Xen project Mailing List

Re: [Xen-devel] domU to domU networking issues in v3.7? (netserver/netperf failing to communicate)

Wednesday, November 14, 2012, 7:24:53 AM, you wrote: > On Mon, Nov 12, 2012 at 06:20:55PM +0100, Sander Eikelenboom wrote: >> >> Monday, November 12, 2012, 5:32:04 PM, you wrote: >> >> > On Mon, Nov 12, 2012 at 03:50:24PM +0100, Sander Eikelenboom wrote: >> >> >> >> Monday, November 12, 2012, 3:28:35 PM, you wrote: >> >> >> >> > On Mon, Nov 12, 2012 at 09:54:44AM +0000, Ian Campbell wrote: >> >> >> On Sat, 2012-11-10 at 13:59 +0000, Konrad Rzeszutek Wilk wrote: >> >> >> > Hey Ian, Xen-devel mailingl list, >> >> >> > >> >> >> > I think the issue of 70% traffic lost was actually introduced in >> >> >> > v3.6 or >> >> >> > perhaps v3.5. Annie and Marcos (CC-ed here) are looking to see which >> >> >> > of >> >> >> > the releases introduced this. The issue we are seeing is that a domU >> >> >> > to domU communication breaks - this is with netperf/netserver >> >> >> > talking to >> >> >> > each other. >> >> >> > >> >> >> > Anyhow, I think the 3.7 compound page exacerbated the problem and >> >> >> > also >> >> >> > (at least on some of my test hardware) exposed existing issues with >> >> >> > drivers. The issue I have is that the 'skge' driver has a bug that >> >> >> > has >> >> >> > been there for ages (I tested way back to 3.0 and still saw it) were >> >> >> > it >> >> >> > can not work with SWIOTLB. It is probably missing an pci_dma_sync >> >> >> > somewhere. >> >> >> > >> >> >> > Anyhow the compound page got me to look at Xen-SWIOTLB and that looks >> >> >> > OK. Even with synthetic driver (the fake one I posted somewhere) it >> >> >> > dealt with compound pages properly (with debug or non-debug Xen >> >> >> > hypervisor). >> >> >> >> >> >> The debug build is probably most interesting since it deliberately >> >> >> allocates a non 1-1 p-to-m mapping so as to catch exactly these sorts >> >> >> of >> >> >> issues. >> >> >> >> > Right. My test env runs with that. And so far it only has issues >> >> > with the skge one. >> >> >> >> >> >> > So was wondering if you had looked at this in more details? Any >> >> >> > ideas? Or would it be more prudent to ask that once we know for sure >> >> >> > which Linux release introduced the communication failures between >> >> >> > guests? >> >> >> >> >> >> I've not looked at it any further I'm afraid. >> >> >> >> >> >> If these changes (be they in 3.5 or later, or earlier) are exposing >> >> >> driver bugs then I suspect the netdev chaps would want to know about >> >> >> it. >> >> >> >> > Right. Annie (CC-ed here) mentioned to me that v3.5 looks to work ok. >> >> > And is off checking v3.6. v3.7 is definitly a no go. >> >> >> >> >> >> FWIW I see the issue with tg3. >> >> >> >> After the issues with netback where fixed, I'm seeing the issues with >> >> net_front reverting the