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Subjectwarning messages for net/ipv4/tcp_output.c
Hi,

I get a lot of messages regarding net/ipv4/tcp_output.c in syslog.
The OS works "as expected" (network router/firewall), but these
messages are very frequent when there's enough network traffic. Only
in one case I've seen a system freeze after one week uptime. The last
recorded message was related to net/ipv4/tcp_output.c, but I have not
been able to reproduce it again (kernel panic).

Feb 11 16:53:40 kernel: ------------[ cut here ]------------
Feb 11 16:53:40 kernel: WARNING: CPU: 6 PID: 0 at
net/ipv4/tcp_output.c:915 tcp_wfree.cold+0xc/0x13
Feb 11 16:53:40 kernel: Modules linked in: autofs4 nfnetlink_queue
xt_mac xt_REDIRECT xt_limit xt_nat xt_recent xt_statistic xt_connmark
xt_comment xt_iprange l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel
xt_set xt_NFQUEUE xt_AUDIT ipt_REJECT nf_reject_ipv4 xt_addrtype
bridge stp llc xt_mark xt_TCPMSS xt_hashlimit xt_CT xt_multiport
nfnetlink_log xt_NFLOG nf_log_ipv4 nf_log_common xt_LOG nf_nat_tftp
nf_nat_snmp_basic nf_conntrack_snmp nf_nat_sip nf_nat_pptp
nf_nat_proto_gre nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat_amanda
ts_kmp nf_conntrack_amanda nf_conntrack_sane nf_conntrack_tftp
nf_conntrack_sip nf_conntrack_pptp nf_conntrack_proto_gre
nf_conntrack_netlink nf_conntrack_netbios_ns nf_conntrack_broadcast
nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp pppoe pppox
ppp_generic slhc ip_set_hash_mac ip_set_bitmap_port
Feb 11 16:53:40 kernel: ip_set_hash_net ip_set_hash_ip ip_set
nfnetlink ip6table_filter ip6_tables arptable_filter arp_tables
xt_conntrack iptable_mangle iptable_nat nf_nat_ipv4 nf_nat
nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_raw sch_fq tcp_cdg
tcp_bbr iptable_filter ip_tables bpfilter mlx5_ib ipmi_ssif ib_uverbs
edac_mce_amd kvm_amd kvm ast ttm irqbypass crct10dif_pclmul efi_pstore
ghash_clmulni_intel drm_kms_helper pcspkr efivars ixgbe igb sp5100_tco
mlx5_core drm joydev bnxt_en i2c_algo_bit mdio i2c_piix4 mlxfw ccp dca
i2c_core ipmi_si ipmi_devintf ipmi_msghandler pinctrl_amd pcc_cpufreq
acpi_cpufreq mac_hid efivarfs aesni_intel crypto_simd cryptd
glue_helper aes_x86_64 algif_rng algif_aead algif_hash algif_skcipher
af_alg crc32c_intel crc32_pclmul crc32_generic msdos fat cramfs
overlay squashfs
Feb 11 16:53:40 kernel: loop fuse f2fs xfs nfs lockd grace sunrpc
fscache jfs reiserfs btrfs ext4 mbcache jbd2 multipath linear raid10
raid1 raid0 dm_zero dm_verity reed_solomon dm_thin_pool dm_switch
dm_snapshot dm_raid raid456 md_mod async_raid6_recov async_memcpy
async_pq raid6_pq dm_mirror dm_region_hash dm_log_writes
dm_log_userspace dm_log dm_integrity async_xor async_tx xor dm_flakey
dm_delay dm_crypt dm_cache_smq dm_cache dm_persistent_data libcrc32c
dm_bufio dm_bio_prison dm_mod firewire_core crc_itu_t hid_sunplus
hid_sony hid_samsung hid_pl hid_petalynx hid_monterey hid_microsoft
hid_logitech_dj hid_logitech ff_memless hid_gyration hid_ezkey
hid_cypress hid_chicony hid_cherry hid_belkin hid_apple hid_a4tech
sl811_hcd ohci_hcd uhci_hcd uas usb_storage xhci_plat_hcd
pata_sl82c105 pata_via pata_jmicron
Feb 11 16:53:40 kernel: pata_marvell pata_netcell pata_pdc202xx_old
pata_triflex pata_atiixp pata_opti pata_amd pata_ali pata_it8213
pata_pcmcia pcmcia pcmcia_core pata_ns87415 pata_ns87410
pata_serverworks pata_oldpiix pata_artop pata_it821x pata_optidma
pata_hpt3x2n pata_hpt3x3 pata_hpt37x pata_hpt366 pata_cmd64x pata_efar
pata_sil680 pata_pdc2027x pata_mpiix lpfc nvmet_fc qla2xxx
megaraid_mbox megaraid_mm aacraid sx8 hpsa 3w_9xxx 3w_xxxx 3w_sas
mptsas mptfc scsi_transport_fc atp870u dc395x qla1280 dmx3191d
sym53c8xx gdth initio BusLogic arcmsr aic7xxx aic79xx sr_mod cdrom sg
sd_mod mpt3sas raid_class scsi_transport_sas megaraid megaraid_sas
mptspi mptscsih mptbase scsi_transport_spi pdc_adma sata_inic162x
sata_mv sata_qstor sata_vsc sata_uli sata_sis pata_sis sata_sx4
sata_nv sata_via sata_svw sata_sil24
Feb 11 16:53:40 kernel: sata_sil sata_promise ata_piix ahci libahci
nvme_fc nvme_loop nvmet nvme_rdma rdma_cm iw_cm ib_cm ib_core configfs
ipv6 crc_ccitt nvme_fabrics nvme nvme_core
Feb 11 16:53:40 kernel: CPU: 6 PID: 0 Comm: swapper/6 Not tainted
4.19.97-gentoo-x86_64 #1
Feb 11 16:53:40 kernel: Hardware name: Supermicro AS
-1114S-WTRT/H12SSW-NT, BIOS 1.0b 11/15/2019
Feb 11 16:53:40 kernel: RIP: 0010:tcp_wfree.cold+0xc/0x13
Feb 11 16:53:40 kernel: Code: 9d 04 00 00 00 5b c6 85 9b 04 00 00 00
5d c3 48 c7 c7 70 93 06 b0 e8 f7 f7 94 ff 0f 0b c3 48 c7 c7 70 93 06
b0 e8 e8 f7 94 ff <0f> 0b e9 46 a5 ff ff 48 c7 c7 70 93 06 b0 e8 d5 f7
94 ff 0f 0b b8
Feb 11 16:53:40 kernel: RSP: 0018:ffff9e9c2b183d90 EFLAGS: 00010246
Feb 11 16:53:40 kernel: RAX: 0000000000000024 RBX: ffff9e9bc099cee8
RCX: 0000000000000000
Feb 11 16:53:40 kernel: RDX: 0000000000000000 RSI: 00000000000000f6
RDI: 0000000000000300
Feb 11 16:53:40 kernel: RBP: ffff9e9bbef09980 R08: ffff9e9c2b1968b8
R09: 0000000000000001
Feb 11 16:53:40 kernel: R10: 0000000000000000 R11: 0000000000000001
R12: ffff9e9bc099cee8
Feb 11 16:53:40 kernel: R13: ffff9e9a900100a8 R14: ffff9e9c0155a8c0
R15: 0000000000000026
Feb 11 16:53:40 kernel: FS: 0000000000000000(0000)
GS:ffff9e9c2b180000(0000) knlGS:0000000000000000
Feb 11 16:53:40 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Feb 11 16:53:40 kernel: CR2: 00007f90cb702820 CR3: 00000007d41b2000
CR4: 0000000000340ee0
Feb 11 16:53:40 kernel: Call Trace:
Feb 11 16:53:40 kernel: <IRQ>
Feb 11 16:53:40 kernel: skb_release_head_state+0x64/0xb0
Feb 11 16:53:40 kernel: skb_release_all+0xe/0x30
Feb 11 16:53:40 kernel: consume_skb+0x27/0x80
Feb 11 16:53:40 kernel: bnxt_tx_int+0xd0/0x360 [bnxt_en]
Feb 11 16:53:40 kernel: bnxt_poll+0x20f/0x870 [bnxt_en]
Feb 11 16:53:40 kernel: net_rx_action+0x148/0x3b0
Feb 11 16:53:40 kernel: __do_softirq+0xe8/0x2f1
Feb 11 16:53:40 kernel: irq_exit+0x100/0x110
Feb 11 16:53:40 kernel: do_IRQ+0x81/0xe0
Feb 11 16:53:40 kernel: common_interrupt+0xf/0xf
Feb 11 16:53:40 kernel: </IRQ>
Feb 11 16:53:40 kernel: RIP: 0010:cpuidle_enter_state+0xc3/0x320
Feb 11 16:53:40 kernel: Code: e8 82 68 a0 ff 80 7c 24 0b 00 74 17 9c
58 0f 1f 44 00 00 f6 c4 02 0f 85 30 02 00 00 31 ff e8 84 55 a6 ff fb
66 0f 1f 44 00 00 <48> ba cf f7 53 e3 a5 9b c4 20 4c 29 f5 48 89 e8 48
c1 fd 3f 48 f7
Feb 11 16:53:40 kernel: RSP: 0018:ffffb4440021fe80 EFLAGS: 00000246
ORIG_RAX: ffffffffffffffd6
Feb 11 16:53:40 kernel: RAX: ffff9e9c2b1a2200 RBX: ffff9e9c02dfe800
RCX: 000000000000001f
Feb 11 16:53:40 kernel: RDX: 0000000000000000 RSI: 000000002c234d74
RDI: 0000000000000000
Feb 11 16:53:40 kernel: RBP: 000002de50bf72ea R08: 000002de50bf72ea
R09: 0000000000000035
Feb 11 16:53:40 kernel: R10: 00000000ffffffff R11: ffff9e9c2b1a12e8
R12: 0000000000000002
Feb 11 16:53:40 kernel: R13: ffffffffb03954a0 R14: 000002de4de20c75
R15: ffff9e95044bcc80
Feb 11 16:53:40 kernel: do_idle+0x1dc/0x270
Feb 11 16:53:40 kernel: cpu_startup_entry+0x6f/0x80
Feb 11 16:53:40 kernel: start_secondary+0x1a7/0x200
Feb 11 16:53:40 kernel: secondary_startup_64+0xb6/0xc0
Feb 11 16:53:40 kernel: ---[ end trace 828aa59c66af655f ]---

