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Date: Sun, 29 Apr 2012 10:45:08 +0300
From: Denys Fedoryshchenko <denys@...p.net.lb>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: <netdev@...r.kernel.org>, Glauber Costa <glommer@...allels.com>
Subject: Re: kernel panic, inconsistent lock, vanilla 3.3.4, 32bit, tcp
On 2012-04-29 10:32, Eric Dumazet wrote:
> On Sun, 2012-04-29 at 00:45 +0300, Denys Fedoryshchenko wrote:
>> Hi
>>
>> Just got repeatable kernel panic on loaded proxy server
>>
>> Here is the log:
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.903868]
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.903880]
>> =================================
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.903890] [ INFO:
>> inconsistent
>> lock state ]
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.903903] 3.3.4-build-0061 #8
>> Not tainted
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904133]
>> ---------------------------------
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904344] inconsistent
>> {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] squid/1603
>> [HC0[0]:SC0[0]:HE1:SE1] takes:
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] (key#3){+.?...},
>> at:
>> [<c0232cc4>] __percpu_counter_sum+0xd/0x58
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] {IN-SOFTIRQ-W}
>> state
>> was registered at:
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0158b84>]
>> __lock_acquire+0x284/0xc26
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c01598e8>]
>> lock_acquire+0x71/0x85
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0349765>]
>> _raw_spin_lock+0x33/0x40
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0232c93>]
>> __percpu_counter_add+0x58/0x7c
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02cfde1>]
>> sk_clone_lock+0x1e5/0x200
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0303ee4>]
>> inet_csk_clone_lock+0xe/0x78
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0315778>]
>> tcp_create_openreq_child+0x1b/0x404
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c031339c>]
>> tcp_v4_syn_recv_sock+0x32/0x1c1
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c031615a>]
>> tcp_check_req+0x1fd/0x2d7
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0313f77>]
>> tcp_v4_do_rcv+0xab/0x194
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c03153bb>]
>> tcp_v4_rcv+0x3b3/0x5cc
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02fc0c4>]
>> ip_local_deliver_finish+0x13a/0x1e9
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02fc539>]
>> NF_HOOK.clone.11+0x46/0x4d
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02fc652>]
>> ip_local_deliver+0x41/0x45
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02fc4d1>]
>> ip_rcv_finish+0x31a/0x33c
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02fc539>]
>> NF_HOOK.clone.11+0x46/0x4d
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02fc857>]
>> ip_rcv+0x201/0x23e
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02daa3a>]
>> __netif_receive_skb+0x319/0x368
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02dac07>]
>> netif_receive_skb+0x4e/0x7d
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02dacf6>]
>> napi_skb_finish+0x1e/0x34
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02db122>]
>> napi_gro_receive+0x20/0x24
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<f85d1743>]
>> e1000_receive_skb+0x3f/0x45 [e1000e]
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<f85d3464>]
>> e1000_clean_rx_irq+0x1f9/0x284 [e1000e]
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<f85d3926>]
>> e1000_clean+0x62/0x1f4 [e1000e]
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02db228>]
>> net_rx_action+0x90/0x160
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c012a445>]
>> __do_softirq+0x7b/0x118
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] irq event stamp:
>> 156915469
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] hardirqs last
>> enabled
>> at (156915469): [<c019b4f4>]
>> __slab_alloc.clone.58.clone.63+0xc4/0x2de
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] hardirqs last
>> disabled
>> at (156915468): [<c019b452>]
>> __slab_alloc.clone.58.clone.63+0x22/0x2de
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] softirqs last
>> enabled
>> at (156915466): [<c02ce677>] lock_sock_nested+0x64/0x6c
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] softirqs last
>> disabled
>> at (156915464): [<c0349914>] _raw_spin_lock_bh+0xe/0x45
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542]
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] other info that
>> might
>> help us debug this:
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] Possible unsafe
>> locking scenario:
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542]
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] CPU0
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] ----
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] lock(key#3);
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] <Interrupt>
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] lock(key#3);
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542]
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] *** DEADLOCK ***
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542]
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] 1 lock held by
>> squid/1603:
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] #0:
>> (sk_lock-AF_INET){+.+.+.}, at: [<c03055c0>] lock_sock+0xa/0xc
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542]
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] stack backtrace:
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] Pid: 1603, comm:
>> squid
>> Not tainted 3.3.4-build-0061 #8
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] Call Trace:
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0347b73>] ?
>> printk+0x18/0x1d
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c015873a>]
>> valid_state+0x1f6/0x201
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0158816>]
>> mark_lock+0xd1/0x1bb
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c015876b>] ?
>> mark_lock+0x26/0x1bb
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c015805d>] ?
>> check_usage_forwards+0x77/0x77
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0158bf8>]
>> __lock_acquire+0x2f8/0xc26
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0159b8e>] ?
>> mark_held_locks+0x5d/0x7b
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0159cf6>] ?
>> trace_hardirqs_on+0xb/0xd
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0158dd4>] ?
>> __lock_acquire+0x4d4/0xc26
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c01598e8>]
>> lock_acquire+0x71/0x85
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0232cc4>] ?
>> __percpu_counter_sum+0xd/0x58
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0349765>]
>> _raw_spin_lock+0x33/0x40
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0232cc4>] ?
>> __percpu_counter_sum+0xd/0x58
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0232cc4>]
>> __percpu_counter_sum+0xd/0x58
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02cebc4>]
>> __sk_mem_schedule+0xdd/0x1c7
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02d178d>] ?
>> __alloc_skb+0x76/0x100
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0305e8e>]
>> sk_wmem_schedule+0x21/0x2d
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0306370>]
>> sk_stream_alloc_skb+0x42/0xaa
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0306567>]
>> tcp_sendmsg+0x18f/0x68b
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c031f3dc>] ?
>> ip_fast_csum+0x30/0x30
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0320193>]
>> inet_sendmsg+0x53/0x5a
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c02cb633>]
>> sock_aio_write+0xd2/0xda
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c015876b>] ?
>> mark_lock+0x26/0x1bb
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c01a1017>]
>> do_sync_write+0x9f/0xd9
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c01a2111>] ?
>> file_free_rcu+0x2f/0x2f
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c01a17a1>]
>> vfs_write+0x8f/0xab
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c01a284d>] ?
>> fget_light+0x75/0x7c
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c01a1900>]
>> sys_write+0x3d/0x5e
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0349ec9>]
>> syscall_call+0x7/0xb
>> Apr 29 00:38:17 10.0.15.2 kernel: [ 762.904542] [<c0340000>] ?
>> rp_sidt+0x41/0x83
>>
>>
>> ---
>> Denys Fedoryshchenko
>
> Seems to be related to Glauber Costa work
>
> sk_memory_allocated_add() seems to assume __percpu_counter_add() is
> irq
> safe (truth is : it is not safe)
Thanks Eric, and sorry for mangled post (long lines). I was very
sleepy, and resent it properly now.
I will try to check his patches.
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