So the results.

Xeon machine: boots fine until 832MB RAM, after that came the known error. I raised memory in 32MB steps, so 832MB is fine and 864MB causes the crash.


Opteron machine with 512MB (I think Colin wanted to debug this error not the memory related.):

CPU: Quad-Core AMD Opteron(tm) Processor 2376 (2300.09-MHz 686-class CPU)
Origin = "AuthenticAMD" Id = 0x100f42 Family = 10 Model = 4 Stepping = 2

Features=0x1783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,HTT>
  Features2=0x802009<SSE3,MON,CX16,POPCNT>
AMD Features=0xee500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM,3DNow!+,3DNow!> AMD Features2=0x37ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,SKINIT,WDT>
  TSC: P-state invariant
real memory  = 536870912 (512 MB)
avail memory = 515928064 (492 MB)
[XEN] IPI cpu=0 irq=128 vector=RESCHEDULE_VECTOR (0)
[XEN] IPI cpu=0 irq=129 vector=CALL_FUNCTION_VECTOR (1)
xs_probe: Probe retuns 0
xenstore0: <XenStore> on motherboard
[XEN] xen_rtc_probe: probing Hypervisor RTC clock
rtc0: <Xen Hypervisor Clock> on motherboard
[XEN] xen_rtc_attach: attaching Hypervisor RTC clock
xc0: <Xen Console> on motherboard
Timecounters tick every 10.000 msec
xenbusb_front0: <Xen Frontend Devices> on xenstore0
kernel trap 9 with interrupts disabled


Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer     = 0x21:0xc0321241
stack pointer           = 0x29:0xc21ffc8c
frame pointer           = 0x29:0xc21ffc94
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 1, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 0
current process         = 11 (idle: cpu0)
[thread pid 11 tid 100003 ]
Stopped at      spinlock_exit+0xe1:     hlt



Regards,
Andras


Sergey G Nasonov wrote:
I am sorry for intrusion. I have the same problem (pmap_init) running FreeBSD 8.2 r217259 i386 PV mode on Citrix XenServer 5.6. The server is IBM x3650 with intel Xeon 5405
cpu_count                : 4
                   vendor: GenuineIntel
                    speed: 1995.001
                modelname: Intel(R) Xeon(R) CPU           E5405  @ 2.00GHz
                   family: 6
                    model: 23
                 stepping: 6
                    flags: fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov 
pat clflush acpi mmx fxsr sse sse2 ss ht constant_tsc pni vmx ssse3 sse4_1
                 features: 000ce33d-bfebfbff-00000001-20000800
    features_after_reboot: 000ce33d-bfebfbff-00000001-20000800
        physical_features: 000ce33d-bfebfbff-00000001-20000800
                 maskable: base

WARNING: loader(8) metadata is missing!
GDB: no debug ports present
KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2011 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.2-PRERELEASE #4: Wed Jan 12 13:30:44 MSK 2011
    r...@fbsd8x32.bcc.:/usr/obj/usr/src/sys/XEN i386
WARNING: WITNESS option enabled, expect reduced performance.
panic: pmap_init: page table page is out of range
cpuid = 0
KDB: enter: panic
[thread pid 0 tid 0 ]
Stopped at      0xc010ab0a:     movl    $0,0xc03e6f74
db> db> db>

FreeBSD VM has 1GB memory. And this problem does not appear when I reduce amount of RAM to 512 MB. Unfortunately, currently I dont have any servers with AMD Opteron CPU to test.

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