rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P18283/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=167493, q=865779 ncpus=2)
task:syz.9.3622      state:R  running task     stack:25832 pid:18283 tgid:18281 ppid:17373  task_flags:0x40054c flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x17b4/0x5680 kernel/sched/core.c:7189
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
 irqentry_exit+0x14f/0x730 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x70 kernel/kcov.c:235
Code: a8 16 00 00 83 fa 02 75 21 48 8b 91 b0 16 00 00 48 8b 32 48 8d 7e 01 8b 89 ac 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 <e9> cf d7 e5 09 cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc900043b77e8 EFLAGS: 00000293
RAX: ffffffff823c7dcf RBX: 000000000004cf83 RCX: ffff88802e5edc40
RDX: 0000000000000000 RSI: ffffffff8c28adc0 RDI: 000000000004cf83
RBP: 0000000000000000 R08: ffffffff823abdde R09: ffffffff8e95cd60
R10: 000000000000000c R11: ffffffff81b0e910 R12: 000000000004cf83
R13: 0000000000000000 R14: 0000000000000000 R15: 000000d74974f43f
 _static_cpu_has arch/x86/include/asm/cpufeature.h:101 [inline]
 __nr_to_section include/linux/mmzone.h:2061 [inline]
 __pfn_to_section include/linux/mmzone.h:2198 [inline]
 lookup_page_ext mm/page_ext.c:255 [inline]
 page_ext_lookup+0x15f/0x180 mm/page_ext.c:513
 page_ext_iter_begin include/linux/page_ext.h:133 [inline]
 __update_page_owner_free_handle+0x103/0x470 mm/page_owner.c:284
 __reset_page_owner+0x85/0x1f0 mm/page_owner.c:321
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1402 [inline]
 __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943
 vfree+0x1d1/0x2f0 mm/vmalloc.c:3472
 kcov_put kernel/kcov.c:442 [inline]
 kcov_close+0x28/0x50 kernel/kcov.c:543
 __fput+0x44f/0xa60 fs/file_table.c:510
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x70f/0x22c0 kernel/exit.c:975
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1117
 get_signal+0x1284/0x1330 kernel/signal.c:3037
 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:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f99c039cdd9
RSP: 002b:00007f99be5f6028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: fffffffffffffffc RBX: 00007f99c0616090 RCX: 00007f99c039cdd9
RDX: 0000000000000017 RSI: 0000000000800000 RDI: 00002000000ec000
RBP: 00007f99c0432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f99c0616128 R14: 00007f99c0616090 R15: 00007f99c073fa48
 </TASK>