rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=8a2/1/0x4000000000000000 softirq=37007/37007 fqs=0 
	(t=10500 jiffies g=54881 q=78)
rcu: rcu_preempt kthread starved for 10500 jiffies! g54881 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28896 pid:   10 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0x9b9/0xd20 kernel/sched/core.c:4527
NMI backtrace for cpu 0
CPU: 0 PID: 21772 Comm: syz-executor.4 Not tainted 5.9.0-rc4-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:77 [inline]
 dump_stack+0x1d6/0x29e lib/dump_stack.c:118
 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x199/0x2a0 kernel/rcu/tree_stall.h:318
 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 rcu_pending kernel/rcu/tree.c:3637 [inline]
 rcu_sched_clock_irq+0x1920/0x1eb0 kernel/rcu/tree.c:2519
 update_process_times+0x130/0x1b0 kernel/time/timer.c:1710
 tick_sched_handle kernel/time/tick-sched.c:176 [inline]
 tick_sched_timer+0x25e/0x410 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x42d/0x930 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0xf0/0x260 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0x94/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline]
RIP: 0010:smp_call_function_single+0x302/0x450 kernel/smp.c:382
Code: 2f 44 89 ee 83 e6 01 31 ff e8 4a 08 0b 00 41 83 e5 01 75 14 e8 2f 04 0b 00 eb 45 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f3 90 <42> 0f b6 04 23 84 c0 75 0d 41 f6 07 01 74 22 e8 0a 04 0b 00 eb e8
RSP: 0018:ffffc900054f7ca0 EFLAGS: 00000246
RAX: ffffffff8169f986 RBX: 1ffff92000a9ef99 RCX: 0000000000040000
RDX: ffffc90012669000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc900054f7d28 R08: ffffffff8169f956 R09: ffffed1015d26d11
R10: ffffed1015d26d11 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffffc900054f7cc8
 smp_call_function_many kernel/smp.c:577 [inline]
 smp_call_function kernel/smp.c:599 [inline]
 on_each_cpu+0x4d/0x1c0 kernel/smp.c:698
 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:876
 do_adjtimex+0x7a8/0x990 kernel/time/timekeeping.c:2368
 do_clock_adjtime kernel/time/posix-timers.c:1109 [inline]
 __do_sys_clock_adjtime kernel/time/posix-timers.c:1121 [inline]
 __se_sys_clock_adjtime kernel/time/posix-timers.c:1112 [inline]
 __x64_sys_clock_adjtime+0x17e/0x210 kernel/time/posix-timers.c:1112
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa7db512c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 0000000000001e00 RCX: 000000000045d5b9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000000
RBP: 000000000118cf78 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffec4aa686f R14: 00007fa7db5139c0 R15: 000000000118cf4c
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 287 Comm: kworker/u4:4 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:787 [inline]
RIP: 0010:lock_release+0x92/0x750 kernel/locking/lockdep.c:5022
Code: e8 03 42 80 3c 28 00 74 0c 48 c7 c7 b0 17 4d 89 e8 83 a6 5a 00 48 89 5c 24 40 48 83 3d 16 fc f2 07 00 0f 84 8b 06 00 00 9c 58 <0f> 1f 44 00 00 48 89 c3 48 c7 c0 c0 17 4d 89 48 c1 e8 03 42 80 3c
RSP: 0018:ffffc90000da8c80 EFLAGS: 00000086
RAX: 0000000000000086 RBX: ffffffff86a5543e RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff894fe4e0 RDI: 0000000000000086
RBP: ffff8880a8800080 R08: dffffc0000000000 R09: fffffbfff131e2e6
R10: fffffbfff131e2e6 R11: 0000000000000000 R12: ffff8880a8800964
R13: dffffc0000000000 R14: ffff88804d32db00 R15: 1ffff1101510012c
FS:  0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005641344272b8 CR3: 000000008e0c1000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline]
 _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:183
 spin_unlock include/linux/spinlock.h:394 [inline]
 advance_sched+0x6ce/0x8c0 net/sched/sch_taprio.c:748
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x47f/0x930 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0xf0/0x260 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0x94/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:arch_local_irq_save+0x2b/0x80 arch/x86/include/asm/paravirt.h:787
Code: 56 53 48 c7 c0 b0 17 4d 89 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 42 80 3c 30 00 74 0c 48 c7 c7 b0 17 4d 89 e8 b5 36 5b 00 <48> 83 3d 4d 8c f3 07 00 74 40 9c 58 0f 1f 44 00 00 48 89 c3 48 c7
RSP: 0018:ffffc90001be7b40 EFLAGS: 00000246
RAX: 1ffffffff129a2f6 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff894fe4e0
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff131e2e6
R10: fffffbfff131e2e6 R11: 0000000000000000 R12: ffff8880a8800080
R13: ffffffff894fe4e0 R14: dffffc0000000000 R15: 0000000000000170
 lock_is_held_type+0x2d/0xe0 kernel/locking/lockdep.c:5041
 lock_is_held include/linux/lockdep.h:267 [inline]
 rcu_read_lock_sched_held+0x2f/0xa0 kernel/rcu/update.c:136
 trace_lock_acquire+0x170/0x1d0 include/trace/events/lock.h:13
 lock_acquire+0x47/0x6f0 kernel/locking/lockdep.c:4980
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:241
 rcu_read_lock include/linux/rcupdate.h:634 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:407 [inline]
 batadv_nc_worker+0xc8/0x5c0 net/batman-adv/network-coding.c:718
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294