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    SubjectRe: Linus Git (3.11.0+) - security/apparmor/include/policy.h:363 suspicious rcu_dereference_check() usage!
    On Wed, Sep 11, 2013 at 11:39:31PM -0400, Miles Lane wrote:
    > [ 29.804534] [ INFO: suspicious RCU usage. ]
    > [ 29.804539] 3.11.0+ #5 Not tainted
    > [ 29.804541] -------------------------------
    > [ 29.804545] security/apparmor/include/policy.h:363 suspicious
    > rcu_dereference_check() usage!

    Adding the AppArmor maintainer and list on CC, looks like one for them.

    Thanx, Paul

    > [ 29.804548]
    > [ 29.804548] other info that might help us debug this:
    > [ 29.804548]
    > [ 29.804553]
    > [ 29.804553] rcu_scheduler_active = 1, debug_locks = 1
    > [ 29.804558] 2 locks held by apparmor_parser/1268:
    > [ 29.804560] #0: (sb_writers#9){.+.+.+}, at: [<ffffffff81120a4c>]
    > file_start_write+0x27/0x29
    > [ 29.804576] #1: (&ns->lock){+.+.+.}, at: [<ffffffff811f5d88>]
    > aa_replace_profiles+0x166/0x57c
    > [ 29.804589]
    > [ 29.804589] stack backtrace:
    > [ 29.804595] CPU: 0 PID: 1268 Comm: apparmor_parser Not tainted 3.11.0+ #5
    > [ 29.804599] Hardware name: ASUSTeK Computer Inc. UL50VT
    > /UL50VT , BIOS 217 03/01/2010
    > [ 29.804602] 0000000000000000 ffff8800b95a1d90 ffffffff8144eb9b
    > ffff8800b94db540
    > [ 29.804611] ffff8800b95a1dc0 ffffffff81087439 ffff880138cc3a18
    > ffff880138cc3a18
    > [ 29.804619] ffff8800b9464a90 ffff880138cc3a38 ffff8800b95a1df0
    > ffffffff811f5084
    > [ 29.804628] Call Trace:
    > [ 29.804636] [<ffffffff8144eb9b>] dump_stack+0x4e/0x82
    > [ 29.804642] [<ffffffff81087439>] lockdep_rcu_suspicious+0xfc/0x105
    > [ 29.804649] [<ffffffff811f5084>] __aa_update_replacedby+0x53/0x7f
    > [ 29.804655] [<ffffffff811f5408>] __replace_profile+0x11f/0x1ed
    > [ 29.804661] [<ffffffff811f6032>] aa_replace_profiles+0x410/0x57c
    > [ 29.804668] [<ffffffff811f16d4>] profile_replace+0x35/0x4c
    > [ 29.804674] [<ffffffff81120fa3>] vfs_write+0xad/0x113
    > [ 29.804680] [<ffffffff81121609>] SyS_write+0x44/0x7a
    > [ 29.804687] [<ffffffff8145bfd2>] system_call_fastpath+0x16/0x1b
    > [ 29.804691]
    > [ 29.804694] ===============================
    > [ 29.804697] [ INFO: suspicious RCU usage. ]
    > [ 29.804700] 3.11.0+ #5 Not tainted
    > [ 29.804703] -------------------------------
    > [ 29.804706] security/apparmor/policy.c:566 suspicious
    > rcu_dereference_check() usage!
    > [ 29.804709]
    > [ 29.804709] other info that might help us debug this:
    > [ 29.804709]
    > [ 29.804714]
    > [ 29.804714] rcu_scheduler_active = 1, debug_locks = 1
    > [ 29.804718] 2 locks held by apparmor_parser/1268:
    > [ 29.804721] #0: (sb_writers#9){.+.+.+}, at: [<ffffffff81120a4c>]
    > file_start_write+0x27/0x29
    > [ 29.804733] #1: (&ns->lock){+.+.+.}, at: [<ffffffff811f5d88>]
    > aa_replace_profiles+0x166/0x57c
    > [ 29.804744]
    > [ 29.804744] stack backtrace:
    > [ 29.804750] CPU: 0 PID: 1268 Comm: apparmor_parser Not tainted 3.11.0+ #5
    > [ 29.804753] Hardware name: ASUSTeK Computer Inc. UL50VT
    > /UL50VT , BIOS 217 03/01/2010
    > [ 29.804756] 0000000000000000 ffff8800b95a1d80 ffffffff8144eb9b
    > ffff8800b94db540
    > [ 29.804764] ffff8800b95a1db0 ffffffff81087439 ffff8800b95b02b0
    > 0000000000000000
    > [ 29.804772] ffff8800b9efba08 ffff880138cc3a38 ffff8800b95a1dd0
    > ffffffff811f4f94
    > [ 29.804779] Call Trace:
    > [ 29.804786] [<ffffffff8144eb9b>] dump_stack+0x4e/0x82
    > [ 29.804791] [<ffffffff81087439>] lockdep_rcu_suspicious+0xfc/0x105
    > [ 29.804798] [<ffffffff811f4f94>] aa_free_replacedby_kref+0x4d/0x62
    > [ 29.804804] [<ffffffff811f4f47>] ? aa_put_namespace+0x17/0x17
    > [ 29.804810] [<ffffffff811f4f0b>] kref_put+0x36/0x40
    > [ 29.804816] [<ffffffff811f5423>] __replace_profile+0x13a/0x1ed
    > [ 29.804822] [<ffffffff811f6032>] aa_replace_profiles+0x410/0x57c
    > [ 29.804829] [<ffffffff811f16d4>] profile_replace+0x35/0x4c
    > [ 29.804835] [<ffffffff81120fa3>] vfs_write+0xad/0x113
    > [ 29.804840] [<ffffffff81121609>] SyS_write+0x44/0x7a
    > [ 29.804847] [<ffffffff8145bfd2>] system_call_fastpath+0x16/0x1b
    > --
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