rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	3-....: (10500 ticks this GP) idle=e02/1/0x4000000000000004 softirq=26222/26222 fqs=4586 
	(t=10502 jiffies g=18909 q=722)
NMI backtrace for cpu 3
CPU: 3 PID: 15539 Comm: syz-executor.2 Not tainted 5.4.0-syzkaller #0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq.cold+0x509/0xc02 kernel/rcu/tree.c:2271
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x90/0xe0 kernel/locking/spinlock.c:191
Code: 48 c7 c0 58 34 13 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d ff 65 96 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 e1 a7 d3 f9 65 8b 05 12 50 85 78
RSP: 0018:ffff88807ed09a70 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff122668b RBX: 0000000000000282 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: ffff88807ed09a80 R08: 1ffffffff15377b3 R09: fffffbfff15377b4
R10: fffffbfff15377b3 R11: ffffffff8a9bbd9f R12: ffffffff8b7f2bc0
R13: 0000000000000282 R14: 0000000000000000 R15: 0000000000000003
 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline]
 __wake_up_common_lock+0xf8/0x150 kernel/sched/wait.c:125
 __wake_up+0xe/0x10 kernel/sched/wait.c:142
 aoenet_xmit+0x160/0x210 drivers/block/aoe/aoenet.c:123
 aoecmd_cfg+0x46a/0x640 drivers/block/aoe/aoecmd.c:1373
 discover_timer+0x4e/0x60 drivers/block/aoe/aoemain.c:24
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:66
Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01
RSP: 0018:ffff88800e4474c8 EFLAGS: 00010206 ORIG_RAX: ffffffffffffff13
RAX: dffffc00000000ff RBX: 0000000000000000 RCX: 0000000000000200
RDX: 0000000000000200 RSI: 00000000000000ff RDI: ffffed1003f18800
RBP: ffff88800e4474d0 R08: 1ffff11003f18800 R09: ffffed1003f18800
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00007e3100
R13: ffff88801f8c4000 R14: ffffea00007e3118 R15: ffffea00007e3100
 free_pages_prepare mm/page_alloc.c:1192 [inline]
 free_pcp_prepare+0x226/0x4f0 mm/page_alloc.c:1205
 free_unref_page_prepare mm/page_alloc.c:3022 [inline]
 free_unref_page_list+0xe1/0x800 mm/page_alloc.c:3091
 release_pages+0xf21/0x1bd0 mm/swap.c:842
 free_pages_and_swap_cache+0x2c3/0x3f0 mm/swap_state.c:296
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:184 [inline]
 tlb_flush_mmu+0x89/0x630 mm/mmu_gather.c:191
 zap_pte_range mm/memory.c:1140 [inline]
 zap_pmd_range mm/memory.c:1178 [inline]
 zap_pud_range mm/memory.c:1207 [inline]
 zap_p4d_range mm/memory.c:1228 [inline]
 unmap_page_range+0x1c61/0x2ac0 mm/memory.c:1249
 unmap_single_vma+0x19d/0x300 mm/memory.c:1294
 unmap_vmas+0x184/0x2f0 mm/memory.c:1326
 exit_mmap+0x2ba/0x530 mm/mmap.c:3161
 __mmput kernel/fork.c:1079 [inline]
 mmput+0x179/0x4d0 kernel/fork.c:1100
 exit_mm kernel/exit.c:485 [inline]
 do_exit+0x806/0x2ef0 kernel/exit.c:784
 do_group_exit+0x135/0x360 kernel/exit.c:895
 get_signal+0x47c/0x24f0 kernel/signal.c:2734
 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a759
Code: Bad RIP value.
RSP: 002b:00007f3d66074c88 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: 0000000000000006 RBX: 000000000071bf00 RCX: 000000000045a759
RDX: ffffffffffffffff RSI: 000000000000035d RDI: 000000002001d000
RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f3d660756d4
R13: 00000000004aec17 R14: 00000000006f1cb0 R15: 00000000ffffffff