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PostPosted: Sun Dec 09, 2012 9:41 am 
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Joined: Wed May 13, 2009 1:32 pm
Posts: 737
Location: Italy
As title.
I'm getting this message at boot using CentOS 6.3 and the latest kernel from linode.
Quote:
------------[ cut here ]------------
WARNING: at net/core/skbuff.c:3448 skb_try_coalesce+0x1f2/0x2fe()
Modules linked in:
Pid: 0, comm: swapper/0 Not tainted 3.6.5-x86_64-linode28 #1
Call Trace:
<IRQ> [<ffffffff8103eb12>] warn_slowpath_common+0x80/0x98
[<ffffffff8103eb3f>] warn_slowpath_null+0x15/0x17
[<ffffffff81525dbe>] skb_try_coalesce+0x1f2/0x2fe
[<ffffffff815e6442>] ? ipt_do_table+0x370/0x39c
[<ffffffff815acf18>] tcp_try_coalesce+0x4c/0xa4
[<ffffffff815acfc2>] tcp_queue_rcv+0x52/0x9a
[<ffffffff815afcf4>] tcp_rcv_established+0x367/0x4f6
[<ffffffff815b7acd>] tcp_v4_do_rcv+0xc1/0x207
[<ffffffff815b9063>] tcp_v4_rcv+0x469/0x71e
[<ffffffff815579e6>] ? nf_hook_slow+0x67/0xfa
[<ffffffff8159ac5e>] ? T.1083+0x4f/0x4f
[<ffffffff8159ad9b>] ip_local_deliver_finish+0x13d/0x1ae
[<ffffffff8159ac5e>] ? T.1083+0x4f/0x4f
[<ffffffff8159ae58>] T.1084+0x4c/0x53
[<ffffffff8159aea8>] ip_local_deliver+0x49/0x4d
[<ffffffff8159ab0a>] ip_rcv_finish+0x2c6/0x2de
[<ffffffff8159a844>] ? inet_del_protocol+0x37/0x37
[<ffffffff8159ae58>] T.1084+0x4c/0x53
[<ffffffff8159b0e3>] ip_rcv+0x237/0x264
[<ffffffff81531f78>] __netif_receive_skb+0x41e/0x46d
[<ffffffff81532212>] netif_receive_skb+0x71/0x78
[<ffffffff8148dae2>] handle_incoming_queue+0x54/0xc9
[<ffffffff8148e043>] xennet_poll+0x4ec/0x5b6
[<ffffffff8152c41f>] ? dev_kfree_skb_irq+0x57/0x5b
[<ffffffff81532a28>] net_rx_action+0xb6/0x22f
[<ffffffff816ef546>] ? _raw_spin_lock+0x9/0xd
[<ffffffff813d7bda>] ? info_for_irq+0x9/0x19
[<ffffffff810460e2>] __do_softirq+0xde/0x1d6
[<ffffffff8109d3c2>] ? handle_edge_irq+0xb8/0xca
[<ffffffff816f723c>] call_softirq+0x1c/0x30
[<ffffffff81010bc9>] do_softirq+0x41/0x7e
[<ffffffff81045e8a>] irq_exit+0x44/0xb2
[<ffffffff813d8a83>] xen_evtchn_do_upcall+0x2f/0x3d
[<ffffffff816f728e>] xen_do_hypervisor_callback+0x1e/0x30
<EOI> [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000
[<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000
[<ffffffff81006b53>] ? xen_safe_halt+0x10/0x1a
[<ffffffff8101631f>] ? default_idle+0x4b/0x85
[<ffffffff81015ad4>] ? cpu_idle+0x65/0xa1
[<ffffffff816e2a59>] ? rest_init+0x6d/0x6f
[<ffffffff81cc6c93>] ? start_kernel+0x337/0x344
[<ffffffff81cc6791>] ? kernel_init+0x130/0x130
[<ffffffff81cc62dd>] ? x86_64_start_reservations+0xb8/0xbd
[<ffffffff81cc9bb9>] ? xen_start_kernel+0x3b7/0x3be
---[ end trace f15db969626eafe7 ]---


What does it means?
Thanks.


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PostPosted: Sun Dec 23, 2012 10:44 am 
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Joined: Sun Aug 31, 2008 4:29 pm
Posts: 177
I see the same on one of my two Debian 6 Linodes at boot. (The other, configured almost exactly the same, doesn't show it.)

There doesn't seem to be any ill effects -- the affected Linode runs fine.

