Same happens here with at least two different USB devices:

usb 1-4.3: reset high speed USB device using ehci_hcd and address 5
usb 1-4.3: reset high speed USB device using ehci_hcd and address 6
usb 2-2: reset high speed USB device using ehci_hcd and address 6
usb 2-2: reset high speed USB device using ehci_hcd and address 7
usb 2-2: reset high speed USB device using ehci_hcd and address 9


While trying to use an USB device in VirtualBox (sometimes it works, sometimes it does not recognize the device in the VM) it got a little chattier: 

09:39:50 simpad kernel: [ 8956.296858] ------------[ cut here ]------------
Oct 14 09:39:50 simpad kernel: [ 8956.296868] WARNING: at /build/buildd/linux-2.6.35/drivers/usb/host/ehci-hcd.c:1071 ehci_endpoint_reset+0xe2/0xf0()
Oct 14 09:39:50 simpad kernel: [ 8956.296871] Hardware name: 64586QG
Oct 14 09:39:50 simpad kernel: [ 8956.296873] clear_halt for a busy endpoint
Oct 14 09:39:50 simpad kernel: [ 8956.296874] Modules linked in: isofs cdc_acm snd_usb_audio uvcvideo videodev snd_usbmidi_lib v4l1_compat nls_iso8859_1 nls_cp437 vfat nls_utf8 fat udf rfcomm binfmt_misc sco bnep l2cap vboxnetadp vboxnetflt vboxdrv deflate zlib_deflate ctr twofish twofish_common camellia serpent blowfish cast5 des_generic dm_crypt aes_i586 aes_generic xcbc rmd160 sha512_generic sha256_generic snd_hda_codec_analog nvidia(P) sha1_generic crypto_null af_key joydev usbhid hid snd_hda_intel snd_hda_codec snd_hwdep snd_pcm arc4 snd_seq_midi snd_rawmidi snd_seq_midi_event thinkpad_acpi iwlagn iwlcore pcmcia snd_seq snd_timer snd_seq_device mac80211 ppdev tpm_tis tpm parport_pc snd nvram tpm_bios cfg80211 r852 sm_common soundcore nand nand_ids nand_ecc yenta_socket pcmcia_rsrc psmouse snd_page_alloc mtd serio_raw pcmcia_core lp btusb parport bluetooth usb_storage firewire_ohci sdhci_pci sdhci ahci firewire_core led_class intel_agp crc_itu_t libahci e1000e video output agpgart
Oct 14 09:39:50 simpad kernel: [ 8956.296963] Pid: 5054, comm: VirtualBox Tainted: P            2.6.35-22-generic #34-Ubuntu
Oct 14 09:39:50 simpad kernel: [ 8956.296965] Call Trace:
Oct 14 09:39:50 simpad kernel: [ 8956.296972]  [<c014ac52>] warn_slowpath_common+0x72/0xa0
Oct 14 09:39:50 simpad kernel: [ 8956.296976]  [<c0485c42>] ? ehci_endpoint_reset+0xe2/0xf0
Oct 14 09:39:50 simpad kernel: [ 8956.296979]  [<c0485c42>] ? ehci_endpoint_reset+0xe2/0xf0
Oct 14 09:39:50 simpad kernel: [ 8956.296982]  [<c014ad23>] warn_slowpath_fmt+0x33/0x40
Oct 14 09:39:50 simpad kernel: [ 8956.296985]  [<c0485c42>] ehci_endpoint_reset+0xe2/0xf0
Oct 14 09:39:50 simpad kernel: [ 8956.296988]  [<c046f0e6>] usb_hcd_reset_endpoint+0x26/0x80
Oct 14 09:39:50 simpad kernel: [ 8956.296991]  [<c0472431>] usb_reset_endpoint+0x21/0x40
Oct 14 09:39:50 simpad kernel: [ 8956.296994]  [<c047341f>] usb_clear_halt+0x6f/0x80
Oct 14 09:39:50 simpad kernel: [ 8956.296997]  [<c047c682>] usbdev_do_ioctl+0x412/0xc60
Oct 14 09:39:50 simpad kernel: [ 8956.297001]  [<c01743fb>] ? clockevents_program_event+0x8b/0x140
Oct 14 09:39:50 simpad kernel: [ 8956.297005]  [<c017597e>] ? tick_program_event+0x2e/0x40
Oct 14 09:39:50 simpad kernel: [ 8956.297008]  [<c047cedd>] usbdev_ioctl+0xd/0x10
Oct 14 09:39:50 simpad kernel: [ 8956.297011]  [<c0226622>] vfs_ioctl+0x32/0xb0
Oct 14 09:39:50 simpad kernel: [ 8956.297014]  [<c047ced0>] ? usbdev_ioctl+0x0/0x10
Oct 14 09:39:50 simpad kernel: [ 8956.297016]  [<c0226eb9>] do_vfs_ioctl+0x79/0x2d0
Oct 14 09:39:50 simpad kernel: [ 8956.297019]  [<c0227177>] sys_ioctl+0x67/0x80
Oct 14 09:39:50 simpad kernel: [ 8956.297022]  [<c05cf79b>] ? smp_apic_timer_interrupt+0x5b/0x8a
Oct 14 09:39:50 simpad kernel: [ 8956.297026]  [<c05c9114>] syscall_call+0x7/0xb
Oct 14 09:39:50 simpad kernel: [ 8956.297030]  [<c05c0000>] ? cpu_init+0x207/0x249
Oct 14 09:39:50 simpad kernel: [ 8956.297032] ---[ end trace 757e5340b82a843e ]---