From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755834Ab0GHQpI (ORCPT ); Thu, 8 Jul 2010 12:45:08 -0400 Received: from lo.gmane.org ([80.91.229.12]:39387 "EHLO lo.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754776Ab0GHQpG (ORCPT ); Thu, 8 Jul 2010 12:45:06 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Michael Leun Subject: sysfs bug when using tun with network namespaces Date: Thu, 8 Jul 2010 16:40:09 +0000 (UTC) Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: sea.gmane.org User-Agent: Loom/3.14 (http://gmane.org/) X-Loom-IP: 109.91.220.65 (Mozilla/5.0 (X11; U; Linux i686; de; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, > # tunctl -u ml -t tap1 works as expected, but > # unshare -n /bin/bash > # tunctl -u ml -t tap1 Jul 8 18:03:59 doris kernel: ------------[ cut here ]------------ Jul 8 18:03:59 doris kernel: kernel BUG at fs/sysfs/file.c:540! Jul 8 18:03:59 doris kernel: invalid opcode: 0000 [#1] PREEMPT SMP Jul 8 18:03:59 doris kernel: last sysfs file: /sys/devices/virtual/misc/tun/dev Jul 8 18:03:59 doris kernel: Modules linked in: tun snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device vboxnetadp vboxnetflt vboxdrv ipv6 cpufreq_conservative cpufreq_ondemand cpufreq_userspace cpufreq_powersave acpi_cpufreq speedstep_lib freq_table ipt_REJECT ipt_LOG xt_limit xt_recent xt_state xt_tcpudp iptable_mangle iptable_nat iptable_filter nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp nf_conntrack ip_tables x_tables fuse nls_utf8 loop snd_hda_codec_realtek arc4 snd_hda_intel ecb snd_hda_codec iwlagn snd_pcm iwlcore snd_timer mac80211 snd cfg80211 soundcore intel_agp video usb_storage agpgart i2c_i801 rfkill snd_page_alloc output button battery ac joydev sg evdev tg3 edd ext4 jbd2 crc16 sha256_generic aes_i586 aes_generic cbc dm_crypt linear rtc_cmos uhci_hcd rtc_core rtc_lib sd_mod crc_t10dif ehci_hcd usbcore dm_snapshot dm_mod fan processor thermal [last unloaded: tun] Jul 8 18:03:59 doris kernel: Jul 8 18:03:59 doris kernel: Pid: 4320, comm: tunctl Not tainted 2.6.34.1 #3 Kuril /40684JG Jul 8 18:03:59 doris kernel: EIP: 0060:[] EFLAGS: 00010246 CPU: 0 Jul 8 18:03:59 doris kernel: EIP is at sysfs_create_file+0x21/0x30 Jul 8 18:03:59 doris kernel: EAX: 00000000 EBX: f66a73c0 ECX: f66a72bc EDX: f81587b4 Jul 8 18:03:59 doris kernel: ESI: 00000000 EDI: f67a7f00 EBP: f68ade90 ESP: f68ade90 Jul 8 18:03:59 doris kernel: DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 Jul 8 18:03:59 doris kernel: Process tunctl (pid: 4320, ti=f68ac000 task=f66e8f40 task.ti=f68ac000) Jul 8 18:03:59 doris kernel: Stack: Jul 8 18:03:59 doris kernel: f68ade98 c03e6da3 f68adf00 f8157fe0 f8158700 f48496c0 00000001 f66a7000 Jul 8 18:03:59 doris kernel: <0> f6b63c00 bfe0fafc f68aded0 00000000 00000000 000000ca b777a000 c1fbcca0 Jul 8 18:03:59 doris kernel: <0> 356e7574 00000000 00000000 00000000 00001001 00000000 00000000 00000000 Jul 8 18:03:59 doris kernel: Call Trace: Jul 8 18:03:59 doris kernel: [] ? device_create_file+0x13/0x20 Jul 8 18:03:59 doris kernel: [] ? tun_chr_ioctl+0x820/0xa26 [tun] Jul 8 18:03:59 doris kernel: [] ? vfs_ioctl+0x2d/0xc0 Jul 8 18:03:59 doris kernel: [] ? tun_chr_ioctl+0x0/0xa26 [tun] Jul 8 18:03:59 doris kernel: [] ? do_vfs_ioctl+0x6a/0x5a0 Jul 8 18:03:59 doris kernel: [] ? do_page_fault+0x0/0x370 Jul 8 18:03:59 doris kernel: [] ? do_page_fault+0x1b4/0x370 Jul 8 18:03:59 doris kernel: [] ? alloc_fd+0xba/0x100 Jul 8 18:03:59 doris kernel: [] ? putname+0x26/0x40 Jul 8 18:03:59 doris kernel: [] ? do_sys_open+0xee/0x110 Jul 8 18:03:59 doris kernel: [] ? sys_ioctl+0x5f/0x80 Jul 8 18:03:59 doris kernel: [] ? sys_open+0x29/0x40 Jul 8 18:03:59 doris kernel: [] ? sysenter_do_call+0x12/0x22 Jul 8 18:03:59 doris kernel: Code: 00 00 00 00 8d bf 00 00 00 00 55 85 c0 89 e5 74 1a 8b 40 18 85 d2 74 13 85 c0 74 0f b9 02 00 00 00 e8 34 ff ff ff c9 8d 76 00 c3 <0f> 0b eb fe 8d 74 26 00 8d bc 27 00 00 00 00 55 89 e5 57 31 ff Jul 8 18:03:59 doris kernel: EIP: [] sysfs_create_file+0x21/0x30 SS:ESP 0068:f68ade90 Jul 8 18:03:59 doris kernel: ---[ end trace 3ce86c182470888c ]--- No vmlinux specified, assuming /lib/modules/2.6.34.1/build/vmlinux c03129c3: 89 e5 mov %esp,%ebp | %esp = f68ade90 c03129c5: 74 1a je c03129e1 c03129c7: 8b 40 18 mov 0x18(%eax),%eax c03129ca: 85 d2 test %edx,%edx | %edx => f81587b4 c03129cc: 74 13 je c03129e1 c03129ce: 85 c0 test %eax,%eax | %eax => 0 c03129d0: 74 0f je c03129e1 c03129d2: b9 02 00 00 00 mov $0x2,%ecx | %ecx => f66a72bc c03129d7: e8 34 ff ff ff call c0312910 c03129dc: c9 leave c03129dd: 8d 76 00 lea 0x0(%esi),%esi | %esi => 0 c03129e0: c3 ret *c03129e1: 0f 0b ud2a <--- faulting instruction c03129e3: eb fe jmp c03129e3 c03129e5: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi c03129e9: 8d bc 27 00 00 00 00 lea 0x0(%edi,%eiz,1),%edi c03129f0 : c03129f0: 55 push %ebp c03129f1: 89 e5 mov %esp,%ebp c03129f3: 57 push %edi c03129f4: 31 ff xor %edi,%edi c03129f6: 56 push %esi c03129f7: 89 d6 mov %edx,%esi c03129f9: 53 push %ebx c03129fa: 31 db xor %ebx,%ebx c03129fc: 83 ec 04 sub $0x4,%esp c03129ff: 89 45 f0 mov %eax,-0x10(%ebp) c0312a02: 8b 12 mov (%edx),%edx c0312a04: 85 d2 test %edx,%edx c0312a06: 74 3b je c0312a43 c0312a08: 90 nop c0312a09: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi c0312a10: 8b 45 f0 mov -0x10(%ebp),%eax c0312a13: e8 a8 ff ff ff call c03129c0 -- Best Regards, Michael