RHEL 5.5 Host crashes when running a RHEL 4.8 guest.
Issue
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RHEL5.5 x86_64 Virtual Host running a RHEL4.8 i386 guest locks up the machine and giving following error in message files.
Oct 26 10:16:36 hostname kernel: Kernel BUG at drivers/net/tun.c:476 Oct 26 10:16:36 hostname kernel: invalid opcode: 0000 [1] SMP Oct 26 10:16:36 hostname kernel: last sysfs file: /devices/pci0000:00/0000:00:06.0/0000:05:00.1/irq Oct 26 10:16:36 hostname kernel: CPU 14 Oct 26 10:16:36 hostname kernel: Modules linked in: mptctl mptbase vfat fat tun usb_storage ipmi_devintf ipmi_si ipmi_msghandler dell_rbu nfs fscache nfs_acl lockd sunrpc bridge bonding be2iscsi ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp bnx2i cnic ipv6 xfrm_nalgo crypto_api uio cxgb3i cxgb3 libiscsi_tcp libiscsi2 scsi_transport_iscsi2 scsi_transport_iscsi loop dm_multipath scsi_dh video backlight sbs power_meter hwmon i2c_ec i2c_core dell_wmi wmi button battery asus_acpi acpi_memhotplug ac parport_pc lp parport ksm(U) kvm_intel(U) kvm(U) joydev sr_mod cdrom sg igb 8021q bnx2 dca serio_raw pcspkr dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod ata_piix libata shpchp megaraid_sas sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd Oct 26 10:16:36 hostname kernel: Pid: 11765, comm: qemu-kvm Tainted: G 2.6.18-194.17.1.el5 #1 Oct 26 10:16:36 hostname kernel: RIP: 0010:[<ffffffff8871a7d9>] [<ffffffff8871a7d9>] :tun:tun_chr_readv+0x2b1/0x3a6 Oct 26 10:16:36 hostname kernel: RSP: 0018:ffff81018e6d5e48 EFLAGS: 00010246 Oct 26 10:16:36 hostname kernel: RAX: 0000000000000000 RBX: ffff81018e6d5e98 RCX: 0000000051000101 Oct 26 10:16:36 hostname kernel: RDX: ffff81039080e700 RSI: ffff81018e6d5e9e RDI: ffff81018e6d5e92 Oct 26 10:16:36 hostname kernel: RBP: 0000000000010ff6 R08: 0000000000000000 R09: 0000000000000001 Oct 26 10:16:36 hostname kernel: R10: ffff81018e6d5e94 R11: 0000000000000202 R12: ffff8103ccee76c0 Oct 26 10:16:36 hostname kernel: R13: ffff81019f7dc500 R14: 0000000000000000 R15: ffff81018e6d5ef8 Oct 26 10:16:36 hostname kernel: FS: 00002affa8026f80(0000) GS:ffff81023717e440(0000) knlGS:0000000000000000 Oct 26 10:16:36 hostname kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Oct 26 10:16:36 hostname kernel: CR2: 00000000006dd45b CR3: 00000001a83a5000 CR4: 00000000000026e0 Oct 26 10:16:36 hostname kernel: Process qemu-kvm (pid: 11765, threadinfo ffff81018e6d4000, task ffff81022f841040) Oct 26 10:16:36 hostname kernel: Stack: 000000004cc6e2c3 ffff81022dac3380 0000000000000000 ffff81022f841040 Oct 26 10:16:36 hostname kernel: ffffffff8008cf9d ffff81019f7dc530 ffff81019f7dc530 ffff81022d02fc80 Oct 26 10:16:36 hostname kernel: 0000055005860000 00000000c0080000 00005d5e25005254 0000000000000007 Oct 26 10:16:36 hostname kernel: Call Trace: Oct 26 10:16:36 hostname kernel: [<ffffffff8008cf9d>] default_wake_function+0x0/0xe Oct 26 10:16:36 hostname kernel: [<ffffffff8004214d>] do_ioctl+0x21/0x6b Oct 26 10:16:36 hostname kernel: [<ffffffff8871a8e8>] :tun:tun_chr_read+0x1a/0x1f Oct 26 10:16:36 hostname kernel: [<ffffffff8000b729>] vfs_read+0xcb/0x171 Oct 26 10:16:36 hostname kernel: [<ffffffff80011c3b>] sys_read+0x45/0x6e Oct 26 10:16:36 hostname kernel: [<ffffffff8005d28d>] tracesys+0xd5/0xe0
Environment
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Red Hat Enterprise Linux 5.5 (KVM Host)
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Red Hat Enterprise LInux 4.8 32-bit (guest)
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