Date:	Mon, 06 Dec 2010 13:22:00 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	jean-philippe.menil@...v-nantes.fr
Cc:	netdev@...r.kernel.org,
	Michael Leun <lkml20100708@...ton.leun.net>,
	David Lamparter <equinox@...c24.net>, Greg KH <greg@...ah.com>,
	davem@...emloft.net, linux-kernel@...r.kernel.org,
	Alexey Dobriyan <adobriyan@...il.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: NET_NS: unregister_netdevice: waiting for lo to become free (adding ipv6 address to interface)

Menil Jean-Philippe <jean-philippe.menil@...v-nantes.fr> writes:

> Le 24/10/2010 15:15, Michael Leun a écrit :
>> On Fri, 22 Oct 2010 19:05:32 +0200
>> Michael Leun<lkml20100708@...ton.leun.net>  wrote:
>>
>>> On Fri, 22 Oct 2010 14:48:58 +0200
>>> David Lamparter<equinox@...c24.net>  wrote:
>>>
>>>> On Thu, Oct 21, 2010 at 05:15:32PM +0200, Michael Leun wrote:
>>>>> unfortunately the bug described below originally reported in
>>>>> 2.6.35-rcX is still there in 2.6.36.
>>>>
>>>> can you post your full kernel .config?
>>>
>>> Please find below.
>>>
>>>> I'm using network namespaces quite extensively - OpenVPN and IPv6
>>>> included - and i haven't hit this bug. That makes it rather likely
>>>> it depends on some option difference.
>>>
>>> I take candidates for options to change for test... ;-)
>>>
>>> Maybe I will try to strip it down for test towards a minimal config.
>>
>> Now I have tried a kernel config with almost everything disabled -
>> please find below.
>>
>> If I have overlooked anything I should disable (or if you suggest I
>> should not disable, but enable any option) - please tell me.
>>
>> I've created an ~2.5MB bootable ISO image based on buildroot/busybox
>> with this kernel, which also shows this bug (e.g. when run in
>> VirtualBox).
>>
>> If anybody is interested I could send this image as mail attachment or
>> provide a download link.
>>
>> ml@...ia:~>  grep -v "^#" .config |grep -v "^ *$"
>> CONFIG_X86_32=y
>> CONFIG_X86=y
>> CONFIG_INSTRUCTION_DECODER=y
>> CONFIG_OUTPUT_FORMAT="elf32-i386"
>> CONFIG_ARCH_DEFCONFIG="arch/x86/configs/i386_defconfig"
>> CONFIG_GENERIC_CMOS_UPDATE=y
>> CONFIG_CLOCKSOURCE_WATCHDOG=y
>> CONFIG_GENERIC_CLOCKEVENTS=y
>> CONFIG_LOCKDEP_SUPPORT=y
>> CONFIG_STACKTRACE_SUPPORT=y
>> CONFIG_HAVE_LATENCYTOP_SUPPORT=y
>> CONFIG_MMU=y
>> CONFIG_ZONE_DMA=y
>> CONFIG_NEED_SG_DMA_LENGTH=y
>> CONFIG_GENERIC_ISA_DMA=y
>> CONFIG_GENERIC_IOMAP=y
>> CONFIG_GENERIC_BUG=y
>> CONFIG_GENERIC_HWEIGHT=y
>> CONFIG_ARCH_MAY_HAVE_PC_FDC=y
>> CONFIG_RWSEM_XCHGADD_ALGORITHM=y
>> CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y
>> CONFIG_GENERIC_CALIBRATE_DELAY=y
>> CONFIG_ARCH_HAS_CPU_RELAX=y
>> CONFIG_ARCH_HAS_DEFAULT_IDLE=y
>> CONFIG_ARCH_HAS_CACHE_LINE_SIZE=y
>> CONFIG_HAVE_SETUP_PER_CPU_AREA=y
>> CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK=y
>> CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
>> CONFIG_ARCH_HIBERNATION_POSSIBLE=y
>> CONFIG_ARCH_SUSPEND_POSSIBLE=y
>> CONFIG_ARCH_POPULATES_NODE_MAP=y
>> CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING=y
>> CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
>> CONFIG_HAVE_EARLY_RES=y
>> CONFIG_GENERIC_HARDIRQS=y
>> CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ=y
>> CONFIG_GENERIC_IRQ_PROBE=y
>> CONFIG_X86_32_LAZY_GS=y
>> CONFIG_ARCH_HWEIGHT_CFLAGS="-fcall-saved-ecx -fcall-saved-edx"
>> CONFIG_KTIME_SCALAR=y
>> CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
>> CONFIG_CONSTRUCTORS=y
>> CONFIG_EXPERIMENTAL=y
>> CONFIG_BROKEN_ON_SMP=y
>> CONFIG_INIT_ENV_ARG_LIMIT=32
>> CONFIG_CROSS_COMPILE=""
>> CONFIG_LOCALVERSION=""
>> CONFIG_HAVE_KERNEL_GZIP=y
>> CONFIG_HAVE_KERNEL_BZIP2=y
>> CONFIG_HAVE_KERNEL_LZMA=y
>> CONFIG_HAVE_KERNEL_LZO=y
>> CONFIG_KERNEL_LZMA=y
>> CONFIG_TREE_RCU=y
>> CONFIG_RCU_FANOUT=32
>> CONFIG_IKCONFIG=y
>> CONFIG_IKCONFIG_PROC=y
>> CONFIG_LOG_BUF_SHIFT=18
>> CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y
>> CONFIG_NAMESPACES=y
>> CONFIG_NET_NS=y
>> CONFIG_BLK_DEV_INITRD=y
>> CONFIG_INITRAMFS_SOURCE=""
>> CONFIG_RD_GZIP=y
>> CONFIG_RD_BZIP2=y
>> CONFIG_RD_LZMA=y
>> CONFIG_RD_LZO=y
>> CONFIG_SYSCTL=y
>> CONFIG_ANON_INODES=y
>> CONFIG_UID16=y
>> CONFIG_SYSCTL_SYSCALL=y
>> CONFIG_KALLSYMS=y
>> CONFIG_HOTPLUG=y
>> CONFIG_PRINTK=y
>> CONFIG_BUG=y
>> CONFIG_ELF_CORE=y
>> CONFIG_PCSPKR_PLATFORM=y
>> CONFIG_BASE_FULL=y
>> CONFIG_FUTEX=y
>> CONFIG_EPOLL=y
>> CONFIG_SIGNALFD=y
>> CONFIG_TIMERFD=y
>> CONFIG_EVENTFD=y
>> CONFIG_SHMEM=y
>> CONFIG_AIO=y
>> CONFIG_HAVE_PERF_EVENTS=y
>> CONFIG_PERF_EVENTS=y
>> CONFIG_VM_EVENT_COUNTERS=y
>> CONFIG_PCI_QUIRKS=y
>> CONFIG_SLUB_DEBUG=y
>> CONFIG_SLUB=y
>> CONFIG_HAVE_OPROFILE=y
>> CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
>> CONFIG_HAVE_IOREMAP_PROT=y
>> CONFIG_HAVE_KPROBES=y
>> CONFIG_HAVE_KRETPROBES=y
>> CONFIG_HAVE_OPTPROBES=y
>> CONFIG_HAVE_ARCH_TRACEHOOK=y
>> CONFIG_HAVE_DMA_ATTRS=y
>> CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
>> CONFIG_HAVE_DMA_API_DEBUG=y
>> CONFIG_HAVE_HW_BREAKPOINT=y
