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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Jun 29, 2011 at 09:24:20PM +0800, Liwei wrote:
> 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.

Thanks for reporting it. I've a patch for it ready.

What tree did you pull from?
> 
> [ 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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> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel

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