rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6001/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=11657, q=2066 ncpus=2)
task:syz.2.20        state:R  running task     stack:28392 pid:6001  tgid:5987  ppid:5839   task_flags:0x400040 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:unwind_next_frame+0x127/0x23c0 arch/x86/kernel/unwind_orc.c:498
Code: 48 c7 c2 20 a3 c9 8b e8 87 4a 2b 00 4c 89 6c 24 78 48 89 5c 24 70 4d 8d 6e 50 4c 89 e8 48 c1 e8 03 48 89 44 24 38 80 3c 28 00 <74> 08 4c 89 ef e8 af 3a b9 00 49 8b 5d 00 48 85 db 74 23 48 81 c3
RSP: 0018:ffffc90004a2f518 EFLAGS: 00000246
RAX: 1ffff92000945ed3 RBX: ffffffff8176a337 RCX: 0000000080000001
RDX: 000000006f56b93f RSI: ffffffff8c27a860 RDI: ffffffff8c27a820
RBP: dffffc0000000000 R08: ffffffff81767a45 R09: ffffffff8e7602e0
R10: ffffc90004a2f648 R11: fffff52000945ed5 R12: 1ffff92000945ec9
R13: ffffc90004a2f698 R14: ffffc90004a2f648 R15: ffffffff81767a45
 __unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:773
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 save_stack+0x122/0x230 mm/page_owner.c:165
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
 __slab_free+0x263/0x2b0 mm/slub.c:5532
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:406
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5219 [inline]
 __kmalloc_noprof+0x35c/0x760 mm/slub.c:5231
 kmalloc_noprof include/linux/slab.h:966 [inline]
 kzalloc_noprof include/linux/slab.h:1204 [inline]
 tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
 tomoyo_encode+0x28b/0x550 security/tomoyo/realpath.c:80
 tomoyo_realpath_from_path+0x58d/0x5d0 security/tomoyo/realpath.c:283
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_number_perm+0x246/0x630 security/tomoyo/file.c:728
 security_file_ioctl+0xc3/0x2a0 security/security.c:2435
 __do_sys_ioctl fs/ioctl.c:591 [inline]
 __se_sys_ioctl+0x47/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fba5879c2bb
RSP: 002b:00007fba59651050 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fba58a163f8 RCX: 00007fba5879c2bb
RDX: 0000000000000000 RSI: 0000000000006364 RDI: 00000000000000dc
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fba596516c0
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fba58a163f8 R14: 00007fba58b3f960 R15: 00007fba58b3fa48
 </TASK>