This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- precise' to 'verification-done-precise'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-precise -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1021471 Title: clone() hang when creating new network namespace (dmesg show unregister_netdevice: waiting for lo to become free. Usage count = 2) Status in The Linux Kernel: Confirmed Status in “linux” package in Ubuntu: Fix Released Status in “linux” source package in Precise: Fix Committed Status in “linux” source package in Quantal: Fix Released Bug description: SRU Justification: Impact: When creating new network namespace dmesg can show the following unregister_netdevice: waiting for lo to become free. Usage count = 1 Fix: Stefan Bader's SAUCE patch has fixed this for Quantal: UBUNTU: SAUCE: net/ipv4: Always flush route cache on unregister batch call Testcase: The sourcecode found here: https://lists.debian.org/debian-kernel/2012/05/msg00494.html can be compiled and run as follows: sudo ./reproducer #ctrl+c sudo ./reproducer #wait for a while dmesg | grep unregister -- I'm not sure how I triggered this. I've been moving around between networks and suspending/resuming all day. Earlier in this boot I successfully used a container (start, networking and stop). I came to start the same one later and noticed that it didn't come up. Trying to attach to the console with lxc- console informed me that it wasn't running. I then saw suspicious content in dmesg: [25800.412234] INFO: task lxc-start:25817 blocked for more than 120 seconds. [25800.412243] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [25800.412254] lxc-start D ffff88013fd13980 0 25817 1 0x00000000 [25800.412266] ffff880007b43cc0 0000000000000086 ffff88003ba4c500 ffff880007b43fd8 [25800.412275] ffff880007b43fd8 ffff880007b43fd8 ffff880134c65c00 ffff88003ba4c500 [25800.412284] 000080d0ffffffff ffffffff81ca7c00 ffff88003ba4c500 ffffffff81ca7c04 [25800.412288] Call Trace: [25800.412306] [<ffffffff81673759>] schedule+0x29/0x70 [25800.412313] [<ffffffff81673a1e>] schedule_preempt_disabled+0xe/0x10 [25800.412323] [<ffffffff81672537>] __mutex_lock_slowpath+0xd7/0x150 [25800.412331] [<ffffffff8167200a>] mutex_lock+0x2a/0x50 [25800.412340] [<ffffffff8155ede1>] copy_net_ns+0x71/0x100 [25800.412350] [<ffffffff8107adfb>] create_new_namespaces+0xdb/0x190 [25800.412357] [<ffffffff8107afec>] copy_namespaces+0x8c/0xd0 [25800.412367] [<ffffffff81050142>] copy_process.part.22+0x902/0x1520 [25800.412375] [<ffffffff81050ee5>] do_fork+0x135/0x390 [25800.412385] [<ffffffff8116db40>] ? kmem_cache_free+0x20/0x100 [25800.412395] [<ffffffff8118c6b3>] ? putname+0x33/0x50 [25800.412402] [<ffffffff811811cc>] ? do_sys_open+0x16c/0x200 [25800.412410] [<ffffffff8101c238>] sys_clone+0x28/0x30 [25800.412418] [<ffffffff8167cbf3>] stub_clone+0x13/0x20 [25800.412424] [<ffffffff8167c8e9>] ? system_call_fastpath+0x16/0x1b [25806.312385] unregister_netdevice: waiting for lo to become free. Usage count = 1 ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: linux-image-generic 3.5.0.3.3 ProcVersionSignature: Ubuntu 3.5.0-2.2-generic 3.5.0-rc4 Uname: Linux 3.5.0-2-generic x86_64 NonfreeKernelModules: nvidia wl AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25. ApportVersion: 2.2.5-0ubuntu2 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: NVidia [HDA NVidia], device 0: Cirrus Analog [Cirrus Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: laney 2787 F.... pulseaudio CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. Card0.Amixer.info: Card hw:0 'NVidia'/'HDA NVidia at 0xd3480000 irq 22' Mixer name : 'Nvidia MCP89 HDMI' Components : 'HDA:10134206,106b0d00,00100301 HDA:10de000c,10de0101,00100200' Controls : 37 Simple ctrls : 13 Date: Thu Jul 5 21:26:08 2012 HibernationDevice: RESUME=UUID=1c5b3f2c-2c89-4fa1-9ed8-0e238de8fe47 InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100729) MachineType: Apple Inc. MacBookPro7,1 ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-2-generic root=UUID=2228fdfe-3834-40b2-b7b4-efea7463e3c1 ro quiet splash reboot=pci vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.5.0-2-generic N/A linux-backports-modules-3.5.0-2-generic N/A linux-firmware 1.82 SourcePackage: linux UpgradeStatus: Upgraded to quantal on 2012-01-13 (173 days ago) dmi.bios.date: 03/25/10 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP71.88Z.0039.B05.1003251322 dmi.board.name: Mac-F222BEC8 dmi.board.vendor: Apple Inc. dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-F222BEC8 dmi.modalias: dmi:bvnAppleInc.:bvrMBP71.88Z.0039.B05.1003251322:bd03/25/10:svnAppleInc.:pnMacBookPro7,1:pvr1.0:rvnAppleInc.:rnMac-F222BEC8:rvr:cvnAppleInc.:ct10:cvrMac-F222BEC8: dmi.product.name: MacBookPro7,1 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. 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