Page Fault.

[Keith]

Have a machine, Dell dual CPU/quad core Xeon. Runs FBSD 6.2.
Custom kernel, with IPFW compiled in and using SMP.

FreeBSD <hostname> 6.2-RELEASE FreeBSD 6.2-RELEASE #1: Wed Jan 23
12:17:29 PST 2008

It runs, Dovecot, Postfix, Mysql, Apache. Standard email stuff. Put into
production in March, ran perfect until July 29th when it rebooted by
itself.

It rebooted 2 more times in the last few months on its own. But in the
last 6 weeks it has become a weekly occurance, with uptime no more than
6-7 days at most.

The last 2 times I have cores and have run kgdb on them. Both vmcore's
show the same things. Same pointers etc, the only difference is what the
cpuid was at the time.

======
kernel trap 12 with interrupts disabled

Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address   = 0x104
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc066ca51
stack pointer           = 0x28:0xe6ec0c90
frame pointer           = 0x28:0xe6ec0c9c
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 0
current process         = 9 (thread taskq)
trap number             = 12
panic: page fault
cpuid = 2
Uptime: 6d6h23m45s
Dumping 3327 MB (2 chunks)
  chunk 0: 1MB (159 pages) ... ok
  chunk 1: 3327MB (851624 pages) 3311 3295 3279 3263 3247 3231 3215 3199
3183 3167 3151 3135 3119 3103 3087 3071 3055 3039 3023 3007 2991 2975 2959
2943 2927 2911 2895 2879 2863 2847 2831 2815 2799 2783 2767 2751 2735 2719
2703 2687 2671 2655 2639 2623 2607 2591 2575 2559 2543 2527 2511 2495 2479
2463 2447 2431 2415 2399 2383 2367 2351 2335 2319 2303 2287 2271 2255 2239
2223 2207 2191 2175 2159 2143 2127 2111 2095 2079 2063 2047 2031 2015 1999
1983 1967 1951 1935 1919 1903 1887 1871 1855 1839 1823 1807 1791 1775 1759
1743 1727 1711 1695 1679 1663 1647 1631 1615 1599 1583 1567 1551 1535 1519
1503 1487 1471 1455 1439 1423 1407 1391 1375 1359 1343 1327 1311 1295 1279
1263 1247 1231 1215 1199 1183 1167 1151 1135 1119 1103 1087 1071 1055 1039
1023 1007 991 975 959 943 927 911 895 879 863 847 831 815 799 783 767 751
735 719 703 687 671 655 639 623 607 591 575 559 543 527 511 495 479 463
447 431 415 399 383 367 351 335 319 303 287 271 255 239 223 207 191 175
159 143 127 111 95 79 63 47 31 15

#0  doadump () at pcpu.h:165
165             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
============

What might be the cause for this? It is the in the same place every time.
Once the machine hung and had to be powercycled. But on the screen was the
same page fault error on the same process.

Is this flaky hardware?

Thanks,
Keith.