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Date: Mon, 25 Aug 2014 10:25:57 -0400 From: Vlad Yasevich <vyasevich@...il.com> To: Brian Rak <brak@...eservers.com>, netdev@...r.kernel.org Subject: Re: skb_warn_bad_offload warnings with FreeBSD guests On 08/22/2014 12:19 PM, Brian Rak wrote: > We have a number of machines running qemu with bridged networking. We have noticed that > *sometimes* FreeBSD guests cause this warning to flood the host "WARNING: CPU: 5 PID: 3705 > at net/core/dev.c:2238 skb_warn_bad_offload+0xc3/0xd0()". I haven't been able to come up > with any sort of reproduction steps, it just seems to happen to some FreeBSD guests, but > not others. > > A full stack trace looks like this: > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 7147 at net/core/dev.c:2233 skb_warn_bad_offload+0xc3/0xd0() > igb: caps=(0x0000000190114bb3, 0x0000000000000000) len=2962 data_len=0 gso_size=1448 > gso_type=5 ip_summed=0 > Modules linked in: dm_snapshot dm_bufio ipmi_devintf xt_physdev ebt_arp ebt_ip ebtable_nat > ebtables cls_fw sch_sfq sch_htb tun kvm_intel kvm 8021q garp nfnetlink_queue nfnetlink_log > nfnetlink bluetooth rfkill bridge stp llc xt_CHECKSUM iptable_mangle ipt_REJECT > iptable_filter ip > _tables ip6t_REJECT ip6table_filter ip6_tables ipv6 iTCO_wdt iTCO_vendor_support ipmi_si > ipmi_msghandler microcode pcspkr i2c_i801 joydev sg lpc_ich shpchp igb dca ptp pps_core > hwmon ext4 jbd2 mbcache sd_mod crc_t10dif crct10dif_common video ahci libahci xhci_hcd ast > ttm drm_kms > _helper sysimgblt sysfillrect syscopyarea dm_mirror dm_region_hash dm_log dm_mod > CPU: 1 PID: 7147 Comm: qemu-kvm Tainted: G W 3.15.5-1.el6.elrepo.x86_64 #1 > Hardware name: Supermicro X10SLE-F/HF/X10SLE, BIOS 1.1 07/19/2013 > 00000000000008b9 ffff88081fc435d8 ffffffff8163ba90 00000000000008b9 > ffff88081fc43628 ffff88081fc43618 ffffffff8106c30c ffffc90007a06e30 > 0000000000000000 ffff8807f2b64000 ffff8807f2b64000 0000000000000000 > Call Trace: > <IRQ> [<ffffffff8163ba90>] dump_stack+0x49/0x61 > [<ffffffff8106c30c>] warn_slowpath_common+0x8c/0xc0 > [<ffffffff8106c3f6>] warn_slowpath_fmt+0x46/0x50 > [<ffffffff8156ce93>] skb_warn_bad_offload+0xc3/0xd0 > [<ffffffff81574a29>] ? dev_hard_start_xmit+0x339/0x640 > [<ffffffff81574699>] __skb_gso_segment+0x89/0xe0 > [<ffffffff81574876>] dev_hard_start_xmit+0x186/0x640 > [<ffffffff81594f5a>] sch_direct_xmit+0xfa/0x1d0 > [<ffffffff81574f2f>] __dev_queue_xmit+0x1ff/0x4f0 > [<ffffffff81575240>] dev_queue_xmit+0x10/0x20 > [<ffffffffa02e6612>] br_dev_queue_push_xmit+0x82/0xb0 [bridge] > [<ffffffffa02ee680>] br_nf_dev_queue_xmit+0x20/0x90 [bridge] > [<ffffffffa02ef4b8>] br_nf_post_routing+0x2d8/0x300 [bridge] > [<ffffffffa02e6590>] ? deliver_clone+0x60/0x60 [bridge] > [<ffffffff815a357e>] nf_iterate+0x8e/0xc0 > [<ffffffffa02e6590>] ? deliver_clone+0x60/0x60 [bridge] > [<ffffffff815a37ad>] nf_hook_slow+0x7d/0x150 > [<ffffffffa02e6590>] ? deliver_clone+0x60/0x60 [bridge] > [<ffffffffa02ee6f0>] ? br_nf_dev_queue_xmit+0x90/0x90 [bridge] > [<ffffffffa02e6b43>] br_forward_finish+0x43/0x60 [bridge] > [<ffffffffa02ee8a8>] br_nf_forward_finish+0x1b8/0x1d0 [bridge] > [<ffffffffa02ef178>] br_nf_forward_ip+0x3a8/0x410 [bridge] > [<ffffffffa02e6b00>] ? br_flood_deliver+0x20/0x20 [bridge] > [<ffffffff815a357e>] nf_iterate+0x8e/0xc0 > [<ffffffffa02e6b00>] ? br_flood_deliver+0x20/0x20 [bridge] > [<ffffffff815a37ad>] nf_hook_slow+0x7d/0x150 > [<ffffffffa02e6b00>] ? br_flood_deliver+0x20/0x20 [bridge] > [<ffffffffa02e66e4>] __br_forward+0xa4/0x100 [bridge] > [<ffffffffa02e7800>] ? NF_HOOK.clone.0+0x70/0x70 [bridge] > [<ffffffffa02e67d6>] br_forward+0x96/0xb0 [bridge] > [<ffffffffa02e7800>] ? NF_HOOK.clone.0+0x70/0x70 [bridge] > [<ffffffffa02e7997>] br_handle_frame_finish+0x197/0x3f0 [bridge] > [<ffffffffa02e7800>] ? NF_HOOK.clone.0+0x70/0x70 [bridge] > [<ffffffffa02ef790>] br_nf_pre_routing_finish+0x2b0/0x370 [bridge] > [<ffffffffa02ef4e0>] ? br_nf_post_routing+0x300/0x300 [bridge] > [<ffffffffa02ed986>] NF_HOOK_THRESH+0x56/0x60 [bridge] > [<ffffffffa02eed2b>] br_nf_pre_routing+0x2fb/0x3a0 [bridge] > [<ffffffff815a357e>] nf_iterate+0x8e/0xc0 > [<ffffffffa02e7800>] ? NF_HOOK.clone.0+0x70/0x70 [bridge] > [<ffffffff815a37ad>] nf_hook_slow+0x7d/0x150 > [<ffffffffa02e7800>] ? NF_HOOK.clone.0+0x70/0x70 [bridge] > [<ffffffffa02e7d8c>] br_handle_frame+0x19c/0x240 [bridge] > [<ffffffffa02e7bf0>] ? br_handle_frame_finish+0x3f0/0x3f0 [bridge] > [<ffffffff81572fa5>] __netif_receive_skb_core+0x1e5/0x620 > [<ffffffff81573407>] __netif_receive_skb+0x27/0x70 > [<ffffffff81573553>] process_backlog+0x103/0x200 > [<ffffffff81573d62>] net_rx_action+0x112/0x2a0 > [<ffffffff8107111c>] __do_softirq+0xfc/0x2b0 > [<ffffffff810713cd>] ? irq_exit+0xad/0xd0 > [<ffffffff8164a81c>] do_softirq_own_stack+0x1c/0x30 > <EOI> [<ffffffff81070e75>] do_softirq+0x55/0x60 > [<ffffffff81571e19>] netif_rx_ni+0x39/0x70 > [<ffffffffa03e84e0>] tun_get_user+0x310/0x6c0 [tun] > [<ffffffffa03e8995>] tun_chr_aio_write+0x85/0xa0 [tun] > [<ffffffff811beb9d>] do_sync_readv_writev+0x4d/0x80 > [<ffffffff811c0128>] do_readv_writev+0xc8/0x2c0 > [<ffffffff811bebd0>] ? do_sync_readv_writev+0x80/0x80 > [<ffffffff811d2c45>] ? poll_select_set_timeout+0x95/0xb0 > [<ffffffff811c0357>] vfs_writev+0x37/0x50 > [<ffffffff811c0496>] SyS_writev+0x56/0xf0 > [<ffffffff81648ee9>] system_call_fastpath+0x16/0x1b > ---[ end trace d26e70ba037ab631 ]--- > > > gso_type=5 and ip_summed=0 are always the same (though len, data_len, and gso_size vary). > > What is causing this? The reason that the warning is triggered is ip_summed = 0 which means there is not checksum already in the packet and it needs to be calculated. If the packet is GSO, then it needs to have partial checksum set (ip_summed == 3). You might try using systemtap or instrumenting tun and bridge to see what the ip_summed value is when this happens. -vlad > I've tried kernels as new as 3.15.5-1, which do not appear to help. > > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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