I tried it with an 2.6.26-2-686. Here the crash is not as hard as with the 2.6.29...
So, here is a backtrace (attachment) Thomas
Apr 22 07:41:18 bigend kernel: [ 1754.235431] ------------[ cut here ]------------ Apr 22 07:41:18 bigend kernel: [ 1754.235431] WARNING: at drivers/usb/serial/usb-serial.c:307 serial_write+0x58/0x6f [usbserial]() Apr 22 07:41:18 bigend kernel: [ 1754.235431] Modules linked in: tun sg sr_mod cdrom option usbserial usb_storage i915 drm ppdev parport_pc lp parport rfcomm l2cap bluetooth ipv6 acpi_cpufreq cpufreq_userspace cpufreq_ondemand cpufreq_powersave cpufreq_conservative cpufreq_stats freq_table binfmt_misc pciehp pci_hotplug fuse loop snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device iTCO_wdt serio_raw snd psmouse rng_core intel_agp soundcore snd_page_alloc agpgart video output eeepc_laptop battery ac button evdev ext3 jbd mbcache sha256_generic aes_i586 aes_generic cbc dm_crypt crypto_blkcipher dm_mirror dm_log dm_snapshot dm_mod sd_mod ata_generic ide_pci_generic ide_core uhci_hcd ata_piix libata scsi_mod dock ehci_hcd usbcore atl1e thermal processor fan thermal_sys Apr 22 07:41:18 bigend kernel: [ 1754.235431] Pid: 0, comm: swapper Tainted: G W 2.6.26-2-686 #1 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c01225bb>] warn_on_slowpath+0x40/0x66 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f8858a23>] qh_append_tds+0x34f/0x412 [ehci_hcd] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f8859176>] ehci_urb_enqueue+0xf8/0xd05 [ehci_hcd] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f88591da>] ehci_urb_enqueue+0x15c/0xd05 [ehci_hcd] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f903b3c4>] option_write+0xac/0xf8 [option] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f8fe22bc>] serial_write+0x58/0x6f [usbserial] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c022165b>] tty_put_char+0x22/0x25 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c0136007>] sysctl_check_table+0x462/0x463 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c0226065>] n_tty_receive_buf+0x82b/0xc7d Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c01188fe>] enqueue_task+0x52/0x5d Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c0118924>] activate_task+0x1b/0x26 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c011b6c5>] try_to_wake_up+0xe8/0xf1 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c0131949>] autoremove_wake_function+0xd/0x2d Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c01184a9>] __wake_up_common+0x2e/0x58 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c0222341>] tty_buffer_request_room+0x106/0x111 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c02220ad>] flush_to_ldisc+0xd6/0x160 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f903b248>] option_indat_callback+0x36/0x64 [option] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f8a59df0>] usb_hcd_giveback_urb+0x64/0x8f [usbcore] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f885669b>] ehci_urb_done+0x6b/0x77 [ehci_hcd] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f88573d9>] qh_completions+0x7b/0x304 [ehci_hcd] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f88576f7>] ehci_work+0x95/0x681 [ehci_hcd] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c013959d>] tick_program_event+0x1f/0x23 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c01360ac>] getnstimeofday+0x37/0xbc Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c010fcbd>] lapic_next_event+0xc/0x10 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c01387e8>] clockevents_program_event+0xc4/0xd2 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f885a6a5>] ehci_irq+0x108/0x128 [ehci_hcd] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c01394ea>] tick_dev_program_event+0x1e/0x82 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f8a5a0b6>] usb_hcd_irq+0x37/0x73 [usbcore] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c015208e>] handle_IRQ_event+0x23/0x51 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c015318d>] handle_fasteoi_irq+0x71/0xa4 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c0105f3a>] do_IRQ+0x4d/0x63 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c01042a7>] common_interrupt+0x23/0x28 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c01300d8>] param_attr_store+0x1b/0x1d Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<f883c087>] acpi_idle_enter_bm+0x2a9/0x317 [processor] Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c02499f1>] cpuidle_idle_call+0x5b/0x86 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c0249996>] cpuidle_idle_call+0x0/0x86 Apr 22 07:41:18 bigend kernel: [ 1754.235431] [<c01025ce>] cpu_idle+0xab/0xcb Apr 22 07:41:18 bigend kernel: [ 1754.235431] ======================= Apr 22 07:41:18 bigend kernel: [ 1754.235431] ---[ end trace 46bd34d2385a2284 ]--- Apr 22 07:41:18 bigend kernel: [ 1754.235431] ------------[ cut here ]------------
