netdev - Re: WARNING: at net/core/dst.c:274 dst

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Date:	Tue, 2 Jul 2013 17:44:40 -0400
From:	Fernando Soto <fernando.soto@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: WARNING: at net/core/dst.c:274 dst_release+0x2d/0x56()

Hi Eric,

Thanks! I'll try and let you know.

Fernando

On Tue, Jul 2, 2013 at 5:13 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Tue, 2013-07-02 at 17:05 -0400, Fernando Soto wrote:
>> Please CC me. I am not subscribed to the list.
>>
>> While running iperf network throughput tests between two Linux VMs
>> with kernel 3.5.4 in a Hyper-V environment (Host: Win 2K8 R2 P1), I
>> consistently run into this kernel warning after 1 or 2 days:
>>
>> Jun 29 14:45:44 new kernel: [158511.461245] ------------[ cut here ]------------
>> Jun 29 14:45:44 new kernel: [158511.461422] WARNING: at
>> net/core/dst.c:274 dst_release+0x2d/0x56()
>> Jun 29 14:45:44 new kernel: [158511.461667] Hardware name: Virtual Machine
>> Jun 29 14:45:44 new kernel: [158511.462020] Modules linked in: drbd
>> lru_cache psmouse crc32c_intel i2c_piix4 microcode hv_utils processor
>> cn thermal_sys evdev i2c_core button hv_netvsc hv_storvsc hv_vmbus
>> floppy sr_mod cdrom [last
>>
>> unloaded: scsi_wait_scan]
>> Jun 29 14:45:44 new kernel: [158511.465332] Pid: 2611, comm: iperf Not
>> tainted 3.5.4-amd64 #1
>> Jun 29 14:45:44 new kernel: [158511.465461] Call Trace:
>> Jun 29 14:45:44 new kernel: [158511.465627]  [<ffffffff8103602c>] ?
>> warn_slowpath_common+0x76/0x8a
>> Jun 29 14:45:44 new kernel: [158511.465834]  [<ffffffff8147de3b>] ?
>> dst_release+0x2d/0x56
>> Jun 29 14:45:44 new kernel: [158511.466160]  [<ffffffff8146e068>] ?
>> skb_release_head_state+0x1e/0xe3
>> Jun 29 14:45:44 new kernel: [158511.466339]  [<ffffffff8146df19>] ?
>> __kfree_skb+0x9/0x77
>> Jun 29 14:45:44 new kernel: [158511.466529]  [<ffffffff814a9a9e>] ?
>> tcp_recvmsg+0x6e3/0x96a
>> Jun 29 14:45:44 new kernel: [158511.466850]  [<ffffffff814c3695>] ?
>> inet_recvmsg+0x5a/0x6e
>> Jun 29 14:45:44 new kernel: [158511.467632]  [<ffffffff81465832>] ?
>> __sock_recvmsg_nosec+0x29/0x69
>> Jun 29 14:45:44 new kernel: [158511.467805]  [<ffffffff81466c65>] ?
>> sock_recvmsg+0xc8/0xe8
>> Jun 29 14:45:44 new kernel: [158511.467907]  [<ffffffff810bd822>] ?
>> pagevec_lookup+0x1c/0x1c
>> Jun 29 14:45:44 new kernel: [158511.468004]  [<ffffffff810ba013>] ?
>> __free_one_page+0x1cb/0x24b
>> Jun 29 14:45:44 new kernel: [158511.468101]  [<ffffffff814b085c>] ?
>> tcp_rcv_established+0x479/0x5b0
>> Jun 29 14:45:44 new kernel: [158511.468196]  [<ffffffff814b085c>] ?
>> tcp_rcv_established+0x479/0x5b0
>> Jun 29 14:45:44 new kernel: [158511.468294]  [<ffffffff810ec000>] ?
>> fget_light+0x63/0x74
>> Jun 29 14:45:44 new kernel: [158511.468408]  [<ffffffff81466df1>] ?
>> sockfd_lookup_light+0x17/0x4c
>> Jun 29 14:45:44 new kernel: [158511.468505]  [<ffffffff814687c4>] ?
>> sys_recvfrom+0xc1/0x123
>> Jun 29 14:45:44 new kernel: [158511.468599]  [<ffffffff8101989b>] ?
>> read_hv_clock+0x13/0x1c
>> Jun 29 14:45:44 new kernel: [158511.468704]  [<ffffffff8106b762>] ?
>> timekeeping_get_ns+0xd/0x2a
>> Jun 29 14:45:44 new kernel: [158511.468801]  [<ffffffff8106bb16>] ?
>> getnstimeofday+0x4d/0x7e
>> Jun 29 14:45:44 new kernel: [158511.468906]  [<ffffffff8106bb76>] ?
>> do_gettimeofday+0x10/0x30
>> Jun 29 14:45:44 new kernel: [158511.469007]  [<ffffffff8105922a>] ?
>> should_resched+0x5/0x23
>> Jun 29 14:45:44 new kernel: [158511.469116]  [<ffffffff81546783>] ?
>> _cond_resched+0x6/0x1a
>> Jun 29 14:45:44 new kernel: [158511.469216]  [<ffffffff8154d1fd>] ?
>> system_call_fastpath+0x1a/0x1f
>> Jun 29 14:45:44 new kernel: [158511.469307] ---[ end trace 1f424b332c392ece ]---
>> Jun 29 14:45:44 new kernel: [158511.469516] ------------[ cut here ]------------
>>
>>
>> Iperf arguments:
>> server VM
>> # iperf -s -i 5
>>
>> client VM:
>> # iperf -c 172.31.248.141 -d -t 1000000 -i 5 -r
>>
>> The same problem can't be reproduced on an ESX environment.
>>
>> Any help is appreciated.
>>
>> Thanks,
>> Fernando Soto
>
> Make sure you have following fix :
>
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=093162553c33e9479283e107b4431378271c735d
>
>
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