Date:	Thu, 12 Nov 2015 11:08:18 +0100
From:	Sander Eikelenboom <linux@...elenboom.it>
To:	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: [linux-4.4-mw] BUG: unable to handle kernel paging request
 ip_vs_out.constprop

Hi All,

Just got a crash with a linux-4.4-mw kernel.
I'm using a routed bridge and apart from the splat below i have got some 
interesting other messages that aren't there in 4.3 (and perhaps are of 
interest for the crash as well):
[  207.033768] vif vif-1-0 vif1.0: set_features() failed (-1); wanted 
0x0000000400004803, left 0x0000000400114813
[  207.033780] vif vif-1-0 vif1.0: set_features() failed (-1); wanted 
0x0000000400004803, left 0x0000000400114813
[  207.245435] xen_bridge: error setting offload STP state on port 
1(vif1.0)
[  207.245442] vif vif-1-0 vif1.0: failed to set HW ageing time
[  207.245443] xen_bridge: error setting offload STP state on port 
1(vif1.0)
[  207.245491] vif vif-1-0 vif1.0: set_features() failed (-1); wanted 
0x0000000400004803, left 0x0000000400114813

The commit message for the commit that introduced the "set HW ageing 
time" error message, doesn't seem to tell
me much about it's purpose. If it's not related i can reported as a 
seperate issue.

