BUG: scheduling while atomic reintroduced

From: Sergey Senozhatsky
Date: Tue Jul 28 2009 - 14:03:52 EST

Hello Alan,
Looks like someone reintroduced "scheduling while atomic" bug.
(rc4-git2)

...
kernel: [ 747.713441] BUG: scheduling while atomic: ksoftirqd/0/4/0x00000203
kernel: [ 747.713450] Modules linked in: 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: [ 747.713567] Pid: 4, comm: ksoftirqd/0 Not tainted 2.6.31-rc4-git2 #1
kernel: [ 747.713573] Call Trace:
kernel: [ 747.713589] [<c140265f>] ? printk+0x23/0x36
kernel: [ 747.713601] [<c103a865>] __schedule_bug+0x75/0x80
kernel: [ 747.713610] [<c14031f8>] schedule+0x5c8/0xb70
kernel: [ 747.713622] [<c1068d4b>] ? sched_clock_cpu+0x16b/0x1f0
kernel: [ 747.713631] [<c14058eb>] ? _spin_lock+0x1b/0x50
kernel: [ 747.713642] [<c10327a2>] ? task_rq_lock+0x42/0x90
kernel: [ 747.713654] [<c112e5b1>] ? ep_poll_callback+0xa1/0xe0
kernel: [ 747.713665] [<c1404234>] __mutex_lock_slowpath+0xe4/0x190
kernel: [ 747.713674] [<c1404035>] mutex_lock+0x25/0x50
kernel: [ 747.713684] [<c12d3443>] tty_throttle+0x23/0x70
kernel: [ 747.713695] [<c12d1d17>] n_tty_receive_buf+0x407/0x1200
kernel: [ 747.713708] [<c13a22bc>] ? __inet_lookup_established+0x2bc/0x2f0
kernel: [ 747.713719] [<c140608e>] ? _spin_unlock+0x1e/0x60
kernel: [ 747.713728] [<c13b99ef>] ? tcp_v4_rcv+0x56f/0x7a0
kernel: [ 747.713739] [<c1405f70>] ? _spin_unlock_irqrestore+0x20/0x60
kernel: [ 747.713748] [<c12d4352>] ? tty_ldisc_try+0x42/0x60
kernel: [ 747.713757] [<c12d55e5>] flush_to_ldisc+0xf5/0x1f0
kernel: [ 747.713767] [<c12d575b>] tty_flip_buffer_push+0x7b/0x90
kernel: [ 747.713777] [<c12d68b5>] pty_write+0x55/0x80
kernel: [ 747.713790] [<f8095c57>] ppp_async_push+0x397/0x480 [ppp_async]
kernel: [ 747.713804] [<f80964f5>] ppp_async_process+0x85/0x98 [ppp_async]
kernel: [ 747.713814] [<c104cad3>] tasklet_action+0xe3/0xf0
kernel: [ 747.713824] [<c104d417>] __do_softirq+0xa7/0x210
kernel: [ 747.713834] [<c104d5cd>] do_softirq+0x4d/0x60
kernel: [ 747.713843] [<c104d662>] ksoftirqd+0x82/0x1a0
kernel: [ 747.713851] [<c104d5e0>] ? ksoftirqd+0x0/0x1a0
kernel: [ 747.713862] [<c10618b4>] kthread+0x84/0x90
kernel: [ 747.713872] [<c1061830>] ? kthread+0x0/0x90
kernel: [ 747.713883] [<c1003e7f>] kernel_thread_helper+0x7/0x18
kernel: [ 973.783398] BUG: scheduling while atomic: ksoftirqd/0/4/0x00000203
kernel: [ 973.783407] Modules linked in: 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: [ 973.783525] Pid: 4, comm: ksoftirqd/0 Not tainted 2.6.31-rc4-git2 #1
kernel: [ 973.783531] Call Trace:
kernel: [ 973.783546] [<c140265f>] ? printk+0x23/0x36
kernel: [ 973.783558] [<c103a865>] __schedule_bug+0x75/0x80
kernel: [ 973.783567] [<c14031f8>] schedule+0x5c8/0xb70
kernel: [ 973.783579] [<c1068d4b>] ? sched_clock_cpu+0x16b/0x1f0
kernel: [ 973.783589] [<c14058eb>] ? _spin_lock+0x1b/0x50
kernel: [ 973.783599] [<c10327a2>] ? task_rq_lock+0x42/0x90
kernel: [ 973.783609] [<c103d610>] ? default_wake_function+0x0/0x40
kernel: [ 973.783620] [<c1404234>] __mutex_lock_slowpath+0xe4/0x190
kernel: [ 973.783630] [<c1404035>] mutex_lock+0x25/0x50
kernel: [ 973.783641] [<c12d3443>] tty_throttle+0x23/0x70
kernel: [ 973.783652] [<c12d1d17>] n_tty_receive_buf+0x407/0x1200
kernel: [ 973.783663] [<c13b9348>] ? tcp_v4_do_rcv+0x258/0x390
kernel: [ 973.783673] [<c13a22bc>] ? __inet_lookup_established+0x2bc/0x2f0
