BUG: scheduling while atomic reintroduced

[Sergey Senozhatsky]

something is wrong with tty->termios_mutex

kernel: [16662.855163] BUG: scheduling while atomic: ksoftirqd/0/4/0x00000203
kernel: [16662.855172] Modules linked in: usb_storage ppp_async crc_ccitt ppp_generic slhc ipv6 fuse loop snd_hda_codec_si3054 snd_hda_codec_realtek
snd_hda_intel snd_hda_codec snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq asus_laptop rng_core snd_timer snd_seq_device snd i2c_i801 soundcore snd_page_alloc psmouse
evdev pcspkr serio_raw usbhid hid sg sd_mod sr_mod cdrom sdhci_pci sdhci ata_generic mmc_core pata_acpi uhci_hcd ricoh_mmc led_class ehci_hcd ata_piix ide_pci_generic usbcore
r8169 mii
kernel: [16662.855292] Pid: 4, comm: ksoftirqd/0 Not tainted 2.6.31-rc4-git2 #1
kernel: [16662.855298] Call Trace:
kernel: [16662.855313]  [<c140265f>] ? printk+0x23/0x36
kernel: [16662.855325]  [<c103a865>] __schedule_bug+0x75/0x80
kernel: [16662.855336]  [<c14031f8>] schedule+0x5c8/0xb70
kernel: [16662.855347]  [<c1068d4b>] ? sched_clock_cpu+0x16b/0x1f0
kernel: [16662.855357]  [<c14058eb>] ? _spin_lock+0x1b/0x50
kernel: [16662.855367]  [<c10327a2>] ? task_rq_lock+0x42/0x90
kernel: [16662.855380]  [<c112e5b1>] ? ep_poll_callback+0xa1/0xe0
kernel: [16662.855391]  [<c1404234>] __mutex_lock_slowpath+0xe4/0x190
kernel: [16662.855401]  [<c1404035>] mutex_lock+0x25/0x50
kernel: [16662.855411]  [<c12d3443>] tty_throttle+0x23/0x70
kernel: [16662.855422]  [<c12d1d17>] n_tty_receive_buf+0x407/0x1200
kernel: [16662.855432]  [<c13b9348>] ? tcp_v4_do_rcv+0x258/0x390
kernel: [16662.855443]  [<c13a22bc>] ? __inet_lookup_established+0x2bc/0x2f0
kernel: [16662.855454]  [<c140608e>] ? _spin_unlock+0x1e/0x60
kernel: [16662.855463]  [<c13b99ef>] ? tcp_v4_rcv+0x56f/0x7a0
kernel: [16662.855475]  [<c109ccf0>] ? move_native_irq+0x20/0x70
kernel: [16662.855485]  [<c1405f70>] ? _spin_unlock_irqrestore+0x20/0x60
kernel: [16662.855494]  [<c12d4352>] ? tty_ldisc_try+0x42/0x60
kernel: [16662.855504]  [<c12d55e5>] flush_to_ldisc+0xf5/0x1f0
kernel: [16662.855514]  [<c12d575b>] tty_flip_buffer_push+0x7b/0x90
kernel: [16662.855524]  [<c12d68b5>] pty_write+0x55/0x80
kernel: [16662.855537]  [<f8095c57>] ppp_async_push+0x397/0x480 [ppp_async]
kernel: [16662.855551]  [<f80964f5>] ppp_async_process+0x85/0x98 [ppp_async]
kernel: [16662.855561]  [<c104cad3>] tasklet_action+0xe3/0xf0
kernel: [16662.855570]  [<c104d417>] __do_softirq+0xa7/0x210
kernel: [16662.855580]  [<c104d5cd>] do_softirq+0x4d/0x60
kernel: [16662.855589]  [<c104d662>] ksoftirqd+0x82/0x1a0
kernel: [16662.855598]  [<c104d5e0>] ? ksoftirqd+0x0/0x1a0
kernel: [16662.855608]  [<c10618b4>] kthread+0x84/0x90
kernel: [16662.855618]  [<c1061830>] ? kthread+0x0/0x90
kernel: [16662.855629]  [<c1003e7f>] kernel_thread_helper+0x7/0x18


commit 26a2e20f4a966bebc312836aeb4423fbfd4e33e2
commit 38db89799bdf11625a831c5af33938dcb11908b6


	Sergey

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