--
Sander

The crash:
[  354.328687] BUG: unable to handle kernel paging request at 
ffff880049aa8000
[  354.350206] IP: [<ffffffff81a074a7>] ip_vs_out.constprop.25+0x47/0x60
[  354.360882] PGD 2212067 PUD 25b4067 PMD 5ffb6067 PTE 0
[  354.371587] Oops: 0000 [#1] SMP
[  354.382143] Modules linked in:
[  354.392537] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 
4.3.0-mw-20151111-linus-doflr+ #1
[  354.403105] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , BIOS 
V1.8B1 09/13/2010
[  354.413666] task: ffffffff82218580 ti: ffffffff82200000 task.ti: 
ffffffff82200000
[  354.424255] RIP: e030:[<ffffffff81a074a7>]  [<ffffffff81a074a7>] 
ip_vs_out.constprop.25+0x47/0x60
[  354.434742] RSP: e02b:ffff88005f6034b0  EFLAGS: 00010246
[  354.445006] RAX: 0000000000000001 RBX: ffff88005f6034f8 RCX: 
ffff880049aa7ce0
[  354.455262] RDX: ffff88003c0e5500 RSI: 0000000000000003 RDI: 
ffff880004e0e800
[  354.465422] RBP: ffff88005f6034b8 R08: 0000000000000014 R09: 
0000000000000003
[  354.475508] R10: 0000000000000001 R11: ffff880040f394cc R12: 
ffff88005f603528
[  354.485567] R13: ffff88003c0e5500 R14: ffffffff822da2e8 R15: 
ffff88003c0e5500
[  354.495595] FS:  00007f0243c2b700(0000) GS:ffff88005f600000(0000) 
knlGS:0000000000000000
[  354.505474] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  354.515135] CR2: ffff880049aa8000 CR3: 0000000059271000 CR4: 
0000000000000660
[  354.524794] Stack:
[  354.534319]  ffffffff81a074fc ffff88005f6034e8 ffffffff8199e138 
ffff88003c0e5500
[  354.543981]  ffff88005f603528 ffff88003c0e5500 0000000000000000 
ffff88005f603518
[  354.553577]  ffffffff8199e1af ffff880005300048 ffff88003c0e5500 
ffffffff822da2e8
[  354.563160] Call Trace:
[  354.572418]  <IRQ>
[  354.572480]  [<ffffffff81a074fc>] ? ip_vs_local_reply4+0x1c/0x20
[  354.590458]  [<ffffffff8199e138>] nf_iterate+0x58/0x70
[  354.599372]  [<ffffffff8199e1af>] nf_hook_slow+0x5f/0xb0
[  354.608245]  [<ffffffff81a1c73e>] __ip_local_out+0x9e/0xb0
[  354.617036]  [<ffffffff81a1a940>] ? ip_forward_options+0x1a0/0x1a0
[  354.625874]  [<ffffffff81a1c767>] ip_local_out+0x17/0x40
[  354.634383]  [<ffffffff81a1c8d8>] ip_build_and_send_pkt+0x148/0x1c0
[  354.642715]  [<ffffffff81a39796>] tcp_v4_send_synack+0x56/0xa0
[  354.650893]  [<ffffffff81a22b88>] ? 
inet_csk_reqsk_queue_hash_add+0x68/0x90
[  354.659083]  [<ffffffff81a2b98d>] tcp_conn_request+0x95d/0x970
[  354.667196]  [<ffffffff810ccfa6>] ? __local_bh_enable_ip+0x26/0x90
[  354.675246]  [<ffffffff81a38bc7>] tcp_v4_conn_request+0x47/0x50
[  354.683254]  [<ffffffff81a30663>] tcp_rcv_state_process+0x183/0xca0
[  354.691004]  [<ffffffff81a37a7c>] tcp_v4_do_rcv+0x5c/0x1f0
[  354.698533]  [<ffffffff81a3a2b7>] tcp_v4_rcv+0x987/0x9a0
[  354.705968]  [<ffffffff81a5deb8>] ? ipv4_confirm+0x78/0xf0
[  354.713370]  [<ffffffff81a172f4>] ip_local_deliver_finish+0x84/0x120
[  354.720739]  [<ffffffff81a17842>] ip_local_deliver+0x42/0xd0
[  354.728029]  [<ffffffff81a17270>] ? inet_del_offload+0x40/0x40
[  354.735270]  [<ffffffff81a17496>] ip_rcv_finish+0x106/0x320
[  354.742413]  [<ffffffff81a17ae1>] ip_rcv+0x211/0x370
[  354.749268]  [<ffffffff81a17390>] ? 
ip_local_deliver_finish+0x120/0x120
[  354.755929]  [<ffffffff8196cd9b>] 
__netif_receive_skb_core+0x2cb/0x970
[  354.762535]  [<ffffffff819bb75a>] ? nf_nat_setup_info+0x7a/0x2f0
[  354.769131]  [<ffffffff8196f381>] __netif_receive_skb+0x11/0x70
[  354.775481]  [<ffffffff8196f3fe>] 
netif_receive_skb_internal+0x1e/0x80
[  354.781638]  [<ffffffff8199e1af>] ? nf_hook_slow+0x5f/0xb0
