netdev - Re: (3.1.0-rc2-git7) include/linux/inetdevice.h:209 invoked rcu_dereference

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Date:	Tue, 23 Aug 2011 07:02:46 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dave Jones <davej@...hat.com>
Cc:	netdev@...r.kernel.org
Subject: Re: (3.1.0-rc2-git7) include/linux/inetdevice.h:209 invoked
 rcu_dereference_check() without protection!

Le lundi 22 août 2011 à 22:44 -0400, Dave Jones a écrit :
> Just hit this..
> Is the fix as straight forward as changing that __in_dev_get_rcu to
> an in_dev_get() ?
> 
> 	Dave
> 
> 
>  ===================================================
>  [ INFO: suspicious rcu_dereference_check() usage. ]
>  ---------------------------------------------------
>  include/linux/inetdevice.h:209 invoked rcu_dereference_check() without protection!
>  
>  other info that might help us debug this:
>  
> 
>  rcu_scheduler_active = 1, debug_locks = 0
>  4 locks held by setfiles/2123:
>   #0:  (&sb->s_type->i_mutex_key#13){+.+.+.}, at: [<ffffffff8114cbc4>] walk_component+0x1ef/0x3e8
>   #1:  (&isec->lock){+.+.+.}, at: [<ffffffff81204bca>] inode_doinit_with_dentry+0x3f/0x41f
>   #2:  (&tbl->proxy_timer){+.-...}, at: [<ffffffff8106a803>] run_timer_softirq+0x157/0x372
>   #3:  (class){+.-...}, at: [<ffffffff8141f256>] neigh_proxy_process+0x36/0x103
>  
>  stack backtrace:
>  Pid: 2123, comm: setfiles Tainted: G        W   3.1.0-0.rc2.git7.2.fc16.x86_64 #1
>  Call Trace:
>   <IRQ>  [<ffffffff8108ca23>] lockdep_rcu_dereference+0xa7/0xaf
>   [<ffffffff8146a0b7>] __in_dev_get_rcu+0x55/0x5d
>   [<ffffffff8146a751>] arp_process+0x25/0x4d7
>   [<ffffffff8146ac11>] parp_redo+0xe/0x10
>   [<ffffffff8141f2ba>] neigh_proxy_process+0x9a/0x103
>   [<ffffffff8106a8c4>] run_timer_softirq+0x218/0x372
>   [<ffffffff8106a803>] ? run_timer_softirq+0x157/0x372
>   [<ffffffff8141f220>] ? neigh_stat_seq_open+0x41/0x41
>   [<ffffffff8108f2f0>] ? mark_held_locks+0x6d/0x95
>   [<ffffffff81062bb6>] __do_softirq+0x112/0x25a
>   [<ffffffff8150d27c>] call_softirq+0x1c/0x30
>   [<ffffffff81010bf5>] do_softirq+0x4b/0xa2
>   [<ffffffff81062f65>] irq_exit+0x5d/0xcf
>   [<ffffffff8150dc11>] smp_apic_timer_interrupt+0x7c/0x8a
>   [<ffffffff8150baf3>] apic_timer_interrupt+0x73/0x80
>   <EOI>  [<ffffffff8108f439>] ? trace_hardirqs_on_caller+0x121/0x158
>   [<ffffffff814fc285>] ? __slab_free+0x30/0x24c
>   [<ffffffff814fc283>] ? __slab_free+0x2e/0x24c
>   [<ffffffff81204e74>] ? inode_doinit_with_dentry+0x2e9/0x41f
>   [<ffffffff81204e74>] ? inode_doinit_with_dentry+0x2e9/0x41f
>   [<ffffffff81204e74>] ? inode_doinit_with_dentry+0x2e9/0x41f
>   [<ffffffff81130cb0>] kfree+0x108/0x131
>   [<ffffffff81204e74>] inode_doinit_with_dentry+0x2e9/0x41f
>   [<ffffffff81204fc6>] selinux_d_instantiate+0x1c/0x1e
>   [<ffffffff81200f4f>] security_d_instantiate+0x21/0x23
>   [<ffffffff81154625>] d_instantiate+0x5c/0x61
>   [<ffffffff811563ca>] d_splice_alias+0xbc/0xd2
>   [<ffffffff811b17ff>] ext4_lookup+0xba/0xeb
>   [<ffffffff8114bf1e>] d_alloc_and_lookup+0x45/0x6b
>   [<ffffffff8114cbea>] walk_component+0x215/0x3e8
>   [<ffffffff8114cdf8>] lookup_last+0x3b/0x3d
>   [<ffffffff8114daf3>] path_lookupat+0x82/0x2af
>   [<ffffffff8110fc53>] ? might_fault+0xa5/0xac
>   [<ffffffff8110fc0a>] ? might_fault+0x5c/0xac
>   [<ffffffff8114c564>] ? getname_flags+0x31/0x1ca
>   [<ffffffff8114dd48>] do_path_lookup+0x28/0x97
>   [<ffffffff8114df2c>] user_path_at+0x59/0x96
>   [<ffffffff811467ad>] ? cp_new_stat+0xf7/0x10d
>   [<ffffffff811469a6>] vfs_fstatat+0x44/0x6e
>   [<ffffffff811469ee>] vfs_lstat+0x1e/0x20
>   [<ffffffff81146b3d>] sys_newlstat+0x1a/0x33
>   [<ffffffff8108f439>] ? trace_hardirqs_on_caller+0x121/0x158
>   [<ffffffff812535fe>] ? trace_hardirqs_on_thunk+0x3a/0x3f
>   [<ffffffff8150af82>] system_call_fastpath+0x16/0x1b

Thanks for the report Dave, I am preparing a patch to fix this.



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