Seen that myself today:

[440927.296832] ------------[ cut here ]------------
[440927.296838] WARNING: at 
/build/buildd-linux-2.6_2.6.32-35squeeze2-amd64-OT816k/linux-2.6-2.6.32/debian/build/source_amd64_none/drivers/usb/serial/usb-serial.c:440
 serial_unthrottle+0x53/0x77 [usbserial]()
[440927.296840] Hardware name:
[440927.296841] Modules linked in: nfs lockd fscache nfs_acl auth_rpcgss sunrpc 
ftdi_sio usbserial sco bnep rfcomm l2cap crc16 bluetooth rfkill 8021q garp 
bridge stp vboxnetadp vboxnetflt vboxdrv autofs4 fuse usbhid hid uhci_hcd 
ohci_hcd snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm 
snd_timer nvidia(P) snd soundcore snd_page_alloc i2c_i801 i2c_core psmouse 
pcspkr evdev serio_raw button processor shpchp pci_hotplug usb_storage ext3 jbd 
mbcache dm_mod raid1 md_mod sg sr_mod sd_mod cdrom crc_t10dif ahci libata 
scsi_mod xhci ehci_hcd firewire_ohci usbcore firewire_core nls_base crc_itu_t 
e1000e thermal thermal_sys [last unloaded: scsi_wait_scan]
[440927.296869] Pid: 5892, comm: sermon Tainted: P           2.6.32-5-amd64 #1
[440927.296870] Call Trace:
[440927.296874]  [<ffffffffa01ad5d9>] ? serial_unthrottle+0x53/0x77 [usbserial]
[440927.296876]  [<ffffffffa01ad5d9>] ? serial_unthrottle+0x53/0x77 [usbserial]
[440927.296879]  [<ffffffff8104df1c>] ? warn_slowpath_common+0x77/0xa3
[440927.296882]  [<ffffffffa01ad5d9>] ? serial_unthrottle+0x53/0x77 [usbserial]
[440927.296885]  [<ffffffff811fd9f3>] ? tty_unthrottle+0x3c/0x47
[440927.296887]  [<ffffffff811fc747>] ? n_tty_flush_buffer+0xc/0x68
[440927.296889]  [<ffffffff811ff331>] ? tty_ldisc_flush+0x27/0x3e
[440927.296891]  [<ffffffff811ffb50>] ? tty_port_close_end+0x18/0xb9
[440927.296893]  [<ffffffffa01ad9b2>] ? serial_close+0x78/0x92 [usbserial]
[440927.296895]  [<ffffffff811fa43e>] ? tty_release_dev+0x1b5/0x4b9
[440927.296897]  [<ffffffff81064e37>] ? bit_waitqueue+0x10/0xa0
[440927.296899]  [<ffffffff811fa753>] ? tty_release+0x11/0x1a
[440927.296902]  [<ffffffff810efc05>] ? __fput+0x100/0x1af
[440927.296904]  [<ffffffff810ed06a>] ? filp_close+0x5b/0x62
[440927.296906]  [<ffffffff8104fa20>] ? put_files_struct+0x64/0xc1
[440927.296907]  [<ffffffff810512e5>] ? do_exit+0x236/0x6c6
[440927.296910]  [<ffffffff812faef0>] ? thread_return+0x79/0xe0
[440927.296912]  [<ffffffff810517eb>] ? do_group_exit+0x76/0x9d
[440927.296914]  [<ffffffff8105e0d7>] ? get_signal_to_deliver+0x310/0x339
[440927.296917]  [<ffffffff8101004f>] ? do_notify_resume+0x87/0x73f
[440927.296919]  [<ffffffff811f95a9>] ? tty_write+0x20b/0x226
[440927.296921]  [<ffffffff811f95a9>] ? tty_write+0x20b/0x226
[440927.296922]  [<ffffffff811fba93>] ? n_tty_write+0x0/0x349
[440927.296924]  [<ffffffff810ef32c>] ? vfs_write+0xa9/0x102
[440927.296926]  [<ffffffff81010e0e>] ? int_signal+0x12/0x17
[440927.296927] ---[ end trace ba41fc8150648a41 ]---

'sermon' is a minicom-like application.

I searched for references and found:

http://linux.derkeiler.com/Mailing-Lists/Kernel/2009-10/msg07056.html
(Alan Cox: "Looks like a very very old bug in the tty code")

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/625893

Mentioned here too:
http://e2e.ti.com/support/embedded/f/509/p/132474/476895.aspx


Cheers,

-- 
Cristian



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