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Date: Thu, 9 Oct 2008 09:47:33 GMT
From: Shakul M Hameed <smohideen@mx2.labs.rootshell.ws>
To: freebsd-gnats-submit@FreeBSD.org
Subject: 7.0 RELEASE PANIC
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>Number:         127971
>Category:       kern
>Synopsis:       [panic] 7.0 RELEASE PANIC
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Oct 09 09:50:01 UTC 2008
>Closed-Date:    Wed Oct 12 15:01:33 UTC 2011
>Last-Modified:  Wed Oct 12 15:01:33 UTC 2011
>Originator:     Shakul M Hameed
>Release:        FreeBSD freebsdbox 7.0-RELEASE FreeBSD 7.0-RELEASE
>Organization:
Individual
>Environment:
FreeBSD freebsdbox 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sun Feb 24 19:59:52 UTC 2008     root@logan.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

>Description:

This problem is not reproducible.


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x2008
fault code              = supervisor write, page not present
instruction pointer     = 0x20:0xc0a44d43
stack pointer           = 0x28:0xccc53bc4
frame pointer           = 0x28:0xccc53c04
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 28098 (cc1plus)
trap number             = 12
panic: page fault
cpuid = 0
Uptime: 14m28s
Physical memory: 235 MB
Dumping 55 MB: 40 24 8

#0  doadump () at pcpu.h:195
195     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) bt
#0  doadump () at pcpu.h:195
#1  0xc0754457 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc0754719 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xc0a4905c in trap_fatal (frame=0xccc53b84, eva=8200)
    at /usr/src/sys/i386/i386/trap.c:899
#4  0xc0a492e0 in trap_pfault (frame=0xccc53b84, usermode=0, eva=8200)
    at /usr/src/sys/i386/i386/trap.c:812
#5  0xc0a49c8c in trap (frame=0xccc53b84) at /usr/src/sys/i386/i386/trap.c:490
#6  0xc0a2fc0b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7  0xc0a44d43 in pmap_remove_pages (pmap=0xc20b625c)
    at /usr/src/sys/i386/i386/pmap.c:3124
#8  0xc097585c in vmspace_exit (td=0xc230aa50) at /usr/src/sys/vm/vm_map.c:404
#9  0xc0732f1a in exit1 (td=0xc230aa50, rv=0) at /usr/src/sys/kern/kern_exit.c:294
#10 0xc073426d in sys_exit (td=Could not find the frame base for "sys_exit".
) at /usr/src/sys/kern/kern_exit.c:98
#11 0xc0a49635 in syscall (frame=0xccc53d38) at /usr/src/sys/i386/i386/trap.c:1035
#12 0xc0a2fc70 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:196
#13 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)


>How-To-Repeat:
NOT REPRODUCIBLE. I was running 4-5 parallel session of /usr/port
compilation when this panic happened.
>Fix:
Not yet

>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->feedback 
State-Changed-By: jh 
State-Changed-When: Fri Sep 23 20:00:29 UTC 2011 
State-Changed-Why:  
This might be a hardware problem. Is this still a problem for you? 

http://www.freebsd.org/cgi/query-pr.cgi?pr=127971 
State-Changed-From-To: feedback->closed 
State-Changed-By: remko 
State-Changed-When: Wed Oct 12 15:01:31 UTC 2011 
State-Changed-Why:  
Feedback timeout 

http://www.freebsd.org/cgi/query-pr.cgi?pr=127971 
>Unformatted:
faulting code in pmap.c 3124 TAILQ_REMOVE()
3121:pv_entry_count--;
3122:pc->pc_map[field] |= bitmask;
3123:m->md.pv_list_count--;
3124:TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
3125:if (TAILQ_EMPTY(&m->md.pv_list))
3126:	vm_page_flag_clear(m, PG_WRITEABLE);

