BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor.0/7651 caller is dev_recursion_level include/linux/netdevice.h:3052 [inline] caller is ip6_skb_dst_mtu include/net/ip6_route.h:245 [inline] caller is ip6_finish_output+0x335/0xdc0 net/ipv6/ip6_output.c:149 CPU: 0 PID: 7651 Comm: syz-executor.0 Not tainted 5.1.0-rc3-next-20190405 #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 __this_cpu_preempt_check+0x246/0x270 lib/smp_processor_id.c:47 dev_recursion_level include/linux/netdevice.h:3052 [inline] ip6_skb_dst_mtu include/net/ip6_route.h:245 [inline] ip6_finish_output+0x335/0xdc0 net/ipv6/ip6_output.c:149 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x235/0x7f0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:433 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip6_xmit+0xe41/0x20c0 net/ipv6/ip6_output.c:275 inet6_csk_xmit+0x2fb/0x5d0 net/ipv6/inet6_connection_sock.c:139 __tcp_transmit_skb+0x1a32/0x3750 net/ipv4/tcp_output.c:1155 tcp_transmit_skb net/ipv4/tcp_output.c:1171 [inline] tcp_send_syn_data net/ipv4/tcp_output.c:3494 [inline] tcp_connect+0x1e47/0x4280 net/ipv4/tcp_output.c:3533 tcp_v6_connect+0x150b/0x20a0 net/ipv6/tcp_ipv6.c:331 __inet_stream_connect+0x83f/0xea0 net/ipv4/af_inet.c:659 tcp_sendmsg_fastopen net/ipv4/tcp.c:1155 [inline] tcp_sendmsg_locked+0x231f/0x37f0 net/ipv4/tcp.c:1197 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1431 inet_sendmsg+0x147/0x5e0 net/ipv4/af_inet.c:802 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:661 __sys_sendto+0x262/0x380 net/socket.c:1932 __do_sys_sendto net/socket.c:1944 [inline] __se_sys_sendto net/socket.c:1940 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1940 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4582b9 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9d89cb9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004582b9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000073bfa0 R08: 0000000020000040 R09: 000000000000001c R10: 0000000020000001 R11: 0000000000000246 R12: 00007f9d89cba6d4 R13: 00000000004c59b6 R14: 00000000004d9d10 R15: 00000000ffffffff BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor.0/7651 caller is dev_recursion_level include/linux/netdevice.h:3052 [inline] caller is ip6_skb_dst_mtu include/net/ip6_route.h:245 [inline] caller is ip6_finish_output+0x335/0xdc0 net/ipv6/ip6_output.c:149 CPU: 1 PID: 7651 Comm: syz-executor.0 Not tainted 5.1.0-rc3-next-20190405 #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 __this_cpu_preempt_check+0x246/0x270 lib/smp_processor_id.c:47 dev_recursion_level include/linux/netdevice.h:3052 [inline] ip6_skb_dst_mtu include/net/ip6_route.h:245 [inline] ip6_finish_output+0x335/0xdc0 net/ipv6/ip6_output.c:149 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x235/0x7f0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:433 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip6_xmit+0xe41/0x20c0 net/ipv6/ip6_output.c:275 inet6_csk_xmit+0x2fb/0x5d0 net/ipv6/inet6_connection_sock.c:139 __tcp_transmit_skb+0x1a32/0x3750 net/ipv4/tcp_output.c:1155 tcp_transmit_skb net/ipv4/tcp_output.c:1171 [inline] tcp_send_synack+0x4b0/0x15b0 net/ipv4/tcp_output.c:3192 tcp_rcv_synsent_state_process net/ipv4/tcp_input.c:5943 [inline] tcp_rcv_state_process+0x225d/0x4d93 net/ipv4/tcp_input.c:6025 tcp_v6_do_rcv+0x7da/0x12c0 net/ipv6/tcp_ipv6.c:1362 sk_backlog_rcv include/net/sock.h:945 [inline] __release_sock+0x12e/0x3a0 net/core/sock.c:2413 release_sock+0x59/0x1c0 