Bug 24210

SMP kernel hangs on boot on a Compaq DL360 (dual PIII-800, 512MB RAM).  Patch from PR 19338 was reported to have fixed thise problem with SMP and the DL360 and was applied to the stable branch on 12/8/2000 by peter@freebsd.org.  The output below does show that the workaround code from that patch is being executed (/usr/src/sys/i386/i386/mp_machdep.c).

Boot looks like this:

FreeBSD 4.2-STABLE #2: Wed Jan 10 03:33:18 GMT 2001
    root@eldiablo.pdx.webtrends.com:/usr/src/sys/compile/GENERIC-SMP
Timecounter "i8254"  frequency 1193182 Hz
CPU: Pentium III/Pentium III Xeon/Celeron (797.48-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x683  Stepping = 3
  Features=0x383f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PA
T,PSE36,MMX,FXSR,SSE>
real memory  = 536854528 (524272K bytes)
avail memory = 518397952 (506248K bytes)
APIC_IO: MP table broken: 8259->APIC entry missing!
Changing APIC ID for IO APIC #0 from 0 to 8 on chip
Programming 35 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
IOAPIC #0 intpin 24 -> irq 2

Note that the system does work correctly in 4.2-STABLE with a non-SMP kernel.

How-To-Repeat: Update system from 4.2-RELEASE to 4.2-STABLE as of January 8th.  Build a GENERIC SMP kernel by uncommenting the SMP and APIC_IO options and removing all cpu lines except I686_CPU.