BUG: scheduling while atomic reintroduced

[Sergey Senozhatsky]

Hello,
who is tty maintainer at the moment?

kernel: [30720.827764] BUG: soft lockup - CPU#1 stuck for 61s! [pppd:3132]
kernel: [30720.827766] 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 snd_timer snd_seq_device psmouse snd i2c_i801 serio_raw rng_core pcspkr soundcore snd_page_alloc asus_laptop evdev usbhid hid
sg sd_mod sr_mod cdrom ata_generic pata_acpi ata_piix sdhci_pci ricoh_mmc ide_pci_generic uhci_hcd sdhci mmc_core led_class ehci_hcd usbcore r8169 mii
kernel: [30720.827766] irq event stamp: 17186
kernel: [30720.827766] hardirqs last  enabled at (17185): [<c142da15>] _spin_unlock_irqrestore+0x75/0x90
kernel: [30720.827766] hardirqs last disabled at (17186): [<c142d26b>] _spin_lock_irq+0x1b/0x90
kernel: [30720.827766] softirqs last  enabled at (17058): [<f809101b>] ppp_channel_push+0xab/0xd0 [ppp_generic]
kernel: [30720.827766] softirqs last disabled at (17052): [<c142d5ea>] _read_lock_bh+0x1a/0x90
kernel: [30720.827766] 
kernel: [30720.827766] Pid: 3132, comm: pppd Not tainted (2.6.31-rc4-dbg-git2 #1) F3JC                
kernel: [30720.827766] EIP: 0060:[<c1036990>] EFLAGS: 00000202 CPU: 1
kernel: [30720.827766] EIP is at sub_preempt_count+0x80/0xb0
kernel: [30720.827766] EAX: 00000001 EBX: cdd677f4 ECX: 00000101 EDX: c27d8000
kernel: [30720.827766] ESI: cdd677ac EDI: 00000001 EBP: c27d9e98 ESP: c27d9e94
kernel: [30720.827766]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
kernel: [30720.827766] CR0: 8005003b CR2: b73a5000 CR3: 0275a000 CR4: 000006d0
kernel: [30720.827766] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
kernel: [30720.827766] DR6: ffff0ff0 DR7: 00000400
kernel: [30720.827766] Call Trace:
kernel: [30720.827766]  [<c1266b7f>] delay_tsc+0x7f/0xc0
kernel: [30720.827766]  [<c1266a88>] __delay+0x18/0x30
kernel: [30720.827766]  [<c126c820>] _raw_spin_lock+0xf0/0x170
kernel: [30720.827766]  [<c142d22c>] _spin_lock_bh+0x6c/0x90
kernel: [30720.827766]  [<f8090f94>] ? ppp_channel_push+0x24/0xd0 [ppp_generic]
kernel: [30720.827766]  [<f8090f94>] ppp_channel_push+0x24/0xd0 [ppp_generic]
kernel: [30720.827766]  [<f8091157>] ppp_write+0xd7/0xe0 [ppp_generic]
kernel: [30720.827766]  [<c1109fba>] vfs_write+0xba/0x1b0
kernel: [30720.827766]  [<f8091080>] ? ppp_write+0x0/0xe0 [ppp_generic]
kernel: [30720.827766]  [<c110ac53>] sys_write+0x53/0xa0
kernel: [30720.827766]  [<c100358b>] sysenter_do_call+0x12/0x32
kernel: [30786.327758] BUG: soft lockup - CPU#1 stuck for 61s! [pppd:3132]
kernel: [30786.327760] 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 snd_timer snd_seq_device psmouse snd i2c_i801 serio_raw rng_core pcspkr soundcore snd_page_alloc asus_laptop evdev usbhid hid
sg sd_mod sr_mod cdrom ata_generic pata_acpi ata_piix sdhci_pci ricoh_mmc ide_pci_generic uhci_hcd sdhci mmc_core led_class ehci_hcd usbcore r8169 mii
kernel: [30786.327760] irq event stamp: 17186
kernel: [30786.327760] hardirqs last  enabled at (17185): [<c142da15>] _spin_unlock_irqrestore+0x75/0x90
kernel: [30786.327760] hardirqs last disabled at (17186): [<c142d26b>] _spin_lock_irq+0x1b/0x90
kernel: [30786.327760] softirqs last  enabled at (17058): [<f809101b>] ppp_channel_push+0xab/0xd0 [ppp_generic]
kernel: [30786.327760] softirqs last disabled at (17052): [<c142d5ea>] _read_lock_bh+0x1a/0x90
kernel: [30786.327760] 
kernel: [30786.327760] Pid: 3132, comm: pppd Not tainted (2.6.31-rc4-dbg-git2 #1) F3JC                
kernel: [30786.327760] EIP: 0060:[<c1266b2b>] EFLAGS: 00000282 CPU: 1
kernel: [30786.327760] EIP is at delay_tsc+0x2b/0xc0
kernel: [30786.327760] EAX: 00000001 EBX: c24d46f0 ECX: 00000001 EDX: 00000000
kernel: [30786.327760] ESI: 324bdcc1 EDI: 00000001 EBP: c27d9eb4 ESP: c27d9ea0
kernel: [30786.327760]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
kernel: [30786.327760] CR0: 8005003b CR2: b73a5000 CR3: 0275a000 CR4: 000006d0
kernel: [30786.327760] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
kernel: [30786.327760] DR6: ffff0ff0 DR7: 00000400
kernel: [30786.327760] Call Trace:
kernel: [30786.327760]  [<c1266a88>] __delay+0x18/0x30
kernel: [30786.327760]  [<c126c820>] _raw_spin_lock+0xf0/0x170
kernel: [30786.327760]  [<c142d22c>] _spin_lock_bh+0x6c/0x90
kernel: [30786.327760]  [<f8090f94>] ? ppp_channel_push+0x24/0xd0 [ppp_generic]
kernel: [30786.327760]  [<f8090f94>] ppp_channel_push+0x24/0xd0 [ppp_generic]
kernel: [30786.327760]  [<f8091157>] ppp_write+0xd7/0xe0 [ppp_generic]
kernel: [30786.327760]  [<c1109fba>] vfs_write+0xba/0x1b0
kernel: [30786.327760]  [<f8091080>] ? ppp_write+0x0/0xe0 [ppp_generic]
kernel: [30786.327760]  [<c110ac53>] sys_write+0x53/0xa0
kernel: [30786.327760]  [<c100358b>] sysenter_do_call+0x12/0x32

	Sergey

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