rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10451 ticks this GP) idle=f26/1/0x4000000000000002 softirq=661429/661429 fqs=10 
rcu: 	 (t=10500 jiffies g=635289 q=185)
rcu: rcu_preempt kthread starved for 10404 jiffies! g635289 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29168    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 schedule_timeout+0x4db/0xfd0 kernel/time/timer.c:1803
 rcu_gp_fqs_loop kernel/rcu/tree.c:1971 [inline]
 rcu_gp_kthread+0x962/0x17b0 kernel/rcu/tree.c:2128
 kthread+0x357/0x430 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 17196 Comm: syz-executor.3 Not tainted 5.1.0-rc1+ #33
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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1be/0x236 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.c:1223
 print_cpu_stall kernel/rcu/tree.c:1360 [inline]
 check_cpu_stall kernel/rcu/tree.c:1434 [inline]
 rcu_pending kernel/rcu/tree.c:3103 [inline]
 rcu_sched_clock_irq.cold+0x500/0xa4a kernel/rcu/tree.c:2544
 update_process_times+0x32/0x80 kernel/time/timer.c:1635
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:192
Code: c0 c0 96 92 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 75 4d 83 01 00 74 20 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 c2 76 3e fa 65 8b 05 2b a4 f2 78 85 c0 74 06 41
RSP: 0018:ffff88806d6e6ca8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11252d8 RBX: ffff88806d6e6da8 RCX: 1ffff1101485eda6
RDX: dffffc0000000000 RSI: ffff8880a42f6d10 RDI: ffff8880a42f6cbc
RBP: ffff88806d6e6cb0 R08: ffff8880a42f6440 R09: ffff8880a42f6d30
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88812ffffb80
R13: ffff888098cbcdc0 R14: ffff88806d6e6e28 R15: 0000000000000000
 spin_unlock_irq include/linux/spinlock.h:379 [inline]
 shrink_active_list+0x879/0x14c0 mm/vmscan.c:2142
 shrink_list mm/vmscan.c:2236 [inline]
 shrink_node_memcg+0x693/0x1450 mm/vmscan.c:2505
 shrink_node+0x29f/0x1570 mm/vmscan.c:2720
 shrink_zones mm/vmscan.c:2953 [inline]
 do_try_to_free_pages+0x3cb/0x11e0 mm/vmscan.c:3015
 try_to_free_mem_cgroup_pages+0x2dd/0xa30 mm/vmscan.c:3319
 try_charge+0x564/0x15c0 mm/memcontrol.c:2244
 mem_cgroup_try_charge+0x24d/0x5e0 mm/memcontrol.c:5918
 __add_to_page_cache_locked+0x425/0xe70 mm/filemap.c:833
 add_to_page_cache_lru+0x1f1/0x780 mm/filemap.c:909
 pagecache_get_page+0x36f/0x770 mm/filemap.c:1654
 grab_cache_page_write_begin+0x75/0xb0 mm/filemap.c:3249
 ext4_da_write_begin+0x2d7/0xec0 fs/ext4/inode.c:3071
 generic_perform_write+0x231/0x530 mm/filemap.c:3299
 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3428
 ext4_file_write_iter+0x346/0x11a0 fs/ext4/file.c:266
 call_write_iter include/linux/fs.h:1863 [inline]
 new_sync_write+0x4c7/0x760 fs/read_write.c:474
 __vfs_write+0xe4/0x110 fs/read_write.c:487
 vfs_write+0x20c/0x580 fs/read_write.c:549
 ksys_write+0xea/0x1f0 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458209
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3e9daa8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458209
RDX: 00000000fffffd97 RSI: 0000000020000180 RDI: 0000000000000005
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3e9daa96d4
R13: 00000000004c75b4 R14: 00000000004dd180 R15: 00000000ffffffff