Hi, Same thing happens here running linux-image-2.6.32-5-openvz-686 (2.6.32-12).
It is easy to reproduce and it happens every time: 1. modprobe tun in CT0 2. Start CT which uses tun (openvpn here) 3. Kernel logs the following messages, system load goes up continuously and there is no way to stop openvz CTs other than hard resetting the server: Sep 8 20:13:56 server kernel: [1895324.839666] ------------[ cut here ]------------ Sep 8 20:13:56 server kernel: [1895324.842934] kernel BUG at /tmp/buildd/linux-2.6-2.6.32/debian/build/source_i386_openvz/fs/sysfs/file.c:541! Sep 8 20:13:56 server kernel: [1895324.842934] invalid opcode: 0000 [#1] SMP Sep 8 20:13:56 server kernel: [1895325.067037] last sysfs file: /sys/devices/virtual/net/lo/operstate Sep 8 20:13:56 server kernel: [1895325.067037] Modules linked in: tun vzethdev vznetdev simfs vzrst vzcpt vzmon xt_length xt_hl xt_tcpmss xt_TCPMSS iptable_mangle xt_dscp ipt_REJECT ocfs2 jbd2 quota_tree vzdquota vzdev drbd lru_cache cn ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs ipt_LOG xt_limit xt_physdev xt_multiport xt_tcpudp xt_state iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_filter ip_tables x_tables bridge stp ext3 jbd mbcache kvm_intel kvm loop i915 drm_kms_helper snd_pcm drm snd_timer snd soundcore i2c_algo_bit snd_page_alloc tpm_tis i2c_core asus_atk0110 tpm tpm_bios rng_core pcspkr video output evdev button processor jfs raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx raid1 md_mod dm_mod sd_mod crc_t10dif ata_generic uhci_hcd ehci_hcd ata_piix 8139too mii libata thermal thermal_sys scsi_mod atl1e usbcore nls_base [last unloaded: simfs] Sep 8 20:13:56 server kernel: [1895326.021545] Sep 8 20:13:56 server kernel: [1895326.021545] Pid: 13795, comm: openvpn Not tainted (2.6.32-5-openvz-686 #1) avdeyev System Product Name) Sep 8 20:13:56 server kernel: [1895326.021545] EIP: 0060:[<c1100d60>] EFLAGS: 00210246 CPU: 0 Sep 8 20:13:56 server kernel: [1895326.021545] EIP is at sysfs_create_file+0x29/0x37 Sep 8 20:13:56 server kernel: [1895326.021545] EAX: 00000000 EBX: 00000000 ECX: f6b6d26c EDX: fa33306c Sep 8 20:13:56 server kernel: [1895326.021545] ESI: f6b6d3c0 EDI: f6b6d000 EBP: bfeb4bbc ESP: ee7c5ed4 Sep 8 20:13:56 server kernel: [1895326.021545] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 Sep 8 20:13:56 server kernel: [1895326.021545] Process openvpn (pid: 13795, veid: 207, ti=ee7c4000 task=da9a39c0 task.ti=ee7c4000) Sep 8 20:13:56 server kernel: [1895326.021545] Stack: Sep 8 20:13:56 server kernel: [1895326.021545] fa331c6b d8e6f6c0 d94b0000 f2549604 00000000 00000001 00200046 c3e03ac0 Sep 8 20:13:56 server kernel: [1895326.021545] <0> d04e6400 00000003 00000000 00000000 00000000 00000000 00003001 00000000 Sep 8 20:13:56 server kernel: [1895326.021545] <0> 00000000 00000000 dc6cc8cf fa3319f1 d8e6f6c0 bfeb4bbc 400454ca c10c9584 Sep 8 20:13:56 server kernel: [1895326.021545] Call Trace: Sep 8 20:13:56 server kernel: [1895326.021545] [<fa331c6b>] ? tun_chr_ioctl+0x27a/0x7dc [tun] Sep 8 20:13:56 server kernel: [1895326.021545] [<fa3319f1>] ? tun_chr_ioctl+0x0/0x7dc [tun] Sep 8 20:13:56 server kernel: [1895326.021545] [<c10c9584>] ? vfs_ioctl+0x1c/0x5f Sep 8 20:13:56 server kernel: [1895326.021545] [<c10c9b18>] ? do_vfs_ioctl+0x4aa/0x4e5 Sep 8 20:13:56 server kernel: [1895326.021545] [<c10bd325>] ? fd_install+0x1e/0x3c Sep 8 20:13:56 server kernel: [1895326.021545] [<c10bd527>] ? do_sys_open+0xd4/0xdf Sep 8 20:13:56 server kernel: [1895326.021545] [<c10bd527>] ? do_sys_open+0xd4/0xdf Sep 8 20:13:56 server kernel: [1895326.021545] [<c10c9b7f>] ? sys_ioctl+0x2c/0x42 Sep 8 20:13:56 server kernel: [1895326.021545] [<c1008120>] ? syscall_call+0x7/0xb Sep 8 20:13:56 server kernel: [1895326.021545] Code: 5f c3 89 c1 64 a1 fc b0 41 c1 8b 80 80 04 00 00 83 b8 90 00 00 00 00 75 03 31 c0 c3 85 c9 74 0b 8b 41 18 85 c0 74 04 85 d2 75 04 <0f> 0b eb fe b9 02 00 00 00 e9 52 ff ff ff 56 53 89 c3 b8 48 d0 Sep 8 20:13:56 server kernel: [1895327.923848] ---[ end trace d057c07c37bc53ce ]--- Best regards, Fernando Sanchez