My distribution is Gentoo. I've reported this to the Gentoo Linux
devs, but unfortunately there hasn't been much progress.

# grep CONFIG_KALLSYMS .config
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y
CONFIG_KALLSYMS_ABSOLUTE_PERCPU=y
CONFIG_KALLSYMS_BASE_RELATIVE=y

# emerge --info
Portage 2.3.84 (python 3.6.9-final-0, default/linux/amd64/17.1,
gcc-9.2.0, glibc-2.29-r7, 4.19.97-gentoo-x86_64 x86_64)
=================================================================
System uname: Linux-4.19.97-gentoo-x86_64-x86_64-AMD_EPYC_7272_12-Core_Processor-with-gentoo-2.6
KiB Mem: 32800832 total, 26904664 free
KiB Swap: 37007292 total, 37007292 free
Timestamp of repository gentoo: Thu, 06 Feb 2020 00:45:01 +0000
Head commit of repository gentoo: e358b025b6215c284de6047b54dca1e9b981126a
sh bash 4.4_p23-r1
ld GNU ld (Gentoo 2.32 p2) 2.32.0
app-shells/bash: 4.4_p23-r1::gentoo
dev-java/java-config: 2.2.0-r4::gentoo
dev-lang/perl: 5.30.1::gentoo
dev-lang/python: 2.7.17::gentoo, 3.6.9::gentoo, 3.7.5-r1::gentoo
dev-util/cmake: 3.14.6::gentoo
sys-apps/baselayout: 2.6-r1::gentoo
sys-apps/openrc: 0.42.1::gentoo
sys-apps/sandbox: 2.13::gentoo
sys-devel/autoconf: 2.69-r5::gentoo
sys-devel/automake: 1.11.6-r3::gentoo, 1.15.1-r2::gentoo,
1.16.1-r1::gentoo
sys-devel/binutils: 2.32-r1::gentoo
sys-devel/gcc: 9.2.0-r2::gentoo
sys-devel/gcc-config: 2.1::gentoo
sys-devel/libtool: 2.4.6-r6::gentoo
sys-devel/make: 4.2.1-r4::gentoo
sys-kernel/linux-headers: 4.19::gentoo (virtual/os-headers)
sys-libs/glibc: 2.29-r7::gentoo
Repositories:

gentoo
location: /var/db/repos/gentoo
sync-type: rsync
sync-uri: rsync://rsync.gentoo.org/gentoo-portage
priority: -1000
sync-rsync-verify-metamanifest: yes
sync-rsync-verify-max-age: 24
sync-rsync-extra-opts:
sync-rsync-verify-jobs: 1

CustomOverlay
location: /usr/local/portage
masters: gentoo

ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="*"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /etc/stunnel/stunnel.conf /usr/lib64/fax
/usr/share/easy-rsa /usr/share/gnupg/qualified.txt
/usr/share/maven-bin-3.6/conf /var/bind /var/spool/fax/etc"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d
/etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release
/etc/php/apache2-php7.3/ext-active/ /etc/php/cgi-php7.3/ext-active/
/etc/php/cli-php7.3/ext-active/ /etc/revdep-rebuild /etc/sandbox.d
/etc/terminfo /var/spool/fax/etc/xferfaxlog"
CXXFLAGS="-O2 -pipe"
DISTDIR="/var/cache/distfiles"
ENV_UNSET="DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN PERL5LIB PERL5OPT
PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME
XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs
buildpkg config-protect-if-modified distlocks ebuild-locks fixlafiles
ipc-sandbox merge-sync multilib-strict network-sandbox news nostrip
parallel-fetch pid-sandbox preserve-libs protect-owned sandbox sfperms
strict unknown-features-warn unmerge-logs unmerge-orphans userfetch
userpriv usersandbox usersync xattr"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j25"
PKGDIR="/var/cache/binpkgs"
PORTAGE_BINHOST="http://inf-bl07/gentoo/binary-amd64"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times
--omit-dir-times --compress --force --whole-file --delete --stats
--human-readable --timeout=180 --exclude=/distfiles --exclude=/local
--exclude=/packages --exclude=/.git"
PORTAGE_TMPDIR="/var/tmp"
USE="acl ads amd64 apache2 berkdb bzip2 cli cluster crypt cxx dri
fortran freetds gdbm iconv ipv6 jbig kerberos ldap libtirpc logrotate
multilib ncurses nls nptl odbc openmp openrc pam pcre python radius
readline samba seccomp split-usr ssl tcpd unicode winbind xattr zlib"
ABI_X86="64" ADA_TARGET="gnat_2018" ALSA_CARDS="ali5451 als4000 atiixp
atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938
es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio
via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core
socache_shmcb unixd actions alias auth_basic authn_alias authn_anon
authn_dbm authn_default authn_file authz_dbm authz_default
authz_groupfile authz_host authz_owner authz_user autoindex cache cgi
cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter
file_cache filter headers include info log_config logio mem_cache mime
mime_magic negotiation rewrite setenvif speling status unique_id
userdir usertrack vhost_alias" APACHE2_MPMS="prefork"
CALLIGRA_FEATURES="karbon sheets words" COLLECTD_PLUGINS="df interface
irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx avx2 f16c
fma3 mmx mmxext pclmul popcnt sha sse sse2 sse3 sse4_1 sse4_2 sse4a
ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore
fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 nmea ntrip
navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq
superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="efi-64
pc" INPUT_DEVICES="libinput keyboard mouse" KERNEL="linux"
LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb
ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console
presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice"
PHP_TARGETS="php7-2" POSTGRES_TARGETS="postgres10 postgres11"
PYTHON_SINGLE_TARGET="python3_6" PYTHON_TARGETS="python2_7 python3_6"
RUBY_TARGETS="ruby24 ruby25" USERLAND="GNU" VIDEO_CARDS="amdgpu fbdev
intel nouveau radeon radeonsi vesa dummy v4l" XTABLES_ADDONS="quota2
psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy
condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude
chaos account"
Unset: CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK,
LANG, LC_ALL, LINGUAS, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS,
PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

I've also tested kernel 5.5 with the same behavior.

I believe kernel 4.12.12 did not have this issue, but I was running it
on different hardware. I have not yet tried 4.12.12 on this particular
hardware.
Please note that the same issue (net/ipv4/tcp_output.c:915) ocurrs on
different hardware with different NIC drivers (eg. e1000/e1000e) but
with the same kernel version.

Please let me know if I can provide more information or make more
specific tests.

Regards,

Vieri

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