1. 08 10月, 2010 1 次提交
    • P
      net: suppress RCU lockdep false positive in sock_update_classid · 1144182a
      Paul E. McKenney 提交于
      > ===================================================
      > [ INFO: suspicious rcu_dereference_check() usage. ]
      > ---------------------------------------------------
      > include/linux/cgroup.h:542 invoked rcu_dereference_check() without protection!
      >
      > other info that might help us debug this:
      >
      >
      > rcu_scheduler_active = 1, debug_locks = 0
      > 1 lock held by swapper/1:
      >  #0:  (net_mutex){+.+.+.}, at: [<ffffffff813e9010>]
      > register_pernet_subsys+0x1f/0x47
      >
      > stack backtrace:
      > Pid: 1, comm: swapper Not tainted 2.6.35.4-28.fc14.x86_64 #1
      > Call Trace:
      >  [<ffffffff8107bd3a>] lockdep_rcu_dereference+0xaa/0xb3
      >  [<ffffffff813e04b9>] sock_update_classid+0x7c/0xa2
      >  [<ffffffff813e054a>] sk_alloc+0x6b/0x77
      >  [<ffffffff8140b281>] __netlink_create+0x37/0xab
      >  [<ffffffff813f941c>] ? rtnetlink_rcv+0x0/0x2d
      >  [<ffffffff8140cee1>] netlink_kernel_create+0x74/0x19d
      >  [<ffffffff8149c3ca>] ? __mutex_lock_common+0x339/0x35b
      >  [<ffffffff813f7e9c>] rtnetlink_net_init+0x2e/0x48
      >  [<ffffffff813e8d7a>] ops_init+0xe9/0xff
      >  [<ffffffff813e8f0d>] register_pernet_operations+0xab/0x130
      >  [<ffffffff813e901f>] register_pernet_subsys+0x2e/0x47
      >  [<ffffffff81db7bca>] rtnetlink_init+0x53/0x102
      >  [<ffffffff81db835c>] netlink_proto_init+0x126/0x143
      >  [<ffffffff81db8236>] ? netlink_proto_init+0x0/0x143
      >  [<ffffffff810021b8>] do_one_initcall+0x72/0x186
      >  [<ffffffff81d78ebc>] kernel_init+0x23b/0x2c9
      >  [<ffffffff8100aae4>] kernel_thread_helper+0x4/0x10
      >  [<ffffffff8149e2d0>] ? restore_args+0x0/0x30
      >  [<ffffffff81d78c81>] ? kernel_init+0x0/0x2c9
      >  [<ffffffff8100aae0>] ? kernel_thread_helper+0x0/0x10
      
      The sock_update_classid() function calls task_cls_classid(current),
      but the calling task cannot go away, so there is no danger of
      the associated structures disappearing.  Insert an RCU read-side
      critical section to suppress the false positive.
      Reported-by: NSubrata Modak <subrata@linux.vnet.ibm.com>
      Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      1144182a
  2. 07 10月, 2010 7 次提交
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  4. 05 10月, 2010 26 次提交