Re: Regression in skge that started around acb42a3 (so past v3.3-rc1)
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From: Konrad Rzeszutek Wilk <hidden>
Date: 2012-01-30 18:00:19
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On Mon, Jan 30, 2012 at 08:38:43AM -0800, Stephen Hemminger wrote:
On Mon, 30 Jan 2012 10:58:16 -0500 Konrad Rzeszutek Wilk [off-list ref] wrote:quoted
I hadn't done any git bisection yet, but with acb42a3 I started getting this: (and only on i686 - x86_64 does not show these): (This is with Xen, the other one is without) [ 28.602121] eth2: no IPv6 routers present [ 70.457712] eth2: hw csum failure. [ 70.458695] Pid: 0, comm: swapper/0 Not tainted 3.3.0-rc1-00287-gacb42a3 #1 [ 70. [ 70.458695] [<c140942b>] __skb_checksum_complete+0xb/0x10 [ 70.458695] [<c148e3b0>] nf_ip_checksum+0x60/0x120 [ 70.458695] [<c143ee6b>] udp_error+0xbb/0x1f0 [ 70.458695] [<c103c1e4>] ? check_events+0x8/0xc [ 70.458695] [<c103c1db>] ? xen_restore_fl_direct_reloc+0x4/0x4 [ 70.458695] [<c11497ee>] ? put_cpu_partial+0x9e/0xb0 [ 70.458695] [<c143edb0>] ? udp_pkt_to_tuple+0x60/0x60 [ 70.458695] [<c143a2b6>] nf_conntrack_in+0xc6/0x5c0 [ 70.458695] [<c14751f8>] ? __udp4_lib_rcv+0x428/0x630 [ 70.458695] [<c1149dd0>] ? kfree+0xf0/0x120 [ 70.458695] [<c1405b60>] ? skb_release_data+0x90/0xb0 [ 70.458695] [<c1405b60>] ? skb_release_data+0x90/0xb0 [ 70.458695] [<c14057d8>] ? __kfree_skb+0x38/0x90 [ 70.458695] [<c144d510>] ? inet_del_protocol+0x30/0x30 [ 70.458695] [<c148f41e>] ipv4_conntrack_in+0x1e/0x30 [ 70.458695] [<c14360d3>] nf_iterate+0x63/0x90 [ 70.458695] [<c144d510>] ? inet_del_protocol+0x30/0x30 [ 70.458695] [<c1436292>] nf_hook_slow+0x62/0x140 [ 70.458695] [<c144d510>] ? inet_del_protocol+0x30/0x30 [ 70.458695] [<c144dbb5>] ip_rcv+0x235/0x310 [ 70.458695] [<c144d510>] ? inet_del_protocol+0x30/0x30 [ 70.458695] [<c1412c36>] __netif_receive_skb+0x1d6/0x550 [ 70.458695] [<c147c6a9>] ? inet_gro_receive+0x59/0x1f0 [ 70.458695] [<c1413312>] netif_receive_skb+0x22/0x90 [ 70.458695] [<c1413487>] napi_skb_finish+0x37/0x50 [ 70.458695] [<c14139e3>] napi_gro_receive+0xe3/0xf0 [ 70.458695] [<c12ff4c0>] ? xen_swiotlb_map_sg+0x20/0x20 [ 70.458695] [<c12ff4d9>] ? xen_swiotlb_unmap_page+0x19/0x20 [ 70.458695] [<f7983d6c>] skge_poll+0x34c/0x6f4 [skge] [ 70.458695] [<c141431a>] net_rx_action+0xfa/0x2a0 [ 70.458695] [<c107cecf>] __do_softirq+0x9f/0x210 [ 70.458695] [<c107ce30>] ? irq_exit+0xd0/0xd0 [ 70.458695] <IRQ> [<c107ce15>] ? irq_exit+0xb5/0xd0The skge driver uses hardware receive checksum where it computes the sum of the packet (but does not check it). This kind of problem happens when some part of the call chain above it updates the packet but does not update the checksum. A fix like the following is presumably needed for some part of this path.
