Public bug reported:
Dear Ubuntuers,
In order to continuously take some data via a usb-serial adaptor,
I am using a netbook with Ubuntu 10.04;
Description: Ubuntu 10.04 LTS
Release: 10.04.
The usb-serial is composed of FT232RL, and successfully
attached to the netbook. However, occasionally, the use-serial
adopter is automatically disconnected and hence data-taking stops.
The occurrence rate of the disconnection is different from case-by-case;
in some case 1 per a few hours, and in another case 1 per 15 days.
I do not understand why the usb-serial adopter is abruptly disconnected,
and whether this disconnection is really due to ubuntu bug or not.
The following is a message given by dmesg;
[1308411.960414] ------------[ cut here ]------------
[1308411.960428] kernel BUG at
/build/buildd/linux-2.6.32/drivers/char/tty_ldisc.c:707!
[1308411.960440] invalid opcode: 0000 [#1] SMP
[1308411.960455] last sysfs file:
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0A:00/power_supply/C1C0/voltage_now
[1308411.960468] Modules linked in: binfmt_misc rfcomm ppdev sco
snd_hda_codec_analog bridge stp bnep l2cap fbcon tileblit font bitblit
softcursor vga16fb vgastate snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss
snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi
snd_seq_midi_event joydev snd_seq i915 snd_timer snd_seq_device drm_kms_helper
uvcvideo hp_accel lib80211_crypt_tkip ftdi_sio btusb videodev v4l1_compat
bluetooth snd drm usbserial psmouse intel_agp serio_raw wl(P) lis3lv02d
input_polldev soundcore lib80211 i2c_algo_bit led_class agpgart snd_page_alloc
video output lp parport ahci sky2
[1308411.960663]
[1308411.960678] Pid: 30, comm: khubd Tainted: P (2.6.32-22-generic
#36-Ubuntu) HP 2140
[1308411.960692] EIP: 0060:[<c03b9fc3>] EFLAGS: 00010202 CPU: 1
[1308411.960713] EIP is at tty_ldisc_reinit+0x43/0x50
[1308411.960724] EAX: ffffffea EBX: f337e800 ECX: 00000002 EDX: 00000002
[1308411.960736] ESI: 000000d8 EDI: f337e814 EBP: f71dfd98 ESP: f71dfd90
[1308411.960748] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[1308411.960762] Process khubd (pid: 30, ti=f71de000 task=f71b2670
task.ti=f71de000)
[1308411.960772] Stack:
[1308411.960778] f337e800 00000000 f71dfdb0 c03ba176 00000001 f337e940
f337e940 f337e800
[1308411.960807] <0> f71dfdd8 c03b2c22 00000000 c058b5ff 00000000 00000286
00000001 f337e800
[1308411.960837] <0> f2cde400 00000000 f71dfde0 c03b2e72 f71dfe0c f831e51c
00000058 00000002
[1308411.960870] Call Trace:
[1308411.960890] [<c03ba176>] ? tty_ldisc_hangup+0x1a6/0x1e0
[1308411.960907] [<c03b2c22>] ? do_tty_hangup+0x112/0x350
[1308411.960925] [<c058b5ff>] ? _spin_lock_irqsave+0x2f/0x50
[1308411.960941] [<c03b2e72>] ? tty_vhangup+0x12/0x20
[1308411.960977] [<f831e51c>] ? usb_serial_disconnect+0x8c/0x170 [usbserial]
[1308411.961001] [<c044a279>] ? usb_unbind_interface+0xe9/0x130
[1308411.961024] [<c03e6611>] ? __device_release_driver+0x51/0xb0
[1308411.961042] [<c03e6735>] ? device_release_driver+0x25/0x40
[1308411.961059] [<c03e59eb>] ? bus_remove_device+0x7b/0xa0
[1308411.961076] [<c03e3e67>] ? device_del+0xf7/0x180
[1308411.961093] [<c0447025>] ? usb_disable_device+0x85/0x100
[1308411.961111] [<c0441abe>] ? usb_disconnect+0x9e/0x120
[1308411.961128] [<c044201b>] ? hub_port_connect_change+0x8b/0x850
[1308411.961148] [<c0442f85>] ? hub_events+0x1f5/0x510
[1308411.961167] [<c01678af>] ? finish_wait+0x4f/0x70
[1308411.961183] [<c04432da>] ? hub_thread+0x3a/0x140
[1308411.961200] [<c0167740>] ? autoremove_wake_function+0x0/0x50
[1308411.961217] [<c04432a0>] ? hub_thread+0x0/0x140
[1308411.961232] [<c01674b4>] ? kthread+0x74/0x80
[1308411.961247] [<c0167440>] ? kthread+0x0/0x80
[1308411.961264] [<c0104087>] ? kernel_thread_helper+0x7/0x10
[1308411.961274] Code: 28 e8 c2 fb ff ff 89 f0 c7 43 28 00 00 00 00 e8 94 fe ff
ff 3d 00 f0 ff ff 77 10 89 43 28 89 f2 89 d8 e8 b1 fa ff ff 5b 5e 5d c3 <0f> 0b
eb fe 89 f6 8d bc 27 00 00 00 00 55 89 e5 57 56 53 83 ec
[1308411.961440] EIP: [<c03b9fc3>] tty_ldisc_reinit+0x43/0x50 SS:ESP
0068:f71dfd90
[1308411.961509] ---[ end trace 66bbe8ddc8bc71a4 ]---
** Affects: linux-backports-modules-2.6.31 (Ubuntu)
Importance: Undecided
Status: New
--
kernel BUG at /build/buildd/linux-2.6.32/drivers/char/tty_ldisc.c:707!
https://bugs.launchpad.net/bugs/613700
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