inconsistent lock/deadlock crash, vanilla 3.3.4, 32bit, tcp

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I apologize for late night post, and a lot of trash left in report.
I will cleanup it up now, and send with CC to maintainers.

Server job are proxy, with very high rate of new connections.
Deadlock at peaktime can be easily reproduced in 10-15 minutes.

Deadlock occured on almost all 3.3-stable versions (tried 3.3.3 - 3.3.4). It is not easy to try older kernel,
but if required i can try.
Usually also, because SYN rate very high, i can see:
[ 51.612987] TCP: Possible SYN flooding on port 8080. Sending cookies. Check SNMP counters.

 [  762.903868]
 [  762.903880] =================================
 [  762.903890] [ INFO: inconsistent lock state ]
 [  762.903903] 3.3.4-build-0061 #8 Not tainted
 [  762.904133] ---------------------------------
 [  762.904344] inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
 [  762.904542] squid/1603 [HC0[0]:SC0[0]:HE1:SE1] takes:
[ 762.904542] (key#3){+.?...}, at: [<c0232cc4>] __percpu_counter_sum+0xd/0x58
 [  762.904542] {IN-SOFTIRQ-W} state was registered at:
 [  762.904542]   [<c0158b84>] __lock_acquire+0x284/0xc26
 [  762.904542]   [<c01598e8>] lock_acquire+0x71/0x85
 [  762.904542]   [<c0349765>] _raw_spin_lock+0x33/0x40
 [  762.904542]   [<c0232c93>] __percpu_counter_add+0x58/0x7c
 [  762.904542]   [<c02cfde1>] sk_clone_lock+0x1e5/0x200
 [  762.904542]   [<c0303ee4>] inet_csk_clone_lock+0xe/0x78
 [  762.904542]   [<c0315778>] tcp_create_openreq_child+0x1b/0x404
 [  762.904542]   [<c031339c>] tcp_v4_syn_recv_sock+0x32/0x1c1
 [  762.904542]   [<c031615a>] tcp_check_req+0x1fd/0x2d7
 [  762.904542]   [<c0313f77>] tcp_v4_do_rcv+0xab/0x194
 [  762.904542]   [<c03153bb>] tcp_v4_rcv+0x3b3/0x5cc
 [  762.904542]   [<c02fc0c4>] ip_local_deliver_finish+0x13a/0x1e9
 [  762.904542]   [<c02fc539>] NF_HOOK.clone.11+0x46/0x4d
 [  762.904542]   [<c02fc652>] ip_local_deliver+0x41/0x45
 [  762.904542]   [<c02fc4d1>] ip_rcv_finish+0x31a/0x33c
 [  762.904542]   [<c02fc539>] NF_HOOK.clone.11+0x46/0x4d
 [  762.904542]   [<c02fc857>] ip_rcv+0x201/0x23e
 [  762.904542]   [<c02daa3a>] __netif_receive_skb+0x319/0x368
 [  762.904542]   [<c02dac07>] netif_receive_skb+0x4e/0x7d
 [  762.904542]   [<c02dacf6>] napi_skb_finish+0x1e/0x34
 [  762.904542]   [<c02db122>] napi_gro_receive+0x20/0x24
 [  762.904542]   [<f85d1743>] e1000_receive_skb+0x3f/0x45 [e1000e]
 [  762.904542]   [<f85d3464>] e1000_clean_rx_irq+0x1f9/0x284 [e1000e]
 [  762.904542]   [<f85d3926>] e1000_clean+0x62/0x1f4 [e1000e]
 [  762.904542]   [<c02db228>] net_rx_action+0x90/0x160
 [  762.904542]   [<c012a445>] __do_softirq+0x7b/0x118
 [  762.904542] irq event stamp: 156915469