net/core/sock.c:2929 inet_wait_for_connect net/ipv4/af_inet.c:592 [inline] __inet_stream_connect+0x59f/0xea0 net/ipv4/af_inet.c:684 tcp_sendmsg_fastopen net/ipv4/tcp.c:1155 [inline] tcp_sendmsg_locked+0x231f/0x37f0 net/ipv4/tcp.c:1197 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1431 inet_sendmsg+0x147/0x5e0 net/ipv4/af_inet.c:802 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:661 __sys_sendto+0x262/0x380 net/socket.c:1932 __do_sys_sendto net/socket.c:1944 [inline] __se_sys_sendto net/socket.c:1940 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1940 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4582b9 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9d89cb9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004582b9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000073bfa0 R08: 0000000020000040 R09: 000000000000001c R10: 0000000020000001 R11: 0000000000000246 R12: 00007f9d89cba6d4 R13: 00000000004c59b6 R14: 00000000004d9d10 R15: 00000000ffffffff BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor.0/7651 caller is dev_recursion_level include/linux/netdevice.h:3052 [inline] caller is ip6_skb_dst_mtu include/net/ip6_route.h:245 [inline] caller is ip6_finish_output+0x335/0xdc0 net/ipv6/ip6_output.c:149 CPU: 1 PID: 7651 Comm: syz-executor.0 Not tainted 5.1.0-rc3-next-20190405 #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 __this_cpu_preempt_check+0x246/0x270 lib/smp_processor_id.c:47 dev_recursion_level include/linux/netdevice.h:3052 [inline] ip6_skb_dst_mtu include/net/ip6_route.h:245 [inline] ip6_finish_output+0x335/0xdc0 net/ipv6/ip6_output.c:149 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x235/0x7f0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:433 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip6_xmit+0xe41/0x20c0 net/ipv6/ip6_output.c:275 inet6_csk_xmit+0x2fb/0x5d0 net/ipv6/inet6_connection_sock.c:139 __tcp_transmit_skb+0x1a32/0x3750 net/ipv4/tcp_output.c:1155 __tcp_send_ack.part.0+0x3c6/0x5b0 net/ipv4/tcp_output.c:3648 __tcp_send_ack net/ipv4/tcp_output.c:3654 [inline] tcp_send_ack+0x88/0xa0 net/ipv4/tcp_output.c:3654 tcp_send_challenge_ack.isra.0+0x250/0x300 net/ipv4/tcp_input.c:3451 tcp_validate_incoming+0x55e/0x1660 net/ipv4/tcp_input.c:5438 tcp_rcv_state_process+0xb6b/0x4d93 net/ipv4/tcp_input.c:6052 tcp_v6_do_rcv+0x7da/0x12c0 net/ipv6/tcp_ipv6.c:1362 sk_backlog_rcv include/net/sock.h:945 [inline] __release_sock+0x12e/0x3a0 net/core/sock.c:2413 release_sock+0x59/0x1c0 net/core/sock.c:2929 inet_wait_for_connect net/ipv4/af_inet.c:592 [inline] __inet_stream_connect+0x59f/0xea0 net/ipv4/af_inet.c:684 tcp_sendmsg_fastopen net/ipv4/tcp.c:1155 [inline] tcp_sendmsg_locked+0x231f/0x37f0 net/ipv4/tcp.c:1197 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1431 inet_sendmsg+0x147/0x5e0 net/ipv4/af_inet.c:802 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:661 __sys_sendto+0x262/0x380 net/socket.c:1932 __do_sys_sendto net/socket.c:1944 [inline] __se_sys_sendto net/socket.c:1940 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1940 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4582b9 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9d89cb9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004582b9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000073bfa0 R08: 0000000020000040 R09: 000000000000001c R10: 0000000020000001 R11: 0000000000000246 R12: 00007f9d89cba6d4 R13: 00000000004c59b6 R14: 00000000004d9d10 R15: 00000000ffffffff