BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor.3/8075 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: 8075 Comm: syz-executor.3 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 sctp_v6_xmit+0x313/0x660 net/sctp/ipv6.c:232 sctp_packet_transmit+0x1bc4/0x36f0 net/sctp/output.c:641 sctp_packet_singleton net/sctp/outqueue.c:787 [inline] sctp_outq_flush_ctrl.constprop.0+0x6d4/0xd50 net/sctp/outqueue.c:918 sctp_outq_flush+0xe8/0x2780 net/sctp/outqueue.c:1200 sctp_outq_uncork+0x6c/0x80 net/sctp/outqueue.c:772 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] sctp_do_sm+0x2575/0x5770 net/sctp/sm_sideeffect.c:1191 sctp_primitive_ASSOCIATE+0x9d/0xd0 net/sctp/primitive.c:88 __sctp_connect+0x8cd/0xce0 net/sctp/socket.c:1226 __sctp_setsockopt_connectx+0x133/0x1a0 net/sctp/socket.c:1349 sctp_setsockopt_connectx_old net/sctp/socket.c:1365 [inline] sctp_setsockopt net/sctp/socket.c:4656 [inline] sctp_setsockopt+0x15db/0x6fe0 net/sctp/socket.c:4620 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3120 __sys_setsockopt+0x180/0x280 net/socket.c:2046 __do_sys_setsockopt net/socket.c:2057 [inline] __se_sys_setsockopt net/socket.c:2054 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2054 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:00007f945c4cac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004582b9 RDX: 000000000000006b RSI: 0000000000000084 RDI: 0000000000000006 RBP: 000000000073bfa0 R08: 000000000000001c R09: 0000000000000000 R10: 000000002055bfe4 R11: 0000000000000246 R12: 00007f945c4cb6d4 R13: 00000000004cd198 R14: 00000000004dafa0 R15: 00000000ffffffff