syzbot

BUG: unable to handle page fault for address: ffffffff00000030
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 9a90067 P4D 9a90067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 26 Comm: kworker/u4:2 Not tainted 5.9.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krdsd rds_shutdown_worker
RIP: 0010:ip6t_do_table+0xa89/0x1920 net/ipv6/netfilter/ip6_tables.c:334
Code: ee e8 3b 13 74 fa 40 84 ed 0f 85 6a 05 00 00 e8 ed 16 74 fa 48 8d 7b 30 48 89 f8 48 c1 e8 03 42 80 3c 30 00 0f 85 e6 0d 00 00 <48> 83 7b 30 00 0f 84 04 02 00 00 e8 c7 16 74 fa 49 8d 44 24 20 48
RSP: 0018:ffffc90000007478 EFLAGS: 00010246
RAX: 1fffffffe0000006 RBX: ffffffff00000000 RCX: ffffffff870036e5
RDX: ffff8880a906c0c0 RSI: ffffffff870036f3 RDI: ffffffff00000030
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8c5f49e7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880001021b8
R13: ffff8880001021c0 R14: dffffc0000000000 R15: ffff888000102110
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000030 CR3: 0000000207d72000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 nf_hook_entry_hookfn include/linux/netfilter.h:136 [inline]
 nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:512
 nf_hook_state_init include/linux/netfilter.h:154 [inline]
 nf_hook+0x38f/0x620 include/linux/netfilter.h:253
 NF_HOOK include/linux/netfilter.h:299 [inline]
 ip6_xmit+0xdd2/0x1e80 net/ipv6/ip6_output.c:280
 inet6_csk_xmit+0x339/0x610 net/ipv6/inet6_connection_sock.c:135
 __tcp_transmit_skb+0x1884/0x3690 net/ipv4/tcp_output.c:1246
 tcp_transmit_skb net/ipv4/tcp_output.c:1264 [inline]
 tcp_xmit_probe_skb+0x2bb/0x360 net/ipv4/tcp_output.c:3839
 tcp_write_wakeup+0x1bd/0x610 net/ipv4/tcp_output.c:3892
 tcp_keepalive_timer+0xab8/0xe40 net/ipv4/tcp_timer.c:721
 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413
 expire_timers kernel/time/timer.c:1458 [inline]
 __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755
 __run_timers kernel/time/timer.c:1736 [inline]
 run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
 __do_softirq+0x1f7/0xa91 kernel/softirq.c:298
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
 do_softirq kernel/softirq.c:343 [inline]
 do_softirq+0x154/0x1b0 kernel/softirq.c:330
 __local_bh_enable_ip+0x196/0x1f0 kernel/softirq.c:195
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline]
 ip_finish_output2+0x869/0x21b0 net/ipv4/ip_output.c:229
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x779/0xcb0 net/ipv4/ip_output.c:288
 ip_finish_output+0x34/0x1f0 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip_output+0x196/0x310 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:443 [inline]
 ip_local_out net/ipv4/ip_output.c:125 [inline]
 __ip_queue_xmit+0x8e9/0x19c0 net/ipv4/ip_output.c:530
 __tcp_transmit_skb+0x1884/0x3690 net/ipv4/tcp_output.c:1246
 tcp_transmit_skb net/ipv4/tcp_output.c:1264 [inline]
 tcp_write_xmit+0xebf/0x5c70 net/ipv4/tcp_output.c:2527
 __tcp_push_pending_frames+0xaa/0x330 net/ipv4/tcp_output.c:2705
 tcp_send_fin+0x117/0xbb0 net/ipv4/tcp_output.c:3262
 tcp_close+0xb31/0x11f0 net/ipv4/tcp.c:2492
 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431
 __sock_release net/socket.c:596 [inline]
 sock_release+0x87/0x1b0 net/socket.c:624
 rds_tcp_conn_path_shutdown+0x1e5/0x3f0 net/rds/tcp_connect.c:216
 rds_conn_shutdown+0x23e/0x904 net/rds/connection.c:386
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Modules linked in:
CR2: ffffffff00000030
---[ end trace 864646b20e9dd61e ]---
RIP: 0010:ip6t_do_table+0xa89/0x1920 net/ipv6/netfilter/ip6_tables.c:334
Code: ee e8 3b 13 74 fa 40 84 ed 0f 85 6a 05 00 00 e8 ed 16 74 fa 48 8d 7b 30 48 89 f8 48 c1 e8 03 42 80 3c 30 00 0f 85 e6 0d 00 00 <48> 83 7b 30 00 0f 84 04 02 00 00 e8 c7 16 74 fa 49 8d 44 24 20 48
RSP: 0018:ffffc90000007478 EFLAGS: 00010246
RAX: 1fffffffe0000006 RBX: ffffffff00000000 RCX: ffffffff870036e5
RDX: ffff8880a906c0c0 RSI: ffffffff870036f3 RDI: ffffffff00000030
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8c5f49e7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880001021b8
R13: ffff8880001021c0 R14: dffffc0000000000 R15: ffff888000102110
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000030 CR3: 0000000207d72000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400