rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7224/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=26309, q=436348 ncpus=2)
task:syz.4.456       state:R  running task     stack:25432 pid:7224  tgid:7222  ppid:5632   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1821/0x5740 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:539 [inline]
 irqentry_exit+0x14f/0x8b0 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline]
RIP: 0010:rcu_is_watching+0x9/0xb0 kernel/rcu/tree.c:751
Code: 43 03 eb cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 <65> ff 05 30 d3 8e 11 e8 cb 84 ff 09 89 c3 83 f8 08 73 65 49 bf 00
RSP: 0018:ffffc90002daeb38 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff8225bd04 RCX: ffff888031ac8000
RDX: 000000000f96849b RSI: ffffffff8e224255 RDI: ffffffff8c28a560
RBP: dffffc0000000000 R08: ffffffff8176e256 R09: ffffffff8e95cc20
R10: ffffc90002daec78 R11: ffffffff81b0e0e0 R12: ffffc90002daec60
R13: 1ffff920005b5d85 R14: ffffc90002daec28 R15: ffffffff8176e256
 rcu_read_lock include/linux/rcupdate.h:839 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
 unwind_next_frame+0xd5/0x2550 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4570 [inline]
 slab_alloc_node mm/slub.c:4899 [inline]
 kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4906
 kmem_alloc_batch lib/debugobjects.c:371 [inline]
 fill_pool+0x156/0x580 lib/debugobjects.c:420
 debug_objects_fill_pool lib/debugobjects.c:752 [inline]
 debug_object_activate+0x4a3/0x580 lib/debugobjects.c:841
 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline]
 __call_rcu_common kernel/rcu/tree.c:3116 [inline]
 call_rcu+0x43/0x890 kernel/rcu/tree.c:3251
 __slab_free+0x274/0x2c0 mm/slub.c:5613
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4570 [inline]
 slab_alloc_node mm/slub.c:4899 [inline]
 kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4918
 shmem_alloc_inode+0x28/0x40 mm/shmem.c:5159
 alloc_inode+0x6a/0x1b0 fs/inode.c:345
 new_inode+0x22/0x170 fs/inode.c:1179
 __shmem_get_inode mm/shmem.c:3076 [inline]
 shmem_get_inode+0x3cd/0xfd0 mm/shmem.c:3150
 __shmem_file_setup+0x20b/0x370 mm/shmem.c:5849
 shmem_kernel_file_setup mm/shmem.c:5880 [inline]
 __shmem_zero_setup mm/shmem.c:5921 [inline]
 shmem_zero_setup+0x90/0x130 mm/shmem.c:5931
 __mmap_new_vma mm/vma.c:2564 [inline]
 __mmap_region mm/vma.c:2771 [inline]
 mmap_region+0x1934/0x22a0 mm/vma.c:2857
 do_mmap+0xc39/0x10c0 mm/mmap.c:560
 vm_mmap_pgoff+0x2c9/0x4f0 mm/util.c:581
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6f7e59ce59
RSP: 002b:00007f6f7f3d2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f6f7e816090 RCX: 00007f6f7e59ce59
RDX: 0000000003000007 RSI: 0000000000fbe000 RDI: 0000200000000000
RBP: 00007f6f7e632d6f R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6f7e816128 R14: 00007f6f7e816090 R15: 00007fff0cffc5f8
 </TASK>