rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7742/1:b..l P5400/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=32717, q=400 ncpus=2)
task:kworker/u8:16   state:R  running task     stack:24368 pid:5400  tgid:5400  ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0xe37/0x5490 kernel/sched/core.c:6529
 preempt_schedule_notrace+0x62/0xe0 kernel/sched/core.c:6801
 preempt_schedule_notrace_thunk+0x1a/0x30 arch/x86/entry/thunk.S:13
 rcu_is_watching+0x8e/0xc0 kernel/rcu/tree.c:727
 rcu_read_unlock include/linux/rcupdate.h:868 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0xc0d/0x10f0 net/batman-adv/network-coding.c:719
 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:modprobe        state:R  running task     stack:25008 pid:7742  tgid:7742  ppid:2456   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0xe37/0x5490 kernel/sched/core.c:6529
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:6851
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:175 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2d/0x60 kernel/kcov.c:207
Code: fa 65 48 8b 15 04 dc 75 7e 65 8b 05 05 dc 75 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 1c 16 00 00 85 c0 74 2b <8b> 82 f8 15 00 00 83 f8 02 75 20 48 8b 8a 00 16 00 00 8b 92 fc 15
RSP: 0018:ffffc9000360f748 EFLAGS: 00000246
RAX: 0000000080000000 RBX: ffff88807b64b000 RCX: ffffffff8ad91ff3
RDX: ffff88807ef58000 RSI: ffffffff8ad92005 RDI: 0000000000000007
RBP: dffffc0000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000006
R13: 000000000000000e R14: 0000000000000001 R15: ffff8880791738b8
 ma_meta_end lib/maple_tree.c:927 [inline]
 mas_data_end lib/maple_tree.c:1455 [inline]
 mt_validate_nulls+0x475/0x9e0 lib/maple_tree.c:7552
 mt_validate+0x3148/0x4390 lib/maple_tree.c:7599
 validate_mm+0x9c/0x4b0 mm/mmap.c:288
 __split_vma+0xd68/0x11c0 mm/mmap.c:2440
 split_vma mm/mmap.c:2466 [inline]
 vma_modify+0x2b9/0x360 mm/mmap.c:2507
 vma_modify_flags include/linux/mm.h:3352 [inline]
 mprotect_fixup+0x220/0xc40 mm/mprotect.c:637
 do_mprotect_pkey+0x9d7/0xd70 mm/mprotect.c:820
 __do_sys_mprotect mm/mprotect.c:841 [inline]
 __se_sys_mprotect mm/mprotect.c:838 [inline]
 __x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:838
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa36c8cebb7
RSP: 002b:00007ffe07619578 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007fa36c8e2ab0 RCX: 00007fa36c8cebb7
RDX: 0000000000000001 RSI: 0000000000002000 RDI: 00007fa36c8e0000
RBP: 00007ffe07619690 R08: 00007ffe07610000 R09: 00007fa36c8ab5c0
R10: 00007fa36c8b3858 R11: 0000000000000206 R12: 00007fa36c8e2ab0
R13: 00007fa36c8d6eda R14: 00007fa36c8e19f0 R15: 00007fa36c8e1f40
 </TASK>
rcu: rcu_preempt kthread starved for 10380 jiffies! g32717 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:27312 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0xe37/0x5490 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6621
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2236
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:111