Re: ACPI causes page fault/panic upon reboot

John Baldwin wrote:

>Can you build a debug kernel, reproduce the panic, and then do a list
>from gdb on your kernel.debug of the instruction pointer?  For example,
>from the above you do:
>
>gdb -k kernel.debug
>l *0xc05fd8c5
>  
>
First I should say that turning off acpi seemed to fix the problem.  
However, the problem appears to be in dc0.

Ok, rebuilt my kernel with

makeoptions DEBUG=-g
options   DDB

Rebooted, did a trace when it went to the db prompt.:

***********************

Shutting down ACPI

Fatal trap 12: page fault while in kernel mode
fault virtual address    = 0x18
fault code                = supervisor write, page not present
instruction pointer        = 0x8:0xc0603bc5
stack pointer            = 0x10:0xd032cc90
frame pointer            = 0x10:0xd032ccc0
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            = 19 (irq9: rl0 dc0 acpi0)
kernel: type 12 trap, code=0
Stopped at        dc_rxeof+0x1b5: movl    %edx,0x18(%eax)

db>trace

dc_rxeof(c33bb000,0,c0700bbe,c43,c33bb000) at dc_rxeof+0x1b5
dc_intr(c33bb000,0,c06f4d21,21f,c333d388) at dc_intr+0x100
ithread_loop(c1843980,d032cd48,c06f4be6,311,0) at ithread_loop+0x162
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xd032cd7c, ebp = 0 ---

*****************

Did a gdb -k kernel.debug, and listed the code:

*****************

(kgdb) l *0xc0603bc5
0xc0603bc5 is in dc_rxeof (../../../pci/if_dc.c:2804).
2799                     * If we are on an architecture with alignment 
problems, or
2800                     * if the allocation fails, then use m_devget 
and leave the
2801                     * existing buffer in the receive ring.
2802                     */
2803                    if (dc_quick && dc_newbuf(sc, i, 1) == 0) {
2804                            m->m_pkthdr.rcvif = ifp;
2805                            m->m_pkthdr.len = m->m_len = total_len;
2806                            DC_INC(i, DC_RX_LIST_CNT);
2807                    } else
2808    #endif

*****************

I hope this helps.

-Dan