panic when printing

I haven't seen this reported before.

Trying to print to my parallel printer with a -current kernel from July
2 (amd64) results in a kernel panic. A kernel from June 16 (i386) does
not cause a panic.

If I boot with the printer turned on then the kernel sees it (PnP)
with no problem. Just printing causes a panic.

BTW this kernel is using the SMP-scheduler from Jeff Roberson, but
IIRC a different kernel (June 29) w/o that scheduler also panics.

I can't say whether it's amd64-specific or just due to recent changes to
the sources. I'm rather reluctant to generate a new i386 kernel to check
that, but I could be persuaded to do it.

Below a typescript of a very limited kgdb session:

root:peedub:crash:bash:1> gdb /boot/kernel/kernel vmcore.1
[GDB will not be able to debug user-mode
threads: /usr/lib/libthread_db.so: Undefined symbol
"ps_pglobal_lookup"] GNU gdb 6.1.1 [FreeBSD] Copyright 2004 Free
Software Foundation, Inc. GDB is free software, covered by the GNU
General Public License, and you are welcome to change it and/or
distribute copies of it under certain conditions. Type "show copying"
to see the conditions. There is absolutely no warranty for GDB.  Type
"show warranty" for details. This GDB was configured as
"amd64-marcel-freebsd".

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


Fatal trap 30: reserved (unknown) fault while in kernel mode
cpuid = 1; apic id = 01
instruction pointer	= 0x8:0xffffffff804ece83
stack pointer	        = 0x10:0xffffffffaf97a760
frame pointer	        = 0x10:0xffffffffaf97a780
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		= 1980 (lpd)
trap number		= 30
panic: reserved (unknown) fault
cpuid = 1
Uptime: 2h41m43s
Physical memory: 2037 MB
Dumping 977 MB: 961 945 929 913 897 881 865 849 833 817 801 785 769 753
737 721 705 689 673 657 641 625 609 593 577 561 545 529 513 497 481 465
449 433 417 401 385 369 353 337 321 305 289 273 257 241 225 209 193 177
161 145 129 113 97 81 65 49 33 17 1

#0  doadump () at pcpu.h:194
194	pcpu.h: No such file or directory.
	in pcpu.h
(kgdb) bt
#0  doadump () at pcpu.h:194
#1  0xffffffff802f94db in boot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xffffffff802f97de in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xffffffff804fec9c in trap_fatal (frame=0xffffffffaf97a6b0, eva=0)
    at /usr/src/sys/amd64/amd64/trap.c:695
#4  0xffffffff804ffaa3 in trap (frame=0xffffffffaf97a6b0)
    at /usr/src/sys/amd64/amd64/trap.c:498
#5  0xffffffff804e566e in calltrap ()
    at /usr/src/sys/amd64/amd64/exception.S:169
#6  0xffffffff804ece83 in spinlock_exit () at cpufunc.h:391
#7  0xffffffff804e9291 in ioapic_program_intpin
#(intpin=0xffffff0001043208)
    at /usr/src/sys/amd64/amd64/io_apic.c:273
#8  0xffffffff804e967a in ioapic_disable_intr (isrc=0xffffff0001043208)
    at /usr/src/sys/amd64/amd64/io_apic.c:375
#9  0xffffffff804e843d in intr_remove_handler (cookie=Variable "cookie"
#is not available.
)
    at /usr/src/sys/amd64/amd64/intr_machdep.c:217
#10 0xffffffff804f23bc in nexus_teardown_intr (dev=Variable "dev" is
#not available.
)
    at /usr/src/sys/amd64/amd64/nexus.c:451
#11 0xffffffff8031bf8f in bus_generic_teardown_intr
#(dev=0xffffffffabf30000, 
    child=0xffffff0003285b00, irq=0xffffff0003316480, 
    cookie=0xffffff001bf44100) at bus_if.h:416
#12 0xffffffff8022fc9d in ppc_teardown_intr (bus=0xffffff0001216500, 
    child=0xffffff0003285b00, r=0xffffff0003316480,
ih=0xffffff001bf44100) at bus_if.h:416
#13 0xffffffff8022e3f4 in ppbus_teardown_intr (bus=0xffffff0003286e00, 
    child=0xffffff0003285b00, r=Variable "r" is not available.
) at bus_if.h:416
#14 0xffffffff8022ef6a in ppb_release_bus (bus=0xffffff0003286e00, 
    dev=0xffffff0003285b00) at bus_if.h:416
#15 0xffffffff8022a9a5 in lpt_release_ppbus (dev=0xffffff0003285b00)
    at /usr/src/sys/dev/ppbus/lpt.c:227
#16 0xffffffff8022b796 in lptwrite (dev=Variable "dev" is not available.
) at /usr/src/sys/dev/ppbus/lpt.c:826
#17 0xffffffff802c6f61 in giant_write (dev=0xffffff00032fe800, 
    uio=0xffffffffaf97ab00, ioflag=0)
at /usr/src/sys/kern/kern_conf.c:358
#18 0xffffffff8028b9f7 in devfs_write_f (fp=0xffffff0003b092d0, 
    uio=0xffffffffaf97ab00, cred=Variable "cred" is not available.
) at /usr/src/sys/fs/devfs/devfs_vnops.c:1290
#19 0xffffffff8033058a in dofilewrite (td=0xffffff00039c5360, fd=6, 
    fp=0xffffff0003b092d0, auio=0xffffffffaf97ab00, offset=Variable
"offset" is not available. ) at file.h:254
#20 0xffffffff8033080f in kern_writev (td=0xffffff00039c5360, fd=6, 
    auio=0xffffffffaf97ab00) at /usr/src/sys/kern/sys_generic.c:373
#21 0xffffffff8033088b in write (td=0xffffffffabf30000, uap=0x1e)
    at /usr/src/sys/kern/sys_generic.c:303
#22 0xffffffff804ff2d1 in syscall (frame=0xffffffffaf97ac70)
    at /usr/src/sys/amd64/amd64/trap.c:820
#23 0xffffffff804e581b in Xfast_syscall ()
    at /usr/src/sys/amd64/amd64/exception.S:272
#24 0x000000080071ccac in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb) q

--- 
Gary Jennejohn / garyjATjennejohnDOTorg gjATfreebsdDOTorg
garyjATdenxDOTde