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
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=a1e/1/0x4000000000000002 softirq=10913/10946 fqs=1 
rcu: 	 (t=25775 jiffies g=4701 q=1610)
rcu: rcu_preempt kthread starved for 19662 jiffies! g4701 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29392    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x80c/0x1f20 kernel/sched/core.c:3473
 schedule+0x7f/0x1b0 kernel/sched/core.c:3517
 schedule_timeout+0x398/0xcc0 kernel/time/timer.c:1804
 rcu_gp_kthread+0xd30/0x2130 kernel/rcu/tree.c:2194
 kthread+0x324/0x3e0 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:413
NMI backtrace for cpu 1
CPU: 1 PID: 5413 Comm: systemd-timesyn Not tainted 4.19.0-rc6-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:77 [inline]
 dump_stack+0x15a/0x20d lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0xf5/0x119 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:162 [inline]
 rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3276 [inline]
 rcu_pending kernel/rcu/tree.c:3319 [inline]
 rcu_check_callbacks.cold.61+0x5bd/0xd3d kernel/rcu/tree.c:2665
 update_process_times+0x2a/0x60 kernel/time/timer.c:1636
 tick_sched_handle.isra.5+0x6b/0x130 kernel/time/tick-sched.c:164
 tick_sched_timer+0x3c/0xf0 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x2fa/0xaa0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x2df/0x760 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline]
 smp_apic_timer_interrupt+0x114/0x530 arch/x86/kernel/apic/apic.c:1054
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864
 </IRQ>
RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline]
RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline]
RIP: 0010:smp_call_function_single+0x169/0x360 kernel/smp.c:302
Code: 00 45 85 ff 0f 84 85 00 00 00 44 89 e7 4c 89 f1 4c 89 ea 48 8d 74 24 40 e8 04 fb ff ff 41 89 c4 8b 44 24 58 a8 01 74 0b f3 90 <8b> 54 24 58 83 e2 01 75 f5 bf 01 00 00 00 e8 04 b6 e9 ff 65 8b 15
RSP: 0018:ffff8800985afa20 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000003 RBX: 1ffff100130b5f48 RCX: ffff8800985afa60
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8800aea2e000
RBP: ffff8800985afae8 R08: ffffed0015d45c01 R09: ffffed0015d45c00
R10: ffffed0015d45c00 R11: ffff8800aea2e007 R12: 0000000000000000
R13: ffffffff8152ca80 R14: 0000000000000000 R15: 0000000000000001
 smp_call_function_many+0x520/0x7a0 kernel/smp.c:434
 smp_call_function+0x36/0x60 kernel/smp.c:492
 on_each_cpu+0x2a/0x180 kernel/smp.c:604
 clock_was_set+0x17/0x20 kernel/time/hrtimer.c:861
 timekeeping_inject_offset+0x269/0x3e0 kernel/time/timekeeping.c:1315
 do_adjtimex+0x1b2/0x550 kernel/time/timekeeping.c:2357
 posix_clock_realtime_adj+0xc/0x10 kernel/time/posix-timers.c:205
 __do_sys_clock_adjtime kernel/time/posix-timers.c:1089 [inline]
 __se_sys_clock_adjtime+0xf1/0x190 kernel/time/posix-timers.c:1074
 __x64_sys_clock_adjtime+0x4f/0x70 kernel/time/posix-timers.c:1074
 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f0c4d4d31b7
Code: 73 01 c3 48 8b 0d e1 fc 2a 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 31 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 fc 2a 00 f7 d8 64 89 01 48
RSP: 002b:00007ffc47824e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 000055d46a9da630 RCX: 00007f0c4d4d31b7
RDX: fffffffffffffff1 RSI: 00007ffc47824f30 RDI: 0000000000000000
RBP: 00007ffc47824f30 R08: 0000000000000020 R09: 000000000000000d
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00007ffc47825020 R14: 0000000000000002 R15: 0000000000000001