[ INFO: soft-safe -> soft-unsafe lock order detected ] 2.6.19-1.2891.fc7 #1 ------------------------------------------------------ cupsd/1884 [HC0[0]:SC0[1]:HE1:SE0] is trying to acquire: (&ssec->nlbl_lock){--..}, at: [<c04cec37>] selinux_netlbl_socket_setsid+0xbb/0x123 and this task is already holding: (af_callback_keys + sk->sk_family#3){-.-+}, at: [<c05daa1c>] inet_accept+0x70/0xb5 which would create a new lock dependency: (af_callback_keys + sk->sk_family#3){-.-+} -> (&ssec->nlbl_lock){--..} but this new dependency connects a soft-irq-safe lock: (af_callback_keys + sk->sk_family#3){-.-+} ... which became soft-irq-safe at: [<c043fff1>] __lock_acquire+0x37d/0x9f8 [<c044094d>] lock_acquire+0x56/0x6f [<c05fbdb6>] _read_lock_bh+0x30/0x3d [<c04c687e>] selinux_socket_sock_rcv_skb+0xbd/0x252 [<c05d0645>] tcp_v4_rcv+0x37a/0x909 [<c05b7593>] ip_local_deliver+0x185/0x22e [<c05b73d6>] ip_rcv+0x418/0x450 [<c059ae9c>] netif_receive_skb+0x2db/0x35a [<c059c85f>] process_backlog+0x95/0xf6 [<c059ca46>] net_rx_action+0xa1/0x1a8 [<c042bf5a>] __do_softirq+0x6f/0xe2 [<c04063a1>] do_softirq+0x61/0xc7 [<ffffffff>] 0xffffffff to a soft-irq-unsafe lock: (&ssec->nlbl_lock){--..} ... which became soft-irq-unsafe at: ... [<c044007d>] __lock_acquire+0x409/0x9f8 [<c044094d>] lock_acquire+0x56/0x6f [<c05fbc89>] _spin_lock+0x2b/0x38 [<c04cec37>] selinux_netlbl_socket_setsid+0xbb/0x123 [<c04d0c92>] selinux_netlbl_socket_post_create+0x2d/0x2f [<c04c807b>] selinux_socket_post_create+0x156/0x15c [<c059213c>] __sock_create+0x179/0x1b2 [<c05921ae>] sock_create+0x1a/0x1f [<c0592435>] sys_socket+0x1b/0x3c [<c0592cba>] sys_socketcall+0x77/0x241 [<c0404050>] syscall_call+0x7/0xb [<ffffffff>] 0xffffffff other info that might help us debug this: 3 locks held by cupsd/1884: #0: (sk_lock-AF_INET){--..}, at: [<c05da9dd>] inet_accept+0x31/0xb5 #1: (af_callback_keys + sk->sk_family#3){-.-+}, at: [<c05daa1c>] inet_accept+0x70/0xb5 #2: (policy_rwlock){..-?}, at: [<c04cebd0>] selinux_netlbl_socket_setsid+0x54/0x123 the soft-irq-safe lock's dependencies: -> (af_callback_keys + sk->sk_family#3){-.-+} ops: 0 { initial-use at: [<c0440098>] __lock_acquire+0x424/0x9f8 [<c044094d>] lock_acquire+0x56/0x6f [<c05fbd3b>] _write_lock_bh+0x30/0x3d [<c05c1871>] tcp_close+0x24b/0x52b [<c05da570>] inet_release+0x43/0x49 [<c0591f72>] sock_release+0x17/0x68 [<c05921e0>] sock_close+0x2d/0x33 [<c047959b>] __fput+0xbe/0x168 [<c047965c>] fput+0x17/0x19 [<c0476f5d>] filp_close+0x54/0x5c [<c0477ee1>] sys_close+0x78/0xb0 [<c0404050>] syscall_call+0x7/0xb [<ffffffff>] 0xffffffff hardirq-on-W at: [<c0440056>] __lock_acquire+0x3e2/0x9f8 [<c044094d>] lock_acquire+0x56/0x6f [<c05fbd3b>] _write_lock_bh+0x30/0x3d [<c05c1871>] tcp_close+0x24b/0x52b [<c05da570>] inet_release+0x43/0x49 [<c0591f72>] sock_release+0x17/0x68 [<c05921e0>] sock_close+0x2d/0x33 [<c047959b>] __fput+0xbe/0x168 [<c047965c>] fput+0x17/0x19 [<c0476f5d>] filp_close+0x54/0x5c [<c0477ee1>] sys_close+0x78/0xb0 [<c0404050>] syscall_call+0x7/0xb [<ffffffff>] 0xffffffff in-softirq-R at: [<c043fff1>] __lock_acquire+0x37d/0x9f8 [<c044094d>] lock_acquire+0x56/0x6f [<c05fbdb6>] _read_lock_bh+0x30/0x3d [<c04c687e>] selinux_socket_sock_rcv_skb+0xbd/0x252 [<c05d0645>] tcp_v4_rcv+0x37a/0x909 [<c05b7593>] ip_local_deliver+0x185/0x22e [<c05b73d6>] ip_rcv+0x418/0x450 [<c059ae9c>] netif_receive_skb+0x2db/0x35a [<c059c85f>] process_backlog+0x95/0xf6 [<c059ca46>] net_rx_action+0xa1/0x1a8 [<c042bf5a>] __do_softirq+0x6f/0xe2 [<c04063a1>] do_softirq+0x61/0xc7 [<ffffffff>] 0xffffffff hardirq-on-R at: [<c044001f>] __lock_acquire+0x3ab/0x9f8 [<c044094d>] lock_acquire+0x56/0x6f [<c05fbdb6>] _read_lock_bh+0x30/0x3d [<c04c687e>] selinux_socket_sock_rcv_skb+0xbd/0x252 [<c05d0645>] tcp_v4_rcv+0x37a/0x909 [<c05b7593>] ip_local_deliver+0x185/0x22e [<c05b73d6>] ip_rcv+0x418/0x450 [<c059ae9c>] netif_receive_skb+0x2db/0x35a [<c059c85f>] process_backlog+0x95/0xf6 [<c059ca46>] net_rx_action+0xa1/0x1a8 [<c042bf5a>] __do_softirq+0x6f/0xe2 [<c04063a1>] do_softirq+0x61/0xc7 [<ffffffff>] 0xffffffff } ... key at: [<c09f6770>] af_callback_keys+0x10/0x100 the soft-irq-unsafe lock's dependencies: -> (&ssec->nlbl_lock){--..} ops: 0 { initial-use at: [<c0440098>] __lock_acquire+0x424/0x9f8 [<c044094d>] lock_acquire+0x56/0x6f [<c05fbc89>] _spin_lock+0x2b/0x38 [<c04cec37>] selinux_netlbl_socket_setsid+0xbb/0x123 [<c04d0c92>] selinux_netlbl_socket_post_create+0x2d/0x2f [<c04c807b>] selinux_socket_post_create+0x156/0x15c [<c059213c>] __sock_create+0x179/0x1b2 [<c05921ae>] sock_create+0x1a/0x1f [<c0592435>] sys_socket+0x1b/0x3c [<c0592cba>] sys_socketcall+0x77/0x241 [<c0404050>] syscall_call+0x7/0xb [<ffffffff>] 0xffffffff softirq-on-W at: [<c044007d>] __lock_acquire+0x409/0x9f8 [<c044094d>] lock_acquire+0x56/0x6f [<c05fbc89>] _spin_lock+0x2b/0x38 [<c04cec37>] selinux_netlbl_socket_setsid+0xbb/0x123 [<c04d0c92>] selinux_netlbl_socket_post_create+0x2d/0x2f [<c04c807b>] selinux_socket_post_create+0x156/0x15c [<c059213c>] __sock_create+0x179/0x1b2 [<c05921ae>] sock_create+0x1a/0x1f [<c0592435>] sys_socket+0x1b/0x3c [<c0592cba>] sys_socketcall+0x77/0x241 [<c0404050>] syscall_call+0x7/0xb [<ffffffff>] 0xffffffff hardirq-on-W at: [<c0440056>] __lock_acquire+0x3e2/0x9f8 [<c044094d>] lock_acquire+0x56/0x6f [<c05fbc89>] _spin_lock+0x2b/0x38 [<c04cec37>] selinux_netlbl_socket_setsid+0xbb/0x123 [<c04d0c92>] selinux_netlbl_socket_post_create+0x2d/0x2f [<c04c807b>] selinux_socket_post_create+0x156/0x15c [<c059213c>] __sock_create+0x179/0x1b2 [<c05921ae>] sock_create+0x1a/0x1f [<c0592435>] sys_socket+0x1b/0x3c [<c0592cba>] sys_socketcall+0x77/0x241 [<c0404050>] syscall_call+0x7/0xb [<ffffffff>] 0xffffffff } ... key at: [<c09ebb20>] __key.27522+0x0/0x8 stack backtrace: [<c04051c1>] show_trace_log_lvl+0x1a/0x2f [<c0405766>] show_trace+0x12/0x14 [<c04057ea>] dump_stack+0x16/0x18 [<c043fbe0>] check_usage+0x242/0x24c [<c04404f3>] __lock_acquire+0x87f/0x9f8 [<c044094d>] lock_acquire+0x56/0x6f [<c05fbc89>] _spin_lock+0x2b/0x38 [<c04cec37>] selinux_netlbl_socket_setsid+0xbb/0x123 [<c04d0f40>] selinux_netlbl_sock_graft+0xc7/0xcf [<c04c4b74>] selinux_sock_graft+0x32/0x36 [<c05daa3b>] inet_accept+0x8f/0xb5 [<c0592b93>] sys_accept+0xd0/0x180 [<c0592d13>] sys_socketcall+0xd0/0x241 [<c0404050>] syscall_call+0x7/0xb