single commit >> >> 5640f7685831e088fe6c2e1f863a6805962f8e81 (that was pointed out for >> >> netback) also makes these disappear. >> >> > Were you ever able to trigger the BUG_ON in the patch that Ian posted? >> >> What exact patch (or any other patch that can help you ) ? >> (so i can try again to be sure) > This one: > http://lists.xen.org/archives/html/xen-devel/2012-10/msg00893.html Sorry for the late response! I have changed the bug_on in a warn_on and applied it to a kernel with and without commit 5640f7685831e088fe6c2e1f863a6805962f8e81 reverted. - With commit 5640f7685831e088fe6c2e1f863a6805962f8e81 reverted I don't see any warnings (also after loading domU's with a few GB of network traffic) - With a vanilla kernel and the patch, i can just ssh to a domU to see the warnings, after which SSH locks up. So it happens immediately, even without giving the domU any serious network load. [ 85.447191] <IRQ> [<ffffffff8106750a>] warn_slowpath_common+0x7a/0xb0 [ 85.447201] [<ffffffff81067555>] warn_slowpath_null+0x15/0x20 [ 85.447207] [<ffffffff814b2b6e>] xennet_start_xmit+0x7fe/0x860 [ 85.447213] [<ffffffff816a6169>] dev_hard_start_xmit+0x209/0x460 [ 85.447220] [<ffffffff816c1e56>] sch_direct_xmit+0xf6/0x290 [ 85.447225] [<ffffffff816a6566>] dev_queue_xmit+0x1a6/0x5a0 [ 85.447231] [<ffffffff816a63c0>] ? dev_hard_start_xmit+0x460/0x460 [ 85.447238] [<ffffffff816b0897>] neigh_resolve_output+0x127/0x250 [ 85.447244] [<ffffffff817405ad>] ip_finish_output+0x39d/0x530 [ 85.447250] [<ffffffff817402dd>] ? ip_finish_output+0xcd/0x530 [ 85.447256] [<ffffffff81740799>] ip_output+0x59/0xe0 [ 85.447262] [<ffffffff8173f2b8>] ip_local_out+0x28/0x90 [ 85.447267] [<ffffffff8173f86f>] ip_queue_xmit+0x17f/0x4a0 [ 85.447273] [<ffffffff8173f6f0>] ? ip_send_unicast_reply+0x340/0x340 [ 85.447282] [<ffffffff810a1cf7>] ? getnstimeofday+0x47/0xe0 [ 85.447288] [<ffffffff816962c9>] ? __skb_clone+0x29/0x120 [ 85.447294] [<ffffffff81755940>] tcp_transmit_skb+0x400/0x8d0 [ 85.447303] [<ffffffff8113ad55>] ? kmem_cache_free+0x125/0x1c0 [ 85.450359] [<ffffffff8175891a>] tcp_write_xmit+0x21a/0xa50 [ 85.450359] [<ffffffff81698c82>] ? __kfree_skb+0x42/0xa0 [ 85.450359] [<ffffffff817591bd>] __tcp_push_pending_frames+0x2d/0x90 [ 85.450359] [<ffffffff817545c4>] tcp_rcv_established+0x164/0x640 [ 85.450359] [<ffffffff8175cdbf>] ? tcp_v4_rcv+0x6cf/0xb10 [ 85.450359] [<ffffffff8175c3a5>] tcp_v4_do_rcv+0x135/0x480 [ 85.450359] [<ffffffff817d0dc2>] ? _raw_spin_lock_nested+0x42/0x50 [ 85.450359] [<ffffffff8175cdbf>] ? tcp_v4_rcv+0x6cf/0xb10 [ 85.450359] [<ffffffff8175d04d>] tcp_v4_rcv+0x95d/0xb10 [ 85.450359] [<ffffffff810b2158>] ? lock_acquire+0xd8/0x100 [ 85.450359] [<ffffffff81739895>] ? ip_local_deliver_finish+0x45/0x230 [ 85.450359] [<ffffffff8173996a>] ip_local_deliver_finish+0x11a/0x230 [ 85.450359] [<ffffffff81739895>] ? ip_local_deliver_finish+0x45/0x230 [ 