[  354.787771]  [<ffffffff8196f469>] netif_receive_skb+0x9/0x10
[  354.793916]  [<ffffffff81a7a1a8>] br_handle_frame_finish+0x178/0x4b0
[  354.800077]  [<ffffffff81a5ec07>] ? nf_nat_ipv4_fn+0x167/0x1e0
[  354.806260]  [<ffffffff81a7a020>] ? br_handle_local_finish+0x50/0x50
[  354.812405]  [<ffffffff81a85193>] 
br_nf_pre_routing_finish+0x183/0x360
[  354.818574]  [<ffffffff81a7a030>] ? br_netif_receive_skb+0x10/0x10
[  354.824775]  [<ffffffff81a85707>] br_nf_pre_routing+0x2a7/0x380
[  354.830780]  [<ffffffff81a85010>] ? br_nf_forward_ip+0x3f0/0x3f0
[  354.836567]  [<ffffffff8199e138>] nf_iterate+0x58/0x70
[  354.842281]  [<ffffffff8199e1af>] nf_hook_slow+0x5f/0xb0
[  354.847886]  [<ffffffff81a7a682>] br_handle_frame+0x1a2/0x290
[  354.853520]  [<ffffffff81a7a030>] ? br_netif_receive_skb+0x10/0x10
[  354.859206]  [<ffffffff81a7a4e0>] ? 
br_handle_frame_finish+0x4b0/0x4b0
[  354.864824]  [<ffffffff8196cbfb>] 
__netif_receive_skb_core+0x12b/0x970
[  354.870350]  [<ffffffff810fe841>] ? 
__raw_callee_save___pv_queued_spin_unlock+0x11/0x20
[  354.875880]  [<ffffffff8196f381>] __netif_receive_skb+0x11/0x70
[  354.881293]  [<ffffffff8196f3fe>] 
netif_receive_skb_internal+0x1e/0x80
[  354.886653]  [<ffffffff8196f469>] netif_receive_skb+0x9/0x10
[  354.891918]  [<ffffffff8173c693>] xenvif_tx_action+0x693/0x820
[  354.897170]  [<ffffffff8173ebf9>] xenvif_poll+0x29/0x70
[  354.902426]  [<ffffffff819706e7>] net_rx_action+0x1f7/0x300
[  354.907636]  [<ffffffff810ccda3>] __do_softirq+0x103/0x210
[  354.912837]  [<ffffffff810cd0ab>] irq_exit+0x4b/0xa0
[  354.917940]  [<ffffffff814de7d0>] xen_evtchn_do_upcall+0x30/0x40
[  354.923051]  [<ffffffff81af173e>] 
xen_do_hypervisor_callback+0x1e/0x40
[  354.928089]  <EOI>
[  354.928175]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  354.938047]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  354.942985]  [<ffffffff81009420>] ? xen_safe_halt+0x10/0x20
[  354.947859]  [<ffffffff810193c3>] ? default_idle+0x13/0x20
[  354.952664]  [<ffffffff810198fa>] ? arch_cpu_idle+0xa/0x10
[  354.957470]  [<ffffffff810fc25e>] ? default_idle_call+0x2e/0x50
[  354.962291]  [<ffffffff810fc4f2>] ? cpu_startup_entry+0x272/0x2e0
[  354.967063]  [<ffffffff81ae89c7>] ? rest_init+0x77/0x80
[  354.971854]  [<ffffffff82316f43>] ? start_kernel+0x438/0x445
[  354.976640]  [<ffffffff823164ef>] ? 
x86_64_start_reservations+0x2a/0x2c
[  354.981457]  [<ffffffff82319fad>] ? xen_start_kernel+0x555/0x561
[  354.986277] Code: 48 f7 42 58 fe ff ff ff b8 01 00 00 00 74 13 8b 4f 
04 85 c9 74 0a 55 48 89 e5 e8 05 fa ff ff 5d f3 c3 f3 c3 66 83 79 10 02 
75 d5 <80> b9 20 03 00 00 00 79 cc c3 66 66 66 66 66 66 2e 0f 1f 84 00
[  354.996803] RIP  [<ffffffff81a074a7>] 
ip_vs_out.constprop.25+0x47/0x60
[  355.002021]  RSP <ffff88005f6034b0>
[  355.007159] CR2: ffff880049aa8000
[  355.012294] ---[ end trace 5b3b3b699aee4fc6 ]---
[  355.017424] Kernel panic - not syncing: Fatal exception in interrupt
[  355.022732] Kernel Offset: disabled
(XEN) [2015-11-11 15:45:14.718] Hardware Dom0 crashed: rebooting machine 
in 5 seconds.

(gdb) list *0xffffffff81a074a7
0xffffffff81a074a7 is in ip_vs_out 
(net/netfilter/ipvs/ip_vs_core.c:1192).
1187		if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT &&
1188			     af == AF_INET)) {
1189			struct sock *sk = skb->sk;
1190			struct inet_sock *inet = inet_sk(skb->sk);
1191
1192			if (inet && sk->sk_family == PF_INET && inet->nodefrag)
1193				return NF_ACCEPT;
1194		}
1195
1196		if (unlikely(!skb_dst(skb)))


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