rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7987/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=25805, q=940293 ncpus=2)
task:syz.3.604       state:X  running task     stack:26824 pid:7987  tgid:7980  ppid:0      task_flags:0x40054c flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
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 1b 74 03 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90005447828 EFLAGS: 00000206
RAX: eb11f80f91f8d200 RBX: 0000000000000000 RCX: eb11f80f91f8d200
RDX: 0000000000000001 RSI: ffffffff8dba9bc5 RDI: ffffffff8be33f80
RBP: ffffffff825994db R08: 0000000000000000 R09: ffffffff825994db
R10: dffffc0000000000 R11: fffffbfff1f474e7 R12: 0000000000000002
R13: ffffffff8e13a120 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 proc_invalidate_siblings_dcache+0x4b/0x6c0 fs/proc/inode.c:113
 release_task+0x1306/0x17f0 kernel/exit.c:293
 exit_notify kernel/exit.c:778 [inline]
 do_exit+0x15f2/0x2300 kernel/exit.c:973
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 get_signal+0x1286/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2182f8db2a
RSP: 002b:00007f2183e09f90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000023 RCX: 00007f2182f8db2a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000a
RBP: 000000000000000a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f21831e6128 R14: 00007f21831e6090 R15: 00007f218330fa28
 </TASK>