

[g a]

No help on this so far at the Fedora Community Support list.

Since my update to kernel(s) 6.18 (and minors), Chromium-based browsers crash on startup. Sometimes the initial launch, after reboot is fine, but subsequent launches crash:

radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000100000000
radeon: Failed to deallocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    va        : 0x100000000
radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000100000000
radeon: Failed to deallocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    va        : 0x100000000
radeonsi: error: can't create border_color_buffer
radeonsi: error: Failed to create a context.
[9095:9095:0125/123848.665358:ERROR:content/browser/gpu/gpu_process_host.cc:1004] GPU process exited unexpectedly: exit_code=139
[9095:9095:0125/123848.665415:FATAL:content/browser/gpu/gpu_data_manager_impl_private.cc:415] GPU process isn't usable. Goodbye.
[0125/123848.708552:ERROR:third_party/crashpad/crashpad/snapshot/elf/elf_dynamic_array_reader.h:64] tag not found
[0125/123848.710446:ERROR:third_party/crashpad/crashpad/snapshot/elf/elf_dynamic_array_reader.h:64] tag not found
[0125/123848.712883:ERROR:third_party/crashpad/crashpad/snapshot/elf/elf_dynamic_array_reader.h:64] tag not found
[0125/123848.713955:ERROR:third_party/crashpad/crashpad/snapshot/elf/elf_dynamic_array_reader.h:64] tag not found
Trace/breakpoint trap      (core dumped) google-chrome-stable

Assumption it's related to video hardware (radeon), which is:

user@localhost:~$ lspci -k | grep -EA3 'VGA|3D|Display'
00:02.0 VGA compatible controller: Intel Corporation Skylake-H GT2 [HD Graphics 530] (rev 06)
DeviceName:  Onboard IGD
Subsystem: Dell Device 06e0
Kernel driver in use: i915
--
01:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde PRO / Venus LE / Tropo PRO-L [Radeon HD 8830M / R7 250 / R7 M465X] (rev 87)
Subsystem: Dell Device 06e0
Kernel driver in use: radeon
Kernel modules: radeon, amdgpu

In twenty-plus years of Fedora Linux usage this is the first problem I haven't been able to solve on my own! Anyone with suggestions on where to turn / how to proceed? I found the coredump files but don't know how to interpret them.

GZ