Hi I use xen 4.0.1 and 2.6.32.23-170 by myoung, and create about 30 VMs in hypervisor When I try to migrate them randomly in the same time , I got the following kernel message or reboot in some machines Jan 26 06:27:23 nc-11 kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 Jan 26 06:27:23 nc-11 kernel: IP: [<ffffffff811efbc3>] inode_has_perm+0x65/0x90 Jan 26 06:27:23 nc-11 kernel: PGD 14886067 PUD 20c85067 PMD 0 Jan 26 06:27:23 nc-11 kernel: Oops: 0000 [#6] SMP Jan 26 06:27:23 nc-11 kernel: last sysfs file: /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map Jan 26 06:27:23 nc-11 kernel: CPU 3 Jan 26 06:27:23 nc-11 kernel: Modules linked in: xt_mac xt_physdev tun ceph libceph libcrc32c blktap fuse xt_temac 8021q garp ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat bridge stp llc sunrpc ipv6 xen_netback xen_blkback blkback_pagemap xen_gntdev xen_evtchn xenfs dcdbas bnx2 iTCO_wdt power_meter iTCO_vendor_support joydev usb_storage [last unloaded: scsi_wait_scan] Jan 26 06:27:23 nc-11 kernel: Pid: 5333, comm: ls Tainted: G D 2.6.32.23-170.Elaster.xendom0.fc12.x86_64 #1 PowerEdge R210 Jan 26 06:27:23 nc-11 kernel: RIP: e030:[<ffffffff811efbc3>] [<ffffffff811efbc3>] inode_has_perm+0x65/0x90 Jan 26 06:27:23 nc-11 kernel: RSP: e02b:ffff8800222ebd08 EFLAGS: 00010282 Jan 26 06:27:23 nc-11 kernel: RAX: ffff880003210d60 RBX: ffff880033f92cc0 RCX: ffff8800222ebda8 Jan 26 06:27:23 nc-11 kernel: RDX: 0000000000000010 RSI: ffff880068045d48 RDI: ffff88006ee560c0 Jan 26 06:27:23 nc-11 kernel: RBP: ffff8800222ebd98 R08: ffff8800222ebda8 R09: 0000000000000001 Jan 26 06:27:23 nc-11 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800b93eb300 Jan 26 06:27:23 nc-11 kernel: R13: ffff880068045d48 R14: 00007fff0de41f00 R15: 0000000000eea690 Jan 26 06:27:23 nc-11 kernel: FS: 00007f9ef2cff7a0(0000) GS:ffff88000c6be000(0000) knlGS:0000000000000000 Jan 26 06:27:23 nc-11 kernel: CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b Jan 26 06:27:23 nc-11 kernel: CR2: 0000000000000020 CR3: 00000000565b4000 CR4: 0000000000002660 Jan 26 06:27:23 nc-11 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jan 26 06:27:23 nc-11 kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Jan 26 06:27:23 nc-11 kernel: Process ls (pid: 5333, threadinfo ffff8800222ea000, task ffff88004587aea0) Jan 26 06:27:23 nc-11 kernel: Stack: Jan 26 06:27:23 nc-11 kernel: 0000000000100000 0000000000000000 ffffffff8100ef91 ffff8800222ebda8 Jan 26 06:27:23 nc-11 kernel: <0> ffffffff8100f6c2 0000000000100000 0000000000000001 0000000000000000 Jan 26 06:27:23 nc-11 kernel: <0> 0000000000000000 ffffea0002870200 ffffea000287f700 0000000000000000 Jan 26 06:27:23 nc-11 kernel: Call Trace: Jan 26 06:27:23 nc-11 kernel: [<ffffffff8100ef91>] ? xen_force_evtchn_callback+0xd/0xf Jan 26 06:27:23 nc-11 kernel: [<ffffffff8100f6c2>] ? check_events+0x12/0x20 Jan 26 06:27:23 nc-11 kernel: [<ffffffff8100f6af>] ? xen_restore_fl_direct_end+0x0/0x1 Jan 26 06:27:23 nc-11 kernel: [<ffffffff8110ef42>] ? kmem_cache_free+0x7e/0xb4 Jan 26 06:27:23 nc-11 kernel: [<ffffffff811f0030>] dentry_has_perm+0x5a/0x70 Jan 26 06:27:23 nc-11 kernel: [<ffffffff811f00c6>] selinux_inode_getattr+0x2c/0x2e Jan 26 06:27:23 nc-11 kernel: [<ffffffff811e9225>] security_inode_getattr+0x25/0x27 Jan 26 06:27:23 nc-11 kernel: [<ffffffff81121972>] vfs_getattr+0x25/0x66 Jan 26 06:27:23 nc-11 kernel: [<ffffffff8112d311>] ? filldir+0x0/0xc4 Jan 26 06:27:23 nc-11 kernel: [<ffffffff811219fe>] vfs_fstatat+0x4b/0x62 Jan 26 06:27:23 nc-11 kernel: [<ffffffff81121a70>] vfs_lstat+0x1e/0x20 Jan 26 06:27:23 nc-11 kernel: [<ffffffff81121a91>] sys_newlstat+0x1f/0x3d Jan 26 06:27:23 nc-11 kernel: [<ffffffff8145f495>] ? do_page_fault+0x2c2/0x2f2 Jan 26 06:27:23 nc-11 kernel: [<ffffffff810aa585>] ? audit_syscall_entry+0x11e/0x14a Jan 26 06:27:23 nc-11 kernel: [<ffffffff81012d32>] system_call_fastpath+0x16/0x1b Jan 26 06:27:23 nc-11 kernel: Code: 8b 96 30 02 00 00 44 8b 48 04 75 1f 4c 8d 85 70 ff ff ff b9 20 00 00 00 44 89 d8 4c 89 c7 f3 ab c6 85 70 ff ff ff 01 48 89 75 90 <41> 0f b7 42 20 41 8b 72 1c 89 d1 44 89 cf 89 c2 e8 3a e4 ff ff Jan 26 06:27:23 nc-11 kernel: RIP [<ffffffff811efbc3>] inode_has_perm+0x65/0x90 Jan 26 06:27:23 nc-11 kernel: RSP <ffff8800222ebd08> Jan 26 06:27:23 nc-11 kernel: CR2: 0000000000000020 Jan 26 06:27:23 nc-11 kernel: ---[ end trace b4379c3d3e1ecb00 ]--- It''s a bug of kernel or xen or anything? Thanks TREND MICRO EMAIL NOTICE The information contained in this email and any attachments is confidential and may be subject to copyright or other intellectual property protection. If you are not the intended recipient, you are not authorized to use or disclose this information, and we request that you notify us by reply mail or telephone and delete the original message from your mail system. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel