Re: [Xen-devel] 4.0-rc9-pre/xen-next: BUG: scheduling while atomic: xenwatch

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 03/29/2010 03:29 PM, Mark Hurenkamp wrote:
> Hi,
>
> I've got a machine running 4.0-rc9-pre with xen-next kernel. During boot-up i
> see the following message repeated several times, is this harmful? Can i do
> anything about it?
> If you like more info, just let me know.
>    
It's not good.  Could you include the complete kernel output, preferably 
not line wrapped.  Which version did you build the kernel from?
Thanks,
    J

> Regards,
> Mark.
>
>
> BUG: scheduling while atomic: xenwatch/23/0x00000003
> INFO: lockdep is turned off.
> Modules linked in: radeon ttm drm_kms_helper drm joydev hidp rfcomm sco bnep
> l2cap tun xt_physdev vboxnetadp vboxnetflt vboxdrv dummy bridge stp llc cx8800
> cx88xx bttv ir_common lirc_i2c lirc_dev autofs4 ipv6 nfsd exportfs nfs
> tda18271 tda10048 lockd fscache nfs_acl auth_rpcgss wm8775 tea5767
> tuner_simple tuner_types tda9887 tda8290 snd_hda_codec_atihdmi tuner
> snd_hda_codec_via cx25840 snd_hda_intel msp3400 snd_hda_codec cx23885 saa7127
> snd_pcm_oss sunrpc snd_mixer_oss videobuf_dma_sg snd_hwdep videobuf_dvb
> snd_seq_dummy snd_pcm saa7115 snd_seq_oss dvb_core snd_seq_midi ivtv
> snd_rawmidi i2c_algo_bit cx2341x snd_seq_midi_event v4l2_common snd_seq
> videobuf_core videodev snd_timer v4l1_compat btcx_risc snd_seq_device btusb
> v4l2_compat_ioctl32 8250_pnp snd tveeprom asix soundcore asus_atk0110
> bluetooth snd_page_alloc i2c_core usbnet 8250 hwmon shpchp serial_core raid10
> raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy
> async_tx multipath linear fuse raid0 raid1 ata_generic pata_acpi r8169 mii
> pata_jmicron
> Pid: 23, comm: xenwatch Tainted: G        W  2.6.32mh23 #3
> Call Trace:
>   [<ffffffff8104ee00>] __schedule_bug+0x77/0x7c
>   [<ffffffff8147a611>] schedule+0xd5/0x849
>   [<ffffffff8100ea71>] ? xen_force_evtchn_callback+0xd/0xf
>   [<ffffffff8100f362>] ? check_events+0x12/0x20
>   [<ffffffff8107c3a8>] ? prepare_to_wait+0x58/0x61
>   [<ffffffff8147d448>] ? _spin_unlock_irqrestore+0x70/0x7e
>   [<ffffffff812c33fa>] read_reply+0xa1/0x11e
>   [<ffffffff8107c13e>] ? autoremove_wake_function+0x0/0x39
>   [<ffffffff812c35ef>] xs_talkv+0xb2/0x174
>   [<ffffffff8124b375>] ? kasprintf+0x38/0x3b
>   [<ffffffff812c37f6>] xs_single+0x3a/0x3c
>   [<ffffffff812c3ea5>] xenbus_read+0x42/0x5b
>   [<ffffffff812c3ffd>] xenbus_scanf+0x22/0x75
>   [<ffffffff81249790>] ? snprintf+0x34/0x36
>   [<ffffffff812ca444>] pciback_publish_pci_root+0xe6/0x242
>   [<ffffffff8108fc10>] ? lock_acquired+0x255/0x264
>   [<ffffffff812ccc02>] ? pciback_publish_pci_roots+0x2c/0xc3
>   [<ffffffff812c0202>] ? xen_evtchn_do_upcall+0x11a/0x1ec
>   [<ffffffff812ca35e>] ? pciback_publish_pci_root+0x0/0x242
>   [<ffffffff812ccc68>] pciback_publish_pci_roots+0x92/0xc3
>   [<ffffffff812ca97c>] pciback_setup_backend+0x239/0x2e6
>   [<ffffffff812c3f91>] ? xenbus_gather+0xd3/0x11d
>   [<ffffffff812caa55>] pciback_be_watch+0x2c/0x30
>   [<ffffffff812cb2f8>] pciback_xenbus_probe+0x1ae/0x1fa
>   [<ffffffff812c49ee>] xenbus_dev_probe+0xb8/0x17c
>   [<ffffffff813099f8>] driver_probe_device+0xde/0x1fe
>   [<ffffffff81309bd3>] __device_attach+0x3a/0x3f
>   [<ffffffff81309b99>] ? __device_attach+0x0/0x3f
>   [<ffffffff81308b97>] bus_for_each_drv+0x59/0x90
>   [<ffffffff81309c6d>] device_attach+0x66/0x7d
>   [<ffffffff813089ab>] bus_probe_device+0x27/0x3e
>   [<ffffffff81307025>] device_add+0x3b4/0x55f
>   [<ffffffff8124d9fd>] ? __spin_lock_init+0x31/0x54
>   [<ffffffff813071ee>] device_register+0x1e/0x22
>   [<ffffffff812c4ea7>] xenbus_probe_node+0x129/0x1cf
>   [<ffffffff812c50a8>] xenbus_dev_changed+0x15b/0x18b
>   [<ffffffff8100f34f>] ? xen_restore_fl_direct_end+0x0/0x1
>   [<ffffffff8109002d>] ? lock_release+0x1ac/0x1b9
>   [<ffffffff8124d84f>] ? _raw_spin_unlock+0x8f/0x98
>   [<ffffffff812c5177>] backend_changed+0x3b/0x5b
>   [<ffffffff812c331e>] xenwatch_thread+0x111/0x14c
>   [<ffffffff8107c13e>] ? autoremove_wake_function+0x0/0x39
>   [<ffffffff812c320d>] ? xenwatch_thread+0x0/0x14c
>   [<ffffffff8107be20>] kthread+0x7f/0x87
>   [<ffffffff81013e9a>] child_rip+0xa/0x20
>   [<ffffffff810137d4>] ? restore_args+0x0/0x30
>   [<ffffffff8100f362>] ? check_events+0x12/0x20
>   [<ffffffff8100f362>] ? check_events+0x12/0x20
>   [<ffffffff81013e90>] ? child_rip+0x0/0x20
>
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