Subject: Fw: [Bug 201423] New: eth0: hw csum failure

From: Stephen Hemminger <[email-masked]>
Date: Mon, 15 Oct 2018 08:15:19 -0700

Begin forwarded message:

Date: Sun, 14 Oct 2018 10:42:48 +0000
From: [email-masked]
To: [email-masked]
Subject: [Bug 201423] New: eth0: hw csum failure

https://bugzilla.kernel.org/show_bug.cgi?id=201423

            Bug ID: 201423
           Summary: eth0: hw csum failure
           Product: Networking
           Version: 2.5
    Kernel Version: 4.19.0-rc7
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: [email-masked]
          Reporter: [email-masked]
        Regression: No

I have a P6T DELUXE V2 motherboard and using the sky2 driver for the ethernet
ports. I get the following error message:

[  433.727397] eth0: hw csum failure
[  433.727406] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 4.19.0-rc7 #19
[  433.727406] Hardware name: System manufacturer System Product Name/P6T
DELUXE V2, BIOS 1202    12/22/2010
[  433.727407] Call Trace:
[  433.727409]  <IRQ>
[  433.727415]  dump_stack+0x46/0x5b
[  433.727419]  __skb_checksum_complete+0xb0/0xc0
[  433.727423]  tcp_v4_rcv+0x528/0xb60
[  433.727426]  ? ipt_do_table+0x2d0/0x400
[  433.727429]  ip_local_deliver_finish+0x5a/0x110
[  433.727430]  ip_local_deliver+0xe1/0xf0
[  433.727431]  ? ip_sublist_rcv_finish+0x60/0x60
[  433.727432]  ip_rcv+0xca/0xe0
[  433.727434]  ? ip_rcv_finish_core.isra.0+0x300/0x300
[  433.727436]  __netif_receive_skb_one_core+0x4b/0x70
[  433.727438]  netif_receive_skb_internal+0x4e/0x130
[  433.727439]  napi_gro_receive+0x6a/0x80
[  433.727442]  sky2_poll+0x707/0xd20
[  433.727446]  ? rcu_check_callbacks+0x1b4/0x900
[  433.727447]  net_rx_action+0x237/0x380
[  433.727449]  __do_softirq+0xdc/0x1e0
[  433.727452]  irq_exit+0xa9/0xb0
[  433.727453]  do_IRQ+0x45/0xc0
[  433.727455]  common_interrupt+0xf/0xf
[  433.727456]  </IRQ>
[  433.727459] RIP: 0010:cpuidle_enter_state+0x124/0x200
[  433.727461] Code: 53 60 89 c3 e8 dd 90 ad ff 65 8b 3d 96 58 a7 7e e8 d1 8f
ad ff 31 ff 49 89 c4 e8 27 99 ad ff fb 48 ba cf f7 53 e3 a5 9b c4 20 <4c> 89 e1
4c 29 e9 48 89 c8 48 c1 f9 3f 48 f7 ea b8 ff ff ff 7f 48
[  433.727462] RSP: 0000:ffffc900000a3e98 EFLAGS: 00000282 ORIG_RAX:
ffffffffffffffde
[  433.727463] RAX: ffff880237b1f280 RBX: 0000000000000004 RCX:
000000000000001f
[  433.727464] RDX: 20c49ba5e353f7cf RSI: 000000002fe419c1 RDI:
0000000000000000
[  433.727465] RBP: ffff880237b263a0 R08: 0000000000000714 R09:
000000650512105d
[  433.727465] R10: 00000000ffffffff R11: 0000000000000342 R12:
00000064fc2a8b1c
[  433.727466] R13: 00000064fc25b35f R14: 0000000000000004 R15:
ffffffff8204af20
[  433.727468]  ? cpuidle_enter_state+0x119/0x200
[  433.727471]  do_idle+0x1bf/0x200
[  433.727473]  cpu_startup_entry+0x6a/0x70
[  433.727475]  start_secondary+0x17f/0x1c0
[  433.727476]  secondary_startup_64+0xa4/0xb0
[  441.662954] eth0: hw csum failure
[  441.662959] CPU: 4 PID: 4347 Comm: radeon_cs:0 Not tainted 4.19.0-rc7 #19
[  441.662960] Hardware name: System manufacturer System Product Name/P6T
DELUXE V2, BIOS 1202    12/22/2010
[  441.662960] Call Trace:
[  441.662963]  <IRQ>
[  441.662968]  dump_stack+0x46/0x5b