>> CONFIG_HAVE_MIXED_BREAKPOINTS_REGS=y
>> CONFIG_HAVE_USER_RETURN_NOTIFIER=y
>> CONFIG_HAVE_PERF_EVENTS_NMI=y
>> CONFIG_HAVE_GENERIC_DMA_COHERENT=y
>> CONFIG_SLABINFO=y
>> CONFIG_RT_MUTEXES=y
>> CONFIG_BASE_SMALL=0
>> CONFIG_BLOCK=y
>> CONFIG_LBDAF=y
>> CONFIG_IOSCHED_NOOP=y
>> CONFIG_DEFAULT_NOOP=y
>> CONFIG_DEFAULT_IOSCHED="noop"
>> CONFIG_INLINE_SPIN_UNLOCK=y
>> CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
>> CONFIG_INLINE_READ_UNLOCK=y
>> CONFIG_INLINE_READ_UNLOCK_IRQ=y
>> CONFIG_INLINE_WRITE_UNLOCK=y
>> CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
>> CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
>> CONFIG_M586=y
>> CONFIG_X86_CPU=y
>> CONFIG_X86_INTERNODE_CACHE_SHIFT=5
>> CONFIG_X86_CMPXCHG=y
>> CONFIG_X86_L1_CACHE_SHIFT=5
>> CONFIG_X86_XADD=y
>> CONFIG_X86_F00F_BUG=y
>> CONFIG_X86_WP_WORKS_OK=y
>> CONFIG_X86_INVLPG=y
>> CONFIG_X86_BSWAP=y
>> CONFIG_X86_POPAD_OK=y
>> CONFIG_X86_ALIGNMENT_16=y
>> CONFIG_X86_MINIMUM_CPU_FAMILY=4
>> CONFIG_CPU_SUP_INTEL=y
>> CONFIG_CPU_SUP_CYRIX_32=y
>> CONFIG_CPU_SUP_AMD=y
>> CONFIG_CPU_SUP_CENTAUR=y
>> CONFIG_CPU_SUP_TRANSMETA_32=y
>> CONFIG_CPU_SUP_UMC_32=y
>> CONFIG_DMI=y
>> CONFIG_NR_CPUS=1
>> CONFIG_PREEMPT_NONE=y
>> CONFIG_VM86=y
>> CONFIG_HIGHMEM4G=y
>> CONFIG_PAGE_OFFSET=0xC0000000
>> CONFIG_HIGHMEM=y
>> CONFIG_NEED_NODE_MEMMAP_SIZE=y
>> CONFIG_ARCH_FLATMEM_ENABLE=y
>> CONFIG_ARCH_SPARSEMEM_ENABLE=y
>> CONFIG_ARCH_SELECT_MEMORY_MODEL=y
>> CONFIG_ILLEGAL_POINTER_VALUE=0
>> CONFIG_SELECT_MEMORY_MODEL=y
>> CONFIG_SPARSEMEM_MANUAL=y
>> CONFIG_SPARSEMEM=y
>> CONFIG_HAVE_MEMORY_PRESENT=y
>> CONFIG_SPARSEMEM_STATIC=y
>> CONFIG_SPLIT_PTLOCK_CPUS=4
>> CONFIG_ZONE_DMA_FLAG=1
>> CONFIG_BOUNCE=y
>> CONFIG_VIRT_TO_BUS=y
>> CONFIG_DEFAULT_MMAP_MIN_ADDR=65536
>> CONFIG_MTRR=y
>> CONFIG_X86_PAT=y
>> CONFIG_ARCH_USES_PG_UNCACHED=y
>> CONFIG_HZ_1000=y
>> CONFIG_HZ=1000
>> CONFIG_PHYSICAL_START=0x1000000
>> CONFIG_PHYSICAL_ALIGN=0x1000000
>> CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
>> CONFIG_PCI=y
>> CONFIG_PCI_GOANY=y
>> CONFIG_PCI_BIOS=y
>> CONFIG_PCI_DIRECT=y
>> CONFIG_PCI_DOMAINS=y
>> CONFIG_ISA_DMA_API=y
>> CONFIG_K8_NB=y
>> CONFIG_BINFMT_ELF=y
>> CONFIG_HAVE_AOUT=y
>> CONFIG_HAVE_ATOMIC_IOMAP=y
>> CONFIG_NET=y
>> CONFIG_UNIX=y
>> CONFIG_INET=y
>> CONFIG_IP_FIB_HASH=y
>> CONFIG_TCP_CONG_CUBIC=y
>> CONFIG_DEFAULT_TCP_CONG="cubic"
>> CONFIG_IPV6=y
>> CONFIG_UEVENT_HELPER_PATH=""
>> CONFIG_DEVTMPFS=y
>> CONFIG_DEVTMPFS_MOUNT=y
>> CONFIG_PREVENT_FIRMWARE_BUILD=y
>> CONFIG_FW_LOADER=y