85.450359] [<ffffffff81739ab8>] ip_local_deliver+0x38/0x80 [ 85.450359] [<ffffffff8173907a>] ip_rcv_finish+0x15a/0x630 [ 85.450359] [<ffffffff81739768>] ip_rcv+0x218/0x300 [ 85.450359] [<ffffffff816a1a9d>] __netif_receive_skb+0x65d/0x8d0 [ 85.450359] [<ffffffff816a1585>] ? __netif_receive_skb+0x145/0x8d0 [ 85.450359] [<ffffffff810ae3fd>] ? trace_hardirqs_on+0xd/0x10 [ 85.450359] [<ffffffff810faf83>] ? free_hot_cold_page+0x1b3/0x1e0 [ 85.450359] [<ffffffff816a4008>] netif_receive_skb+0x28/0xf0 [ 85.450359] [<ffffffff81699b13>] ? __pskb_pull_tail+0x253/0x340 [ 85.450359] [<ffffffff814b3795>] xennet_poll+0xad5/0xe10 [ 85.450359] [<ffffffff816a4db6>] net_rx_action+0x136/0x260 [ 85.450359] [<ffffffff8106f3a1>] ? __do_softirq+0x71/0x1a0 [ 85.450359] [<ffffffff8106f3f9>] __do_softirq+0xc9/0x1a0 [ 85.450359] [<ffffffff817d393c>] call_softirq+0x1c/0x30 [ 85.450359] [<ffffffff8100fd95>] do_softirq+0x85/0xf0 [ 85.450359] [<ffffffff8106f26e>] irq_exit+0x9e/0xd0 [ 85.450359] [<ffffffff8134659f>] xen_evtchn_do_upcall+0x2f/0x40 [ 85.450359] [<ffffffff817d399e>] xen_do_hypervisor_callback+0x1e/0x30 [ 85.450359] <EOI> [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20 [ 85.450359] [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20 [ 85.450359] [<ffffffff8100880d>] ? xen_force_evtchn_callback+0xd/0x10 [ 85.450359] [<ffffffff810091b2>] ? check_events+0x12/0x20 [ 85.450359] [<ffffffff8100919f>] ? xen_restore_fl_direct_reloc+0x4/0x4 [ 85.450359] [<ffffffff810adfc0>] ? lockdep_trace_alloc+0xa0/0x130 [ 85.450359] [<ffffffff810fc9ad>] ? __alloc_pages_nodemask+0x8d/0x9a0 [ 85.450359] [<ffffffff810b2158>] ? lock_acquire+0xd8/0x100 [ 85.450359] [<ffffffff810b25e7>] ? lock_release+0x117/0x250 [ 85.450359] [<ffffffff812a332e>] ? check_blkcg_changed+0x8e/0x180 [ 85.450359] [<ffffffff812a32a0>] ? cfq_put_queue+0x220/0x220 [ 85.450359] [<ffffffff810b2158>] ? lock_acquire+0xd8/0x100 [ 85.450359] [<ffffffff81132f21>] ? alloc_pages_vma+0xc1/0x1d0 [ 85.450359] [<ffffffff8110752a>] ? shmem_alloc_page+0x5a/0x70 [ 85.450359] [<ffffffff810b25e7>] ? lock_release+0x117/0x250 [ 85.450359] [<ffffffff810f40fd>] ? find_get_page+0xad/0x100 [ 85.450359] [<ffffffff810f4050>] ? find_get_pages+0x190/0x190 [ 85.450359] [<ffffffff810b171b>] ? __lock_acquire+0x46b/0xdd0 [ 85.450359] [<ffffffff810f43d1>] ? find_lock_page+0x21/0x80 [ 85.450359] [<ffffffff81107c3f>] ? shmem_getpage_gfp+0x33f/0x720 [ 85.450359] [<ffffffff811080f6>] ? shmem_fault+0x46/0x70 [ 85.450359] [<ffffffff812a2d33>] ? cfq_add_cfqq_rr+0x33/0x100 [ 85.450359] [<ffffffff81269f79>] ? shm_fault+0x19/0x20 [ 85.450359] [<ffffffff81114de7>] ? __do_fault+0x67/0x4f0 [ 85.450359] [<ffffffff8111885d>] ? handle_pte_fault+0xfd/0x820 [ 85.450359] [<ffffffff8100509f>] ? pte_mfn_to_pfn+0x8f/0xf0 [ 85.450359] [<ffffffff81005159>] ? xen_pmd_val+0x9/0x10 [ 85.450359] [<ffffffff81119208>] ? handle_mm_fault+0x288/0x360 [ 