warning at serial_write_room and serial_write

From: David Newall
Date: Tue Apr 20 2010 - 08:46:18 EST

Hello all,

What do the warnings, below, mean?

Thanks,

David



Apr 20 20:03:04 ubuntu xinetd[2509]: added service telnet [file=/etc/inetd.conf] [line=1]
Apr 20 20:03:04 ubuntu xinetd[2509]: xinetd Version 2.3.14 started with libwrap loadavg options compiled i
n.
Apr 20 20:03:04 ubuntu xinetd[2509]: Started working: 2 available services
Apr 20 20:03:04 ubuntu kernel: [ 87.409895] ------------[ cut here ]------------
Apr 20 20:03:04 ubuntu kernel: [ 87.409931] WARNING: at /build/buildd/linux-2.6.28/drivers/usb/serial/usb-serial.c:326 serial_write_room+0x70/0x80 [usbserial]()
Apr 20 20:03:04 ubuntu kernel: [ 87.409972] Modules linked in: ppdev parport_pc lp parport pl2303 usbserial serio_raw snd_usb_audio snd_usb_lib cm109 snd_rawmidi snd_seq_device snd_pcm snd_hwdep snd_timer snd soundcore snd_page_alloc pcspkr r6040 mii usbhid aufs exportfs fbcon tileblit font bitblit softcursor
Apr 20 20:03:04 ubuntu kernel: [ 87.410199] Pid: 6, comm: events/0 Not tainted 2.6.28-15-generic #49-Ubuntu
Apr 20 20:03:04 ubuntu kernel: [ 87.410227] Call Trace:
Apr 20 20:03:04 ubuntu kernel: [ 87.410274] [<c04fdfc6>] ? printk+0x18/0x1a
Apr 20 20:03:04 ubuntu kernel: [ 87.410315] [<c0139c14>] warn_on_slowpath+0x54/0x80
Apr 20 20:03:04 ubuntu kernel: [ 87.410370] [<c012fae0>] ? finish_task_switch+0xb0/0xe0
Apr 20 20:03:04 ubuntu kernel: [ 87.410405] [<c0500273>] ? _spin_unlock_irqrestore+0x23/0x40
Apr 20 20:03:04 ubuntu kernel: [ 87.410444] [<c01ae86f>] ? dma_pool_alloc+0x10f/0x120
Apr 20 20:03:04 ubuntu kernel: [ 87.410477] [<c01ae86f>] ? dma_pool_alloc+0x10f/0x120
Apr 20 20:03:04 ubuntu kernel: [ 87.410530] [<d0f23660>] serial_write_room+0x70/0x80 [usbserial]
Apr 20 20:03:04 ubuntu kernel: [ 87.410573] [<c03c8d9a>] ? handshake_on_error_set_halt+0x2a/0x90
Apr 20 20:03:04 ubuntu kernel: [ 87.410609] [<c03320b8>] tty_write_room+0x18/0x20
Apr 20 20:03:04 ubuntu kernel: [ 87.410653] [<c032fa5a>] opost+0x1a/0x260
Apr 20 20:03:04 ubuntu kernel: [ 87.410683] [<c032fccd>] echo_char+0x2d/0x70
Apr 20 20:03:04 ubuntu kernel: [ 87.410713] [<c0331567>] n_tty_receive_char+0x157/0x6f0
Apr 20 20:03:04 ubuntu kernel: [ 87.410748] [<c03ca2b9>] ? qh_schedule+0x169/0x2e0
Apr 20 20:03:04 ubuntu kernel: [ 87.410780] [<c0331d50>] n_tty_receive_buf+0x250/0x4b0
Apr 20 20:03:04 ubuntu kernel: [ 87.410814] [<c0127cad>] ? update_curr+0x8d/0x1e0
Apr 20 20:03:04 ubuntu kernel: [ 87.410850] [<c012adb6>] ? dequeue_entity+0x16/0x2a0
Apr 20 20:03:04 ubuntu kernel: [ 87.410883] [<c0500273>] ? _spin_unlock_irqrestore+0x23/0x40
Apr 20 20:03:04 ubuntu kernel: [ 87.410918] [<c0500273>] ? _spin_unlock_irqrestore+0x23/0x40
Apr 20 20:03:04 ubuntu init: set_tcp_rto_max main process (2556) terminated with status 2
Apr 20 20:03:04 ubuntu kernel: [ 87.410953] [<c03343ae>] flush_to_ldisc+0xee/0x1b0
Apr 20 20:03:04 ubuntu kernel: [ 87.410983] [<c03342c0>] ? flush_to_ldisc+0x0/0x1b0
Apr 20 20:03:04 ubuntu kernel: [ 87.411014] [<c014b0dd>] run_workqueue+0x8d/0x150
Apr 20 20:03:04 ubuntu kernel: [ 87.411051] [<c014f03a>] ? prepare_to_wait+0x3a/0x70
Apr 20 20:03:04 ubuntu kernel: [ 87.411080] [<c014b358>] worker_thread+0x88/0xf0
Apr 20 20:03:04 ubuntu kernel: [ 87.411110] [<c014ede0>] ? autoremove_wake_function+0x0/0x50
Apr 20 20:03:04 ubuntu kernel: [ 87.411140] [<c014b2d0>] ? worker_thread+0x0/0xf0
Apr 20 20:03:04 ubuntu kernel: [ 87.411169] [<c014ea3c>] kthread+0x3c/0x70
Apr 20 20:03:04 ubuntu kernel: [ 87.411197] [<c014ea00>] ? kthread+0x0/0x70
Apr 20 20:03:05 ubuntu kernel: [ 87.411231] [<c0105477>] kernel_thread_helper+0x7/0x10
Apr 20 20:03:05 ubuntu kernel: [ 87.411256] ---[ end trace 62523b8bb1bd4d2e ]---
Apr 20 20:03:05 ubuntu kernel: [ 87.411307] ------------[ cut here ]------------
Apr 20 20:03:05 ubuntu kernel: [ 87.411330] WARNING: at /build/buildd/linux-2.6.28/drivers/usb/serial/usb-serial.c:313 serial_write+0x9f/0xb0 [usbserial]()
Apr 20 20:03:05 ubuntu kernel: [ 87.411362] Modules linked in: ppdev parport_pc lp parport pl2303 usbserial serio_raw snd_usb_audio snd_usb_lib cm109 snd_rawmidi snd_seq_device snd_pcm snd_hwdep snd_timer snd soundcore snd_page_alloc pcspkr r6040 mii usbhid aufs exportfs fbcon tileblit font bitblit softcursor
Apr 20 20:03:05 ubuntu kernel: [ 87.411565] Pid: 6, comm: events/0 Tainted: G W 2.6.28-15-generic #49-Ubuntu
Apr 20 20:03:05 ubuntu kernel: [ 87.411590] Call Trace:
Apr 20 20:03:05 ubuntu kernel: [ 87.411620] [<c04fdfc6>] ? printk+0x18/0x1a
Apr 20 20:03:05 ubuntu kernel: [ 87.411651] [<c0139c14>] warn_on_slowpath+0x54/0x80
Apr 20 20:03:05 ubuntu kernel: [ 87.411694] [<c012fae0>] ? finish_task_switch+0xb0/0xe0
Apr 20 20:03:05 ubuntu kernel: [ 87.411725] [<c0500273>] ? _spin_unlock_irqrestore+0x23/0x40
Apr 20 20:03:05 ubuntu kernel: [ 87.411756] [<c0500273>] ? _spin_unlock_irqrestore+0x23/0x40
Apr 20 20:03:05 ubuntu kernel: [ 87.411808] [<d0f2370f>] serial_write+0x9f/0xb0 [usbserial]
Apr 20 20:03:05 ubuntu kernel: [ 87.411849] [<c032c2fb>] tty_put_char+0x2b/0x40
Apr 20 20:03:05 ubuntu kernel: [ 87.411880] [<c032faf1>] opost+0xb1/0x260
Apr 20 20:03:05 ubuntu kernel: [ 87.411907] [<c032fccd>] echo_char+0x2d/0x70
Apr 20 20:03:05 ubuntu kernel: [ 87.411935] [<c0331567>] n_tty_receive_char+0x157/0x6f0
Apr 20 20:03:05 ubuntu kernel: [ 87.411968] [<c03ca2b9>] ? qh_schedule+0x169/0x2e0
Apr 20 20:03:05 ubuntu kernel: [ 87.411997] [<c0331d50>] n_tty_receive_buf+0x250/0x4b0
Apr 20 20:03:05 ubuntu kernel: [ 87.412029] [<c0127cad>] ? update_curr+0x8d/0x1e0
Apr 20 20:03:05 ubuntu kernel: [ 87.412061] [<c012adb6>] ? dequeue_entity+0x16/0x2a0
Apr 20 20:03:05 ubuntu kernel: [ 87.412091] [<c0500273>] ? _spin_unlock_irqrestore+0x23/0x40
Apr 20 20:03:05 ubuntu kernel: [ 87.412122] [<c0500273>] ? _spin_unlock_irqrestore+0x23/0x40
Apr 20 20:03:05 ubuntu kernel: [ 87.412154] [<c03343ae>] flush_to_ldisc+0xee/0x1b0
Apr 20 20:03:05 ubuntu kernel: [ 87.412184] [<c03342c0>] ? flush_to_ldisc+0x0/0x1b0
Apr 20 20:03:05 ubuntu kernel: [ 87.412213] [<c014b0dd>] run_workqueue+0x8d/0x150
Apr 20 20:03:05 ubuntu kernel: [ 87.412246] [<c014f03a>] ? prepare_to_wait+0x3a/0x70
Apr 20 20:03:05 ubuntu kernel: [ 87.412275] [<c014b358>] worker_thread+0x88/0xf0
Apr 20 20:03:05 ubuntu kernel: [ 87.412306] [<c014ede0>] ? autoremove_wake_function+0x0/0x50
Apr 20 20:03:05 ubuntu kernel: [ 87.412336] [<c014b2d0>] ? worker_thread+0x0/0xf0
Apr 20 20:03:05 ubuntu kernel: [ 87.412366] [<c014ea3c>] kthread+0x3c/0x70
Apr 20 20:03:05 ubuntu kernel: [ 87.412393] [<c014ea00>] ? kthread+0x0/0x70
Apr 20 20:03:05 ubuntu kernel: [ 87.412426] [<c0105477>] kernel_thread_helper+0x7/0x10
Apr 20 20:03:05 ubuntu kernel: [ 87.412449] ---[ end trace 62523b8bb1bd4d2e ]---

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