[Bug 285867] 14.2-RELEASE kernel hangs on Thinkpad T400

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285867

anthony@adfw.co.uk changed:

           What    |Removed                     |Added
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                 CC|                            |anthony@adfw.co.uk

--- Comment #8 from anthony@adfw.co.uk ---
I can report the same issue with 14.2-RELEASE, and also 14-STABLE on a T400.
I've spent weeks trying to diagnose this so I'm pleased it's not just me!


The "solution" is the same as Henrich reports. Booting with kern.smp.disabled=1
is successful and I'm able to login graphically.


If I build 14-STABLE with some debugging options enabled, it will boot with SMP
enabled maybe 2 out of 3 times, and otherwise it locks up during boot (usually
just after bringing the network interfaces up). Once it boots (with or without
SMP), everything seems stable, suspend/resume works and I can do intensive
tasks like buildkernel. But of course things are slower due to the debugging
options.

Happy to try things out, unfortunately the T400 is not getting any younger and
make buildkernel without SMP takes well over 1 hour, so things take a bit of
time to test!

Regards,
Anthony

Options set as follows:

$ diff GENERIC T400
21c21
< ident         GENERIC
---
> ident		T400
95a96,106
> options 	DDB			# Support DDB
> options 	GDB			# Support remote GDB
> options 	DEADLKRES		# Enable the deadlock resolver
> options 	INVARIANTS		# Enable calls of extra sanity checking
> options 	INVARIANT_SUPPORT	# Extra sanity checks of internal structures
> options 	WITNESS			# Enable checks to detect deadlocks and cycles
> options 	WITNESS_SKIPSPIN	# Don't run witness on spinlocks for speed
> options 	ALT_BREAK_TO_DEBUGGER	# Enter debugger on keyboard escape sequence
> options 	VERBOSE_SYSINIT=0	# Support debug.verbose_sysinit, off by default

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