rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11671/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=56353, q=631 ncpus=2)
task:syz.4.1601      state:R  running task     stack:26824 pid:11671 tgid:11665 ppid:5832   task_flags:0x40054c flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x17db/0x2390 arch/x86/kernel/unwind_orc.c:664
Code: 49 0f bf 04 24 48 01 c6 4c 89 f7 48 89 da e8 4c 0e 00 00 84 c0 0f 84 47 01 00 00 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24 20 <0f> b6 04 28 84 c0 0f 85 f4 08 00 00 b3 01 8b 84 24 84 00 00 00 41
RSP: 0018:ffffc9000ba97538 EFLAGS: 00000202
RAX: 1ffff92001752ec1 RBX: ffffffff90d2d91e RCX: 0000000000000001
RDX: ffffc9000ba97648 RSI: dffffc0000000000 RDI: ffffc9000ba97f38
RBP: dffffc0000000000 R08: ffffc9000ba97f38 R09: 0000000000000000
R10: ffffc9000ba97658 R11: fffff52001752ecd R12: ffffc9000ba97f38
R13: ffffc9000ba97658 R14: ffffc9000ba97608 R15: 1ffffffff21a5b24
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf5/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 kcov_put kernel/kcov.c:439 [inline]
 kcov_close+0x28/0x50 kernel/kcov.c:535
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x2300 kernel/exit.c:966
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x72/0x130 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/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9e0e78eec9
RSP: 002b:00007f9e0f658038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000000e8 RBX: 00007f9e0e9e6180 RCX: 00007f9e0e78eec9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007f9e0e811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9e0e9e6218 R14: 00007f9e0e9e6180 R15: 00007f9e0eb0fa28
 </TASK>