rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10569 ticks this GP) idle=3ce/1/0x4000000000000002 softirq=72611/72613 fqs=5235 
	(t=10500 jiffies g=121829 q=678)
NMI backtrace for cpu 0
CPU: 0 PID: 1971 Comm: syz-executor.1 Not tainted 5.2.0-rc5-next-20190621 #20
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+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x22f/0x27f 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:2625 [inline]
 rcu_sched_clock_irq.cold+0x4d1/0xc13 kernel/rcu/tree.c:2161
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1296
 __run_hrtimer kernel/time/hrtimer.c:1388 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1450
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1508
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 smp_apic_timer_interrupt+0x12a/0x5b0 arch/x86/kernel/apic/apic.c:1066
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
 </IRQ>
RIP: 0010:put_page+0x0/0x130 include/linux/mm.h:1020
Code: 49 89 f5 41 54 49 89 fc 53 89 d3 e8 1a f7 e4 ff 89 da 4c 89 ee 4c 89 e7 e8 6d 3c ed ff 5b 41 5c 41 5d 5d c3 66 0f 1f 44 00 00 <55> 48 89 e5 41 55 41 54 49 89 fc 53 e8 ef f6 e4 ff 49 8d 7c 24 08
RSP: 0018:ffff888038dc78a8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000876 RBX: 0000000000000005 RCX: ffffc900083e0000
RDX: 0000000000040000 RSI: ffffffff833751ef RDI: ffffea0001f5e800
RBP: ffff888038dc7980 R08: 1ffffd40003ebd06 R09: fffff940003ebd07
R10: fffff940003ebd06 R11: ffffea0001f5e837 R12: ffffea0001f5e800
R13: 0000000000000005 R14: 0000000000000cec R15: dffffc0000000000
 ext4_file_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x1d6/0x420 fs/ext4/file.c:65
 call_read_iter include/linux/fs.h:1864 [inline]
 generic_file_splice_read+0x4af/0x800 fs/splice.c:307
 do_splice_to+0x127/0x180 fs/splice.c:877
 splice_direct_to_actor+0x2d2/0x970 fs/splice.c:954
 do_splice_direct+0x1da/0x2a0 fs/splice.c:1063
 do_sendfile+0x597/0xd00 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1519 [inline]
 __se_sys_sendfile64 fs/read_write.c:1511 [inline]
 __x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1511
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4592c9
Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fce245e5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004592c9
RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00007fce245e66d4
R13: 00000000004c689d R14: 00000000004db828 R15: 00000000ffffffff