IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 netlink: 80 bytes leftover after parsing attributes in process `syz-executor111'. netlink: 48 bytes leftover after parsing attributes in process `syz-executor111'. ============================= WARNING: suspicious RCU usage 4.14.146 #0 Not tainted ----------------------------- ./include/net/sch_generic.h:303 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 3 locks held by syz-executor111/6982: #0: (rcu_read_lock_bh){....}, at: [] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] #0: (rcu_read_lock_bh){....}, at: [] ip_finish_output2+0x256/0x14a0 net/ipv4/ip_output.c:213 #1: (rcu_read_lock_bh){....}, at: [] __dev_queue_xmit+0x1e2/0x25e0 net/core/dev.c:3459 #2: (&qdisc_tx_lock){+...}, at: [] spin_lock include/linux/spinlock.h:317 [inline] #2: (&qdisc_tx_lock){+...}, at: [] __dev_xmit_skb net/core/dev.c:3204 [inline] #2: (&qdisc_tx_lock){+...}, at: [] __dev_queue_xmit+0x11c0/0x25e0 net/core/dev.c:3493 stack backtrace: CPU: 1 PID: 6982 Comm: syz-executor111 Not tainted 4.14.146 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x197 lib/dump_stack.c:53 lockdep_rcu_suspicious+0x153/0x15d kernel/locking/lockdep.c:4662 qdisc_root include/net/sch_generic.h:303 [inline] netem_enqueue+0x79c/0x2780 net/sched/sch_netem.c:472 __dev_xmit_skb net/core/dev.c:3229 [inline] __dev_queue_xmit+0x12da/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip_finish_output2+0xddc/0x14a0 net/ipv4/ip_output.c:229 ip_finish_output+0x56d/0xc60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_mc_output+0x24a/0xd40 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:462 [inline] ip_local_out+0x97/0x170 net/ipv4/ip_output.c:124 ip_send_skb+0x3e/0xc0 net/ipv4/ip_output.c:1418 udp_send_skb+0x616/0xb90 net/ipv4/udp.c:833 udp_sendmsg+0x16df/0x1da0 net/ipv4/udp.c:1057 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x152/0x3a0 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2178 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x441b59 RSP: 002b:00007ffcb1fc9af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000315f6576616c RCX: 0000000000441b59 RDX: 04000000000001a8 RSI: 0000000020007fc0 RDI: 0000000000000005 RBP: 735f656764697262 R08: 0000000001bbbbbb R09: 0000000001bbbbbb R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000004030f0 R14: 0000000000000000 R15: 0000000000000000 IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready