amd64/105437: 6.2-BETA3 crashes on amd64

[Wojciech Puchar]

>Number:         105437
>Category:       amd64
>Synopsis:       6.2-BETA3 crashes on amd64
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Nov 12 13:20:22 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Wojciech Puchar
>Release:        6.2-BETA3
>Organization:
TENSOR ap
>Environment:
FreeBSD 3miasto.net 6.2-BETA3 FreeBSD 6.2-BETA3 #0: Tue Nov  7 20:20:52 CET 2006     root at 3miasto.net:/usr/src/sys/amd64/compile/3miasto.net  amd64
>Description:
system crashes every few days without warning. memory is dumped kgdb shows:

Unread portion of the kernel message buffer:
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0xd4
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xffffffff802858b4
stack pointer           = 0x10:0xffffffffb49a1720
frame pointer           = 0x10:0x4
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = resume, IOPL = 0
current process         = 11 (swi4: clock sio)
trap number             = 12
panic: page fault
Uptime: 1d5h42m1s
Dumping 1023 MB (2 chunks)
  chunk 0: 1MB (159 pages) ... ok
  chunk 1: 1023MB (261872 pages) 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 33
5 319 303 287 271 255 239 223 207 191 175 159 143 127 111 95 79 63 47 31 15

#0  doadump () at pcpu.h:172
172             __asm __volatile("movq %%gs:0,%0" : "=r" (td));

>How-To-Repeat:
i don't need any system is normally used under moderate load by multiple users.

nothing special happens before crash.
>Fix:
no idea :(
>Release-Note:
>Audit-Trail:
>Unformatted: