linux 5.12 - fails to boot - soft lockup - CPU#0 stuck for 23s! - RIP smp_call_function_single

James Feeney <[email protected]> Fri, 30 Apr 2021 11:04:43 -0600
Newsgroups org.kernel.vger.linux-smp
Message-ID <[email protected]>
Arch Linux
linux 5.12.arch1-1

Intel Core2 T7200
Mobile Intel 945PM Express Chipset
ICH7-M
Mobility Radeon X1600


System log throws:

...
watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [systemd-udevd: 241]
...
RIP: 0010:smp_call_function_single+0xf7/0x140
...
Call Trace:
? __flush_tlb_all+0x30/0x30
? __flush_tlb_all+0x30/0x30
on_each_cpu+0x39/0x90
...

and repeats indefinitely.

smp_call_function_single is defined in kernel/smp.c