rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10104/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=77253, q=1125384 ncpus=2)
task:syz.9.879       state:R  running task     stack:26784 pid:10104 tgid:10104 ppid:9515   task_flags:0x40044c flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1585/0x5340 kernel/sched/core.c:6907
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234
 irqentry_exit+0x599/0x620 kernel/entry/common.c:239
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline]
RIP: 0010:lock_acquire+0x50/0x2e0 kernel/locking/lockdep.c:5831
Code: 8b 05 54 32 a0 11 48 89 44 24 30 0f 1f 44 00 00 65 8b 05 57 32 a0 11 83 f8 08 0f 83 77 01 00 00 89 c0 48 0f a3 05 c0 ec 91 0e <73> 0d e8 e9 29 09 00 84 c0 0f 84 bc 01 00 00 83 3d ba 1f 92 0e 00
RSP: 0018:ffffc900039d7060 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffffff82142476 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e9602e0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900039d71f8 R11: ffffffff81b11670 R12: 0000000000000002
R13: ffffffff8e9602e0 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
 unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 slab_free_hook mm/slub.c:2648 [inline]
 slab_free mm/slub.c:6124 [inline]
 kmem_cache_free+0x426/0x630 mm/slub.c:6254
 anon_vma_free mm/rmap.c:137 [inline]
 __put_anon_vma+0x12b/0x2d0 mm/rmap.c:2889
 put_anon_vma mm/internal.h:215 [inline]
 unlink_anon_vmas+0x58b/0x730 mm/rmap.c:529
 free_pgtables+0x836/0xb70 mm/memory.c:427
 exit_mmap+0x490/0xa10 mm/mmap.c:1314
 __mmput+0x118/0x430 kernel/fork.c:1174
 exit_mm+0x168/0x220 kernel/exit.c:581
 do_exit+0x62e/0x2320 kernel/exit.c:959
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1112
 get_signal+0x1284/0x1330 kernel/signal.c:3034
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __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 include/linux/entry-common.h:325 [inline]
 ret_from_fork+0x59d/0xb90 arch/x86/kernel/process.c:167
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>