TITLE: INFO: rcu detected stall in perf_mmap

[  323.391020] INFO: rcu_sched self-detected stall on CPU
[  323.396363] 	1-...: (64999 ticks this GP) idle=97a/140000000000001/0 softirq=7370/7370 fqs=16241 
[  323.405345] 	 (t=65000 jiffies g=4163 c=4162 q=64)
[  323.410286] NMI backtrace for cpu 1
[  323.413913] CPU: 1 PID: 1885 Comm: syz-executor921 Not tainted 4.14.49+ #8
[  323.420908] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  323.430246] Call Trace:
[  323.432801]  <IRQ>
[  323.434933]  dump_stack+0x114/0x1cf
[  323.457051]  nmi_cpu_backtrace.cold.2+0x19/0x95
[  323.471164]  nmi_trigger_cpumask_backtrace+0x102/0x143
[  323.476417]  arch_trigger_cpumask_backtrace+0x19/0x20
[  323.481585]  rcu_dump_cpu_stacks+0x177/0x1c4
[  323.485974]  check_cpu_stall.isra.56.cold.74+0x289/0x4c3
[  323.569083]  rcu_check_callbacks+0x2e4/0xe20
[  323.620799]  update_process_times+0x35/0x70
[  323.625119]  tick_sched_handle+0x8a/0x150
[  323.629243]  tick_sched_timer+0x47/0x120
[  323.637661]  __hrtimer_run_queues+0x4ea/0x1150
[  323.715212]  hrtimer_interrupt+0x1b1/0x5b0
[  323.719432]  smp_apic_timer_interrupt+0x1f9/0x870
[  323.756898]  apic_timer_interrupt+0x8e/0xa0
[  323.761194]  </IRQ>
[  323.763409] RIP: 0010:lock_is_held_type+0x115/0x160
[  323.768396] RSP: 0018:ffff8801c5abf228 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
[  323.776082] RAX: 0000000000000000 RBX: 1ffff10038b57e46 RCX: 0000000000000000
[  323.783326] RDX: 0000000000000000 RSI: ffffffff83efc6c0 RDI: 0000000000000246
[  323.790578] RBP: ffff8801c5abf2b0 R08: ffffffff81566839 R09: ffffffff8518b320
[  323.797822] R10: ffff8801c5abf700 R11: 0000000000000000 R12: 0000000000000000
[  323.805074] R13: ffffffff8385a220 R14: 00000000000002eb R15: 0000000000000000
[  323.832368]  __might_sleep+0x9a/0x190
[  323.848601]  __mutex_lock+0x143/0x19c0
[  323.917528]  mutex_lock_nested+0x1b/0x20
[  323.925769]  perf_mmap+0x689/0x17f0
[  323.969686]  mmap_region+0xba0/0x1660
[  323.998425]  do_mmap+0x730/0xea0
[  324.018118]  vm_mmap_pgoff+0x1e3/0x270
[  324.033674]  SyS_mmap_pgoff+0x46d/0x630
[  324.055175]  SyS_mmap+0x1b/0x30
[  324.058439]  do_syscall_64+0x251/0x750
[  324.087114]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[  324.092288] RIP: 0033:0x445e09
[  324.095451] RSP: 002b:00007eff4d398d98 EFLAGS: 00000212 ORIG_RAX: 0000000000000009
[  324.103133] RAX: ffffffffffffffda RBX: 00000000006dac5c RCX: 0000000000445e09
[  324.110376] RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00000000201bf000
[  324.117619] RBP: 00000000006dac58 R08: 0000000000000301 R09: 0000000000000000
[  324.124872] R10: 0080000000004011 R11: 0000000000000212 R12: 7479625f6e695f65
[  324.132116] R13: 676173752e424d32 R14: 2e626c7465677568 R15: 0000000000000009