What I can say to this problem is :
- I've open a bug report : 66098 mainly for the same reason :
I'm running FreeBSD 5.2.1 patch 5 with a fresh build world (it took me 3 days to have world since gcc was hanging the machine all 5 minutes approximatly) on an SMP machine with two PIII 733 and a BIOS compatible SMP 1.4 specs (the motherboard is an MSI board) with feature like PM enable and APIC enable.
The first think I face out was when I shutdown the machine shutdown -h or -r my machine hangs at
stopping ...... vnlru.... stopped after nothing I 've seen that this allways hang when boot() is called on cpu1 and that when sometime when boot is called from cpu0 my machine can stop or reboot correctly. But boot on cpu1 represent 98% of my tests.
Some days after, when I was running an heavy compilation, I face out severals machine hangs. So I've started to investigate temperature problem, RAM problem disk, etc... Just to be sure, I've reinstall this machine under Linux with a 2.6 Kernel. No problems. So I come back to FreeBSD from a fresh install and start investigating acpi.
Since now 2 weeks, the machine never hangs with just one trick (a bad trick for sure) : acpiconf -d . I've disabled acpi management. I let boot the machine and setting up acpi conf since the acpi.ko module is load at boot time and in the final boot process I disable acpi with this command.
May be you could test to see if you experience allways the same problem or if that's solved the problem and report here the problem.
I think acpi code witch seems to be recent in FreeBSD have some problem may be due to specific management or bugs of our cheapset : mine is a VIA694. I remember that under Linux it took a long time to have a stable machine with acpi enable (in fact this was stabilize when IBM and Intel provide some code to handle acpi) : acpi code was clean but this was how specs were implemented on cheapset that was breaking code.... So they had to handle some specific chipset feature ...
Another way to test could be to disable PM in Bios for a limited time to know if the problem persist.
just my two cents.
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