rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=53813, q=139 ncpus=1)
rcu: All QSes seen, last rcu_preempt kthread activity 8567 (4294988287-4294979720), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 8567 jiffies! g53813 f0x2 RCU_GP_DOING_FQS(6) ->state=R ->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:28488 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7284
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7606
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x920 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2333
Code: 03 48 89 44 24 10 48 c1 e9 03 48 89 4c 24 08 48 c7 c0 80 f2 a0 8f 48 c1 e8 03 48 89 04 24 4c 89 6c 24 18 eb 1c e8 f2 17 00 00 <66> c7 05 73 65 28 0e 07 00 e8 e4 29 00 00 66 c7 05 65 65 28 0e 08
RSP: 0018:ffffc9000029fd40 EFLAGS: 00000246
RAX: 86eafe2377dbb900 RBX: ffffc9000029fd80 RCX: ffffffff9ba00501
RDX: 0000000000000001 RSI: dffffc0000000000 RDI: 00000000ffffffff
RBP: ffffc9000029fe18 R08: ffffffff917a987f R09: 1ffffffff22f530f
R10: dffffc0000000000 R11: fffffbfff22f5310 R12: ffff88801c749000
R13: 1ffff92000053fac R14: ffffc9000029fd88 R15: dffffc0000000000
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 2943 Comm: kworker/R-bat_e Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: bat_events batadv_dat_purge
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 90 6c 47 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 a2 56 f3 12 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 ff 70 4a 0a cc 48 8d 3d 57 69 da
RSP: 0018:ffffc900022ffa00 EFLAGS: 00000296
RAX: 050ce2f9418dd100 RBX: 0000000000000001 RCX: 8000000000000201
RDX: 000000002e131db2 RSI: ffffffff8e6f54c2 RDI: ffffffff8c6dec80
RBP: ffff888040f92580 R08: ffffffff8bb31310 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff22f5310 R12: ffff88804104e118
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000246
FS:  0000000000000000(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000040021000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:182 [inline]
 _raw_spin_lock_bh+0x36/0x50 kernel/locking/spinlock.c:205
 spin_lock_bh include/linux/spinlock.h:353 [inline]
 __batadv_dat_purge net/batman-adv/distributed-arp-table.c:240 [inline]
 batadv_dat_purge+0xf0/0x3c0 net/batman-adv/distributed-arp-table.c:271
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 rescuer_thread+0x7c5/0x10e0 kernel/workqueue.c:3703
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>