==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2de0/0x3cb0 kernel/locking/lockdep.c:5007
Read of size 8 at addr ffff888022715818 by task syz.1.4257/13960

CPU: 0 UID: 0 PID: 13960 Comm: syz.1.4257 Not tainted 6.11.0-rc7-syzkaller-00097-g196145c606d0 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 __lock_acquire+0x2de0/0x3cb0 kernel/locking/lockdep.c:5007
 lock_acquire kernel/locking/lockdep.c:5759 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 p9_tag_remove net/9p/client.c:397 [inline]
 p9_req_put net/9p/client.c:405 [inline]
 p9_req_put+0xaf/0x250 net/9p/client.c:402
 req_done+0x1e7/0x2f0 net/9p/trans_virtio.c:147
 vring_interrupt drivers/virtio/virtio_ring.c:2595 [inline]
 vring_interrupt+0x31b/0x400 drivers/virtio/virtio_ring.c:2570
 __handle_irq_event_percpu+0x229/0x7c0 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
 handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
 handle_irq arch/x86/kernel/irq.c:247 [inline]
 call_irq_handler arch/x86/kernel/irq.c:259 [inline]
 __common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:285
 common_interrupt+0xab/0xd0 arch/x86/kernel/irq.c:278
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:974 [inline]
RIP: 0010:debug_check_no_obj_freed+0x354/0x600 lib/debugobjects.c:1020
Code: 35 d1 b2 8a 0b 7d 07 44 89 35 c8 b2 8a 0b 48 81 44 24 50 00 10 00 00 48 8b 74 24 20 48 8b 44 24 50 48 39 f0 0f 85 01 fe ff ff <48> 8b 5c 24 18 45 89 ee 44 3b 35 99 b2 8a 0b 7e 07 44 89 35 90 b2
RSP: 0018:ffffc9002354f620 EFLAGS: 00000246
RAX: ffff8880266d9000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffff8880266d9000 RDI: 0000000000000001
RBP: ffffc9002354f760 R08: 0000000000000001 R09: fffffbfff2d126e7
R10: ffffffff9689373f R11: 0000000000000000 R12: ffffffff9a3fa1e0
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880266d8a80
 slab_free_hook mm/slub.c:2223 [inline]
 slab_free mm/slub.c:4477 [inline]
 kmem_cache_free+0x26f/0x3a0 mm/slub.c:4552
 pagetable_pte_dtor include/linux/mm.h:2982 [inline]
 ___pte_free_tlb+0x1d/0x260 arch/x86/mm/pgtable.c:55
 __pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline]
 free_pte_range mm/memory.c:194 [inline]
 free_pmd_range mm/memory.c:212 [inline]
 free_pud_range mm/memory.c:246 [inline]
 free_p4d_range mm/memory.c:280 [inline]
 free_pgd_range+0x4e7/0xbc0 mm/memory.c:360
 free_pgtables+0x1c1/0x950 mm/memory.c:413
 exit_mmap+0x3c9/0xb20 mm/mmap.c:3423
 __mmput+0x12a/0x480 kernel/fork.c:1345
 mmput+0x62/0x70 kernel/fork.c:1367
 exit_mm kernel/exit.c:571 [inline]
 do_exit+0x9bf/0x2bb0 kernel/exit.c:869
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1031
 get_signal+0x2658/0x26d0 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fa6579
Code: Unable to access opcode bytes at 0xf7fa654f.
