Re: [Bug #13522] BUG: scheduling while atomic

Sergey Senozhatsky
2009-06-29T16:28:53Z

On (06/29/09 15:41), Alan Cox wrote:
> > This message has been generated automatically as a part of a report
> > of recent regressions.
> >
> > The following bug entry is on the current list of known regressions
> > from 2.6.30. Please verify if it still should be listed and let me know
> > (either way).
>
> Yes although getting people seeing to test with might_sleep() checks in
> the tty layer demonstrate the tty layer isn't calling into ppp with irqs
> disabled when it shouldn't so I'm at a loss as to whether this is a
> network bug, a scheduler bug or something else.
>
> The schedule error in __tasklet_schedule() is itself rather peicular.
>

Hello Alan, Rafael,

BUG is still here...

kernel: [ 7331.719518] BUG: scheduling while atomic: pptpgw/4161/0x10000500
kernel: [ 7331.719526] Modules linked in: ppp_deflate zlib_deflate 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 snd pcspkr soundcore psmouse serio_raw snd_page_alloc i2c_i801 rng_core evdev
asus_laptop usbhid hid sg sd_mod sr_mod cdrom ata_generic pata_acpi uhci_hcd ata_piix sdhci_pci sdhci ricoh_mmc mmc_core led_class ide_pci_generic ehci_hcd r8169 mii usbcore
kernel: [ 7331.719627]
kernel: [ 7331.719636] Pid: 4161, comm: pptpgw Not tainted (2.6.31-rc1-dbgnv-git4 #32) F3JC
kernel: [ 7331.719644] EIP: 0060:[<c13ffcd6>] EFLAGS: 00200246 CPU: 0
kernel: [ 7331.719657] EIP is at _spin_unlock_irqrestore+0x16/0x30
kernel: [ 7331.719664] EAX: c1690300 EBX: 00200246 ECX: 00000000 EDX: 00200246
kernel: [ 7331.719671] ESI: dcf68398 EDI: 0000003a EBP: dcf61e94 ESP: dcf61e90
kernel: [ 7331.719677] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
kernel: [ 7331.719684] CR0: 8005003b CR2: b6f77000 CR3: 1b4c3000 CR4: 000006d0
kernel: [ 7331.719690] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
kernel: [ 7331.719696] DR6: ffff0ff0 DR7: 00000400
kernel: [ 7331.719701] Call Trace:
kernel: [ 7331.719714] [<c12d002b>] tty_ldisc_deref+0x5b/0x90
kernel: [ 7331.719724] [<c12d16f5>] pty_write+0x85/0x90
kernel: [ 7331.719734] [<c12cbde3>] n_tty_write+0x303/0x410
kernel: [ 7331.719745] [<c103d8f0>] ? default_wake_function+0x0/0x40
kernel: [ 7331.719754] [<c12c8fc3>] tty_write+0x173/0x250
kernel: [ 7331.719763] [<c10ebcaf>] ? rw_verify_area+0x6f/0xf0
kernel: [ 7331.719772] [<c12cbae0>] ? n_tty_write+0x0/0x410
kernel: [ 7331.719781] [<c10ec89e>] vfs_write+0xbe/0x1c0
kernel: [ 7331.719790] [<c12c8e50>] ? tty_write+0x0/0x250
kernel: [ 7331.719798] [<c10ecaa8>] sys_write+0x58/0xa0
kernel: [ 7331.719808] [<c100324b>] sysenter_do_call+0x12/0x22

Sergey