rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=036/1/0x4000000000000000 softirq=64521/64525 fqs=1 
	(t=10500 jiffies g=113125 q=205)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10496 jiffies! g113125 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=38514
rcu: rcu_preempt kthread starved for 10497 jiffies! g113125 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:29168 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4322 [inline]
 __schedule+0x911/0x21b0 kernel/sched/core.c:5073
 schedule+0xcf/0x270 kernel/sched/core.c:5152
 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892
 rcu_gp_fqs_loop kernel/rcu/tree.c:2005 [inline]
 rcu_gp_kthread+0xd07/0x2250 kernel/rcu/tree.c:2178
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 25 Comm: kworker/u4:1 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:90 [inline]
RIP: 0010:kvm_wait arch/x86/kernel/kvm.c:854 [inline]
RIP: 0010:kvm_wait+0xb2/0x100 arch/x86/kernel/kvm.c:837
Code: 89 74 24 0c 48 89 3c 24 e8 5b c6 47 00 8b 74 24 0c 48 8b 3c 24 eb 82 e8 7c cb 47 00 e9 07 00 00 00 0f 00 2d a0 98 36 08 fb f4 <eb> 98 e9 07 00 00 00 0f 00 2d 90 98 36 08 f4 eb bf 89 74 24 0c 48
RSP: 0018:ffffc90000dff9f8 EFLAGS: 00000202
RAX: 00000000015597c8 RBX: 0000000000000000 RCX: 1ffffffff1f5e132
RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000
RBP: ffff888062dd52a8 R08: 0000000000000001 R09: ffffffff8fa9a987
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffffed100c5baa55 R14: 0000000000000001 R15: ffff8880b9c35f40
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31422000 CR3: 000000005a1fe000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 pv_wait arch/x86/include/asm/paravirt.h:564 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x8b8/0xb40 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock+0x200/0x2b0 kernel/locking/spinlock_debug.c:113
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 batadv_tt_local_commit_changes+0x1a/0x30 net/batman-adv/translation-table.c:3748
 batadv_iv_ogm_schedule_buff+0x117e/0x1410 net/batman-adv/bat_iv_ogm.c:811
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline]
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x675/0x920 net/batman-adv/bat_iv_ogm.c:1723
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
NMI backtrace for cpu 1
CPU: 1 PID: 29785 Comm: syz-executor.4 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x222/0x2a7 kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:622 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:697 [inline]
 rcu_pending kernel/rcu/tree.c:3830 [inline]
 rcu_sched_clock_irq.cold+0x4f7/0x11dd kernel/rcu/tree.c:2650
 update_process_times+0x16d/0x200 kernel/time/timer.c:1796
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197
Code: f0 4d 89 03 e9 f2 fc ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 40 00 <65> 8b 05 39 fe 8d 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc90002aa76b8 EFLAGS: 00000246
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc9001208d000
RDX: 0000000000040000 RSI: ffffffff815c0bbf RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8fa9a8a7
R10: ffffffff815c0bb5 R11: 0000000000000000 R12: ffffffff84b293d0
R13: 0000000000000200 R14: dffffc0000000000 R15: ffffc90002aa7718
 console_unlock+0x805/0xc80 kernel/printk/printk.c:2586
 vprintk_emit+0x1ca/0x560 kernel/printk/printk.c:2098
 vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:401
 printk+0xba/0xed kernel/printk/printk.c:2146
 batadv_tt_local_resize_to_mtu.cold+0x17/0x1c net/batman-adv/translation-table.c:3992
 batadv_update_min_mtu net/batman-adv/hard-interface.c:628 [inline]
 batadv_hard_if_event+0x67d/0x14f0 net/batman-adv/hard-interface.c:1020
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2075
 call_netdevice_notifiers_mtu net/core/dev.c:2124 [inline]
 dev_set_mtu_ext+0x397/0x5a0 net/core/dev.c:8830
 dev_set_mtu+0x8e/0x120 net/core/dev.c:8851
 dev_ifsioc+0x49f/0xa60 net/core/dev_ioctl.c:261
 dev_ioctl+0x1ad/0xb70 net/core/dev_ioctl.c:505
 sock_do_ioctl+0x148/0x2d0 net/socket.c:1062
 sock_ioctl+0x477/0x6a0 net/socket.c:1179
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f81504aa188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: 0000000020000000 RSI: 0000000000008922 RDI: 0000000000000003
RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffdeea55e0f R14: 00007f81504aa300 R15: 0000000000022000