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



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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