>> CONFIG_EXTRA_FIRMWARE=""
>> CONFIG_HAVE_IDE=y
>> CONFIG_SCSI_MOD=y
>> CONFIG_NETDEVICES=y
>> CONFIG_VETH=y
>> CONFIG_INPUT=y
>> CONFIG_INPUT_MOUSEDEV=y
>> CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
>> CONFIG_INPUT_MOUSEDEV_SCREEN_Y=576
>> CONFIG_INPUT_KEYBOARD=y
>> CONFIG_KEYBOARD_ATKBD=y
>> CONFIG_SERIO=y
>> CONFIG_SERIO_I8042=y
>> CONFIG_SERIO_LIBPS2=y
>> CONFIG_VT=y
>> CONFIG_CONSOLE_TRANSLATIONS=y
>> CONFIG_VT_CONSOLE=y
>> CONFIG_HW_CONSOLE=y
>> CONFIG_FIX_EARLYCON_MEM=y
>> CONFIG_UNIX98_PTYS=y
>> CONFIG_DEVPORT=y
>> CONFIG_ARCH_WANT_OPTIONAL_GPIOLIB=y
>> CONFIG_SSB_POSSIBLE=y
>> CONFIG_VGA_ARB=y
>> CONFIG_VGA_ARB_MAX_GPUS=16
>> CONFIG_VGA_CONSOLE=y
>> CONFIG_VGACON_SOFT_SCROLLBACK=y
>> CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=64
>> CONFIG_DUMMY_CONSOLE=y
>> CONFIG_FIRMWARE_MEMMAP=y
>> CONFIG_FILE_LOCKING=y
>> CONFIG_PROC_FS=y
>> CONFIG_PROC_SYSCTL=y
>> CONFIG_PROC_PAGE_MONITOR=y
>> CONFIG_SYSFS=y
>> CONFIG_MSDOS_PARTITION=y
>> CONFIG_TRACE_IRQFLAGS_SUPPORT=y
>> CONFIG_FRAME_WARN=2048
>> CONFIG_DEBUG_BUGVERBOSE=y
>> CONFIG_DEBUG_MEMORY_INIT=y
>> CONFIG_ARCH_WANT_FRAME_POINTERS=y
>> CONFIG_USER_STACKTRACE_SUPPORT=y
>> CONFIG_HAVE_FUNCTION_TRACER=y
>> CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
>> CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST=y
>> CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST=y
>> CONFIG_HAVE_DYNAMIC_FTRACE=y
>> CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
>> CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
>> CONFIG_TRACING_SUPPORT=y
>> CONFIG_HAVE_ARCH_KGDB=y
>> CONFIG_HAVE_ARCH_KMEMCHECK=y
>> CONFIG_EARLY_PRINTK=y
>> CONFIG_DOUBLEFAULT=y
>> CONFIG_HAVE_MMIOTRACE_SUPPORT=y
>> CONFIG_IO_DELAY_TYPE_0X80=0
>> CONFIG_IO_DELAY_TYPE_0XED=1
>> CONFIG_IO_DELAY_TYPE_UDELAY=2
>> CONFIG_IO_DELAY_TYPE_NONE=3
>> CONFIG_IO_DELAY_0X80=y
>> CONFIG_DEFAULT_IO_DELAY_TYPE=0
>> CONFIG_DEFAULT_SECURITY_DAC=y
>> CONFIG_DEFAULT_SECURITY=""
>> CONFIG_HAVE_KVM=y
>> CONFIG_GENERIC_FIND_FIRST_BIT=y
>> CONFIG_GENERIC_FIND_NEXT_BIT=y
>> CONFIG_GENERIC_FIND_LAST_BIT=y
>> CONFIG_ZLIB_INFLATE=y
>> CONFIG_LZO_DECOMPRESS=y
>> CONFIG_DECOMPRESS_GZIP=y
>> CONFIG_DECOMPRESS_BZIP2=y
>> CONFIG_DECOMPRESS_LZMA=y
>> CONFIG_DECOMPRESS_LZO=y
>> CONFIG_HAS_IOMEM=y
>> CONFIG_HAS_IOPORT=y
>> CONFIG_HAS_DMA=y
>> CONFIG_NLATTR=y
>>
>
> Hi,
>
> curiously, i'm facing a similar problem in 2.6.36.1
>
> in my container, when i configure ipv6 adress on the interfaces, everything
