rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P25558/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=101925, q=640256 ncpus=2)
task:syz.4.8148      state:R  running task     stack:26888 pid:25558 tgid:25557 ppid:14306  task_flags:0x40054c flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock+0x3f/0x50
 unmap_page_range+0x3a79/0x4370
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb0d378ec29
RSP: 002b:00007fb0d46ac038 EFLAGS: 00000246 ORIG_RAX: 00000000000000cb
RAX: 0000000000000000 RBX: 00007fb0d39d5fa0 RCX: 00007fb0d378ec29
RDX: 00002000000002c0 RSI: 0000000000000008 RDI: 0000000000000000
RBP: 00007fb0d3811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb0d39d6038 R14: 00007fb0d39d5fa0 R15: 00007fffebc07d98
 </TASK>
