rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6100/1:b..l P4341/1:b..l
	(detected by 0, t=10502 jiffies, g=23557, q=578 ncpus=2)
task:kworker/u4:8    state:R  running task     stack:21960 pid:4341  ppid:2      flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:820 [inline]
RIP: 0010:batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:771 [inline]
RIP: 0010:batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:825 [inline]
RIP: 0010:batadv_iv_ogm_schedule+0x64d/0xe90 net/batman-adv/bat_iv_ogm.c:868
Code: cd ab f7 e8 25 8e 3a 00 89 c3 31 ff 89 c6 e8 ea d0 ab f7 85 db 74 15 e8 a1 fd 95 f7 84 c0 74 18 e8 78 cd ab f7 48 8b 5c 24 48 <eb> 65 e8 6c cd ab f7 48 8b 5c 24 48 eb 59 e8 f0 8d 3a 00 89 c3 31
RSP: 0018:ffffc900049afa40 EFLAGS: 00000293
RAX: ffffffff89d508f8 RBX: 000000000000021e RCX: ffff888075e33b80
RDX: 0000000000000000 RSI: ffffffff8abf1340 RDI: ffffffff8abf1300
RBP: ffffc900049afb80 R08: dffffc0000000000 R09: fffffbfff2117049
R10: fffffbfff2117049 R11: 1ffffffff2117048 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880291848a4
 batadv_iv_send_outstanding_bat_ogm_packet+0x72d/0x840 net/batman-adv/bat_iv_ogm.c:1712
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
task:dhcpcd-run-hook state:R  running task     stack:24352 pid:6100  ppid:3919   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:path_openat+0x24d7/0x2e70 fs/namei.c:-1
Code: 8b 44 24 48 42 80 3c 38 00 48 8b 5c 24 08 74 08 48 89 df e8 8b f1 ee ff 48 8b 3b e8 73 de 04 00 4c 89 f3 eb 05 e8 b9 78 9d ff <48> 8b 7c 24 08 e8 8f cc 00 00 31 ff 44 89 e6 e8 05 7c 9d ff 45 85
RSP: 0018:ffffc900037779a0 EFLAGS: 00000293
RAX: ffffffff81e358f7 RBX: ffff88807407f900 RCX: ffff888030961dc0
RDX: 0000000000000000 RSI: 00000000fffffffe RDI: 0000000000000000
RBP: ffffc90003777bd0 R08: dffffc0000000000 R09: ffffed10046c0d59
R10: ffffed10046c0d59 R11: 1ffff110046c0d58 R12: 00000000fffffffe
R13: 1ffff920006eef8e R14: fffffffffffffffe R15: dffffc0000000000
 do_filp_open+0x1c1/0x3c0 fs/namei.c:3810
 do_sys_openat2+0x142/0x490 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1345
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1b8f3a20ba
RSP: 002b:00007ffee25852a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffee2585320 RCX: 00007f1b8f3a20ba
RDX: 0000000000080000 RSI: 00007ffee2585320 RDI: 00000000ffffff9c
RBP: 00007ffee2585310 R08: 00007ffee2585517 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000017
R13: 00007f1b8f37e000 R14: 00007ffee2585530 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 9828 jiffies! g23557 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26784 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:735
sched: RT throttling activated