rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10615 ticks this GP) idle=282/1/0x4000000000000002 softirq=79047/79049 fqs=5197 
rcu: 	 (t=10500 jiffies g=104425 q=22)
NMI backtrace for cpu 0
CPU: 0 PID: 18299 Comm: syz-executor.5 Not tainted 5.1.0-rc2 #36
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:__generic_file_write_iter+0x14b/0x630 mm/filemap.c:3373
Code: 89 45 d0 e8 67 90 e4 ff 49 8d bf 20 10 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 19 04 00 00 <48> 8b 45 d0 4c 89 e7 49 89 87 20 10 00 00 e8 c2 62 2c 00 31 ff 4c
RSP: 0018:ffff88804f2cf660 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff88804f2cf7d8 RCX: ffffc90010ec7000
RDX: 1ffff1100a3792b4 RSI: ffffffff818be119 RDI: ffff888051bc95a0
RBP: ffff88804f2cf6a8 R08: ffff888051bc8580 R09: ffffffff895e5c54
R10: ffff888051bc8e28 R11: ffff888051bc8580 R12: ffff8880a54c90c0
R13: ffff8880497a6640 R14: ffff8880497a6840 R15: ffff888051bc8580
 generic_file_write_iter+0x360/0x610 mm/filemap.c:3460
 call_write_iter include/linux/fs.h:1863 [inline]
 do_iter_readv_writev+0x5e1/0x8e0 fs/read_write.c:680
 do_iter_write fs/read_write.c:956 [inline]
 do_iter_write+0x184/0x610 fs/read_write.c:937
 vfs_iter_write+0x77/0xb0 fs/read_write.c:969
 iter_file_splice_write+0x662/0xbe0 fs/splice.c:745
 do_splice_from fs/splice.c:847 [inline]
 direct_splice_actor+0x126/0x1a0 fs/splice.c:1019
 splice_direct_to_actor+0x369/0x970 fs/splice.c:974
 do_splice_direct+0x1da/0x2a0 fs/splice.c:1062
 do_sendfile+0x597/0xd00 fs/read_write.c:1442
 __do_sys_sendfile64 fs/read_write.c:1497 [inline]
 __se_sys_sendfile64 fs/read_write.c:1489 [inline]
 __x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1489
 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:00007f8754f68c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000458209
RDX: 0000000020000000 RSI: 0000000000000007 RDI: 0000000000000007
RBP: 000000000073c0e0 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00007f8754f696d4
R13: 00000000004c5135 R14: 00000000004d8ea8 R15: 00000000ffffffff