rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11599/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=42661, q=678876 ncpus=2)
task:syz.2.1481      state:R  running task     stack:26824 pid:11599 tgid:11598 ppid:5862   task_flags:0x40054c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x16fd/0x4cf0 kernel/sched/core.c:6786
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7109
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:869 [inline]
RIP: 0010:class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
RIP: 0010:unwind_next_frame+0x1967/0x2390 arch/x86/kernel/unwind_orc.c:680
Code: 8b 64 24 20 41 0f b6 04 2c 84 c0 0f 85 2d 03 00 00 41 c7 06 00 00 00 00 31 db e8 44 dc fa 09 85 c0 74 3a e8 eb 67 34 00 84 c0 <75> 31 e8 32 dc fa 09 85 c0 74 28 80 3d 0c db 18 0e 00 75 1f c6 05
RSP: 0018:ffffc9000c097538 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff90d8cb01 RCX: 8ebcfb64c9d9db00
RDX: ffffc9000c097601 RSI: ffffffff8be28ce0 RDI: ffffffff8be28ca0
RBP: dffffc0000000000 R08: ffffc9000c097f48 R09: ffffc9000c097658
R10: dffffc0000000000 R11: fffff52001812ecd R12: ffffc9000c097f58
R13: ffffc9000c090000 R14: ffffc9000c097608 R15: ffffffff8172aae5
 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:1248 [inline]
 __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706
 vfree+0x25a/0x400 mm/vmalloc.c:3434
 kcov_put kernel/kcov.c:439 [inline]
 kcov_close+0x28/0x50 kernel/kcov.c:535
 __fput+0x44c/0xa70 fs/file_table.c:465
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x22e0 kernel/exit.c:964
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105
 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:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf71f8e9a9
RSP: 002b:00007faf72eb40e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007faf721b5fa8 RCX: 00007faf71f8e9a9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007faf721b5fa8
RBP: 00007faf721b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007faf721b5fac
R13: 0000000000000000 R14: 00007fffff0751c0 R15: 00007fffff0752a8
 </TASK>