==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4882
Read of size 8 at addr ffff888012ff8a28 by task vhost-4718/4719

CPU: 0 PID: 4719 Comm: vhost-4718 Not tainted 5.15.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 print_address_description+0x63/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
 __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4882
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
 try_to_wake_up+0xae/0x1300 kernel/sched/core.c:4030
 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 __do_softirq+0x3b3/0x93a kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x155/0x240 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x81/0x290 mm/kasan/generic.c:189
Code: df 4f 8d 34 1a 4c 89 f5 4c 29 cd 48 83 fd 10 7f 26 48 85 ed 0f 84 3a 01 00 00 49 f7 d2 49 01 da 41 80 39 00 0f 85 c4 01 00 00 <49> ff c1 49 ff c2 75 ee e9 1d 01 00 00 45 89 cf 41 83 e7 07 0f 84
RSP: 0018:ffffc900043879b8 EFLAGS: 00000246
RAX: ffffffff87cb5701 RBX: 1ffff92000870f84 RCX: ffffffff87cb571a
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc90004387c20
RBP: 0000000000000002 R08: dffffc0000000000 R09: fffff52000870f85
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff888075355330
R13: dffffc0000000000 R14: fffff52000870f86 R15: dffffc0000000000
 memset+0x1f/0x40 mm/kasan/shadow.c:44
 vhost_get_vq_desc+0xda/0x29e0 drivers/vhost/vhost.c:2218
 vhost_transport_do_send_pkt+0x358/0x1290 drivers/vhost/vsock.c:131
 vhost_worker+0x209/0x330 drivers/vhost/vhost.c:372
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
 </TASK>

Allocated by task 2:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3220 [inline]
 kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
 alloc_task_struct_node kernel/fork.c:171 [inline]
 dup_task_struct+0x57/0xb60 kernel/fork.c:894
 copy_process+0x5eb/0x3ef0 kernel/fork.c:2038
 kernel_clone+0x210/0x960 kernel/fork.c:2604
 kernel_thread+0x168/0x1e0 kernel/fork.c:2656
 create_kthread kernel/kthread.c:357 [inline]
 kthreadd+0x57a/0x740 kernel/kthread.c:701
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300

Freed by task 4524:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1705 [inline]
 slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kmem_cache_free+0x91/0x1f0 mm/slub.c:3515
 rcu_do_batch kernel/rcu/tree.c:2523 [inline]
 rcu_core+0xa15/0x1650 kernel/rcu/tree.c:2763
 __do_softirq+0x3b3/0x93a kernel/softirq.c:558

Last potentially related work creation:
 kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:3007 [inline]
 call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087
 context_switch kernel/sched/core.c:5033 [inline]
 __schedule+0x12cc/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 nilfs_segctor_kill_thread fs/nilfs2/segment.c:2681 [inline]
 nilfs_segctor_destroy fs/nilfs2/segment.c:2763 [inline]
 nilfs_detach_log_writer+0x2e6/0xbd0 fs/nilfs2/segment.c:2852
 nilfs_put_super+0x49/0x150 fs/nilfs2/super.c:498
 generic_shutdown_super+0x136/0x2c0 fs/super.c:475
 kill_block_super+0x7a/0xe0 fs/super.c:1414
 deactivate_locked_super+0xa0/0x110 fs/super.c:335
 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
 task_work_run+0x129/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Second to last potentially related work creation:
 kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:3007 [inline]
 call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087
 context_switch kernel/sched/core.c:5033 [inline]
 __schedule+0x12cc/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 smpboot_thread_fn+0x599/0x9d0 kernel/smpboot.c:160
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300

The buggy address belongs to the object at ffff888012ff8000
 which belongs to the cache task_struct of size 7360
The buggy address is located 2600 bytes inside of
 7360-byte region [ffff888012ff8000, ffff888012ff9cc0)
The buggy address belongs to the page:
page:ffffea00004bfe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12ff8
head:ffffea00004bfe00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888022def641
flags: 0xfff80000010200(slab|head|node=0|zone=1|lastcpupid=0xfff)
raw: 00fff80000010200 dead000000000100 dead000000000122 ffff888011deb3c0
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888022def641
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2, ts 2402418437, free_ts 0
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
 __alloc_pages+0x272/0x700 mm/page_alloc.c:5423
 alloc_slab_page mm/slub.c:1775 [inline]
 allocate_slab mm/slub.c:1912 [inline]
 new_slab+0xbb/0x4b0 mm/slub.c:1975
 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
 __slab_alloc mm/slub.c:3095 [inline]
 slab_alloc_node mm/slub.c:3186 [inline]
 kmem_cache_alloc_node+0x1ba/0x2c0 mm/slub.c:3256
 alloc_task_struct_node kernel/fork.c:171 [inline]
 dup_task_struct+0x57/0xb60 kernel/fork.c:894
 copy_process+0x5eb/0x3ef0 kernel/fork.c:2038
 kernel_clone+0x210/0x960 kernel/fork.c:2604
 kernel_thread+0x168/0x1e0 kernel/fork.c:2656
 create_kthread kernel/kthread.c:357 [inline]
 kthreadd+0x57a/0x740 kernel/kthread.c:701
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888012ff8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888012ff8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888012ff8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888012ff8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888012ff8b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	df 4f 8d             	fisttps -0x73(%rdi)
   3:	34 1a                	xor    $0x1a,%al
   5:	4c 89 f5             	mov    %r14,%rbp
   8:	4c 29 cd             	sub    %r9,%rbp
   b:	48 83 fd 10          	cmp    $0x10,%rbp
   f:	7f 26                	jg     0x37
  11:	48 85 ed             	test   %rbp,%rbp
  14:	0f 84 3a 01 00 00    	je     0x154
  1a:	49 f7 d2             	not    %r10
  1d:	49 01 da             	add    %rbx,%r10
  20:	41 80 39 00          	cmpb   $0x0,(%r9)
  24:	0f 85 c4 01 00 00    	jne    0x1ee
* 2a:	49 ff c1             	inc    %r9 <-- trapping instruction
  2d:	49 ff c2             	inc    %r10
  30:	75 ee                	jne    0x20
  32:	e9 1d 01 00 00       	jmp    0x154
  37:	45 89 cf             	mov    %r9d,%r15d
  3a:	41 83 e7 07          	and    $0x7,%r15d
  3e:	0f                   	.byte 0xf
  3f:	84                   	.byte 0x84