rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6865/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=14085, q=674 ncpus=2)
task:syz.1.185       state:R  running task     stack:24104 pid:6865  tgid:6834  ppid:5863   task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:121 [inline]
RIP: 0010:lock_release+0x70/0x3e0 kernel/locking/lockdep.c:5881
Code: e8 45 f1 08 00 84 c0 75 0d f6 05 be c3 ef 0d 01 0f 84 ad 02 00 00 83 3d 1d 0c 06 0e 00 0f 84 44 02 00 00 65 8b 05 d0 c3 02 11 <85> c0 0f 85 35 02 00 00 65 4c 8b 3c 25 08 f0 9f 92 41 83 bf ec 0a
RSP: 0018:ffffc90003acf3b8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 90b3fc4519e82d00
RDX: ffffc9000d79e000 RSI: ffffffff8be32660 RDI: ffffffff8be32620
RBP: ffff88801ca57af4 R08: ffff88801ca57ab7 R09: 1ffff1100394af56
R10: dffffc0000000000 R11: ffffed100394af57 R12: 00000000000477ed
R13: ffffffff822c755e R14: ffffffff8e139ee0 R15: ffff88801ca57b00
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 __update_page_owner_free_handle+0x452/0x470 mm/page_owner.c:283
 __reset_page_owner+0x85/0x1f0 mm/page_owner.c:309
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
 discard_slab mm/slub.c:2753 [inline]
 __put_partials+0x156/0x1a0 mm/slub.c:3218
 put_cpu_partial+0x17c/0x250 mm/slub.c:3293
 __slab_free+0x2d5/0x3c0 mm/slub.c:4550
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4180 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4236
 lsm_inode_alloc security/security.c:755 [inline]
 security_inode_alloc+0x39/0x330 security/security.c:1697
 inode_init_always_gfp+0x9ed/0xdc0 fs/inode.c:306
 inode_init_always include/linux/fs.h:3308 [inline]
 alloc_inode+0x82/0x1b0 fs/inode.c:353
 new_inode+0x22/0x170 fs/inode.c:1145
 debugfs_get_inode fs/debugfs/inode.c:72 [inline]
 __debugfs_create_file+0x14d/0x4f0 fs/debugfs/inode.c:432
 debugfs_create_file_full+0x3f/0x60 fs/debugfs/inode.c:459
 ref_tracker_dir_debugfs+0x14e/0x270 lib/ref_tracker.c:441
 ref_tracker_dir_init include/linux/ref_tracker.h:70 [inline]
 alloc_netdev_mqs+0x26f/0x1170 net/core/dev.c:11802
 loopback_net_init+0x3a/0x150 drivers/net/loopback.c:213
 ops_init+0x359/0x5c0 net/core/net_namespace.c:136
 setup_net+0x10c/0x320 net/core/net_namespace.c:438
 copy_net_ns+0x31b/0x4d0 net/core/net_namespace.c:570
 create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218
 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3127
 __do_sys_unshare kernel/fork.c:3198 [inline]
 __se_sys_unshare kernel/fork.c:3196 [inline]
 __x64_sys_unshare+0x38/0x50 kernel/fork.c:3196
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f54bcf8ebe9
RSP: 002b:00007f54bdeb3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f54bd1b6090 RCX: 00007f54bcf8ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000062040200
RBP: 00007f54bd011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f54bd1b6128 R14: 00007f54bd1b6090 R15: 00007ffc31d59af8
 </TASK>