I have recently upgraded Citrix XenServer from 5.5 to 5.6 (from 2.6.18-128.1.6.el5.xs5.5.0.505.1024xen to 2.6.27.42-0.1.1.xs5.6.0.44.111158xen) and when the system either brings up, or shuts down a vlan tagged interface, the below stack trace appears and system halts.
This problem is intermittent, it doesn't happen every time, but it's quite reliably reproducible by starting/stopping OS.
Shutting down interface eth4.443: BUG: unable to handle kernel NULL pointer dereference at 00000010
IP: [<c0337695>] __vlan_hwaccel_rx+0x75/0x160
Oops: 0000 [#1] SMP
last sysfs file: /sys/class/iscsi_session/session1/ifacename
Modules linked in: nfs nfs_acl lockd sunrpc 8021q bridge stp llc(N) ipt_REJECT nf_conntrack_ipv4 xt_state nf_conntrack xt_tcpudp iptable_filter ip_tables x_tables binfmt_misc nls_utf8 isofs(N) dm_mirror dm_log dm_mod sbs sbshc fan dock container battery ac parport_pc lp parport nvram igb evdev(N) thermal button processor thermal_sys bnx2 serio_raw zlib_inflate(N) rtc_cmos rtc_core rtc_lib 8250_pnp 8250 serial_core pcspkr ide_generic ide_disk mptsas scsi_transport_sas mppVhba mptscsih mptbase mppUpper sg sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd usbcore fbcon(N) font(N) tileblit(N) bitblit(N) softcursor(N) [last unloaded: scsi_transport_iscsi]
Supported: No
Pid: 31322, comm: vconfig Tainted: G (2.6.27.42-0.1.1.xs5.6.0.44.111158xen #1)
EIP: 0061:[<c0337695>] EFLAGS: 00010247 CPU: 0
EIP is at __vlan_hwaccel_rx+0x75/0x160
EAX: 00000000 EBX: eeb47c00 ECX: 0000013f EDX: 00000000
ESI: 00000000 EDI: 0000013f EBP: eb9a7d6c ESP: eb9a7d5c
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0069
Process vconfig (pid: 31322, ti=eb9a6000 task=eba3f030 task.ti=eb9a6000)
Stack: 00000000 000000e6 eeb6a4c0 eeb47c00 eb9a7e48 f02ba946 00000001 00000002
c16bdb00 00000000 eac84900 00000002 00000942 00000000 00000005 01025e93
eb9a7db0 c01d002c eb0f4000 00000040 ee060dcc eced85c0 eeb6a4c0 ee060dc0
Call Trace:
[<f02ba946>] ? igb_poll+0x8e6/0xc90 [igb]
[<c01d002c>] ? release_sysfs_dirent+0x1c/0xc0
[<c0346ee5>] ? schedule_timeout+0x75/0xc0
[<c025b715>] ? device_release+0x15/0x70
[<c0346ce2>] ? wait_for_completion+0x12/0x20
[<c02d44a5>] ? net_rx_action+0x165/0x250
[<c012e322>] ? __do_softirq+0xb2/0x160
[<c012e457>] ? do_softirq+0x87/0x90
[<c012e77b>] ? irq_exit+0x3b/0x50
[<c026d0ec>] ? evtchn_do_upcall+0x1dc/0x1f0
[<c02c5620>] ? sock_ioctl+0x0/0x220
[<c0105565>] ? hypervisor_callback+0x41/0x49
[<c02c5620>] ? sock_ioctl+0x0/0x220
[<f036fa79>] ? vlan_ioctl_handler+0xa9/0x390 [8021q]
[<c02c57d0>] ? sock_ioctl+0x1b0/0x220
[<c02c5620>] ? sock_ioctl+0x0/0x220
[<c0191458>] ? vfs_ioctl+0x28/0x80
[<c0191507>] ? do_vfs_ioctl+0x57/0x290
[<c02c74ff>] ? sys_socketcall+0x6f/0x290
[<c0182bb9>] ? filp_close+0x49/0x70
[<c01917a0>] ? sys_ioctl+0x60/0x70
[<c01053ce>] ? syscall_call+0x7/0xb
=======================
Code: 00 00 8d 74 26 00 0f b7 81 c6 00 00 00 a8 04 75 55 89 f9 8b 75 f0 66 81 e1 ff 0f 89 c8 66 c1 e8 09 0f b7 c0 66 89 bb 88 00 00 00 <8b> 54 86 10 31 c0 85 d2 74 0a 89 c8 25 ff 01 00 00 8b 04 82 89
EIP: [<c0337695>] __vlan_hwaccel_rx+0x75/0x160 SS:ESP 0069:eb9a7d5c
--
Greg Trahair | Lead System Engineer | TomTom
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