==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2de0/0x3cb0 kernel/locking/lockdep.c:5007
Read of size 8 at addr ffff888022af4c18 by task syz.0.689/6533

CPU: 0 UID: 0 PID: 6533 Comm: syz.0.689 Not tainted 6.11.0-rc5-syzkaller-00207-gfb24560f31f9 #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:__sanitizer_cov_trace_pc+0x18/0x70 kernel/kcov.c:212
Code: 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 15 24 c1 78 7e 65 8b 05 25 c1 78 7e a9 00 01 ff 00 <48> 8b 34 24 74 1d f6 c4 01 74 43 a9 00 00 0f 00 75 3c a9 00 00 f0
RSP: 0000:ffffc9000ca4ef18 EFLAGS: 00000246
RAX: 0000000080000001 RBX: ffffc9000ca4efa0 RCX: ffffffff813c9cce
RDX: ffff888061ae2440 RSI: 0000000000000004 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000004
R10: 0000000000000001 R11: dffffc0000000000 R12: ffffffff90add250
R13: ffffc9000ca4f860 R14: 0000000000000001 R15: 0000000000000001
 unwind_next_frame+0x1b21/0x23a0 arch/x86/kernel/unwind_orc.c:648
 arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
 save_stack+0x162/0x1f0 mm/page_owner.c:156
 __set_page_owner+0x8f/0x790 mm/page_owner.c:320
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493
 prep_new_page mm/page_alloc.c:1501 [inline]
 get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3439
 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4695
 alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2263
 folio_alloc_mpol_noprof+0x36/0xd0 mm/mempolicy.c:2281
 __read_swap_cache_async+0x27f/0x630 mm/swap_state.c:473
 swap_cluster_readahead+0x3bd/0x6e0 mm/swap_state.c:680
 swapin_readahead+0x13b/0xe40 mm/swap_state.c:882
 do_swap_page+0x4ca/0x3e60 mm/memory.c:4119
 handle_pte_fault mm/memory.c:5524 [inline]
 __handle_mm_fault+0x146b/0x5400 mm/memory.c:5664
 handle_mm_fault+0x498/0xa60 mm/memory.c:5832
 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0023:0xf7186b77
Code: fe ff 8b 46 1c 8b 4e 14 8d 50 f8 8d 59 08 8b 4c 24 0c 89 56 1c 8b 54 24 08 89 5e 14 89 50 f8 89 48 fc 8b 44 24 14 39 c7 73 79 <8b> 45 1c 8b 4c 24 18 99 03 04 f9 13 54 f9 04 83 7e 2c 07 89 44 24
RSP: 002b:00000000ff83da40 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 0000000000005640 RCX: 0000000000000000
RDX: 00000000000008d9 RSI: 00000000f7f95610 RDI: 0000000000000000
RBP: 00000000f7464fe8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 6547:
 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 6547:
 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:2252 [inline]
 slab_free mm/slub.c:4473 [inline]
 kfree+0x12a/0x3b0 mm/slub.c:4594
 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 ffff888022af4c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 freed 512-byte region [ffff888022af4c00, ffff888022af4e00)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22af4
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 ffffea0000861e00 dead000000000002
raw: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000
head: 00fff00000000040 ffff88801ac42c80 ffffea0000861e00 dead000000000002
head: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000
head: 00fff00000000002 ffffea00008abd01 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5704, tgid 5704 (syz-executor), ts 68236015278, free_ts 68182432845
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493
 prep_new_page mm/page_alloc.c:1501 [inline]
 get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3439
 __alloc_pages_slowpath mm/page_alloc.c:4228 [inline]
 __alloc_pages_noprof+0x6ad/0x2460 mm/page_alloc.c:4708
 __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:2321
 allocate_slab mm/slub.c:2484 [inline]
 new_slab+0x84/0x260 mm/slub.c:2537
 ___slab_alloc+0xdac/0x1870 mm/slub.c:3723
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813
 __slab_alloc_node mm/slub.c:3866 [inline]
 slab_alloc_node mm/slub.c:4025 [inline]
 __do_kmalloc_node mm/slub.c:4157 [inline]
 __kmalloc_node_noprof+0x367/0x440 mm/slub.c:4164
 kmalloc_array_node_noprof include/linux/slab.h:788 [inline]
 alloc_slab_obj_exts+0x41/0xa0 mm/slub.c:1976
 __memcg_slab_post_alloc_hook+0x2bc/0x9c0 mm/memcontrol.c:3019
 memcg_slab_post_alloc_hook mm/slub.c:2160 [inline]
 slab_post_alloc_hook mm/slub.c:3998 [inline]
 slab_alloc_node mm/slub.c:4037 [inline]
 kmem_cache_alloc_noprof+0x2cd/0x2f0 mm/slub.c:4044
 anon_vma_chain_alloc mm/rmap.c:142 [inline]
 anon_vma_fork+0x200/0x620 mm/rmap.c:364
 dup_mmap kernel/fork.c:712 [inline]
 dup_mm kernel/fork.c:1672 [inline]
 copy_mm+0x192b/0x2550 kernel/fork.c:1721
 copy_process+0x3ea8/0x6f50 kernel/fork.c:2374
 kernel_clone+0xfd/0x960 kernel/fork.c:2781
 __do_compat_sys_ia32_clone+0xb7/0x100 arch/x86/kernel/sys_ia32.c:254
page last free pid 5715 tgid 5715 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1094 [inline]
 free_unref_page+0x64a/0xe40 mm/page_alloc.c:2612
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3988 [inline]
 slab_alloc_node mm/slub.c:4037 [inline]
 kmem_cache_alloc_lru_noprof+0x121/0x2f0 mm/slub.c:4056
 shmem_alloc_inode+0x25/0x50 mm/shmem.c:4622
 alloc_inode+0x5d/0x230 fs/inode.c:263
 new_inode_pseudo fs/inode.c:1073 [inline]
 new_inode+0x22/0x210 fs/inode.c:1092
 __shmem_get_inode mm/shmem.c:2658 [inline]
 shmem_get_inode+0x194/0xe90 mm/shmem.c:2729
 shmem_mknod+0x66/0x240 mm/shmem.c:3426
 shmem_mkdir+0x31/0x60 mm/shmem.c:3487
 vfs_mkdir+0x57d/0x860 fs/namei.c:4210
 do_mkdirat+0x301/0x3a0 fs/namei.c:4233
 __do_sys_mkdirat fs/namei.c:4248 [inline]
 __se_sys_mkdirat fs/namei.c:4246 [inline]
 __ia32_sys_mkdirat+0x82/0xb0 fs/namei.c:4246
 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

Memory state around the buggy address:
 ffff888022af4b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888022af4b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888022af4c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888022af4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888022af4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	90                   	nop
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	f3 0f 1e fa          	endbr64
  16:	65 48 8b 15 24 c1 78 	mov    %gs:0x7e78c124(%rip),%rdx        # 0x7e78c142
  1d:	7e
  1e:	65 8b 05 25 c1 78 7e 	mov    %gs:0x7e78c125(%rip),%eax        # 0x7e78c14a
  25:	a9 00 01 ff 00       	test   $0xff0100,%eax
* 2a:	48 8b 34 24          	mov    (%rsp),%rsi <-- trapping instruction
  2e:	74 1d                	je     0x4d
  30:	f6 c4 01             	test   $0x1,%ah
  33:	74 43                	je     0x78
  35:	a9 00 00 0f 00       	test   $0xf0000,%eax
  3a:	75 3c                	jne    0x78
  3c:	a9                   	.byte 0xa9
  3d:	00 00                	add    %al,(%rax)
  3f:	f0                   	lock