Ah, so you are saying that the problem above is already fixed in 3.3-rc1. OK, so what about the other one that I mentioned in the email: [ 288.735236] IP: [<c127b1aa>] memcpy+0x1a/0x0a4f001 *pde = 0000000000000000 [ 288.735236] Oops: 0000 [#1] PREEMPT SMP [ 288.751724] Modules linked in: dm_multipath dm_mod iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi libcrc32c crc32c sg sd_mod ata_generic sata_nv nouveau fbcon tileblit font bitblit e1000 softcursor ttm libata skge drm_kms_helper mxm_wmi video wmi scsi_mod [last unloaded: dump_dma] [ 288.751724] [ 288.751724] Pid: 0, comm: swapper/0 Tainted: G O 3.3.0-rc1-00383-g0a96265 #1 BIOSTAR Group N61PB-M2S/N61PB-M2S [ 288.751724] EIP: 0060:[<c127b1aa>] EFLAGS: 00010217 CPU: 0 [ 288.751724] EIP is at memcpy+0x1a/0x40 [ 288.751724] EAX: f0a11040 EBX: 00000062 ECX: 00000018 EDX: 00000000 [ 288.751724] ESI: 00000000 EDI: f0a11040 EBP: f100bf2c ESP: f100bf20 [ 288.751724] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 288.751724] Process swapper/0 (pid: 0, ti=f100a000 task=c16b1020 task.ti=c16aa000) [ 288.751724] Stack: [ 288.751724] f1297c00 f1086144 f762dd80 f100bf88 f8449ccb 39e70110 00000043 39e70110 [ 288.751724] 00000043 00000000 c176b140 00000002 f100bf98 f0991d80 f1297c00 f11c4060 [ 288.751724] ffff0000 00000040 f1297c08 f1297800 00000000 00000000 00000062 f1297c08 [ 288.751724] Call Trace: [ 288.751724] [<f8449ccb>] skge_poll+0x2ab/0x6f4 [skge] [ 288.751724] [<c1413dba>] net_rx_action+0xfa/0x2a0 [ 288.751724] [<c107cecf>] __do_softirq+0x9f/0x210 [ 288.751724] [<c107ce30>] ? irq_exit+0xd0/0xd0 [ 288.751724] <IRQ> [ 288.751724] [<c107ce15>] ? irq_exit+0xb5/0xd0 [ 288.751724] [<c1045e06>] ? do_IRQ+0x46/0xb0 [ 288.751724] [<c107cdc1>] ? irq_exit+0x61/0xd0 [ 288.751724] [<c105fb23>] ? smp_apic_timer_interrupt+0x53/0x90 [ 288.751724] [<c153abb0>] ? common_interrupt+0x30/0x38 [ 288.751724] [<c10685f5>] ? native_safe_halt+0x5/0x10 [ 288.751724] [<c104c53d>] ? default_idle+0xfd/0x200 [ 288.751724] [<c104c68c>] ? amd_e400_idle+0x4c/0x100 [ 288.751724] [<c1043fd8>] ? cpu_idle+0xa8/0xf0 [ 288.751724] [<c151602b>] ? rest_init+0x7b/0x80 [ 288.751724] [<c16f686d>] ? start_kernel+0x348/0x34e [ 288.751724] [<c16f634f>] ? kernel_init+0x149/0x149 [ 288.751724] [<c16f60ba>] ? i386_start_kernel+0xa9/0xb0 [ 288.751724] Code: c6 43 4c 04 88 43 4d 8b 1c 24 89 ec 5d c3 90 90 90 55 89 e5 83 ec 0c 89 1c 24 89 cb 89 74 24 04 c1 e9 02 89 d6 89 7c 24 08 89 c7 <f3> a5 89 d9 83 e1 03 74 02 f3 a4 8b 1c 24 8b 74 24 04 8b 7c 24 [ 288.751724] EIP: [<c127b1aa>] memcpy+0x1a/0x40 SS:ESP 0068:f100bf20 [ 288.751724] CR2: 0000000000000000 [ 288.972094] ---[ end trace dca3e5f32515fe5d ]--- [ 288.976724] Kernel panic - not syncing: Fatal exception in interrupt [ 288.983094] panic occurred, switching back to text console
commit fa2da8cdae1dd64f78fc915ca1d1a4a93c71e7cb
Author: stephen hemminger [off-list ref]
Date: Tue Nov 15 08:09:14 2011 +0000
bridge: correct IPv6 checksum after pull
Bridge multicast snooping of ICMPv6 would incorrectly report a checksum prob
when used with Ethernet devices like sky2 that use CHECKSUM_COMPLETE.
When bytes are removed from skb, the computed checksum needs to be adjusted.
Signed-off-by: Stephen Hemminger [off-list ref]
Tested-by: Martin Volf [off-list ref]
Signed-off-by: David S. Miller [off-list ref]