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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1765

Summary: Got a NULL pointer dereference
Product: Xen
Version: unspecified
Platform: Other
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Cloud Xen
AssignedTo: xen-bugs@lists.xensource.com
ReportedBy: shuklin@selectel.ru


XCP 0.5, got in dom0:

BUG: unable to handle kernel NULL pointer dereference at 0000002e
IP: [<c01cfe8a>] sysfs_addrm_start+0x2a/0x90
*pdpt = 0000000000000000
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/xen-backend/tap-1-51712/statistics/wr_req
Modules linked in: iscsi_tcp libiscsi scsi_transport_iscsi nfs lockd nfs_acl
sunrpc bridge stp openvswitch_mod(N) llc(N) ipt_REJECT nf_conntrack_ipv4
xt_state nf_conntrack xt_tcpudp iptable_filter ip_tables x_tables binfmt_misc
dm_mirror dm_log dm_mod sbs sbshc fan container battery ac parport_pc lp
parport nvram evdev(N) usbhid ff_memless sg thermal button processor
thermal_sys ixgbe rtc_cmos i2c_i801 rtc_core serio_raw e1000e rtc_lib i2c_core
8250_pnp 8250 serial_core pcspkr ide_generic ide_disk ahci libata sd_mod
scsi_mod dock ext3 jbd uhci_hcd ohci_hcd ehci_hcd usbcore fbcon(N) font(N)
tileblit(N) bitblit(N) softcursor(N)
Supported: No

Pid: 47, comm: xenwatch Tainted: G        
 (2.6.27.42-0.1.1.xs0.5.0.47.111160xen #1)
EIP: 0061<c01cfe8a>] EFLAGS: 00010246 CPU: 0
EIP is at sysfs_addrm_start+0x2a/0x90
EAX: c043a084 EBX: 0000000e ECX: 00000000 EDX: 0000000e
ESI: ee98ddcc EDI: ee98dddc EBP: ee98ddc4 ESP: ee98ddb4
DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
Process xenwatch (pid: 47, ti=ee98c000 task=ee8d8430 task.ti=ee98c000)
Stack: 00000001 0000000e ee98ddcc ee8519f0 ee98dde8 c01ceb98 0000000e 00000000
      00000000 00000000 ee8519cc ee8519c0 00000006 ee98ddf0 c01d0c86
ee98de00
      f04c5d76 ee8519c0 ee8519c0 ee98de2c f04c3dc7 c04489e0 c0448abc
00000040
Call Trace:
[<c01ceb98>] ? sysfs_hash_and_remove+0x28/0x70
[<c01d0c86>] ? sysfs_remove_link+0x16/0x20
[<f04c5d76>] ? dp_sysfs_del_if+0x26/0x50 [openvswitch_mod]
[<f04c3dc7>] ? dp_del_port+0x157/0x190 [openvswitch_mod]
[<f04c56ac>] ? dp_device_event+0xcc/0xe0 [openvswitch_mod]
[<c0141e07>] ? notifier_call_chain+0x37/0x70
[<c0141ec9>] ? __raw_notifier_call_chain+0x19/0x20
[<c0141eea>] ? raw_notifier_call_chain+0x1a/0x20
[<c02d2941>] ? call_netdevice_notifiers+0x11/0x20
[<c02d2f3f>] ? rollback_registered+0x8f/0x110
[<c02006b5>] ? __next_cpu+0x15/0x30
[<c02d2fd9>] ? unregister_netdevice+0x19/0x70
[<c03471cb>] ? mutex_lock+0xb/0x20
[<c02d3042>] ? unregister_netdev+0x12/0x20
[<c0288f01>] ? netif_disconnect+0xa1/0x150
[<c0273348>] ? xenbus_rm+0x48/0x60
[<c02884b9>] ? frontend_changed+0x289/0x670
[<c027348a>] ? xenbus_gather+0x6a/0xb0
[<c0271cd5>] ? xenbus_read_driver_state+0x35/0x50
[<c0273f62>] ? otherend_changed_common+0x62/0x70
[<c0273fce>] ? otherend_changed+0x4e/0x50
[<c02734d0>] ? xenwatch_thread+0x0/0x160
[<c0272bdd>] ? xenwatch_handle_callback+0x1d/0x60
[<c0273605>] ? xenwatch_thread+0x135/0x160
[<c0272bc0>] ? xenwatch_handle_callback+0x0/0x60
[<c013de50>] ? autoremove_wake_function+0x0/0x50
[<c013daf2>] ? kthread+0x42/0x70
[<c013dab0>] ? kthread+0x0/0x70
[<c010569b>] ? kernel_thread_helper+0x7/0x10
=======================
Code: 00 55 b9 04 00 00 00 89 e5 83 ec 10 89 75 f8 89 c6 31 c0 89 5d f4 89 d3
89 7d fc 89 f7 f3 ab b8 84 a0 43 c0 89 16 e8 36 73 17 00 <8b> 53 20 b9 70 fa 1c
c0 a1 00 bb 51 c0 89 1c 24 e8 81 92 fc ff
EIP: [<c01cfe8a>] sysfs_addrm_start+0x2a/0x90 SS:ESP 0069:ee98ddb4
---[ end trace be9d4c9a1e5242d6 ]---


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