This is still an ongoing issue for me.
Ubuntu 10.04.3 LTS
Linux shrapnel 2.6.32-38-generic #83-Ubuntu SMP Wed Jan 4 11:13:04 UTC 2012
i686 GNU/Linux
The Device is a Generic PL2303 USB to Serial Adapter:
Bus 005 Device 003: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x067b Prolific Technology, Inc.
idProduct 0x2303 PL2303 Serial Port
bcdDevice 2.02
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x000a 1x 10 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
[20851.489301] ------------[ cut here ]------------
[20851.489344] WARNING: at
/build/buildd/linux-2.6.32/drivers/usb/serial/usb-serial.c:440
serial_unthrottle+0x7c/0x80 [usbserial]()
[20851.489348] Hardware name: Unknown
[20851.489350] Modules linked in: xfs iptable_filter ip_tables x_tables
binfmt_misc pci_stub vboxpci vboxnetadp vboxnetflt vboxdrv w83627hf_wdt nfsd
exportfs nfs lockd nfs_acl auth_rpcgss sunrpc snd_emu10k1_synth snd_emux_synth
snd_seq_virmidi snd_seq_midi_emul snd_emu10k1 snd_ac97_codec ac97_bus
snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_util_mem snd_hwdep
snd_seq_dummy w83781d snd_seq_oss snd_seq_midi w83627hf hwmon_vid snd_rawmidi
fbcon tileblit snd_seq_midi_event font snd_seq cfi_cmdset_0002 pl2303 snd_timer
snd_seq_device bitblit usbserial snd softcursor jedec_probe emu10k1_gp
nvidia(P) vga16fb soundcore vgastate gameport shpchp ppdev amd_k7_agp
i2c_amd756 cfi_probe gen_probe cfi_util parport_pc agpgart amd_rng amd76xrom
mtd chipreg map_funcs lp parport sbp2 raid10 raid456 async_raid6_recov async_pq
usbhid hid raid6_pq async_xor xor async_memcpy async_tx raid1 ohci1394 3c59x
raid0 ieee1394 pata_amd mii multipath 3w_9xxx linear
[20851.489437] Pid: 14650, comm: megatunix Tainted: P W
2.6.32-38-generic #83-Ubuntu
[20851.489441] Call Trace:
[20851.489458] [<c014d202>] warn_slowpath_common+0x72/0xa0
[20851.489465] [<f814f5ec>] ? serial_unthrottle+0x7c/0x80 [usbserial]
[20851.489471] [<f814f5ec>] ? serial_unthrottle+0x7c/0x80 [usbserial]
[20851.489477] [<c014d24a>] warn_slowpath_null+0x1a/0x20
[20851.489482] [<f814f5ec>] serial_unthrottle+0x7c/0x80 [usbserial]
[20851.489492] [<c05911df>] ? _spin_lock_irqsave+0x2f/0x50
[20851.489496] [<c0590049>] ? mutex_lock+0x19/0x40
[20851.489504] [<c03bc2db>] tty_unthrottle+0x3b/0x50
[20851.489508] [<c03ba39e>] reset_buffer_flags+0xbe/0xf0
[20851.489512] [<c03ba3eb>] n_tty_flush_buffer+0x1b/0x80
[20851.489517] [<c03bd8cc>] tty_ldisc_flush+0x2c/0x50
[20851.489523] [<c03be900>] tty_port_close_end+0x20/0xe0
[20851.489529] [<f814fbda>] serial_close+0x6a/0xb0 [usbserial]
[20851.489533] [<c03b5a73>] ? tty_fasync+0x43/0x140
[20851.489537] [<c03b7d20>] tty_release_dev+0x120/0x4e0
[20851.489544] [<c013b115>] ? __wake_up+0x45/0x60
[20851.489548] [<c03bd595>] ? put_ldisc+0x55/0xb0
[20851.489558] [<c01ef85c>] ? anon_vma_unlink+0x6c/0x70
[20851.489564] [<c01f380b>] ? free_pages_and_swap_cache+0x8b/0xc0
[20851.489568] [<c03b80f7>] tty_release+0x17/0x30
[20851.489573] [<c020baff>] __fput+0xdf/0x1f0
[20851.489576] [<c020bc2d>] fput+0x1d/0x30
[20851.489586] [<c020816c>] filp_close+0x4c/0x80
[20851.489590] [<c0208215>] sys_close+0x75/0xc0
[20851.489595] [<c01033ec>] syscall_call+0x7/0xb
[20851.489599] ---[ end trace 90883237ae7ca2ff ]---
[20644.989196] ------------[ cut here ]------------
[20644.989250] WARNING: at
/build/buildd/linux-2.6.32/drivers/usb/serial/usb-serial.c:440
serial_unthrottle+0x7c/0x80 [usbserial]()
[20644.989255] Hardware name: Unknown
[20644.989257] Modules linked in: xfs iptable_filter ip_tables x_tables
