rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P20082/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=177325, q=601 ncpus=1)
task:syz.3.5257      state:R  running task     stack:23512 pid:20082 tgid:20079 ppid:5618   task_flags:0x40054c flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0xa00 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:869 [inline]
RIP: 0010:pte_unmap include/linux/pgtable.h:117 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1964 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:2020 [inline]
RIP: 0010:zap_pud_range mm/memory.c:2048 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:2069 [inline]
RIP: 0010:__zap_vma_range+0x16f7/0x4a30 mm/memory.c:2109
Code: b6 9c 24 2c 01 00 00 31 ff 89 de e8 e3 85 ab ff 84 db 0f 85 5f 0b 00 00 e8 c6 8b ab ff 48 8b bc 24 50 01 00 00 e8 39 51 5f 09 <e8> c4 5b 5c 09 31 ff 89 c3 89 c6 e8 19 86 ab ff 85 db 0f 85 ce 0a
RSP: 0018:ffffc90005757560 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001
RBP: 0000000000000004 R08: 0000000000000000 R09: ffffed10092c8d20
R10: ffff888049646903 R11: 0000000000000000 R12: ffff88807d9afc18
R13: fffffbfff2245758 R14: 0000000000000000 R15: 00007fe37a9f9000
 unmap_vmas+0x299/0x5f0 mm/memory.c:2178
 exit_mmap+0x1ef/0xa00 mm/mmap.c:1300
 __mmput+0x12a/0x410 kernel/fork.c:1187
 mmput+0x67/0x80 kernel/fork.c:1210
 exit_mm kernel/exit.c:615 [inline]
 do_exit+0x8b1/0x2ae0 kernel/exit.c:997
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1152
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3046
 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe37b79e019
RSP: 002b:00007fe37c6500e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fe37ba25fa8 RCX: 00007fe37b79e019
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe37ba25fa8
RBP: 00007fe37ba25fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe37ba26038 R14: 00007fff597e9260 R15: 00007fff597e9348
 </TASK>