[  441.662972]  __skb_checksum_complete+0xb0/0xc0
[  441.662975]  tcp_v4_rcv+0x528/0xb60
[  441.662979]  ? ipt_do_table+0x2d0/0x400
[  441.662981]  ip_local_deliver_finish+0x5a/0x110
[  441.662983]  ip_local_deliver+0xe1/0xf0
[  441.662985]  ? ip_sublist_rcv_finish+0x60/0x60
[  441.662986]  ip_rcv+0xca/0xe0
[  441.662988]  ? ip_rcv_finish_core.isra.0+0x300/0x300
[  441.662990]  __netif_receive_skb_one_core+0x4b/0x70
[  441.662993]  netif_receive_skb_internal+0x4e/0x130
[  441.662994]  napi_gro_receive+0x6a/0x80
[  441.662998]  sky2_poll+0x707/0xd20
[  441.663000]  net_rx_action+0x237/0x380
[  441.663002]  __do_softirq+0xdc/0x1e0
[  441.663005]  irq_exit+0xa9/0xb0
[  441.663007]  do_IRQ+0x45/0xc0
[  441.663009]  common_interrupt+0xf/0xf
[  441.663010]  </IRQ>
[  441.663012] RIP: 0010:merge+0x22/0xb0
[  441.663014] Code: c3 31 c0 c3 90 90 90 90 41 56 41 55 41 54 55 48 89 d5 53
48 89 cb 48 83 ec 18 65 48 8b 04 25 28 00 00 00 48 89 44 24 10 31 c0 <48> 85 c9
74 70 48 85 d2 74 6b 49 89 fd 49 89 f6 49 89 e4 eb 14 48
[  441.663015] RSP: 0018:ffffc9000090b988 EFLAGS: 00000246 ORIG_RAX:
ffffffffffffffde
[  441.663017] RAX: 0000000000000000 RBX: ffff88021ab2d408 RCX:
ffff88021ab2d408
[  441.663018] RDX: ffff88021ab2d388 RSI: ffffffffa021c440 RDI:
0000000000000000
[  441.663019] RBP: ffff88021ab2d388 R08: 0000000000005ecf R09:
0000000000008500
[  441.663020] R10: ffffea000877ec00 R11: ffff880236803500 R12:
ffffffffa021c440
[  441.663021] R13: ffff88021ab2d448 R14: 0000000000000004 R15:
ffffc9000090b9e0
[  441.663048]  ? radeon_irq_kms_set_irq_n_enabled+0x120/0x120 [radeon]
[  441.663063]  ? radeon_irq_kms_set_irq_n_enabled+0x120/0x120 [radeon]
[  441.663065]  ? merge+0x57/0xb0
[  441.663080]  ? radeon_irq_kms_set_irq_n_enabled+0x120/0x120 [radeon]
[  441.663082]  list_sort+0x8b/0x230
[  441.663094]  radeon_cs_parser_fini+0xdf/0x110 [radeon]
[  441.663110]  radeon_cs_ioctl+0x2a4/0x710 [radeon]
[  441.663113]  ? __switch_to_asm+0x34/0x70
[  441.663114]  ? __switch_to_asm+0x40/0x70
[  441.663130]  ? radeon_cs_parser_init+0x20/0x20 [radeon]
[  441.663141]  drm_ioctl_kernel+0xa3/0xe0 [drm]
[  441.663149]  drm_ioctl+0x2e2/0x380 [drm]
[  441.663164]  ? radeon_cs_parser_init+0x20/0x20 [radeon]
[  441.663168]  ? page_add_new_anon_rmap+0x42/0x70
[  441.663171]  do_vfs_ioctl+0x9a/0x600
[  441.663173]  ksys_ioctl+0x35/0x60
[  441.663175]  __x64_sys_ioctl+0x11/0x20
[  441.663177]  do_syscall_64+0x3d/0xf0
[  441.663179]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  441.663180] RIP: 0033:0x7f9377377f37
[  441.663182] Code: 00 00 00 75 0c 48 c7 c0 ff ff ff ff 48 83 c4 18 c3 e8 ad
db 01 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 10 00 00 00 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d 21 4f 2c 00 f7 d8 64 89 01 48
[  441.663183] RSP: 002b:00007f92c3130d28 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[  441.663185] RAX: ffffffffffffffda RBX: 0000564498327ec0 RCX:
00007f9377377f37
[  441.663186] RDX: 0000564498337ec8 RSI: 00000000c0206466 RDI:
0000000000000010
[  441.663186] RBP: 0000564498337ec8 R08: 0000000000000000 R09:
0000000000000000
[  441.663187] R10: 0000000000000000 R11: 0000000000000246 R12:
00000000c0206466
[  441.663188] R13: 0000000000000010 R14: 0000000000000000 R15:
0000564497a38120
[  462.833418] eth0: hw csum failure
[  462.833428] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 4.19.0-rc7 #19
[  462.833429] Hardware name: System manufacturer System Product Name/P6T
DELUXE V2, BIOS 1202    12/22/2010
[  462.833429] Call Trace:
[  462.833432]  <IRQ>
[  462.833438]  dump_stack+0x46/0x5b
[  462.833442]  __skb_checksum_complete+0xb0/0xc0
[  462.833446]  tcp_v4_rcv+0x528/0xb60
[  462.833449]  ? ipt_do_table+0x2d0/0x400
[  462.833452]  ip_local_deliver_finish+0x5a/0x110
[  462.833454]  ip_local_deliver+0xe1/0xf0
[  462.833455]  ? ip_sublist_rcv_finish+0x60/0x60
[  462.833457]  ip_rcv+0xca/0xe0
[  462.833459]  ? ip_rcv_finish_core.isra.0+0x300/0x300
[  462.833461]  __netif_receive_skb_one_core+0x4b/0x70
[  462.833464]  netif_receive_skb_internal+0x4e/0x130
[  462.833466]  napi_gro_receive+0x6a/0x80
[  462.833469]  sky2_poll+0x707/0xd20
[  462.833471]  net_rx_action+0x237/0x380
[  462.833474]  __do_softirq+0xdc/0x1e0
[  462.833477]  irq_exit+0xa9/0xb0
[  462.833479]  do_IRQ+0x45/0xc0
[  462.833481]  common_interrupt+0xf/0xf
[  462.833482]  </IRQ>
[  462.833486] RIP: 0010:cpuidle_enter_state+0x124/0x200
[  462.833488] Code: 53 60 89 c3 e8 dd 90 ad ff 65 8b 3d 96 58 a7 7e e8 d1 8f
ad ff 31 ff 49 89 c4 e8 27 99 ad ff fb 48 ba cf f7 53 e3 a5 9b c4 20 <4c> 89 e1
4c 29 e9 48 89 c8 48 c1 f9 3f 48 f7 ea b8 ff ff ff 7f 48
[  462.833489] RSP: 0018:ffffc900000a3e98 EFLAGS: 00000282 ORIG_RAX:
ffffffffffffffde
[  462.833491] RAX: ffff880237b1f280 RBX: 0000000000000004 RCX:
000000000000001f
[  462.833492] RDX: 20c49ba5e353f7cf RSI: 000000002fe419c1 RDI:
0000000000000000
[  462.833493] RBP: ffff880237b263a0 R08: 0000000000000000 R09:
0000000000000000
[  462.833494] R10: 00000000ffffffff R11: 0000000000000273 R12:
0000006bc3052131
[  462.833495] R13: 0000006bc2f99f57 R14: 0000000000000004 R15:
ffffffff8204af20
[  462.833498]  ? cpuidle_enter_state+0x119/0x200
[  462.833503]  do_idle+0x1bf/0x200
[  462.833506]  cpu_startup_entry+0x6a/0x70
[  462.833510]  start_secondary+0x17f/0x1c0
[  462.833513]  secondary_startup_64+0xa4/0xb0

Something is changed between 4.17.12 and 4.18, after bisecting the problem I
got the following first bad commit:

commit 88078d98d1bb085d72af8437707279e203524fa5
Author: Eric Dumazet <[email-masked]>
Date:   Wed Apr 18 11:43:15 2018 -0700

    net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends

    After working on IP defragmentation lately, I found that some large
    packets defeat CHECKSUM_COMPLETE optimization because of NIC adding
    zero paddings on the last (small) fragment.

    While removing the padding with pskb_trim_rcsum(), we set skb->ip_summed
    to CHECKSUM_NONE, forcing a full csum validation, even if all prior
    fragments had CHECKSUM_COMPLETE set.

    We can instead compute the checksum of the part we are trimming,
    usually smaller than the part we keep.

    Signed-off-by: Eric Dumazet <[email-masked]>
    Signed-off-by: David S. Miller <[email-masked]>

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