85.450359] [<ffffffff8103eafc>] ? __do_page_fault+0x15c/0x510 [ 85.450359] [<ffffffff8128e2f3>] ? blk_finish_plug+0x13/0x50 [ 85.450359] [<ffffffff810ffc99>] ? __do_page_cache_readahead+0x229/0x2b0 [ 85.450359] [<ffffffff810ffb25>] ? __do_page_cache_readahead+0xb5/0x2b0 [ 85.450359] [<ffffffff810ac927>] ? trace_hardirqs_off_caller+0x77/0x150 [ 85.450359] [<ffffffff812b55ad>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 85.450359] [<ffffffff8103eeb9>] ? do_page_fault+0x9/0x10 [ 85.450359] [<ffffffff817d20b8>] ? page_fault+0x28/0x30 [ 85.450359] [<ffffffff810f39a6>] ? file_read_actor+0x66/0x190 [ 85.450359] [<ffffffff81100230>] ? page_cache_async_readahead+0x80/0xa0 [ 85.450359] [<ffffffff810f4050>] ? find_get_pages+0x190/0x190 [ 85.450359] [<ffffffff810f6050>] ? generic_file_aio_read+0x2e0/0x6f0 [ 85.450359] [<ffffffff81144c82>] ? do_sync_read+0xa2/0xe0 [ 85.450359] [<ffffffff811459f5>] ? vfs_read+0xc5/0x190 [ 85.450359] [<ffffffff81145bca>] ? sys_read+0x5a/0xa0 [ 85.450359] [<ffffffff812b556e>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 85.450359] [<ffffffff817d26a9>] ? system_call_fastpath+0x16/0x1b [ 85.450359] ---[ end trace ce03efc8ae5a5e97 ]--- [ 85.650129] ------------[ cut here ]------------ [ 85.650147] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860() [ 85.650154] Modules linked in: [ 85.650161] Pid: 0, comm: swapper/0 Tainted: G W 3.7.0-rc5-20121116-vanilla-warn #1 [ 85.650167] Call Trace: [ 85.650171] <IRQ> [<ffffffff8106750a>] warn_slowpath_common+0x7a/0xb0 [ 85.650183] [<ffffffff81067555>] warn_slowpath_null+0x15/0x20 [ 85.650189] [<ffffffff814b2b6e>] xennet_start_xmit+0x7fe/0x860 [ 85.650196] [<ffffffff816a6169>] dev_hard_start_xmit+0x209/0x460 [ 85.650203] [<ffffffff816c1e56>] sch_direct_xmit+0xf6/0x290 [ 85.650208] [<ffffffff816a6566>] dev_queue_xmit+0x1a6/0x5a0 [ 85.650214] [<ffffffff816a63c0>] ? dev_hard_start_xmit+0x460/0x460 [ 85.650221] [<ffffffff810b25e7>] ? lock_release+0x117/0x250 [ 85.650227] [<ffffffff81740436>] ip_finish_output+0x226/0x530 [ 85.650234] [<ffffffff817402dd>] ? ip_finish_output+0xcd/0x530 [ 85.650240] [<ffffffff81740799>] ip_output+0x59/0xe0 [ 85.650245] [<ffffffff8173f2b8>] ip_local_out+0x28/0x90 [ 85.650251] [<ffffffff8173f86f>] ip_queue_xmit+0x17f/0x4a0 [ 85.650256] [<ffffffff8173f6f0>] ? ip_send_unicast_reply+0x340/0x340 [ 85.650262] [<ffffffff810a1cf7>] ? getnstimeofday+0x47/0xe0 [ 85.650268] [<ffffffff816962c9>] ? __skb_clone+0x29/0x120 [ 85.650274] [<ffffffff81755940>] tcp_transmit_skb+0x400/0x8d0 [ 85.650280] [<ffffffff81758026>] tcp_retransmit_skb+0x1c6/0x5a0 [ 85.650290] [<ffffffff8175a300>] ? tcp_write_timer_handler+0x1a0/0x1a0 [ 85.650296] [<ffffffff81759e70>] tcp_retransmit_timer+0x370/0x660 [ 85.650303] [<ffffffff8175a29d>] tcp_write_timer_handler+0x13d/0x1a0 [ 85.650309] [<ffffffff8175a378>] tcp_write_timer+0x78/0x80 [ 85.650315] [<ffffffff81074f9c>] call_timer_fn+0x7c/0x100 [ 85.650321] [<ffffffff81074f20>] ? cascade+0xa0/0xa0 [ 85.650326] [<ffffffff8175a300>] ? tcp_write_timer_handler+0x1a0/0x1a0 [ 85.650332] [<ffffffff8175a300>] ? tcp_write_timer_handler+0x1a0/0x1a0 [ 85.650338] [<ffffffff81075237>] run_timer_softirq+0x217/0x250 [ 85.650344] [<ffffffff8106f3f9>] __do_softirq+0xc9/0x1a0 [ 85.650350] [<ffffffff817d393c>] call_softirq+0x1c/0x30 [ 85.650356] [<ffffffff8100fd95>] do_softirq+0x85/0xf0 [ 85.650362] [<ffffffff8106f26e>] irq_exit+0x9e/0xd0 [ 85.650369] [<ffffffff8134659f>] xen_evtchn_do_upcall+0x2f/0x40 [ 85.650374] [<ffffffff817d399e>] xen_do_hypervisor_callback+0x1e/0x30 [ 85.650379] <EOI> [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20 [ 85.650389] [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20 [ 85.650396] [<ffffffff81008850>] ? xen_safe_halt+0x10/0x20 [ 85.650402] [<ffffffff810170f0>] ? default_idle+0x40/0x90 [ 85.650408] [<ffffffff810174a6>] ? cpu_idle+0x96/0xf0 [ 85.650415] [<ffffffff817a9c8c>] ? rest_init+0xbc/0xd0 [ 85.650420] [<ffffffff817a9bd0>] ? csum_partial_copy_generic+0x170/0x170 [ 85.650428] [<ffffffff81ce4be7>] ? start_kernel+0x390/0x39d [ 85.650433] [<ffffffff81ce4677>] ? repair_env_string+0x5b/0x5b [ 85.650440] [<ffffffff81ce4356>] ? x86_64_start_reservations+0x131/0x136 [ 85.650446] [<ffffffff81ce7915>] ? xen_start_kernel+0x54e/0x550 [ 85.650451] ---[ end trace ce03efc8ae5a5e98 ]--- [ 85.806018] ------------[ cut here ]------------ [ 85.806044] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860() [ 85.806051] Modules linked in: [ 85.806058] Pid: 2019, comm: postgres Tainted: G W 3.7.0-rc5-20121116-vanilla-warn #1 [ 85.806065] Call Trace: [ 85.806073] [<ffffffff8106750a>] warn_slowpath_common+0x7a/0xb0 [ 85.806080] [<ffffffff81067555>] warn_slowpath_null+0x15/0x20 [ 85.806086] [<ffffffff814b2b6e>] xennet_start_xmit+0x7fe/0x860 [ 85.806103] [<ffffffff816a6169>] dev_hard_start_xmit+0x209/0x460 [ 85.806109] [<ffffffff816c1e56>] sch_direct_xmit+0xf6/0x290 [ 85.806114] [<ffffffff816a6566>] dev_queue_xmit+0x1a6/0x5a0 [ 85.806119] [<ffffffff816a63c0>] ? dev_hard_start_xmit+0x460/0x460 [ 85.806125] [<ffffffff810abab5>] ? trace_softirqs_off+0x85/0x1b0 [ 85.806132] [<ffffffff81740436>] ip_finish_output+0x226/0x530 [ 85.806138] [<ffffffff817402dd>] ? ip_finish_output+0xcd/0x530 [ 85.806143] [<ffffffff81740799>] ip_output+0x59/0xe0 [ 85.806148] [<ffffffff8173f2b8>] ip_local_out+0x28/0x90 [ 85.806153] [<ffffffff8173f86f>] ip_queue_xmit+0x17f/0x4a0 [ 85.806157] [<ffffffff8173f6f0>] ? ip_send_unicast_reply+0x340/0x340 [ 85.806163] [<ffffffff810a1cf7>] ? getnstimeofday+0x47/0xe0 [ 85.806168] [<ffffffff816962c9>] ? __skb_clone+0x29/0x120 [ 85.806174] [<ffffffff81755940>] tcp_transmit_skb+0x400/0x8d0 [ 85.806179] [<ffffffff8175891a>] tcp_write_xmit+0x21a/0xa50 [ 85.806184] [<ffffffff8175917b>] tcp_push_one+0x2b/0x40 [ 85.806190] [<ffffffff81749cdc>] tcp_sendmsg+0x8dc/0xe20 [ 85.806195] [<ffffffff8176fe09>] inet_sendmsg+0xa9/0x100 [ 85.806200] [<ffffffff8176fd60>] ? inet_autobind+0x70/0x70 [ 85.806206] [<ffffffff8168dd12>] sock_sendmsg+0x82/0xb0 [ 85.806211] [<ffffffff8168ddb5>] ? sockfd_lookup_light+0x25/0x80 [ 85.806216] [<ffffffff8168e5e4>] sys_sendto+0x104/0x140 [ 85.806223] [<ffffffff817d26a9>] system_call_fastpath+0x16/0x1b [ 85.806227] ---[ end trace ce03efc8ae5a5e99 ]--- [ 85.806855] ------------[ cut here ]------------ [ 85.806871] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860() [ 85.806879] Modules linked in: [ 85.806884] Pid: 2019, comm: postgres Tainted: G W 3.7.0-rc5-20121116-vanilla-warn #1 [ 85.806891] Call Trace: [ 85.806898] [<ffffffff8106750a>] warn_slowpath_common+0x7a/0xb0 [ 85.806905] [<ffffffff81067555>] warn_slowpath_null+0x15/0x20 [ 85.806911] [<ffffffff814b2b6e>] xennet_start_xmit+0x7fe/0x860 [ 85.806917] [<ffffffff816a6169>] dev_hard_start_xmit+0x209/0x460 [ 85.806923] [<ffffffff816c1e56>] sch_direct_xmit+0xf6/0x290 [ 85.806929] [<ffffffff816a6566>] dev_queue_xmit+0x1a6/0x5a0 [ 85.806935] [<ffffffff816a63c0>] ? dev_hard_start_xmit+0x460/0x460 [ 85.806941] [<ffffffff810b25e7>] ? lock_release+0x117/0x250 [ 85.806947] [<ffffffff81740436>] ip_finish_output+0x226/0x530 [ 85.806953] [<ffffffff817402dd>] ? ip_finish_output+0xcd/0x530 [ 85.806959] [<ffffffff81740799>] ip_output+0x59/0xe0 [ 85.806964] [<ffffffff8173f2b8>] ip_local_out+0x28/0x90 [ 85.806970] [<ffffffff8173f86f>] ip_queue_xmit+0x17f/0x4a0 [ 85.806975] [<ffffffff8173f6f0>] ? ip_send_unicast_reply+0x340/0x340 [ 85.806982] [<ffffffff810a1cf7>] ? getnstimeofday+0x47/0xe0 [ 85.806987] [<ffffffff816962c9>] ? __skb_clone+0x29/0x120 [ 85.806993] [<ffffffff81755940>] tcp_transmit_skb+0x400/0x8d0 [ 85.806999] [<ffffffff81758026>] tcp_retransmit_skb+0x1c6/0x5a0 [ 85.807005] [<ffffffff81094806>] ? finish_task_switch+0x46/0xe0 [ 85.807011] [<ffffffff8175859e>] tcp_xmit_retransmit_queue+0x19e/0x300 [ 85.807018] [<ffffffff8175070b>] tcp_fastretrans_alert+0x76b/0xcb0 [ 85.807024] [<ffffffff817515fc>] tcp_ack+0x9ac/0x1150 [ 85.807030] [<ffffffff81752663>] ? tcp_validate_incoming+0x2d3/0x350 [ 85.807036] [<ffffffff81754778>] tcp_rcv_established+0x318/0x640 [ 85.807042] [<ffffffff8106f776>] ? local_bh_enable+0xc6/0x160 [ 85.807048] [<ffffffff8175c3a5>] tcp_v4_do_rcv+0x135/0x480 [ 85.807054] [<ffffffff8106f08f>] ? __local_bh_disable+0x8f/0xe0 [ 85.807061] [<ffffffff817483db>] tcp_prequeue_process+0x6b/0xa0 [ 85.807067] [<ffffffff81748e40>] tcp_recvmsg+0x8f0/0xb70 [ 85.807072] [<ffffffff810b25e7>] ? lock_release+0x117/0x250 [ 85.807078] [<ffffffff8176ec2a>] inet_recvmsg+0xba/0x100 [ 85.807084] [<ffffffff8176fd60>] ? inet_autobind+0x70/0x70 [ 85.807090] [<ffffffff8168dbf9>] sock_recvmsg+0x89/0xc0 [ 85.807096] [<ffffffff81116b0f>] ? tlb_flush_mmu+0x5f/0xa0 [ 85.807102] [<ffffffff810b171b>] ? __lock_acquire+0x46b/0xdd0 [ 85.807108] [<ffffffff8168ddb5>] ? sockfd_lookup_light+0x25/0x80 [ 85.807114] [<ffffffff8168e45f>] sys_recvfrom+0xbf/0x120 [ 85.807120] [<ffffffff811144db>] ? might_fault+0x3b/0x90 [ 85.807126] [<ffffffff810b25e7>] ? lock_release+0x117/0x250 [ 85.807133] [<ffffffff817d26a9>] system_call_fastpath+0x16/0x1b [ 85.807138] ---[ end trace ce03efc8ae5a5e9a ]--- [ 85.807159] ------------[ cut here ]------------ [ 85.807165] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860() [ 85.807171] Modules linked in: [ 85.807176] Pid: 2019, comm: postgres Tainted: G W 3.7.0-rc5-20121116-vanilla-warn #1 [ 85.807182] Call Trace: [ 85.807187] [<ffffffff8106750a>] warn_slowpath_common+0x7a/0xb0 [ 85.807193] [<ffffffff81067555>] warn_slowpath_null+0x15/0x20 [ 85.807199] [<ffffffff814b2b6e>] xennet_start_xmit+0x7fe/0x860 [ 85.807205] [<ffffffff816a6169>] dev_hard_start_xmit+0x209/0x460 [ 85.807211] [<ffffffff816c1e56>] sch_direct_xmit+0xf6/0x290 [ 85.807216] [<ffffffff816a6566>] dev_queue_xmit+0x1a6/0x5a0 [ 85.807222] [<ffffffff816a63c0>] ? dev_hard_start_xmit+0x460/0x460 [ 85.807228] [<ffffffff810b25e7>] ? lock_release+0x117/0x250 [ 85.807233] [<ffffffff81740436>] ip_finish_output+0x226/0x530 [ 85.807239] [<ffffffff817402dd>] ? ip_finish_output+0xcd/0x530 [ 85.807245] [<ffffffff81740799>] ip_output+0x59/0xe0 [ 85.807250] [<ffffffff8173f2b8>] ip_local_out+0x28/0x90 [ 85.807256] [<ffffffff8173f86f>] ip_queue_xmit+0x17f/0x4a0 [ 85.807261] [<ffffffff8173f6f0>] ? ip_send_unicast_reply+0x340/0x340 [ 85.807267] [<ffffffff810a1cf7>] ? getnstimeofday+0x47/0xe0 [ 85.807272] [<ffffffff816962c9>] ? __skb_clone+0x29/0x120 [ 85.807278] [<ffffffff81755940>] tcp_transmit_skb+0x400/0x8d0 [ 85.807283] [<ffffffff81758026>] tcp_retransmit_skb+0x1c6/0x5a0 [ 85.810124] [<ffffffff81094806>] ? finish_task_switch+0x46/0xe0 [ 85.810124] [<ffffffff8175859e>] tcp_xmit_retransmit_queue+0x19e/0x300 [ 85.810124] [<ffffffff8175070b>] tcp_fastretrans_alert+0x76b/0xcb0 [ 85.810124] [<ffffffff817515fc>] tcp_ack+0x9ac/0x1150 [ 85.810124] [<ffffffff81752663>] ? tcp_validate_incoming+0x2d3/0x350 [ 85.810124] [<ffffffff81754778>] tcp_rcv_established+0x318/0x640 [ 85.810124] [<ffffffff8106f776>] ? local_bh_enable+0xc6/0x160 [ 85.810124] [<ffffffff8175c3a5>] tcp_v4_do_rcv+0x135/0x480 [ 85.810124] [<ffffffff8106f08f>] ? __local_bh_disable+0x8f/0xe0 [ 85.810124] [<ffffffff817483db>] tcp_prequeue_process+0x6b/0xa0 [ 85.810124] [<ffffffff81748e40>] tcp_recvmsg+0x8f0/0xb70 [ 85.810124] [<ffffffff810b25e7>] ? lock_release+0x117/0x250 [ 85.810124] [<ffffffff8176ec2a>] inet_recvmsg+0xba/0x100 [ 85.810124] [<ffffffff8176fd60>] ? inet_autobind+0x70/0x70 [ 85.810124] [<ffffffff8168dbf9>] sock_recvmsg+0x89/0xc0 [ 85.810124] [<ffffffff81116b0f>] ? tlb_flush_mmu+0x5f/0xa0 [ 85.8 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel

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