rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=222/1/0x4000000000000002 softirq=134729/134730 fqs=5184 
rcu: 	 (t=10500 jiffies g=204969 q=1765)
NMI backtrace for cpu 1
CPU: 1 PID: 20409 Comm: syz-executor0 Not tainted 5.0.0-rc2-next-20190118 #15
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+0x1db/0x2d0 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:1234
 print_cpu_stall.cold+0x227/0x40c kernel/rcu/tree.c:1371
 check_cpu_stall kernel/rcu/tree.c:1445 [inline]
 rcu_pending kernel/rcu/tree.c:3114 [inline]
 rcu_sched_clock_irq+0xb32/0x1380 kernel/rcu/tree.c:2555
 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+0x3a7/0x1050 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+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:__read_once_size include/linux/compiler.h:197 [inline]
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline]
RIP: 0010:atomic_read include/generated/atomic-instrumented.h:27 [inline]
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs+0xb7/0x170 kernel/rcu/tree.c:309
Code: be 04 00 00 00 4d 8d b4 24 b8 00 00 00 4c 89 f7 e8 8e 6b 59 00 4c 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 <4c> 89 f0 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 77 49 8d 7d c0 41
RSP: 0018:ffff888062176bc8 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 1ffff1100c42ed7a RCX: ffffffff816cf852
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ae72dc78
RBP: ffff888062176c50 R08: 1ffff11015ce5b8f R09: ffffed1015ce5b90
R10: ffffed1015ce5b8f R11: ffff8880ae72dc7b R12: ffff8880ae72dbc0
R13: ffff888062176c30 R14: ffff8880ae72dc78 R15: dffffc0000000000
 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:955
 rcu_read_unlock include/linux/rcupdate.h:658 [inline]
 find_get_entry+0xc83/0x1090 mm/filemap.c:1506
 pagecache_get_page+0xe5/0x1070 mm/filemap.c:1582
 find_or_create_page include/linux/pagemap.h:323 [inline]
 grow_dev_page fs/buffer.c:947 [inline]
 grow_buffers fs/buffer.c:1029 [inline]
 __getblk_slow fs/buffer.c:1062 [inline]
 __getblk_gfp+0x4e2/0x1140 fs/buffer.c:1357
 __bread_gfp+0x2f/0x300 fs/buffer.c:1391
 sb_bread include/linux/buffer_head.h:307 [inline]
 fat__get_entry+0x586/0xa40 fs/fat/dir.c:101
 fat_get_entry fs/fat/dir.c:129 [inline]
 fat_search_long+0x345/0x17d0 fs/fat/dir.c:479
 vfat_find+0x10e/0x140 fs/fat/namei_vfat.c:697
 vfat_lookup+0x10a/0x6b0 fs/fat/namei_vfat.c:711
 lookup_open+0x726/0x1b80 fs/namei.c:3213
 do_last fs/namei.c:3324 [inline]
 path_openat+0x1983/0x5660 fs/namei.c:3534
 do_filp_open+0x26f/0x370 fs/namei.c:3564
 do_sys_open+0x59a/0x7c0 fs/open.c:1063
 ksys_open include/linux/syscalls.h:1301 [inline]
 __do_sys_creat fs/open.c:1121 [inline]
 __se_sys_creat fs/open.c:1119 [inline]
 __x64_sys_creat+0x61/0x80 fs/open.c:1119
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458099
Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd5d84bac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000458099
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200005c0
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd5d84bb6d4
R13: 00000000004be60a R14: 00000000004cec18 R15: 00000000ffffffff