[lkp] [netfilter] 68263ddb47: WARNING: CPU: 0 PID: 1225 at net/netfilter/nf_conntrack_seqadj.c:232 nf_ct_seq_offset+0x7a/0x9a

FYI, we noticed the following commit:

https://github.com/0day-ci/linux fgao-ikuai8-com/netfilter-seqadj-Fix-some-possible-panics-of-seqadj-when-mem-is-exhausted/20160902-095727
commit 68263ddb4777cc996868498e3d56f616851966d2 ("netfilter: seqadj: Fix some possible panics of seqadj when mem is exhausted")

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -m 320M

caused below changes:


+------------------------------------------------------------------+------------+------------+
|                                                                  | c73c248490 | 68263ddb47 |
+------------------------------------------------------------------+------------+------------+
| boot_successes                                                   | 7          | 0          |
| boot_failures                                                    | 7          | 14         |
| BUG:kernel_reboot-without-warning_in_test_stage                  | 7          |            |
| WARNING:at_net/netfilter/nf_conntrack_seqadj.c:#nf_ct_seq_offset | 0          | 14         |
| calltrace:SyS_connect                                            | 0          | 14         |
| calltrace:SyS_socketcall                                         | 0          | 14         |
| invoked_oom-killer:gfp_mask=0x                                   | 0          | 1          |
| Mem-Info                                                         | 0          | 1          |
+------------------------------------------------------------------+------------+------------+



[   22.475640] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
[   22.602089] Kernel tests: Boot OK!
[   23.465616] ------------[ cut here ]------------
[   23.466477] WARNING: CPU: 0 PID: 1225 at net/netfilter/nf_conntrack_seqadj.c:232 nf_ct_seq_offset+0x7a/0x9a
[   23.468458] Missing nfct_seqadj_ext_add() setup call
[   23.469319] CPU: 0 PID: 1225 Comm: busybox Not tainted 4.8.0-rc2-00241-g68263dd #1
[   23.470629] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   23.472138]  00000000 8ca4db58 8ca4db28 8a045c76 8ca4db44 89e4a2a3 000000e8 8a97c7b6
[   23.491476]  00000001 00000000 00000001 8ca4db60 89e4a2e7 00000009 00000000 8ca4db58
[   23.493027]  8b2c55b0 8ca4db74 8ca4db80 8a97c7b6 8b2c55da 000000e8 8b2c55b0 8e358000
[   23.494559] Call Trace:
[   23.495013]  [<8a045c76>] dump_stack+0x16/0x18
[   23.495777]  [<89e4a2a3>] __warn+0xaa/0xc1
[   23.496500]  [<8a97c7b6>] ? nf_ct_seq_offset+0x7a/0x9a
[   23.497392]  [<89e4a2e7>] warn_slowpath_fmt+0x2d/0x32
[   23.498270]  [<8a97c7b6>] nf_ct_seq_offset+0x7a/0x9a
[   23.499134]  [<8a97b2a3>] tcp_packet+0x63f/0xb93
[   23.499924]  [<89f39167>] ? cache_alloc_refill+0x203/0x80a
[   23.500896]  [<89e6863e>] ? preempt_count_sub+0x8f/0xd4
[   23.501824]  [<8a976d99>] ? nf_conntrack_in+0x2f9/0x53e
[   23.502747]  [<8a976dc2>] ? nf_conntrack_in+0x322/0x53e
[   23.521594]  [<89e6863e>] ? preempt_count_sub+0x8f/0xd4
[   23.522508]  [<8a976f5b>] nf_conntrack_in+0x4bb/0x53e
[   23.523399]  [<8a9e6a9a>] ipv4_conntrack_local+0x40/0x48
[   23.524338]  [<8a9729c5>] nf_iterate+0x3b/0x8e
[   23.525128]  [<8a972a5f>] nf_hook_slow+0x47/0xc7
[   23.525925]  [<8a9a47f1>] __ip_local_out+0xdb/0xea
[   23.526766]  [<8a9a3750>] ? ip_options_rcv_srr+0x30e/0x30e
[   23.527785]  [<8a9a4818>] ip_local_out+0x18/0x9e
[   23.528600]  [<8a9a4dd8>] ip_queue_xmit+0x395/0x41e
[   23.529469]  [<8a9b93cb>] tcp_transmit_skb+0x701/0x740
[   23.530420]  [<8a9bbcba>] tcp_connect+0x65a/0x6be
[   23.531247]  [<8a9bd9e3>] tcp_v4_connect+0x41d/0x45c
[   23.532115]  [<8a9d1a6c>] __inet_stream_connect+0x77/0x27e
[   23.533107]  [<89e6863e>] ? preempt_count_sub+0x8f/0xd4
[   23.534018]  [<89e4d8e1>] ? __local_bh_enable_ip+0xc4/0xea
[   23.534949]  [<8a9d1c9e>] inet_stream_connect+0x2b/0x3e
[   23.535862]  [<8a935255>] SyS_connect+0x77/0x9d
[   23.536662]  [<89f74959>] ? __fd_install+0x163/0x1c5
[   23.538079]  [<89e6863e>] ? preempt_count_sub+0x8f/0xd4





Thanks,
Xiaolong