rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4328/1:b..l
	(detected by 1, t=10502 jiffies, g=268565, q=308)
task:kworker/u4:3    state:R  running task     stack:25888 pid: 4328 ppid:     2 flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6253
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6668
 irqentry_exit+0x31/0x80 kernel/entry/common.c:425
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:756 [inline]
RIP: 0010:batadv_iv_ogm_schedule_buff+0x606/0x1430 net/batman-adv/bat_iv_ogm.c:826
Code: c6 e8 0e 05 9c f8 40 84 ed 5e 0f 84 be 04 00 00 e8 1f 01 9c f8 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 6c 0d 00 00 48 8b 2b <48> 85 ed 0f 84 28 01 00 00 e8 fc 00 9c f8 48 81 ed c8 01 00 00 0f
RSP: 0018:ffffc900083a7b98 EFLAGS: 00000246
RAX: 1ffff110081ef1e8 RBX: ffff888040f78f40 RCX: 0000000000000000
RDX: ffff888026ed1d00 RSI: ffffffff88dba9d1 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff88dba9c2 R11: 0000000000000000 R12: ffff88807caf4894
R13: dffffc0000000000 R14: ffff88801d57cc80 R15: 00000000000001e8
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline]
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x740/0x8e0 net/batman-adv/bat_iv_ogm.c:1713
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	e8 0e 05 9c f8       	callq  0xf89c0513
   5:	40 84 ed             	test   %bpl,%bpl
   8:	5e                   	pop    %rsi
   9:	0f 84 be 04 00 00    	je     0x4cd
   f:	e8 1f 01 9c f8       	callq  0xf89c0133
  14:	48 89 d8             	mov    %rbx,%rax
  17:	48 c1 e8 03          	shr    $0x3,%rax
  1b:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  20:	0f 85 6c 0d 00 00    	jne    0xd92
  26:	48 8b 2b             	mov    (%rbx),%rbp
* 29:	48 85 ed             	test   %rbp,%rbp <-- trapping instruction
  2c:	0f 84 28 01 00 00    	je     0x15a
  32:	e8 fc 00 9c f8       	callq  0xf89c0133
  37:	48 81 ed c8 01 00 00 	sub    $0x1c8,%rbp
  3e:	0f                   	.byte 0xf