rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10584/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=31997, q=841239 ncpus=2)
task:syz.4.1322      state:R  running task     stack:26664 pid:10584 tgid:10584 ppid:5825   task_flags:0x40044c flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5264 [inline]
 __schedule+0x1848/0x4ec0 kernel/sched/core.c:6872
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7199
 irqentry_exit+0x5b5/0x640 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 9b 9e d7 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90003bef248 EFLAGS: 00000206
RAX: 49a4e91563fc4400 RBX: 0000000000000000 RCX: 49a4e91563fc4400
RDX: 0000000000000000 RSI: ffffffff8d96e376 RDI: ffffffff8bbf41e0
RBP: ffffffff82143c09 R08: 0000000000000000 R09: ffffffff82143c09
R10: ffffc90003bef580 R11: fffff5200077deb2 R12: 0000000000000002
R13: ffffffff8df3b720 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 ___pte_offset_map+0x45/0x240 mm/pgtable-generic.c:288
 __pte_offset_map include/linux/mm.h:3169 [inline]
 __pte_offset_map_lock+0x46/0x210 mm/pgtable-generic.c:399
 pte_offset_map_lock include/linux/mm.h:3184 [inline]
 zap_pte_range mm/memory.c:1844 [inline]
 zap_pmd_range mm/memory.c:1950 [inline]
 zap_pud_range mm/memory.c:1979 [inline]
 zap_p4d_range mm/memory.c:2000 [inline]
 unmap_page_range+0xbe4/0x4140 mm/memory.c:2021
 unmap_single_vma mm/memory.c:2064 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:2108
 exit_mmap+0x240/0xb40 mm/mmap.c:1277
 __mmput+0x118/0x430 kernel/fork.c:1132
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x650/0x2300 kernel/exit.c:958
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1111
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e9/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb2fcb8f6c9
RSP: 002b:00007fff146f4ab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fb2fcde5fa8 RCX: 00007fb2fcb8f6c9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fb2fcde5fa8
RBP: 0000000000000000 R08: 0000000000000020 R09: 00000006146f4daf
R10: 00007fb2fcde5fa0 R11: 0000000000000246 R12: 00007fb2fcde5fac
R13: 00007fb2fcde5fa0 R14: 0000000000001a3d R15: 0000000000000006
 </TASK>