[Xen-devel] BUG: scheduling while atomic: xenwatch

[Liwei <xieliwei@xxxxxxxxx>]

Hello list,
    I've been receiving these bug traces in my kernel logs since
switching from Debian's kernel/xen packages to compiling my own
kernel/xen. They don't seem to cause any visible trouble so I didn't
bother to report them before, but I thought I'd report them today. The
bug traces do not occur when using Debian packages.

[ 1423.038710] Pid: 31, comm: xenwatch Not tainted
3.0.0-rc4-custom-xen-amd64+ #1
[ 1423.038713] Call Trace:
[ 1423.038718]  [<ffffffff8131bd1d>] ? __schedule_bug+0x3e/0x52
[ 1423.038722]  [<ffffffff8132153a>] ? schedule+0x90/0x64e
[ 1423.038727]  [<ffffffff81006b4d>] ? xen_force_evtchn_callback+0x9/0xa
[ 1423.038732]  [<ffffffff810071b2>] ? check_events+0x12/0x20
[ 1423.038737]  [<ffffffff811fcfd5>] ? read_reply+0xa4/0x123
[ 1423.038742]  [<ffffffff8106060f>] ? add_wait_queue+0x3c/0x3c
[ 1423.038747]  [<ffffffff811fd0f9>] ? xs_talkv+0xa5/0x167
[ 1423.038752]  [<ffffffff811fd61a>] ? xenbus_write+0x73/0x94
[ 1423.038756]  [<ffffffff811fd6d6>] ? xenbus_printf+0x9b/0xbf
[ 1423.038761]  [<ffffffff811b8927>] ? xen_pcibk_publish_pci_dev+0xa2/0xa2
[ 1423.038766]  [<ffffffff811b8a4a>] ? xen_pcibk_publish_pci_root+0x123/0x180
[ 1423.038771]  [<ffffffff810e5f99>] ? virt_to_head_page+0x6/0x29
[ 1423.038775]  [<ffffffff811fd6e2>] ? xenbus_printf+0xa7/0xbf
[ 1423.038780]  [<ffffffff811ba648>] ? xen_pcibk_publish_pci_roots+0x7f/0xab
[ 1423.038785]  [<ffffffff811b8d56>] ? xen_pcibk_setup_backend+0x1e4/0x252
[ 1423.038791]  [<ffffffff811b9258>] ? xen_pcibk_xenbus_probe+0xde/0xfe
[ 1423.038795]  [<ffffffff811fe2ce>] ? xenbus_dev_probe+0x6f/0xf6
[ 1423.038800]  [<ffffffff81230589>] ? driver_probe_device+0xa8/0x138
[ 1423.038805]  [<ffffffff81230688>] ? __driver_attach+0x6f/0x6f
[ 1423.038810]  [<ffffffff8122f617>] ? bus_for_each_drv+0x47/0x7b
[ 1423.038814]  [<ffffffff812304aa>] ? device_attach+0x6f/0x8f
[ 1423.038818]  [<ffffffff8122fddb>] ? bus_probe_device+0x1f/0x37
[ 1423.038823]  [<ffffffff8122e771>] ? device_add+0x3e7/0x587
[ 1423.038828]  [<ffffffff8103f759>] ? get_parent_ip+0x9/0x1b
[ 1423.038832]  [<ffffffff812371b9>] ? pm_runtime_init+0xb5/0xc9
[ 1423.038837]  [<ffffffff811fe5f8>] ? xenbus_probe_node+0x137/0x1d5
[ 1423.038842]  [<ffffffff811fe81e>] ? xenbus_dev_changed+0x157/0x189
[ 1423.038847]  [<ffffffff8103f759>] ? get_parent_ip+0x9/0x1b
[ 1423.038852]  [<ffffffff811fcf00>] ? xenwatch_thread+0xf5/0x126
[ 1423.038856]  [<ffffffff8106060f>] ? add_wait_queue+0x3c/0x3c
[ 1423.038861]  [<ffffffff811fce0b>] ? xenbus_thread+0x211/0x211
[ 1423.038865]  [<ffffffff8105ff6e>] ? kthread+0x76/0x7e
[ 1423.038869]  [<ffffffff813295a4>] ? kernel_thread_helper+0x4/0x10
[ 1423.038874]  [<ffffffff813286b3>] ? int_ret_from_sys_call+0x7/0x1b
[ 1423.038879]  [<ffffffff813233e5>] ? retint_restore_args+0x5/0x6
[ 1423.038883]  [<ffffffff813295a0>] ? gs_change+0x13/0x13
[ 1423.039097] BUG: scheduling while atomic: xenwatch/31/0x00000002
[ 1423.039147] Modules linked in: tun xt_physdev iptable_filter
ip_tables x_tables parport_pc ppdev lp parport bluetooth rfkill
cpufreq_userspace cpufreq_pow
ersave cpufreq_stats cpufreq_conservative mperf binfmt_misc fuse nfsd
exportfs nfs lockd fscache auth_rpcgss nfs_acl sunrpc bridge stp ext3
jbd loop firewire
_sbp2 firewire_core crc_itu_t cxgb3 mdio i2c_i801 i2c_core mxm_wmi
psmouse evdev pcspkr serio_raw thermal_sys wmi button acpi_processor
ext4 mbcache jbd2 crc
16 dm_mod sg sd_mod sr_mod crc_t10dif cdrom ahci libahci mvsas libsas
sky2 libata scsi_transport_sas scsi_mod [last unloaded:
scsi_wait_scan]

    Haven't really checked and confirmed, but they seem to occur on
starting and stopping VMs.
Xen:
# hg log|head
changeset:   23632:33717472f37e
tag:         tip
user:        Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
date:        Tue Jun 28 18:15:44 2011 +0100
summary:     libxc: Squash xc_e820.h (and delete) into xenctrl.h

Kernel:
# git log|head
commit 3dc33d5af47bd3e216f71f47f1f4c7ea4578cca4
Merge: bd687c5 bccaeaf
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Date:   Thu Jun 23 17:10:21 2011 -0700

Liwei

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