rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9140/1:b..l P3728/1:b..l
	(detected by 0, t=10502 jiffies, g=59093, q=56 ncpus=2)
task:kworker/u4:5    state:R  running task     stack:21976 pid:3728  ppid:2      flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6727
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6751
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 unwind_next_frame+0x1a55/0x2220 arch/x86/kernel/unwind_orc.c:629
 arch_stack_walk+0x10d/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:955 [inline]
 __kmalloc_node_track_caller+0xb1/0x220 mm/slab_common.c:975
 kmalloc_reserve net/core/skbuff.c:446 [inline]
 __alloc_skb+0x135/0x670 net/core/skbuff.c:515
 __netdev_alloc_skb+0xfb/0x500 net/core/skbuff.c:579
 __netdev_alloc_skb_ip_align include/linux/skbuff.h:3226 [inline]
 netdev_alloc_skb_ip_align include/linux/skbuff.h:3236 [inline]
 batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:559 [inline]
 batadv_iv_ogm_queue_add+0x6a0/0xbf0 net/batman-adv/bat_iv_ogm.c:671
 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:850 [inline]
 batadv_iv_ogm_schedule+0xc49/0x1090 net/batman-adv/bat_iv_ogm.c:869
 batadv_iv_send_outstanding_bat_ogm_packet+0x6fa/0x800 net/batman-adv/bat_iv_ogm.c:1713
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
task:scsi_id         state:R  running task     stack:23448 pid:9140  ppid:9036   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:debug_lockdep_rcu_enabled+0x0/0x30 kernel/rcu/update.c:279
Code: 6d d8 f4 03 00 75 e7 48 c7 c7 00 01 0c 8b 48 c7 c6 20 25 0c 8b e8 70 70 ad f6 0f 0b eb d0 cc cc cc cc cc cc cc cc cc cc cc cc <31> c0 83 3d a7 a4 f4 03 00 74 1d 83 3d 32 d8 f4 03 00 74 14 65 48
RSP: 0018:ffffc9000514f838 EFLAGS: 00000246
RAX: 1ffff1100be56b9c RBX: ffff88805f2b5ce0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8e82c5a0 RDI: 0000000000000001
RBP: ffffc9000514fa30 R08: 0000000000000005 R09: ffffffff8a9c0f7b
R10: 0000000000000003 R11: ffff8880213f1dc0 R12: ffff8880750b8000
R13: 000000000000000c R14: ffff88807dd0dca8 R15: 0000000000000000
 mt_slot lib/maple_tree.c:814 [inline]
 mas_slot lib/maple_tree.c:847 [inline]
 mas_get_slot lib/maple_tree.c:6674 [inline]
 mas_validate_gaps lib/maple_tree.c:6972 [inline]
 mt_validate+0x3728/0x5ad0 lib/maple_tree.c:7240
 validate_mm_mt+0x165/0x670 mm/mmap.c:295
 validate_mm+0x16e/0x380 mm/mmap.c:332
 do_mmap+0xc7/0xf60 mm/mmap.c:1262
 vm_mmap_pgoff+0x1ca/0x2d0 mm/util.c:520
 ksys_mmap_pgoff+0x4f5/0x6d0 mm/mmap.c:1471
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f79d8088b74
RSP: 002b:00007ffc4747f878 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000fff88e8ff10 RCX: 00007f79d8088b74
RDX: 0000000000000001 RSI: 0000000000054188 RDI: 0000000000000000
RBP: 00007ffc4747fc10 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000802 R11: 0000000000000246 R12: 00007f79d7fc8000
R13: 00007ffc4747fc98 R14: fffffffffffff000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 9801 jiffies! g59093 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:26144 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 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 acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:567