rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5289/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=145473, q=952 ncpus=2)
task:syz.5.4826      state:R  running task     stack:24960 pid:5289  tgid:5289  ppid:31142  task_flags:0x40044c flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
 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:__orc_find arch/x86/kernel/unwind_orc.c:103 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:238 [inline]
RIP: 0010:unwind_next_frame+0x530/0x23c0 arch/x86/kernel/unwind_orc.c:510
Code: b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49 8d 47 fc 48 0f 47 d8 <4d> 0f 46 ef 48 39 dd 76 a2 e9 76 fd ff ff 44 89 f9 80 e1 07 80 c1
RSP: 0018:ffffc90005c2f318 EFLAGS: 00000287
RAX: ffffffff90321f38 RBX: ffffffff90321f3c RCX: ffffffff90321f40
RDX: ffffffff90321f3c RSI: ffffffff90b24f4c RDI: ffffffff8c27c1a0
RBP: ffffffff90321f40 R08: 0000000000000001 R09: ffffffff8e75e520
R10: ffffc90005c2f438 R11: ffffffff81b0c260 R12: ffffffff82190dc5
R13: ffffffff90321f3c R14: ffffc90005c2f3e8 R15: ffffffff90321f3c
 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:2646 [inline]
 slab_free mm/slub.c:6165 [inline]
 kmem_cache_free+0x426/0x630 mm/slub.c:6295
 tear_down_vmas+0x312/0x520 mm/mmap.c:1264
 exit_mmap+0x4b6/0xa10 mm/mmap.c:1322
 __mmput+0x118/0x430 kernel/fork.c:1175
 exit_mm+0x168/0x220 kernel/exit.c:581
 do_exit+0x6a2/0x23c0 kernel/exit.c:964
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
 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]
 do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fba18f9d589
RSP: 002b:00007fba1933f908 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3
RAX: fffffffffffffffc RBX: 00007fba18f58b20 RCX: 00007fba18f9d589
RDX: 00007fba18f58b20 RSI: 0000000000000058 RDI: 00007fba1933f960
RBP: 00007fba171f66c0 R08: 00007fba171f66c0 R09: 00007fba1933fa47
R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffe8
R13: 000000000000006e R14: 00007fba1933f960 R15: 00007fba1933fa48
 </TASK>