[ 762.904542] hardirqs last enabled at (156915469): [<c019b4f4>] __slab_alloc.clone.58.clone.63+0xc4/0x2de [ 762.904542] hardirqs last disabled at (156915468): [<c019b452>] __slab_alloc.clone.58.clone.63+0x22/0x2de [ 762.904542] softirqs last enabled at (156915466): [<c02ce677>] lock_sock_nested+0x64/0x6c [ 762.904542] softirqs last disabled at (156915464): [<c0349914>] _raw_spin_lock_bh+0xe/0x45
 [  762.904542]
 [  762.904542] other info that might help us debug this:
 [  762.904542]  Possible unsafe locking scenario:
 [  762.904542]
 [  762.904542]        CPU0
 [  762.904542]        ----
 [  762.904542]   lock(key#3);
 [  762.904542]   <Interrupt>
 [  762.904542]     lock(key#3);
 [  762.904542]
 [  762.904542]  *** DEADLOCK ***
 [  762.904542]
 [  762.904542] 1 lock held by squid/1603:
[ 762.904542] #0: (sk_lock-AF_INET){+.+.+.}, at: [<c03055c0>] lock_sock+0xa/0xc
 [  762.904542]
 [  762.904542] stack backtrace:
 [  762.904542] Pid: 1603, comm: squid Not tainted 3.3.4-build-0061 #8
 [  762.904542] Call Trace:
 [  762.904542]  [<c0347b73>] ? printk+0x18/0x1d
 [  762.904542]  [<c015873a>] valid_state+0x1f6/0x201
 [  762.904542]  [<c0158816>] mark_lock+0xd1/0x1bb
 [  762.904542]  [<c015876b>] ? mark_lock+0x26/0x1bb
 [  762.904542]  [<c015805d>] ? check_usage_forwards+0x77/0x77
 [  762.904542]  [<c0158bf8>] __lock_acquire+0x2f8/0xc26
 [  762.904542]  [<c0159b8e>] ? mark_held_locks+0x5d/0x7b
 [  762.904542]  [<c0159cf6>] ? trace_hardirqs_on+0xb/0xd
 [  762.904542]  [<c0158dd4>] ? __lock_acquire+0x4d4/0xc26
 [  762.904542]  [<c01598e8>] lock_acquire+0x71/0x85
 [  762.904542]  [<c0232cc4>] ? __percpu_counter_sum+0xd/0x58
 [  762.904542]  [<c0349765>] _raw_spin_lock+0x33/0x40
 [  762.904542]  [<c0232cc4>] ? __percpu_counter_sum+0xd/0x58
 [  762.904542]  [<c0232cc4>] __percpu_counter_sum+0xd/0x58
 [  762.904542]  [<c02cebc4>] __sk_mem_schedule+0xdd/0x1c7
 [  762.904542]  [<c02d178d>] ? __alloc_skb+0x76/0x100
 [  762.904542]  [<c0305e8e>] sk_wmem_schedule+0x21/0x2d
 [  762.904542]  [<c0306370>] sk_stream_alloc_skb+0x42/0xaa
 [  762.904542]  [<c0306567>] tcp_sendmsg+0x18f/0x68b
 [  762.904542]  [<c031f3dc>] ? ip_fast_csum+0x30/0x30
 [  762.904542]  [<c0320193>] inet_sendmsg+0x53/0x5a
 [  762.904542]  [<c02cb633>] sock_aio_write+0xd2/0xda
 [  762.904542]  [<c015876b>] ? mark_lock+0x26/0x1bb
 [  762.904542]  [<c01a1017>] do_sync_write+0x9f/0xd9
 [  762.904542]  [<c01a2111>] ? file_free_rcu+0x2f/0x2f
 [  762.904542]  [<c01a17a1>] vfs_write+0x8f/0xab
 [  762.904542]  [<c01a284d>] ? fget_light+0x75/0x7c
 [  762.904542]  [<c01a1900>] sys_write+0x3d/0x5e
 [  762.904542]  [<c0349ec9>] syscall_call+0x7/0xb
 [  762.904542]  [<c0340000>] ? rp_sidt+0x41/0x83


---
Denys Fedoryshchenko

---
Network engineer
Denys Fedoryshchenko

Dora Highway - Center Cebaco - 2nd Floor
Beirut, Lebanon
Tel:	+961 1 247373
E-Mail: denys@xxxxxxxxxxx
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