Re: Parallel port printing crashes 7.0 system

On Mon, 24 Sep 2007, bruce_at_cran.org.uk wrote:

> On Mon, Sep 24, 2007 at 06:36:53PM +0200, P.U.Kruppa wrote:
>> Sorry, from developer's handbook I guess I should find a vmcore.N
>> file. There isn't any. My parallel printing attempts end up in
>> some kind of single user mode on the root terminal with a
>> 	db>
>> prompt. Can I do anything with that?
>>
>
> That's the DDB prompt: from there you need to either get a backtrace or,
> more usefully, generate a crash dump.
>
> To generate a crash dump that you can later use with kgdb, type "panic"
> at the db> prompt.
Ah yes, now I get a nice vmcore.0 (I placed it it /usr , since I 
didn't know if my /var is big enough)

So now:
 	--------------------------------------------
pukruppa# cd /usr/obj/usr/src/sys/SMALLD/
pukruppa# kgdb kernel.debug /usr/vmcore.0
[GDB will not be able to debug user-mode threads: 
/usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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This GDB was configured as "amd64-marcel-freebsd".

Unread portion of the kernel message buffer:
lpt0: [GIANT-LOCKED]
lpt0: [ITHREAD]


Fatal trap 30: reserved (unknown) fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer     = 0x8:0xffffffff806e21f3
stack pointer           = 0x10:0xffffffffaeb2f840
frame pointer           = 0x10:0xffffffffaeb2f860
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, IOPL = 0
current process         = 1348 (parallel)
panic: from debugger
cpuid = 0
Uptime: 8h3m19s
Physical memory: 2034 MB
Dumping 317 MB: 302 286 270 254 238 222 206 190 174 158 142 126 
110 94 78 62 46 30 14

#0  doadump () at pcpu.h:194
194             __asm __volatile("movq %%gs:0,%0" : "=r" (td));
(kgdb) backtrace
#0  doadump () at pcpu.h:194
#1  0xffffffff80476b35 in boot (howto=260)
     at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xffffffff80476fa7 in panic (fmt=Variable "fmt" is not 
available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xffffffff801ba067 in db_panic (addr=Variable "addr" is not 
available.
) at /usr/src/sys/ddb/db_command.c:433
#4  0xffffffff801ba94c in db_command_loop ()
     at /usr/src/sys/ddb/db_command.c:401
#5  0xffffffff801bc39f in db_trap (type=Variable "type" is not 
available.
) at /usr/src/sys/ddb/db_main.c:222
#6  0xffffffff8049de55 in kdb_trap (type=30, code=0, 
tf=0xffffffffaeb2f790)
     at /usr/src/sys/kern/subr_kdb.c:502
#7  0xffffffff806f1f7d in trap_fatal (frame=0xffffffffaeb2f790, 
eva=Variable "eva" is not available.
)
     at /usr/src/sys/amd64/amd64/trap.c:692
#8  0xffffffff806f2aa0 in trap (frame=0xffffffffaeb2f790)
     at /usr/src/sys/amd64/amd64/trap.c:499
#9  0xffffffff806d933e in calltrap ()
     at /usr/src/sys/amd64/amd64/exception.S:169
#10 0xffffffff806e21f3 in spinlock_exit () at cpufunc.h:391
#11 0xffffffff806dd135 in ioapic_disable_intr 
(isrc=0xffffff000104c208)
     at /usr/src/sys/amd64/amd64/io_apic.c:375
#12 0xffffffff806dc00d in intr_remove_handler (cookie=Variable 
"cookie" is not available.
)
     at /usr/src/sys/amd64/amd64/intr_machdep.c:217
#13 0xffffffff8037c49a in ppc_teardown_intr 
(bus=0xffffff00012aac00,
     child=0xffffff0001637e00, r=0xffffff000165cd80, 
ih=0xffffff00121f4780)
     at bus_if.h:416
#14 0xffffffff8037b81a in ppb_release_bus 
(bus=0xffffff0001637800,
     dev=0xffffff0001637e00) at bus_if.h:416
#15 0xffffffff80377635 in lpt_release_ppbus 
(dev=0xffffff0001637e00)
     at /usr/src/sys/dev/ppbus/lpt.c:227
#16 0xffffffff8037801c in lptwrite (dev=Variable "dev" is not 
available.
) at /usr/src/sys/dev/ppbus/lpt.c:826
#17 0xffffffff80448941 in giant_write (dev=0xffffff000165fa00,
     uio=0xffffffffaeb2faf0, ioflag=0) at 
/usr/src/sys/kern/kern_conf.c:373
#18 0xffffffff8040e8cc in devfs_write_f (fp=0xffffff003ec6b528,
     uio=0xffffffffaeb2faf0, cred=Variable "cred" is not 
available.
) at /usr/src/sys/fs/devfs/devfs_vnops.c:1304
#19 0xffffffff804b02f5 in dofilewrite (td=0xffffff00019bd340, 
fd=4,
     fp=0xffffff003ec6b528, auio=0xffffffffaeb2faf0, 
offset=Variable "offset" is not available.
) at file.h:254
#20 0xffffffff804b058c in kern_writev (td=0xffffff00019bd340, 
fd=4,
     auio=0xffffffffaeb2faf0) at 
/usr/src/sys/kern/sys_generic.c:401
#21 0xffffffff804b0604 in write (td=Variable "td" is not 
available.
) at /usr/src/sys/kern/sys_generic.c:317
#22 0xffffffff806f24ce in syscall (frame=0xffffffffaeb2fc70)
     at /usr/src/sys/amd64/amd64/trap.c:822
#23 0xffffffff806d94eb in Xfast_syscall ()
     at /usr/src/sys/amd64/amd64/exception.S:272
#24 0x00000008010bbfbc in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)

 	-----------------------------------------------------


> Then, read
> to find out how to obtain a backtrace that can help diagnose the fault.
I hope that's it.

> --
> Bruce
>
Greetings,

Uli.


Peter Ulrich Kruppa
Wuppertal
Germany