binfmt_misc pci_stub vboxpci vboxnetadp vboxnetflt vboxdrv w83627hf_wdt nfsd
exportfs nfs lockd nfs_acl auth_rpcgss sunrpc snd_emu10k1_synth snd_emux_synth
snd_seq_virmidi snd_seq_midi_emul snd_emu10k1 snd_ac97_codec ac97_bus
snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_util_mem snd_hwdep
snd_seq_dummy w83781d snd_seq_oss snd_seq_midi w83627hf hwmon_vid snd_rawmidi
fbcon tileblit snd_seq_midi_event font snd_seq cfi_cmdset_0002 pl2303 snd_timer
snd_seq_device bitblit usbserial snd softcursor jedec_probe emu10k1_gp
nvidia(P) vga16fb soundcore vgastate gameport shpchp ppdev amd_k7_agp
i2c_amd756 cfi_probe gen_probe cfi_util parport_pc agpgart amd_rng amd76xrom
mtd chipreg map_funcs lp parport sbp2 raid10 raid456 async_raid6_recov async_pq
usbhid hid raid6_pq async_xor xor async_memcpy async_tx raid1 ohci1394 3c59x
raid0 ieee1394 pata_amd mii multipath 3w_9xxx linear
[20644.989347] Pid: 12151, comm: megatunix Tainted: P W
2.6.32-38-generic #83-Ubuntu
[20644.989350] Call Trace:
[20644.989369] [<c014d202>] warn_slowpath_common+0x72/0xa0
[20644.989376] [<f814f5ec>] ? serial_unthrottle+0x7c/0x80 [usbserial]
[20644.989381] [<f814f5ec>] ? serial_unthrottle+0x7c/0x80 [usbserial]
[20644.989387] [<c014d24a>] warn_slowpath_null+0x1a/0x20
[20644.989392] [<f814f5ec>] serial_unthrottle+0x7c/0x80 [usbserial]
[20644.989402] [<c05911df>] ? _spin_lock_irqsave+0x2f/0x50
[20644.989407] [<c0590049>] ? mutex_lock+0x19/0x40
[20644.989416] [<c03bc2db>] tty_unthrottle+0x3b/0x50
[20644.989420] [<c03ba39e>] reset_buffer_flags+0xbe/0xf0
[20644.989424] [<c03ba3eb>] n_tty_flush_buffer+0x1b/0x80
[20644.989428] [<c03bd8cc>] tty_ldisc_flush+0x2c/0x50
[20644.989434] [<c03be900>] tty_port_close_end+0x20/0xe0
[20644.989441] [<f814fbda>] serial_close+0x6a/0xb0 [usbserial]
[20644.989444] [<c03b5a73>] ? tty_fasync+0x43/0x140
[20644.989448] [<c03b7d20>] tty_release_dev+0x120/0x4e0
[20644.989452] [<c0591218>] ? _spin_lock_irq+0x18/0x20
[20644.989456] [<c058f718>] ? wait_for_common+0xe8/0x130
[20644.989461] [<c0101c1d>] ? __switch_to+0xcd/0x180
[20644.989465] [<c0145e40>] ? default_wake_function+0x0/0x20
[20644.989469] [<c0590049>] ? mutex_lock+0x19/0x40
[20644.989473] [<c03b80f7>] tty_release+0x17/0x30
[20644.989479] [<c020baff>] __fput+0xdf/0x1f0
[20644.989482] [<c020bc2d>] fput+0x1d/0x30
[20644.989492] [<c020816c>] filp_close+0x4c/0x80
[20644.989497] [<c014f00b>] put_files_struct+0x6b/0xb0
[20644.989500] [<c014f098>] exit_files+0x48/0x60
[20644.989505] [<c015139f>] do_exit+0x12f/0x310
[20644.989509] [<c01515be>] do_group_exit+0x3e/0xa0
[20644.989517] [<c01602f2>] get_signal_to_deliver+0x1a2/0x3c0
[20644.989521] [<c01030a3>] do_signal+0x73/0x170
[20644.989525] [<c015f1cf>] ? do_send_specific+0x5f/0x90
[20644.989528] [<c03b8628>] ? tty_write+0x1b8/0x210
[20644.989532] [<c03b9f90>] ? n_tty_write+0x0/0x270
[20644.989536] [<c015d31e>] ? sigprocmask+0x7e/0x100
[20644.989540] [<c015d771>] ? sys_rt_sigprocmask+0xd1/0xf0
[20644.989544] [<c015d771>] ? sys_rt_sigprocmask+0xd1/0xf0
[20644.989547] [<c01031f5>] do_notify_resume+0x55/0x80
[20644.989551] [<c01034c8>] work_notifysig+0x13/0x1b
[20644.989555] ---[ end trace 90883237ae7ca2fe ]---
[20851.489301] ------------[ cut here ]------------
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https://bugs.launchpad.net/bugs/533982
Title:
WARNING: at /build/buildd/linux-2.6.32/drivers/usb/serial/usb-
serial.c:440 serial_unthrottle 0x7b/0x80 [usbserial]()
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