Public bug reported:
Binary package hint: linux-image
The above backtrace happens when I disconnect from a serial attached device.
The device was a cisco 2950 switch, attached with "cu -s 9600 -l ttyUSB0".
The USB-serial converterd is " Prolific Technology, Inc. PL2303 Serial Port"
(067b:2303).
Here's the backtrace :
[1266824.056023] ------------[ cut here ]------------
[1266824.056030] WARNING: at
/build/buildd/linux-2.6.27/drivers/usb/serial/usb-serial.c:324
serial_write_room+0x75/0x80 [usbserial]()
[1266824.056034] Modules linked in: irda crc_ccitt btusb pl2303 usbserial
nls_iso8859_1 nls_cp437 vfat fat usb_storage libusual usblp i915 drm
binfmt_misc rfcomm sco bnep l2cap bluetooth ipmi_msghandler tun kvm_intel kvm
ppdev acpi_cpufreq cpufreq_userspace cpufreq_powersave cpufreq_conservative
cpufreq_stats cpufreq_ondemand freq_table pci_slot sbs wmi video output
container sbshc battery af_packet bridge stp ipv6 iptable_filter ip_tables
x_tables ac coretemp w83627ehf hwmon_vid sbp2 parport_pc lp parport
snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy evdev snd_seq_oss
snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq serio_raw snd_timer psmouse
snd_seq_device snd intel_agp iTCO_wdt button agpgart iTCO_vendor_support shpchp
soundcore pcspkr pci_hotplug snd_page_alloc ext3 jbd mbcache sr_mod sd_mod
cdrom crc_t10dif usbhid hid pata_jmicron sg ata_generic ohci1394 atl1 ieee1394
mii pata_acpi ahci libata scsi_mod dock uhci_hcd ehci_hcd usbcore dm_mirror
dm_log dm_snapshot dm_mod thermal processor fan fbcon tileblit font bitblit
softcursor fuse
[1266824.056149] Pid: 15, comm: events/0 Not tainted 2.6.27-7-generic #1
[1266824.056153] [<c037c406>] ? printk+0x1d/0x1f
[1266824.056160] [<c0131de9>] warn_on_slowpath+0x59/0x90
[1266824.056169] [<c014b474>] ? hrtimer_start+0xc4/0x1c0
[1266824.056174] [<c012a571>] ? hrtick_start_fair+0x181/0x1a0
[1266824.056180] [<c012a21e>] ? resched_task+0x1e/0x70
[1266824.056185] [<c012ad55>] ? check_preempt_wakeup+0x175/0x1b0
[1266824.056190] [<c012b4ee>] ? try_to_wake_up+0xde/0x290
[1266824.056196] [<f91f4665>] serial_write_room+0x75/0x80 [usbserial]
[1266824.056203] [<c02a676d>] tty_write_room+0x1d/0x20
[1266824.056208] [<c02a421f>] opost+0x1f/0x260
[1266824.056213] [<c02a60ca>] n_tty_receive_char+0x54a/0x700
[1266824.056218] [<c02a64d8>] n_tty_receive_buf+0x258/0x4b0
[1266824.056222] [<c0129f97>] ? load_balance_newidle+0x97/0x270
[1266824.056228] [<c0102df6>] ? __switch_to+0xa6/0x160
[1266824.056233] [<c02a23a0>] ? flush_to_ldisc+0x0/0x1c0
[1266824.056238] [<c02a7f8b>] ? tty_ldisc_try+0x3b/0x50
[1266824.056243] [<c02a2496>] flush_to_ldisc+0xf6/0x1c0
[1266824.056248] [<c02a23a0>] ? flush_to_ldisc+0x0/0x1c0
[1266824.056253] [<c0143645>] run_workqueue+0x95/0x160
[1266824.056258] [<c0147576>] ? finish_wait+0x16/0x70
[1266824.056263] [<c01438e8>] worker_thread+0x88/0xf0
[1266824.056267] [<c01474b0>] ? autoremove_wake_function+0x0/0x50
[1266824.056272] [<c0143860>] ? worker_thread+0x0/0xf0
[1266824.056277] [<c0147141>] kthread+0x41/0x80
[1266824.056282] [<c0147100>] ? kthread+0x0/0x80
[1266824.056286] [<c0105297>] kernel_thread_helper+0x7/0x10
[1266824.056291] =======================
[1266824.056294] ---[ end trace 942a2a05a7ba0c26 ]---
[1266824.056300] ------------[ cut here ]------------
ProblemType: KernelOops
Architecture: i386
DistroRelease: Ubuntu 8.10
Package: linux-image-2.6.27-7-generic 2.6.27-7.16
ProcCmdLine: User Name=UUID=4f3d7f14-eeb7-4879-a04e-706a2d64a903 ro quiet
splash locale=fr_FR apparmor.enabled=0 selinux=1
ProcVersionSignature: Ubuntu 2.6.27-7.16-generic
SourcePackage: linux
Title: 4>[1266824.056544] WARNING: at
/build/buildd/linux-2.6.27/drivers/usb/serial/usb-serial.c:311
serial_write+0xa4/0xb0 [usbserial]()
** Affects: linux-ports-meta (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-kerneloops
--
4>[1266824.056544] WARNING: at
/build/buildd/linux-2.6.27/drivers/usb/serial/usb-serial.c:311
serial_write+0xa4/0xb0 [usbserial]()
https://bugs.launchpad.net/bugs/303815
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