rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P14093/1:b..l P2546/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=110677, q=627 ncpus=2)
task:kworker/u8:11   state:R  running task     stack:20528 pid:2546  tgid:2546  ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:867 [inline]
RIP: 0010:batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
RIP: 0010:batadv_nc_worker+0x1ee/0x610 net/batman-adv/network-coding.c:719
Code: e8 87 db 7a f6 48 8b 6d 00 48 85 ed 74 17 48 81 c5 38 fe ff ff 74 0e e8 b0 a1 13 f6 eb b8 e8 a9 a1 13 f6 eb 05 e8 a2 a1 13 f6 <e8> 2d 97 35 00 89 c3 31 ff 89 c6 e8 d2 a5 13 f6 85 db 74 15 e8 e9
RSP: 0018:ffffc900095c7b58 EFLAGS: 00000293
RAX: ffffffff8b7fc4c7 RBX: ffff888020630ac0 RCX: ffff88802a1a0000
RDX: 0000000000000000 RSI: ffffffff8c605ba0 RDI: ffffffff8c605b60
RBP: 0000000000000000 R08: ffffffff8b7fc3e1 R09: 1ffffffff26e5300
R10: dffffc0000000000 R11: fffffbfff26e5301 R12: ffff88806cb8ccc0
R13: 00000000000000f4 R14: ffff888020630ac0 R15: dffffc0000000000
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:syz-executor    state:R  running task     stack:24656 pid:14093 tgid:14093 ppid:5214   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:867 [inline]
RIP: 0010:page_ext_put+0x16/0xc0 mm/page_ext.c:560
Code: 0a ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 53 48 89 fb e8 f3 8d 8d ff 48 85 db 0f 84 93 00 00 00 <e8> 75 83 af 09 89 c3 31 ff 89 c6 e8 1a 92 8d ff 85 db 74 10 e8 31
RSP: 0018:ffffc9000cb97730 EFLAGS: 00000286
RAX: ffffffff8205d87d RBX: ffff888018c2b250 RCX: ffff88802a110000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888018c2b250
RBP: ffffc9000cb97830 R08: ffffffff8204285b R09: 1ffff1100318564a
R10: dffffc0000000000 R11: ffffed100318564b R12: 0000000000000001
R13: 0000000000000001 R14: ffff888018c2b278 R15: ffff888018c2b2a0
 __set_page_owner+0x3f0/0x800 mm/page_owner.c:328
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493
 prep_new_page mm/page_alloc.c:1501 [inline]
 get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3442
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4700
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2263
 vm_area_alloc_pages mm/vmalloc.c:3584 [inline]
 __vmalloc_area_node mm/vmalloc.c:3660 [inline]
 __vmalloc_node_range_noprof+0x971/0x1460 mm/vmalloc.c:3841
 vmalloc_user_noprof+0x74/0x80 mm/vmalloc.c:3995
 kcov_ioctl+0x59/0x640 kernel/kcov.c:706
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfe/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f981a376fbb
RSP: 002b:00007ffda3b7d610 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000040000 RCX: 00007f981a376fbb
RDX: 0000000000040000 RSI: ffffffff80086301 RDI: 00000000000000e0
RBP: 00007f981a5066d8 R08: 00000000000000da R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009
 </TASK>
rcu: rcu_preempt kthread starved for 8783 jiffies! g110677 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:25232 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/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 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111