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    Subject2.6.31-rc3: lockdep warning triggered by dup_fd

    The backtrace below has been observed once with a kernel compiled from
    an unmodified infiniband git tree
    ( Has
    anyone observed similar behavior before ? Is this a known issue that
    has already been fixed in a more recent release candidate of the
    2.6.31 kernel ?


    ------------[ cut here ]------------
    WARNING: at kernel/lockdep.c:732 register_lock_class+0x149/0x450()
    Hardware name: P5Q DELUXE
    Modules linked in: af_packet cpufreq_conservative cpufreq_userspace
    cpufreq_powersave acpi_cpufreq fuse md_mod dm_mod coretemp hwmon
    8250_pnp 8250 pcspkr serial_core button mlx4_core sky2 sr_mod sg
    sd_mod uhci_hcd ehci_hcd usbcore ext3 mbcache jbd fan ide_pci_generic
    ide_core ata_generic ata_piix thermal processor pata_jmicron ahci
    Pid: 2595, comm: ifup Tainted: G        W  2.6.31-rc3-default #1
    Call Trace:
     [<ffffffff8106f939>] ? register_lock_class+0x149/0x450
     [<ffffffff81046cb8>] warn_slowpath_common+0x78/0xd0
     [<ffffffff81046d1f>] warn_slowpath_null+0xf/0x20
     [<ffffffff8106f939>] register_lock_class+0x149/0x450
     [<ffffffff81072c2a>] __lock_acquire+0x49a/0x1230
     [<ffffffff81071ea4>] ? debug_check_no_locks_freed+0x94/0x160
     [<ffffffff81071dad>] ? trace_hardirqs_on_caller+0x14d/0x1a0
     [<ffffffff81073a16>] lock_acquire+0x56/0x80
     [<ffffffff810ddc2d>] ? dup_fd+0xbd/0x380
     [<ffffffff81314ef1>] _spin_lock+0x31/0x70
     [<ffffffff810ddc2d>] ? dup_fd+0xbd/0x380
     [<ffffffff810ddc2d>] dup_fd+0xbd/0x380
     [<ffffffff8103a41c>] ? set_task_cpu+0x5c/0x210
     [<ffffffff81045746>] copy_process+0x956/0x13d0
     [<ffffffff81046247>] do_fork+0x87/0x3f0
     [<ffffffff810713b5>] ? lock_release_holdtime+0x35/0x1b0
     [<ffffffff81071dad>] ? trace_hardirqs_on_caller+0x14d/0x1a0
     [<ffffffff81071e0d>] ? trace_hardirqs_on+0xd/0x10
     [<ffffffff81314cab>] ? _spin_unlock_irq+0x2b/0x40
     [<ffffffff8100b4dc>] ? sysret_check+0x27/0x62
     [<ffffffff81009c03>] sys_clone+0x23/0x30
     [<ffffffff8100b813>] stub_clone+0x13/0x20
     [<ffffffff8100b4ab>] ? system_call_fastpath+0x16/0x1b
    ---[ end trace 7491f358a793e951 ]---
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      Last update: 2009-08-23 09:39    [W:0.029 / U:4.512 seconds]
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