fyi

Linux zafir 2.6.29.6-smp #2 SMP Mon Aug 17 00:52:54 CDT 2009 i686 Intel(R) Atom(TM) CPU  230   @ 1.60GHz GenuineIntel GNU/Linux

slackware-version:Slackware 13.0.0.0.0

This is perl, v5.10.0 built for i486-linux-thread-multi

...and when you unplug the usb cable from the linux box

Apr 10 19:03:11 zafir kernel: BUG: unable to handle kernel NULL pointer dereference at (null)
Apr 10 19:03:11 zafir kernel: IP: [<c07a7238>] _spin_lock_irqsave+0x8/0x20
Apr 10 19:03:11 zafir kernel: *pde = 00000000 
Apr 10 19:03:11 zafir kernel: Oops: 0002 [#1] SMP 
Apr 10 19:03:11 zafir kernel: last sysfs file: /sys/devices/pci0000:00/0000:00:04.0/usb2/2-6/2-6:1.0/ttyUSB0/tty/ttyUSB0/dev
Apr 10 19:03:11 zafir kernel: Modules linked in: pl2303 usbserial snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss ipv6 pcmcia pcmcia_core agpgart ppdev lp parport_pc parport fuse snd_hda_codec_nvhdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec rfkill snd_hwdep snd_pcm snd_timer snd thermal rtc_cmos rtc_core led_class soundcore psmouse rtc_lib processor thermal_sys hwmon wmi button sg snd_page_alloc serio_raw shpchp evdev forcedeth [last unloaded: pcmcia_core]
Apr 10 19:03:11 zafir kernel: 
Apr 10 19:03:11 zafir kernel: Pid: 1180, comm: screen Not tainted (2.6.29.6-smp #2) Aspire R1600
Apr 10 19:03:11 zafir kernel: EIP: 0060:[<c07a7238>] EFLAGS: 00010046 CPU: 0
Apr 10 19:03:11 zafir kernel: EIP is at _spin_lock_irqsave+0x8/0x20
Apr 10 19:03:11 zafir kernel: EAX: 00000000 EBX: f84f5ca0 ECX: 00000100 EDX: 00000246
Apr 10 19:03:11 zafir kernel: ESI: 00000000 EDI: f2ebb254 EBP: f2ebb200 ESP: d7e15e4c
Apr 10 19:03:11 zafir kernel:  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Apr 10 19:03:11 zafir kernel: Process screen (pid: 1180, ti=d7e14000 task=cff26d80 task.ti=d7e14000)
Apr 10 19:03:11 zafir kernel: Stack:
Apr 10 19:03:11 zafir kernel:  f84f3bb7 d7e15e80 c019d5ae d7e15e68 bfd97994 d7e15e68 cfda8000 00000050
Apr 10 19:03:11 zafir kernel:  00000000 00000000 00000040 00000000 00000000 f84f5ca0 f2ebb200 f2ebb254
Apr 10 19:03:11 zafir kernel:  e7759120 f84e5ee5 c019a656 ffffffff ffffffff cfda8000 e77fe900 cfda8000
Apr 10 19:03:11 zafir kernel: Call Trace:
Apr 10 19:03:11 zafir kernel:  [<f84f3bb7>] pl2303_close+0x27/0x220 [pl2303]
Apr 10 19:03:11 zafir kernel:  [<c019d5ae>] core_sys_select+0x24e/0x2f0
Apr 10 19:03:11 zafir kernel:  [<f84e5ee5>] serial_close+0x165/0x1a0 [usbserial]
Apr 10 19:03:11 zafir kernel:  [<c019a656>] fasync_helper+0x26/0x100
Apr 10 19:03:11 zafir kernel:  [<c041f9de>] tty_fasync+0x3e/0x110
Apr 10 19:03:11 zafir kernel:  [<c0421fc0>] tty_release_dev+0x160/0x500
Apr 10 19:03:11 zafir kernel:  [<c013d923>] remove_wait_queue+0x13/0x40
Apr 10 19:03:11 zafir kernel:  [<c0424126>] n_tty_read+0x306/0x720
Apr 10 19:03:11 zafir kernel:  [<c0191180>] base_probe+0x10/0x40
Apr 10 19:03:11 zafir kernel:  [<c012053e>] __wake_up+0x3e/0x60
Apr 10 19:03:11 zafir kernel:  [<c042236f>] tty_release+0xf/0x20
Apr 10 19:03:11 zafir kernel:  [<c018f8df>] __fput+0x9f/0x1a0
Apr 10 19:03:11 zafir kernel:  [<c018c6d7>] filp_close+0x47/0x80
Apr 10 19:03:11 zafir kernel:  [<c018c785>] sys_close+0x75/0xc0
Apr 10 19:03:11 zafir kernel:  [<c01033ae>] syscall_call+0x7/0xb
Apr 10 19:03:11 zafir kernel:  [<c07a0000>] get_cpu_leaves+0x86/0x198
Apr 10 19:03:11 zafir kernel: Code: c9 89 c8 c3 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 90 f0 83 28 01 79 05 e8 35 ff ff ff c3 8d 74 26 00 9c 5a fa b9 00 01 00 00 <f0> 66 0f c1 08 38 e9 74 06 f3 90 8a 08 eb f6 89 d0 c3 8d b6 00 
Apr 10 19:03:11 zafir kernel: EIP: [<c07a7238>] _spin_lock_irqsave+0x8/0x20 SS:ESP 0068:d7e15e4c
Apr 10 19:03:11 zafir kernel: ---[ end trace 775d9ddd0f8bd3a2 ]---