Public bug reported:
Got this warning a few days after upgrading my Ubuntu 16.04.3 LTS server
from 4.4 to 4.10.0-33 (linux-hwe), and applying "bbr" as congestion
control.
I'm using the following non-default kernel parameters:
net.core.somaxconn = 512
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_mtu_probing = 1
net.core.rmem_max = 67108864
net.core.wmem_max = 67108864
net.ipv4.tcp_rmem = 4096 87380 33554432
net.ipv4.tcp_wmem = 4096 65536 33554432
NIC: HP CN1000E 10GbE
Warning in kernel ring buffer:
[200448.082342] ------------[ cut here ]------------
[200448.082360] WARNING: CPU: 0 PID: 0 at
/build/linux-hwe-YA6IuF/linux-hwe-4.10.0/net/ipv4/tcp_input.c:2241
tcp_mark_head_lost+0x1da/0x2d0
[200448.082362] Modules linked in: binfmt_misc ses enclosure bonding intel_rapl
sb_edac ipmi_ssif edac_core x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm
irqbypass mei_me cdc_ether shpchp usbnet intel_cstate intel_rapl_perf mii mei
ipmi_si input_leds joydev ipmi_devintf ipmi_msghandler lpc_ich mac_hid
acpi_power_meter acpi_pad sch_fq tcp_bbr ib_iser rdma_cm iw_cm ib_cm ib_core
configfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi coretemp autofs4
btrfs raid10 raid1 raid0 multipath linear raid456 async_raid6_recov
async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c mgag200
i2c_algo_bit ttm crct10dif_pclmul crc32_pclmul drm_kms_helper
ghash_clmulni_intel syscopyarea pcbc mpt3sas hid_generic sysfillrect sysimgblt
aesni_intel fb_sys_fops tg3 raid_class usbhid aes_x86_64 lpfc crypto_simd
[200448.082411] glue_helper ptp scsi_transport_sas megaraid_sas drm hid be2net
scsi_transport_fc cryptd pps_core wmi fjes
[200448.082420] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.10.0-33-generic
#37~16.04.1-Ubuntu
[200448.082421] Hardware name: Google Inc Google Search Appliance/0JP31P, BIOS
2.5.4 01/22/2016
[200448.082423] Call Trace:
[200448.082424] <IRQ>
[200448.082429] dump_stack+0x63/0x90
[200448.082431] __warn+0xcb/0xf0
[200448.082433] warn_slowpath_null+0x1d/0x20
[200448.082434] tcp_mark_head_lost+0x1da/0x2d0
[200448.082436] tcp_update_scoreboard+0x68/0x70
[200448.082438] tcp_fastretrans_alert+0x72c/0xb20
[200448.082439] tcp_ack+0x4d8/0xa60
[200448.082441] tcp_rcv_established+0x1bc/0x700
[200448.082444] ? sk_filter_trim_cap+0x47/0x170
[200448.082446] tcp_v4_do_rcv+0x145/0x200
[200448.082447] tcp_v4_rcv+0x9bb/0xa40
[200448.082450] ? tcp_v6_rcv+0x8e3/0x960
[200448.082452] ip_local_deliver_finish+0x94/0x1e0
[200448.082453] ip_local_deliver+0x6f/0xe0
[200448.082455] ? tcp_v4_early_demux+0x13a/0x150
[200448.082456] ip_rcv_finish+0x11b/0x400
[200448.082457] ip_rcv+0x28b/0x3a0
[200448.082461] __netif_receive_skb_core+0x51e/0xa70
[200448.082463] ? free_compound_page+0x1b/0x20
[200448.082465] ? __put_compound_page+0x2b/0x30
[200448.082467] __netif_receive_skb+0x18/0x60
[200448.082468] netif_receive_skb_internal+0x32/0xa0
[200448.082470] napi_gro_frags+0xdb/0x210
[200448.082476] be_process_rx+0x2f3/0x990 [be2net]
[200448.082478] ? consume_skb+0x34/0x90
[200448.082482] be_poll+0x1f2/0x490 [be2net]
[200448.082484] net_rx_action+0x23e/0x390
[200448.082486] __do_softirq+0xed/0x297
[200448.082488] irq_exit+0xb6/0xc0
[200448.082489] do_IRQ+0x4f/0xd0
[200448.082492] common_interrupt+0x89/0x89
[200448.082494] RIP: 0010:poll_idle+0x2e/0x5c
[200448.082495] RSP: 0018:ffffffff91c03dd0 EFLAGS: 00000246 ORIG_RAX:
ffffffffffffff47
[200448.082499] RAX: 0000000000200000 RBX: 0000000000000000 RCX:
ffffffff91c10500
[200448.082499] RDX: 0000000000000000 RSI: ffffffff91ce71a0 RDI:
ffff932d4f822c30
[200448.082500] RBP: ffffffff91c03dd0 R08: 0000000000000001 R09:
0000000000000006
[200448.082501] R10: 000000000000000f R11: 000000000000002c R12:
ffffffff91ce71a0
[200448.082502] R13: ffff932d4f822c30 R14: ffffffff91ce71b8 R15:
0000b64e73d8d3b9
[200448.082502] </IRQ>
[200448.082507] cpuidle_enter_state+0xfa/0x2d0
[200448.082508] cpuidle_enter+0x17/0x20
[200448.082511] call_cpuidle+0x23/0x40
[200448.082513] do_idle+0x17f/0x1f0
[200448.082514] cpu_startup_entry+0x71/0x80
[200448.082517] rest_init+0x77/0x80
[200448.082521] start_kernel+0x482/0x4a3
[200448.082523] ? early_idt_handler_array+0x120/0x120
[200448.082524] x86_64_start_reservations+0x24/0x26
[200448.082526] x86_64_start_kernel+0x143/0x166
[200448.082528] start_cpu+0x14/0x14
[200448.082531] ---[ end trace bbcdea131d7e5d8d ]---
[200448.082539] ------------[ cut here ]------------
Followed by 15 similar warnings.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.10.0-33-generic 4.10.0-33.37~16.04.1
ProcVersionSignature: Ubuntu 4.10.0-33.37~16.04.1-generic 4.10.17
Uname: Linux 4.10.0-33-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Sun Sep 10 09:58:23 2017
InstallationDate: Installed on 2017-07-16 (55 days ago)
InstallationMedia: Ubuntu-Server 16.04.2 LTS "Xenial Xerus" - Release amd64
(20170215.8)
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-hwe (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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https://bugs.launchpad.net/bugs/1716207
Title:
WARNING: CPU: 0 PID: 0 at linux-hwe-4.10.0/net/ipv4/tcp_input.c:2241
tcp_mark_head_lost+0x1da/0x2d0
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