batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_1
=============================
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
WARNING: suspicious RCU usage
4.14.281-syzkaller #0 Not tainted
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
-----------------------------
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
net/netfilter/nf_queue.c:244 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
2 locks held by swapper/0/0:
 #0:  (rcu_callback){....}, at: [<ffffffff8146dbde>] __rcu_reclaim kernel/rcu/rcu.h:185 [inline]
 #0:  (rcu_callback){....}, at: [<ffffffff8146dbde>] rcu_do_batch kernel/rcu/tree.c:2699 [inline]
 #0:  (rcu_callback){....}, at: [<ffffffff8146dbde>] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
 #0:  (rcu_callback){....}, at: [<ffffffff8146dbde>] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
 #0:  (rcu_callback){....}, at: [<ffffffff8146dbde>] rcu_process_callbacks+0x84e/0x1180 kernel/rcu/tree.c:2946
 #1:  (
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
&(&inst->lock)->rlock
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
){+.-.}, at: [<ffffffff85e4ca9f>] spin_lock_bh include/linux/spinlock.h:322 [inline]
){+.-.}, at: [<ffffffff85e4ca9f>] nfqnl_flush+0x2f/0x2a0 net/netfilter/nfnetlink_queue.c:232

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.281-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 nf_reinject+0x56e/0x700 net/netfilter/nf_queue.c:244
 nfqnl_flush+0x1ab/0x2a0 net/netfilter/nfnetlink_queue.c:237
 instance_destroy_rcu+0x19/0x30 net/netfilter/nfnetlink_queue.c:171
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2699 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
 rcu_process_callbacks+0x780/0x1180 kernel/rcu/tree.c:2946
 __do_softirq+0x24d/0x9ff kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x193/0x240 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
RSP: 0018:ffffffff88e07e78 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff11e1314 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff88e74d04
RBP: ffffffff88f09890 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: fffffbfff11ce890
R13: ffffffff88e74480 R14: 0000000000000000 R15: 0000000000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
 default_idle+0x47/0x370 arch/x86/kernel/process.c:558
 cpuidle_idle_call kernel/sched/idle.c:156 [inline]
 do_idle+0x250/0x3c0 kernel/sched/idle.c:246
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:351
 start_kernel+0x750/0x770 init/main.c:708
 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
Bluetooth: hci1 command 0x0419 tx timeout
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Bluetooth: hci3 command 0x0419 tx timeout
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
Bluetooth: hci5 command 0x0419 tx timeout
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Bluetooth: hci4 command 0x0419 tx timeout
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
Bluetooth: hci0 command 0x0419 tx timeout
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Bluetooth: hci2 command 0x0419 tx timeout
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_0
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_1
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
hrtimer: interrupt took 21798 ns
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'.
ip_tables: iptables: counters copy to user failed while replacing table
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'.
ip_tables: iptables: counters copy to user failed while replacing table
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'.
ip_tables: iptables: counters copy to user failed while replacing table
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'.
ip_tables: iptables: counters copy to user failed while replacing table
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'.
ip_tables: iptables: counters copy to user failed while replacing table
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'.
ip_tables: iptables: counters copy to user failed while replacing table
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue