netdev - WARNING from tcp.c

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Date:   Tue, 28 Aug 2018 10:11:00 -0400
From:   Adam Mitchell <adamhmitchell@...il.com>
To:     netdev@...r.kernel.org
Subject: WARNING from tcp.c

Can anyone help me understand why a busy database server gets these
kernel warnings?  It comes from this WARN_ON macro, apparently because
the socket is still owned by the user process.  Why would that happen?

     WARN_ON(sock_owned_by_user(sk));


[726780.788201] WARNING: CPU: 15 PID: 52245 at net/ipv4/tcp.c:2278
tcp_close+0x40f/0x430
[726780.794947] Modules linked in: binfmt_misc nf_conntrack_netlink
nfnetlink_queue tcp_diag inet_diag isofs ip6table_mangle ip6table_raw
ip6table_nat nf_nat_ipv6 iptable_security xt_CT iptable_raw
iptable_nat nf_nat_ipv4 nf_nat iptable_mangle xt_pkttype xt_NFLOG
nfnetlink_log xt_u32 xt_multiport xt_set xt_conntrack
ip_set_hash_netport ip_set_hash_ipport ip_set_hash_net ip_set_hash_ip
ip_set nfnetlink nf_conntrack_proto_gre nf_conntrack_ipv6
nf_defrag_ipv6 ip6table_filter ip6_tables xt_LOG nf_conntrack_tftp
nf_conntrack_ftp nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack
iptable_filter zfs(PO) zunicode(PO) zavl(PO) icp(PO) sb_edac
intel_powerclamp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
pcbc aesni_intel crypto_simd glue_helper cryptd cirrus snd_seq
zcommon(PO) ttm intel_rapl_perf snd_seq_device
[726780.848696]  drm_kms_helper znvpair(PO) snd_pcm snd_timer spl(O)
drm snd soundcore syscopyarea sysfillrect pcspkr sysimgblt input_leds
fb_sys_fops i2c_piix4 ip_tables xfs libcrc32c ata_generic pata_acpi
ata_piix xen_blkfront crc32c_intel libata ena(O) serio_raw floppy
sunrpc
[726780.863916] CPU: 15 PID: 52245 Comm: mysqld Tainted: P        W  O
    4.16.13-1.el7.elrepo.x86_64 #1
[726780.869486] Hardware name: Xen HVM domU, BIOS 4.2.amazon 08/24/2006
[726780.873756] RIP: 0010:tcp_close+0x40f/0x430
[726780.877049] RSP: 0018:ffffc90063a87dd0 EFLAGS: 00010202
[726780.880913] RAX: 0000000000000001 RBX: ffff8839cbb4b300 RCX:
0000000000000001
[726780.885708] RDX: 0000000000400001 RSI: 0000000000023540 RDI:
000000000000002b
[726780.890412] RBP: ffffc90063a87df0 R08: 0000000000000000 R09:
0000000000000101
[726780.895192] R10: 00000000000003ff R11: 0000000000002057 R12:
ffff8839cbb4b388
[726780.900029] R13: 0000000000000009 R14: ffff8839cbb4b3c8 R15:
ffff883c5ed14900
[726780.904777] FS:  00007f6acd467700(0000) GS:ffff883c8b1c0000(0000)
knlGS:0000000000000000
[726780.909964] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[726780.914078] CR2: 00007f6cd5d430c8 CR3: 0000003c7e6b6005 CR4:
00000000001606e0
[726780.918837] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[726780.923433] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[726780.927882] Call Trace:
[726780.930410]  inet_release+0x42/0x70
[726780.933423]  inet6_release+0x30/0x40
[726780.936439]  sock_release+0x25/0x80
[726780.939421]  sock_close+0x12/0x20
[726780.942342]  __fput+0xea/0x220
[726780.945170]  ____fput+0xe/0x10
[726780.947963]  task_work_run+0x8c/0xb0
[726780.951052]  exit_to_usermode_loop+0x6b/0x95
[726780.954480]  do_syscall_64+0x182/0x1b0
[726780.957586]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[726780.961288] RIP: 0033:0x7fd82b27085d
[726780.964349] RSP: 002b:00007f6acd466b50 EFLAGS: 00000293 ORIG_RAX:
0000000000000003
[726780.969280] RAX: 0000000000000000 RBX: 00007f65b2418220 RCX:
00007fd82b27085d
[726780.973987] RDX: 0000000000000003 RSI: 00007f6d5e9990c0 RDI:
00000000000002d8
[726780.978689] RBP: 00007f6acd466c00 R08: 0000000001622848 R09:
00000000000001f8
[726780.983373] R10: 0000000000000000 R11: 0000000000000293 R12:
0000000000000000
[726780.988049] R13: 00007f6d5e9990c0 R14: 0000000001d87cc0 R15:
00000000000002d8
[726780.992700] Code: ff 48 8b 43 28 31 f6 48 89 df 48 8b 40 10 e8 49
2d 4e 00 48 8b 43 30 48 8b 80 98 01 00 00 65 48 ff 80 90 01 00 00 e9
49 ff ff ff <0f> 0b e9 ab fc ff ff 48 8b 43 28 31 f6 48 89 df 48 8b 40
10 e8
[726781.004156] ---[ end trace 8525f27644ac4631 ]---