BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor.1/9005 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: 9005 Comm: syz-executor.1 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_connect+0x2e18/0x4280 net/ipv4/tcp_output.c:3534 tcp_v6_connect+0x150b/0x20a0 net/ipv6/tcp_ipv6.c:331 __inet_stream_connect+0x83f/0xea0 net/ipv4/af_inet.c:659 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:723 __sys_connect+0x266/0x330 net/socket.c:1808 __do_sys_connect net/socket.c:1819 [inline] __se_sys_connect net/socket.c:1816 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1816 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:00007ff6d676fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004582b9 RDX: 000000000000001c RSI: 0000000020000140 RDI: 0000000000000006 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff6d67706d4 R13: 00000000004be64c R14: 00000000004cf1e0 R15: 00000000ffffffff