Code:
Dec 23 10:13:53 mars kernel: ------------[ cut here ]------------
Dec 23 10:13:53 mars kernel: WARNING: at net/core/skbuff.c:3448 skb_try_coalesce+0x2cf/0x300()
Dec 23 10:13:53 mars kernel: Modules linked in:
Dec 23 10:13:53 mars kernel: Pid: 0, comm: swapper/0 Not tainted 3.6.5-linode47 #1
Dec 23 10:13:53 mars kernel: Call Trace:
Dec 23 10:13:53 mars kernel: [<c0130fd8>] ? warn_slowpath_common+0x78/0xb0
Dec 23 10:13:53 mars kernel: [<c05c0faf>] ? skb_try_coalesce+0x2cf/0x300
Dec 23 10:13:53 mars kernel: [<c05c0faf>] ? skb_try_coalesce+0x2cf/0x300
Dec 23 10:13:53 mars kernel: [<c013102b>] ? warn_slowpath_null+0x1b/0x20
Dec 23 10:13:53 mars kernel: [<c05c0faf>] ? skb_try_coalesce+0x2cf/0x300
Dec 23 10:13:53 mars kernel: [<c066df0c>] ? tcp_queue_rcv+0xdc/0x130
Dec 23 10:13:53 mars kernel: [<c06716f2>] ? tcp_rcv_established+0x222/0x5c0
Dec 23 10:13:53 mars kernel: [<c0659b40>] ? ip_rcv+0x330/0x330
Dec 23 10:13:53 mars kernel: [<c06788e1>] ? tcp_v4_do_rcv+0xf1/0x1e0
Dec 23 10:13:53 mars kernel: [<c06790d5>] ? tcp_v4_rcv+0x705/0x7f0
Dec 23 10:13:53 mars kernel: [<c0659b40>] ? ip_rcv+0x330/0x330
Dec 23 10:13:53 mars kernel: [<c0659bd8>] ? ip_local_deliver_finish+0x98/0x220
Dec 23 10:13:53 mars kernel: [<c0659b40>] ? ip_rcv+0x330/0x330
Dec 23 10:13:53 mars kernel: [<c06595eb>] ? ip_rcv_finish+0xeb/0x310
Dec 23 10:13:53 mars kernel: [<c0659500>] ? inet_del_protocol+0x30/0x30
Dec 23 10:13:53 mars kernel: [<c05c86fa>] ? __netif_receive_skb+0x41a/0x590
Dec 23 10:13:53 mars kernel: [<c05ca0bf>] ? netif_receive_skb+0x1f/0x70
Dec 23 10:13:53 mars kernel: [<c0561149>] ? handle_incoming_queue+0x179/0x260
Dec 23 10:13:53 mars kernel: [<c0561454>] ? xennet_poll+0x224/0x540
Dec 23 10:13:53 mars kernel: [<c0190000>] ? prctl_set_seccomp+0x70/0x80
Dec 23 10:13:53 mars kernel: [<c05caa0a>] ? net_rx_action+0xea/0x1a0
Dec 23 10:13:53 mars kernel: [<c0138720>] ? __do_softirq+0x90/0x140
Dec 23 10:13:53 mars kernel: [<c0138690>] ? irq_enter+0x70/0x70
Dec 23 10:13:53 mars kernel: <IRQ>  [<c01384e6>] ? irq_exit+0x66/0x90
Dec 23 10:13:53 mars kernel: [<c04e8a1d>] ? xen_evtchn_do_upcall+0x1d/0x30
Dec 23 10:13:53 mars kernel: [<c076d887>] ? xen_do_upcall+0x7/0xc
Dec 23 10:13:53 mars kernel: [<c01013a7>] ? hypercall_page+0x3a7/0x1000
Dec 23 10:13:53 mars kernel: [<c010627f>] ? xen_safe_halt+0xf/0x20
Dec 23 10:13:53 mars kernel: [<c01102ec>] ? default_idle+0x1c/0x40
Dec 23 10:13:53 mars kernel: [<c011050a>] ? cpu_idle+0x4a/0x80
Dec 23 10:13:53 mars kernel: [<c0932a9c>] ? start_kernel+0x2e5/0x2ea
Dec 23 10:13:53 mars kernel: [<c0932632>] ? kernel_init+0x127/0x127
Dec 23 10:13:53 mars kernel: [<c0935a71>] ? xen_start_kernel+0x550/0x558
Dec 23 10:13:53 mars kernel: ---[ end trace 9b4cca322e7633d9 ]---


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PostPosted: Sun Dec 23, 2012 11:06 am 
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Joined: Wed May 13, 2009 1:32 pm
Posts: 737
Location: Italy
I solved by switching to the default centos kernel using pv-grub.


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