hrtimer: interrupt took 47971 ns
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=546/1/0x4000000000000002 softirq=14137/14138 fqs=5244 
rcu: 	 (t=10500 jiffies g=5469 q=1)
NMI backtrace for cpu 1
CPU: 1 PID: 7902 Comm: syz-executor623 Not tainted 5.0.0-rc7+ #79
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:1211
 print_cpu_stall kernel/rcu/tree.c:1348 [inline]
 check_cpu_stall kernel/rcu/tree.c:1422 [inline]
 rcu_pending kernel/rcu/tree.c:3018 [inline]
 rcu_check_callbacks.cold+0x500/0xa4a kernel/rcu/tree.c:2521
 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:preempt_count_sub+0x7/0x160 kernel/sched/core.c:3225
Code: d2 fb ff ff 89 4d d0 e8 37 2e 59 00 8b 4d d0 e9 65 fe ff ff 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 c7 c0 a0 6a 55 8a <55> 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 89 e5 53 83 e0 07 48
RSP: 0018:ffff888090f875e8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: ffffffff8a556aa0 RBX: 0000000000000002 RCX: 1ffffffff10dcc0d
RDX: 1ffffffff1134d2d RSI: ffffffff832b0978 RDI: 0000000000000001
RBP: ffff888090f87608 R08: ffff88809058a240 R09: ffffed1015d25bd0
R10: ffffed1015d25bcf R11: ffff8880ae92de7b R12: ffffffff889a6900
R13: ffff888090f876f8 R14: ffffea0002114800 R15: ffff888096c89ab8
 rcu_read_lock_held+0x8a/0xd0 kernel/rcu/update.c:279
 xa_entry include/linux/xarray.h:1004 [inline]
 xas_reload include/linux/xarray.h:1363 [inline]
 find_get_entry+0x71d/0x8d0 mm/filemap.c:1501
 pagecache_get_page+0x4a/0x740 mm/filemap.c:1579
 find_get_page include/linux/pagemap.h:272 [inline]
 generic_file_buffered_read mm/filemap.c:2076 [inline]
 generic_file_read_iter+0x716/0x2870 mm/filemap.c:2350
 ext4_file_read_iter+0x180/0x3c0 fs/ext4/file.c:77
 call_read_iter include/linux/fs.h:1857 [inline]
 generic_file_splice_read+0x4b2/0x800 fs/splice.c:308
 do_splice_to+0x12a/0x190 fs/splice.c:880
 splice_direct_to_actor+0x2d2/0x970 fs/splice.c:957
 do_splice_direct+0x1da/0x2a0 fs/splice.c:1066
 do_sendfile+0x597/0xd00 fs/read_write.c:1436
 __do_sys_sendfile64 fs/read_write.c:1491 [inline]
 __se_sys_sendfile64 fs/read_write.c:1483 [inline]
 __x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1483
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4401c9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe8c94ecc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401c9
RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00008080fffffffe R11: 0000000000000246 R12: 0000000000401a50
R13: 0000000000401ae0 R14: 0000000000000000 R15: 0000000000000000