kernel: [ 973.783685] [<c140608e>] ? _spin_unlock+0x1e/0x60
kernel: [ 973.783693] [<c13b99ef>] ? tcp_v4_rcv+0x56f/0x7a0
kernel: [ 973.783704] [<c1405f70>] ? _spin_unlock_irqrestore+0x20/0x60
kernel: [ 973.783713] [<c12d4352>] ? tty_ldisc_try+0x42/0x60
kernel: [ 973.783723] [<c12d55e5>] flush_to_ldisc+0xf5/0x1f0
kernel: [ 973.783733] [<c12d575b>] tty_flip_buffer_push+0x7b/0x90
kernel: [ 973.783742] [<c12d68b5>] pty_write+0x55/0x80
kernel: [ 973.783755] [<f8095c57>] ppp_async_push+0x397/0x480 [ppp_async]
kernel: [ 973.783769] [<f80964f5>] ppp_async_process+0x85/0x98 [ppp_async]
kernel: [ 973.783780] [<c104cad3>] tasklet_action+0xe3/0xf0
kernel: [ 973.783789] [<c104d417>] __do_softirq+0xa7/0x210
kernel: [ 973.783799] [<c104d5cd>] do_softirq+0x4d/0x60
kernel: [ 973.783807] [<c104d662>] ksoftirqd+0x82/0x1a0
kernel: [ 973.783816] [<c104d5e0>] ? ksoftirqd+0x0/0x1a0
kernel: [ 973.783827] [<c10618b4>] kthread+0x84/0x90
kernel: [ 973.783837] [<c1061830>] ? kthread+0x0/0x90
kernel: [ 973.783848] [<c1003e7f>] kernel_thread_helper+0x7/0x18
kernel: [ 973.790112] BUG: scheduling while atomic: ksoftirqd/0/4/0x00000203
kernel: [ 973.790119] Modules linked in: 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: [ 973.790228] Pid: 4, comm: ksoftirqd/0 Not tainted 2.6.31-rc4-git2 #1
kernel: [ 973.790234] Call Trace:
kernel: [ 973.790244] [<c140265f>] ? printk+0x23/0x36
kernel: [ 973.790254] [<c103a865>] __schedule_bug+0x75/0x80
kernel: [ 973.790264] [<c14031f8>] schedule+0x5c8/0xb70
kernel: [ 973.790274] [<c1068d4b>] ? sched_clock_cpu+0x16b/0x1f0
kernel: [ 973.790283] [<c14058eb>] ? _spin_lock+0x1b/0x50
kernel: [ 973.790294] [<c10327a2>] ? task_rq_lock+0x42/0x90
kernel: [ 973.790306] [<c1404234>] __mutex_lock_slowpath+0xe4/0x190
kernel: [ 973.790315] [<c1404035>] mutex_lock+0x25/0x50
kernel: [ 973.790325] [<c12d3443>] tty_throttle+0x23/0x70
kernel: [ 973.790335] [<c12d1d17>] n_tty_receive_buf+0x407/0x1200
kernel: [ 973.790345] [<c104d86c>] ? local_bh_enable_ip+0x4c/0xc0
kernel: [ 973.790357] [<f80959c5>] ? ppp_async_push+0x105/0x480 [ppp_async]
kernel: [ 973.790369] [<c104d86c>] ? local_bh_enable_ip+0x4c/0xc0
kernel: [ 973.790379] [<c1405d56>] ? _spin_unlock_bh+0x26/0x40
kernel: [ 973.790393] [<f8033878>] ? ppp_push+0x158/0x5a0 [ppp_generic]
kernel: [ 973.790403] [<c1405f70>] ? _spin_unlock_irqrestore+0x20/0x60
kernel: [ 973.790412] [<c12d4352>] ? tty_ldisc_try+0x42/0x60
kernel: [ 973.790422] [<c12d55e5>] flush_to_ldisc+0xf5/0x1f0
kernel: [ 973.790432] [<c12d575b>] tty_flip_buffer_push+0x7b/0x90
kernel: [ 973.790442] [<c12d68b5>] pty_write+0x55/0x80
kernel: [ 973.790453] [<f8095c57>] ppp_async_push+0x397/0x480 [ppp_async]
kernel: [ 973.790467] [<f80964f5>] ppp_async_process+0x85/0x98 [ppp_async]
kernel: [ 973.790476] [<c104cad3>] tasklet_action+0xe3/0xf0
kernel: [ 973.790486] [<c104d417>] __do_softirq+0xa7/0x210
kernel: [ 973.790496] [<c104d5cd>] do_softirq+0x4d/0x60
kernel: [ 973.790505] [<c104d662>] ksoftirqd+0x82/0x1a0
kernel: [ 973.790514] [<c104d5e0>] ? ksoftirqd+0x0/0x1a0
kernel: [ 973.790524] [<c10618b4>] kthread+0x84/0x90
kernel: [ 973.790534] [<c1061830>] ? kthread+0x0/0x90
kernel: [ 973.790543] [<c1003e7f>] kernel_thread_helper+0x7/0x18
...

Please Cc me.

Sergey

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