SMP forcing crash/reboot in 4.9-STABLE

guy at guy at
Thu Dec 18 07:25:12 PST 2003

On 18-Dec-2003 Adam Maloney wrote:
> We have a 4-way P3/500 Xeon system running FreeBSD.  We had been running
> 4.8-STABLE for a number of months with SMP enabled and no issues.  Around
> 25-November we moved to 4.9-STABLE.  The system ran without SMP enabled
> until Tuesday, when we enabled SMP and APIC_IO, rebuilt the kernel, and
> rebooted.  Then about every 30 minutes the system would reboot.  We moved
> back to single-processor (using the source updated on 25-Nov) and it has
> worked since.
> So we synced source last night and tried enabling SMP again this morning.
> We are still seeing the same problem.  We have switched back to a non-SMP
> kernel (from last night's sync) and are running fine.
> Has anyone else seen this?  Any ideas where to look?  There is nothing in
> messages or dmesg about the crash, and I haven't been able to catch it at
> the console to see if there's a message there.

This may be related to my problem, though the symptom is different.

Since the same time (around the end of november) i tried many times to
build a SMP-enabled 4.9-STABLE kernel for my bi-athlon machine. It always
hangs (no error msg, total iresponsiveness) at the end of the kernel boot
(just before mounting filesystems).

I then reverted my cvs tree to use -RELEASE, and all is fine.

I did not yet try a non-SMP kernel. I'll do that asap.


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