RSP: 002b:00000000f572660c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0
RAX: fffffffffffffe00 RBX: 00000000f7464f88 RCX: 0000000000000080
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f7464f8c
RBP: 0000000000000081 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 13963:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
 kmalloc_noprof include/linux/slab.h:681 [inline]
 p9_client_create+0xcf/0x11b0 net/9p/client.c:983
 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
 v9fs_mount+0xc6/0xa50 fs/9p/vfs_super.c:122
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1800
 do_new_mount fs/namespace.c:3472 [inline]
 path_mount+0x6e1/0x1f10 fs/namespace.c:3799
 do_mount fs/namespace.c:3812 [inline]
 __do_sys_mount fs/namespace.c:4020 [inline]
 __se_sys_mount fs/namespace.c:3997 [inline]
 __ia32_sys_mount+0x292/0x310 fs/namespace.c:3997
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Freed by task 13963:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240
 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2256 [inline]
 slab_free mm/slub.c:4477 [inline]
 kfree+0x12a/0x3b0 mm/slub.c:4598
 p9_client_create+0x9ca/0x11b0 net/9p/client.c:1054
 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
 v9fs_mount+0xc6/0xa50 fs/9p/vfs_super.c:122
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1800
 do_new_mount fs/namespace.c:3472 [inline]
 path_mount+0x6e1/0x1f10 fs/namespace.c:3799
 do_mount fs/namespace.c:3812 [inline]
 __do_sys_mount fs/namespace.c:4020 [inline]
 __se_sys_mount fs/namespace.c:3997 [inline]
 __ia32_sys_mount+0x292/0x310 fs/namespace.c:3997
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

The buggy address belongs to the object at ffff888022715800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 freed 512-byte region [ffff888022715800, ffff888022715a00)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22714
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000040 ffff88801ac42c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000
head: 00fff00000000040 ffff88801ac42c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000
head: 00fff00000000002 ffffea000089c501 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5653, tgid 5653 (syz-executor), ts 55756090169, free_ts 55615152373
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1500
 prep_new_page mm/page_alloc.c:1508 [inline]
 get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3446
 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4702
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x4e/0xf0 mm/slub.c:2325
 allocate_slab mm/slub.c:2488 [inline]
 new_slab+0x84/0x260 mm/slub.c:2541
 ___slab_alloc+0xdac/0x1870 mm/slub.c:3727
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3817
 __slab_alloc_node mm/slub.c:3870 [inline]
 slab_alloc_node mm/slub.c:4029 [inline]
 __kmalloc_cache_noprof+0x2c5/0x310 mm/slub.c:4188
 kmalloc_noprof include/linux/slab.h:681 [inline]
 kzalloc_noprof include/linux/slab.h:807 [inline]
 mca_alloc net/ipv6/mcast.c:880 [inline]
 __ipv6_dev_mc_inc+0x2b7/0xc10 net/ipv6/mcast.c:936
 ipv6_add_dev+0xa93/0x1400 net/ipv6/addrconf.c:468
 addrconf_notify+0x546/0x19d0 net/ipv6/addrconf.c:3653
 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1994
 call_netdevice_notifiers_extack net/core/dev.c:2032 [inline]
 call_netdevice_notifiers net/core/dev.c:2046 [inline]
 register_netdevice+0x1728/0x1e20 net/core/dev.c:10477
 register_netdev+0x2f/0x50 net/core/dev.c:10581
 ip6_tnl_init_net+0x28e/0x410 net/ipv6/ip6_tunnel.c:2267
page last free pid 112 tgid 112 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1101 [inline]
 free_unref_folios+0x9e9/0x1390 mm/page_alloc.c:2667
 shrink_folio_list+0x2c6c/0x41e0 mm/vmscan.c:1530
 evict_folios+0x6e0/0x1b30 mm/vmscan.c:4560
 try_to_shrink_lruvec+0x612/0x9b0 mm/vmscan.c:4755
 shrink_one+0x3e3/0x7b0 mm/vmscan.c:4793
 shrink_many mm/vmscan.c:4856 [inline]
 lru_gen_shrink_node mm/vmscan.c:4934 [inline]
 shrink_node+0x2452/0x39d0 mm/vmscan.c:5914
 kswapd_shrink_node mm/vmscan.c:6742 [inline]
 balance_pgdat+0xc19/0x18f0 mm/vmscan.c:6934
 kswapd+0x5ea/0xbf0 mm/vmscan.c:7203
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
 ffff888022715700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888022715780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888022715800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888022715880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888022715900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	35 d1 b2 8a 0b       	xor    $0xb8ab2d1,%eax
   5:	7d 07                	jge    0xe
   7:	44 89 35 c8 b2 8a 0b 	mov    %r14d,0xb8ab2c8(%rip)        # 0xb8ab2d6
   e:	48 81 44 24 50 00 10 	addq   $0x1000,0x50(%rsp)
  15:	00 00
  17:	48 8b 74 24 20       	mov    0x20(%rsp),%rsi
  1c:	48 8b 44 24 50       	mov    0x50(%rsp),%rax
  21:	48 39 f0             	cmp    %rsi,%rax
  24:	0f 85 01 fe ff ff    	jne    0xfffffe2b
* 2a:	48 8b 5c 24 18       	mov    0x18(%rsp),%rbx <-- trapping instruction
  2f:	45 89 ee             	mov    %r13d,%r14d
  32:	44 3b 35 99 b2 8a 0b 	cmp    0xb8ab299(%rip),%r14d        # 0xb8ab2d2
  39:	7e 07                	jle    0x42
  3b:	44                   	rex.R
  3c:	89                   	.byte 0x89
  3d:	35                   	.byte 0x35
  3e:	90                   	nop
  3f:	b2                   	.byte 0xb2