Re: panic in recent 6-current

Pawel Worach wrote:
> Divacky Roman wrote:
> 
>> #22 0xc0493087 in softclock (dummy=0x0) at atomic.h:365
>> #23 0xc04768a3 in ithread_loop (arg=0xc1577480)
>>     at /usr/src/sys/kern/kern_intr.c:546
>> #24 0xc0475be9 in fork_exit (callout=0xc0476761 <ithread_loop>,
>>         arg=0xc1577480, frame=0xd3fc3d48) at 
>> /usr/src/sys/kern/kern_fork.c:790
>> #25 0xc057ef5c in fork_trampoline () at 
>> /usr/src/sys/i386/i386/exception.s:208
>>
> 
> I have seen the same thing but only these four frames in DDB, happened 
> during
> boot. I'll see if I can get a dump with it, my kernel is built with -O.
> 

It occurred right after enabling pf(4) on boot.

(kgdb) printf "%s", msgbufp->msg_ptr
...
<118>Feb  8 21:08:14 <kern.info> cookie kernel: pflog0: promiscuous mode enabled
pf: started
<118>pf enabled
altq: started


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x1c
---Type <return> to continue, or q <return> to quit---
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xc05222b7
stack pointer           = 0x10:0xe32f4c94
frame pointer           = 0x10:0xe32f4cd4
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         = 28 (swi4: clock sio)

(kgdb) bt
#0  doadump () at pcpu.h:159
#1  0xc046dbf5 in db_fncall (dummy1=0, dummy2=0, dummy3=1999, dummy4=0xe32f4a84 
" \uffffn\uffff\f") at /usr/src/sys/ddb/db_command.c:531
#2  0xc046d982 in db_command (last_cmdp=0xc06eb424, cmd_table=0x0, 
aux_cmd_tablep=0xc06be500, aux_cmd_tablep_end=0xc06be504)
     at /usr/src/sys/ddb/db_command.c:349
#3  0xc046da95 in db_command_loop () at /usr/src/sys/ddb/db_command.c:455
#4  0xc046fc15 in db_trap (type=12, code=0) at /usr/src/sys/ddb/db_main.c:221
#5  0xc0531a57 in kdb_trap (type=0, code=0, tf=0xe32f4c54) at 
/usr/src/sys/kern/subr_kdb.c:421
#6  0xc0673b04 in trap_fatal (frame=0xe32f4c54, eva=0) at 
/usr/src/sys/i386/i386/trap.c:801
#7  0xc06737f2 in trap_pfault (frame=0xe32f4c54, usermode=0, eva=28) at 
/usr/src/sys/i386/i386/trap.c:724
#8  0xc0673350 in trap (frame=
       {tf_fs = -483459048, tf_es = -1068367856, tf_ds = 16, tf_edi = 4, tf_esi 
= 6, tf_ebp = -483439404, tf_isp = -483439488, tf_ebx = 0, tf_edx = -701736880, 
tf_ecx = 21969, tf_eax = -1037546256, tf_trapno = 12, tf_err = 2, tf_eip = 
-1068358985, tf_cs = 8, tf_eflags = 66118, tf_esp = 0, tf_ss = 800582919}) at 
/usr/src/sys/i386/i386/trap.c:414
#9  0xc0663e4a in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#10 0xe32f0018 in ?? ()
#11 0xc0520010 in thread_exit () at /usr/src/sys/kern/kern_thread.c:615
#12 0xc04f9978 in ithread_loop (arg=0xc227a480) at /usr/src/sys/kern/kern_intr.c:546
#13 0xc04f887f in fork_exit (callout=0xc04f97d0 <ithread_loop>, arg=0x0, 
frame=0x0) at /usr/src/sys/kern/kern_fork.c:790
#14 0xc0663eac in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:208
(kgdb) l *0xc05222b7
0xc05222b7 is in softclock (atomic.h:154).
149     atomic.h: No such file or directory.
         in atomic.h
(kgdb) frame 12
#12 0xc04f9978 in ithread_loop (arg=0xc227a480) at /usr/src/sys/kern/kern_intr.c:546
546                                     ih->ih_handler(ih->ih_argument);
(kgdb) list
541                                             mtx_unlock(&ithd->it_lock);
542                                             goto restart;
543                                     }
544                                     if ((ih->ih_flags & IH_MPSAFE) == 0)
545                                             mtx_lock(&Giant);
546                                     ih->ih_handler(ih->ih_argument);
547                                     if ((ih->ih_flags & IH_MPSAFE) == 0)
548                                             mtx_unlock(&Giant);
549                             }
550
(kgdb) print *ih
$3 = {ih_handler = 0xc0522000 <softclock>, ih_argument = 0x0, ih_flags = 
-2147483648, ih_name = 0xc06b998b "clock",
   ih_ithread = 0xc227a480, ih_need = 1, ih_next = {tqe_next = 0xc23e7940, 
tqe_prev = 0xc227a4b0}, ih_pri = 52 '4'}

Frame #10 is strange, I'm fairly certain it was something like 
"softclock(0,0,0,0,0)" in the ddb trace unfortunetly IBM decided to put a
parallel port instead of a serial one on my ThinkPad so I can't capture
that easily. Kernel was built with -O according to
0>me_at_cookie /usr/obj/usr/src/sys/IBMT41> make -V CFLAGS
-O -pipe -march=pentium2 -Wall ...

config has SCHED_4BSD, PREEMPTION and ADAPTIVE_GIANT, no SMP, WITNESS or 
INVARIANTS. mpsafe{vfs,net,vm} is 1

What else is strange is that I have set
debug.debugger_on_panic=0
debug.trace_on_panic=1
in sysctl.conf but the box dropped to DDB on panic, shouldn't it dump
automagically with debug.debugger_on_panic set to 0 ?

-- 
Pawel