> seems good on the first boot of the host. If i shutdown my container (lxc), then
> boot it, i observe the following logs:
> Dec  6 17:04:12 suntory.u06.univ-nantes.prive kernel: [  368.192019]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:04:22 suntory.u06.univ-nantes.prive kernel: [  378.432018]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:04:32 suntory.u06.univ-nantes.prive kernel: [  388.672015]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:04:42 suntory.u06.univ-nantes.prive kernel: [  398.912016]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:04:53 suntory.u06.univ-nantes.prive kernel: [  409.152016]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:05:03 suntory.u06.univ-nantes.prive kernel: [  419.392018]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:05:13 suntory.u06.univ-nantes.prive kernel: [  429.632018]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:05:23 suntory.u06.univ-nantes.prive kernel: [  439.876016]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:05:34 suntory.u06.univ-nantes.prive kernel: [  450.116015]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:05:44 suntory.u06.univ-nantes.prive kernel: [  460.356019]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:05:54 suntory.u06.univ-nantes.prive kernel: [  470.596020]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:06:04 suntory.u06.univ-nantes.prive kernel: [  480.836019]
> unregister_netdevice: waiting for lo to become free. Usage count = 4
> Dec  6 17:06:05 suntory.u06.univ-nantes.prive kernel: [  481.468021] INFO: task
> lxc-start:3805 blocked for more than 120 seconds.
>
> Then i must reboot the host.
> The same on kernel 2.6.34, but everything is good on a 2.6.32
>
> Some relvant informations about the kernel:
> root@...tory:~# cat /boot/config-2.6.36.1-dsiun-1d | grep -i sysfs
> # CONFIG_SYSFS_DEPRECATED_V2 is not set
> CONFIG_ACPI_SYSFS_POWER=y
> # CONFIG_WIRELESS_EXT_SYSFS is not set
> CONFIG_ISCSI_BOOT_SYSFS=m
> CONFIG_RTC_INTF_SYSFS=y
> CONFIG_SYSFS=y
> root@...tory:~# cat /boot/config-2.6.36.1-dsiun-1d | grep -i net_ns
> CONFIG_NET_NS=y
>
> Is there anything in my configuration, i must check in order to get ipv6 working
> fully in the container?

2.6.37-rc4 is working here.  There were problems earlier in the earlier
rcs. Can you try that?

There have been a couple of different reference counting bugs between
2.6.34 and the present, and I haven't tracked them, just noticed they
exist.

Eric
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