syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P29310/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=205037, q=1644 ncpus=2)
task:syz.4.6903      state:R  running task     stack:24584 pid:29310 tgid:29298 ppid:20302  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5354 [inline]
 __schedule+0x165c/0x5520 kernel/sched/core.c:6966
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7294
 irqentry_exit+0x5e4/0x700 kernel/entry/common.c:240
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x19a0/0x2550 arch/x86/kernel/unwind_orc.c:677
Code: b6 04 28 84 c0 0f 85 aa 0a 00 00 49 0f bf 04 24 48 01 c6 4c 89 f7 48 89 da eb 3f 48 8d 5f 02 48 83 c7 03 48 89 d8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 a1 0a 00 00 48 89 f8 48 c1 e8 03 0f b6 04
RSP: 0018:ffffc90006b6f198 EFLAGS: 00000a07
RAX: 1ffffffff21ad43f RBX: ffffffff90d6a1fe RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90d6a1ff
RBP: dffffc0000000000 R08: ffffc90006b6f2c7 R09: 0000000000000000
R10: ffffc90006b6f2b8 R11: fffff52000d6de59 R12: ffffc90006b6f590
R13: 1ffff92000d6de4f R14: ffffc90006b6f268 R15: 1ffffffff21ad440
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 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:1392 [inline]
 __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2933
 __slab_free+0x274/0x2c0 mm/slub.c:5605
 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:4569 [inline]
 slab_alloc_node mm/slub.c:4898 [inline]
 kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4905
 lsm_file_alloc security/security.c:170 [inline]
 security_file_alloc+0x34/0x310 security/security.c:2381
 init_file+0x90/0x2b0 fs/file_table.c:159
 alloc_empty_file+0x6e/0x1d0 fs/file_table.c:241
 alloc_file fs/file_table.c:355 [inline]
 alloc_file_pseudo+0x155/0x240 fs/file_table.c:384
 __anon_inode_getfile fs/anon_inodes.c:166 [inline]
 __anon_inode_getfd fs/anon_inodes.c:283 [inline]
 anon_inode_getfd+0xc8/0x1f0 fs/anon_inodes.c:307
 create_vcpu_fd+0xd5/0x140 virt/kvm/kvm_main.c:4123
 kvm_vm_ioctl_create_vcpu+0x5d9/0x930 virt/kvm/kvm_main.c:4243
 kvm_vm_ioctl+0x893/0xd50 virt/kvm/kvm_main.c:5167
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd62519c799
RSP: 002b:00007fd62604b028 EFLAGS: 00000246
 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd625416270 RCX: 00007fd62519c799
RDX: 0000000000000001 RSI: 000000000000ae41 RDI: 000000000000000a
RBP: 00007fd625232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd625416308 R14: 00007fd625416270 R15: 00007ffd8dee3138
 </TASK>