Public bug reported:
I'm running some java tests which rely on the RXTX package for RS-232
serial communication. During the running of the tests I find that my
COM port gets reset, for what would seem, no apparent reason. I
recently switched to the server kernel so as to access the full 4GB of
RAM, but I don't think this has anything to do with it as I experienced
the same com port problem with the ordinary desktop kernel (for
intrepid).
I see this in the system logs, which doesn't look so good to me:
[124187.784129] WARNING: at
/build/buildd/linux-2.6.27/drivers/usb/serial/usb-serial.c:311
serial_write+0xa4/0xb0 [usbserial]()
[124187.784131] Modules linked in: usbhid hid ppp_deflate zlib_deflate bsd_comp
ppp_async crc_ccitt ppp_generic slhc option usb_storage libusual pl2303
usbserial i915 drm binfmt_misc rfcomm bridge stp bnep sco l2cap bluetooth ppdev
ipv6 acpi_cpufreq cpufreq_userspace cpufreq_ondemand cpufreq_stats
cpufreq_conservative freq_table cpufreq_powersave sbs sbshc pci_slot af_packet
iptable_filter ip_tables x_tables sbp2 lp joydev arc4 ecb crypto_blkcipher
evdev pcspkr serio_raw iwlagn iwlcore psmouse rfkill led_class mac80211
cfg80211 snd_hda_intel parport_pc parport snd_pcm_oss snd_mixer_oss snd_pcm
snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi tpm_infineon tpm tpm_bios
snd_seq_midi_event container snd_seq snd_timer snd_seq_device video output snd
battery wmi ac shpchp pci_hotplug soundcore button intel_agp agpgart
snd_page_alloc ext3 jbd mbcache sr_mod sd_mod cdrom crc_t10dif sg ahci tg3
ohci1394 libphy libata ieee1394 scsi_mod dock ehci_hcd uhci_hcd usbcore thermal
processor fan fbcon tileblit font bitblit softcursor fuse
[124187.784201] Pid: 9, comm: events/0 Tainted: G W 2.6.27-14-server #1
[124187.784203] [<c038c3eb>] ? printk+0x1d/0x22
[124187.784206] [<c0139619>] warn_on_slowpath+0x59/0x90
[124187.784212] [<c014bb66>] ? __queue_work+0x36/0x50
[124187.784215] [<c014bc0a>] ? queue_work_on+0x4a/0x60
[124187.784219] [<c014bd1a>] ? queue_work+0x1a/0x20
[124187.784222] [<c014bd34>] ? schedule_work+0x14/0x20
[124187.784225] [<f9222d82>] ? usb_serial_port_softint+0x12/0x20 [usbserial]
[124187.784231] [<f917941f>] ? pl2303_send+0xbf/0x1c0 [pl2303]
[124187.784236] [<f91796e4>] ? pl2303_buf_put+0x14/0xe0 [pl2303]
[124187.784240] [<f917980a>] ? pl2303_write+0x5a/0xa0 [pl2303]
[124187.784244] [<c012c238>] ? enqueue_entity+0xd8/0x2f0
[124187.784250] [<f9222714>] serial_write+0xa4/0xb0 [usbserial]
[124187.784255] [<c0256c55>] ? __next_cpu+0x15/0x30
[124187.784260] [<c02b0f73>] tty_put_char+0x33/0x40
[124187.784263] [<c02b550e>] echo_char+0x5e/0x80
[124187.784266] [<c02b6cbf>] n_tty_receive_char+0x11f/0x6f0
[124187.784269] [<c02b7524>] n_tty_receive_buf+0x294/0x530
[124187.784272] [<c025b3dd>] ? rb_erase+0xcd/0x150
[124187.784275] [<c012a75a>] ? __dequeue_entity+0x2a/0xb0
[124187.784279] [<c012a906>] ? set_next_entity+0x126/0x160
[124187.784283] [<c0108dc6>] ? __switch_to+0xa6/0x160
[124187.784286] [<c02b33f0>] ? flush_to_ldisc+0x0/0x1c0
[124187.784290] [<c02b902b>] ? tty_ldisc_try+0x3b/0x50
[124187.784293] [<c02b34e5>] flush_to_ldisc+0xf5/0x1c0
[124187.784296] [<c02b33f0>] ? flush_to_ldisc+0x0/0x1c0
[124187.784299] [<c014b325>] run_workqueue+0x95/0x160
[124187.784302] [<c014f2d6>] ? finish_wait+0x16/0x70
[124187.784306] [<c014b5c8>] worker_thread+0x88/0xf0
[124187.784309] [<c014f180>] ? autoremove_wake_function+0x0/0x50
[124187.784312] [<c014b540>] ? worker_thread+0x0/0xf0
[124187.784316] [<c014ee01>] kthread+0x41/0x80
[124187.784318] [<c014edc0>] ? kthread+0x0/0x80
[124187.784321] [<c010abe7>] kernel_thread_helper+0x7/0x10
[124187.784324] =======================
[124187.784326] ---[ end trace afca9dee5dd2a357 ]---
[124703.504295] hub 5-0:1.0: port 2 disabled by hub (EMI?), re-enabling...
[124703.504315] usb 5-2: USB disconnect, address 47
[124703.505513] pl2303 5-2:1.0: device disconnected
[124703.790059] usb 5-2: new full speed USB device using uhci_hcd and address 50
[124703.957191] usb 5-2: configuration #1 chosen from 1 choice
[124703.966996] pl2303 5-2:1.0: pl2303 converter detected
[124703.979075] usb 5-2: pl2303 converter now attached to ttyUSB3
** Affects: ubuntu
Importance: Undecided
Status: New
--
Re-enabling of the usb-serial converter
https://bugs.launchpad.net/bugs/426665
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