Bug 20685

Comment 1 Sheldon Hearn 2000-08-17 17:20:11 UTC

State Changed
From-To: open->feedback

Could you get a backtrace with debugging symbols?  You'll 
need a debugging kernel (``makeoptions DEBUG=-g'' in the 
kernel config file and config'd with config -g). 

Once you have one, have a look at the instructions at: 

http://www.freebsd.org/handbook/kerneldebug.html 

Be sure to send your follow-up to 
<freebsd-gnats-submit@freebsd.org>, preserving the Subject 
line of this e-mail message.

> Could you get a backtrace with debugging symbols?  You'll
> need a debugging kernel (``makeoptions DEBUG=-g'' in the
> kernel config file and config'd with config -g).
> Once you have one, have a look at the instructions at:
>         http://www.freebsd.org/handbook/kerneldebug.html
> Be sure to send your follow-up to
> <freebsd-gnats-submit@freebsd.org>, preserving the Subject
> line of this e-mail message.
> http://www.freebsd.org/cgi/query-pr.cgi?pr=20685

hm. weird. I just compiled the kernel with the debugging options, and now 
it doesn't seem to crash any more... my box has now been compiling licq
for 
about half an hour, and it hasn't panic'ed yet. With the old kernel it 
crashed after two or three minutes of compiling. I guess, you can mark the

bug report as resolved. I don't know *what* caused that unstability (I'd
really like to know), but it it now seems to be gone.

Sorry for the trouble!

Regards, 
     Jonas

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> Could you get a backtrace with debugging symbols?  You'll
> need a debugging kernel (``makeoptions DEBUG=-g'' in the
> kernel config file and config'd with config -g).

Sorry, I was too quick. It now only takes quite a while longer until it 
crashes. I'll send you a backtrace tomorrow.

Regards,
     Jonas

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Sent through GMX FreeMail - http://www.gmx.net

IdlePTD 3776512
initial pcb at 2fba20
panicstr: page fault
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x15
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc0253568
stack pointer           = 0x10:0xc7726e80
frame pointer           = 0x10:0xc7726e88
code segment            = base rx0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 11929 (pkg_info)
interrupt mask          = none
trap number             = 12
panic: page fault

syncing disks... 326 326 319 291 267 250 208 156 101 49
done
Uptime: 2h37m40s
0  boot (howto=256) at ../../kern/kern_shutdown.c:302
302                     dumppcb.pcb_cr3 = rcr3();
(kgdb) where
#0  boot (howto=256) at ../../kern/kern_shutdown.c:302
#1  0xc0159d68 in poweroff_wait (junk=0xc02cb90f, howto=-949032320)
    at ../../kern/kern_shutdown.c:552
#2  0xc0286485 in trap_fatal (frame=0xc7726e40, eva=21)
    at ../../i386/i386/trap.c:927
#3  0xc028615d in trap_pfault (frame=0xc7726e40, usermode=0, eva=21)
    at ../../i386/i386/trap.c:820
#4  0xc0285d2f in trap (frame={tf_fs = 16, tf_es = 16, tf_ds = 16,
      tf_edi = 672108544, tf_esi = 0, tf_ebp = -948801912,
      tf_isp = -948801940, tf_ebx = -947292192, tf_edx = 1, tf_ecx =
1239613,
      tf_eax = 33620, tf_trapno = 12, tf_err = 0, tf_eip = -1071303320,
      tf_cs = 8, tf_eflags = 66050, tf_esp = 0, tf_ss = -948884608})
    at ../../i386/i386/trap.c:426
#5  0xc0253568 in vm_page_lookup (object=0xc78977e0, pindex=0)
    at ../../vm/vm_page.c:501
#6  0xc024bf88 in vm_fault (map=0xc7712b80, vaddr=672108544,
    fault_type=3 '\003', fault_flags=8) at ../../vm/vm_fault.c:288
#7  0xc02860f2 in trap_pfault (frame=0xc7726fa8, usermode=1,
eva=672109440)
    at ../../i386/i386/trap.c:800
#8  0xc0285c2f in trap (frame={tf_fs = 47, tf_es = 47, tf_ds = 47,
      tf_edi = 671653972, tf_esi = 672109440, tf_ebp = -1077941788,
      tf_isp = -948801580, tf_ebx = 671485992, tf_edx = 671499008,
      tf_ecx = 671436340, tf_eax = 671600640, tf_trapno = 12, tf_err = 7,
      tf_eip = 671436346, tf_cs = 31, tf_eflags = 66050, tf_esp =
-1077941828,
      tf_ss = 47}) at ../../i386/i386/trap.c:349
#9  0x28054e3a in ?? ()
#10 0x28052ba0 in ?? ()
#11 0x280517ab in ?? ()

I'm not at all familiar with debugging, so you have to tell me which
frames I have to look at ;)

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Could you please tell us if you are still having this problem with
newer versions of FreeBSD?

DES
-- 
Dag-Erling Smorgrav - des@ofug.org

Comment 6 Sheldon Hearn 2002-01-17 16:12:05 UTC

State Changed
From-To: feedback->closed

Automatic feedback timeout.  If additional feedback that warrants 
the re-opening of this PR is available but not included in the 
audit trail, please include the feedback in a reply to this message 
(preserving the Subject line) and ask that the PR be re-opened.