==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x4208/0x5de0 kernel/locking/lockdep.c:5012
Read of size 8 at addr ffff888052eb7418 by task syz-executor.2/12397

CPU: 1 PID: 12397 Comm: syz-executor.2 Not tainted 6.5.0-rc5-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 __lock_acquire+0x4208/0x5de0 kernel/locking/lockdep.c:5012
 lock_acquire kernel/locking/lockdep.c:5761 [inline]
 lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
 p9_tag_remove net/9p/client.c:394 [inline]
 p9_req_put net/9p/client.c:402 [inline]
 p9_req_put+0xc6/0x250 net/9p/client.c:399
 req_done+0x1e7/0x2e0 net/9p/trans_virtio.c:147
 vring_interrupt drivers/virtio/virtio_ring.c:2501 [inline]
 vring_interrupt+0x317/0x3f0 drivers/virtio/virtio_ring.c:2476
 __handle_irq_event_percpu+0x22a/0x740 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+0x261/0xcf0 kernel/irq/chip.c:834
 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
 handle_irq arch/x86/kernel/irq.c:238 [inline]
 __common_interrupt+0x9f/0x220 arch/x86/kernel/irq.c:257
 common_interrupt+0xa9/0xd0 arch/x86/kernel/irq.c:247
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
RIP: 0010:debug_lockdep_rcu_enabled+0x2f/0x30 kernel/rcu/update.c:321
Code: 05 ee ab 79 04 85 c0 74 21 8b 05 ec df 79 04 85 c0 74 17 65 48 8b 04 25 80 b9 03 00 8b 80 c4 0a 00 00 85 c0 0f 94 c0 0f b6 c0 <c3> 66 0f 1f 00 55 53 65 8b 05 ef a4 d0 75 85 c0 40 0f 95 c5 65 8b
RSP: 0018:ffffc9002a117618 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff8880411b0b88 RCX: 0000000000000000
RDX: ffff888073efa400 RSI: ffffffff81e4a8e7 RDI: ffff8880411b0b88
RBP: 000000000005e028 R08: 0000000000000006 R09: 0000000000000001
R10: 0000000000000001 R11: 000000000000519a R12: 0000000000000008
R13: ffff88803fff9160 R14: 0000000000000002 R15: ffffea0001780a00
 rcu_read_unlock include/linux/rcupdate.h:778 [inline]
 page_ext_put+0x1c/0xd0 mm/page_ext.c:192
 page_table_check_clear include/linux/mmzone.h:2010 [inline]
 __page_table_check_pte_clear+0x24f/0x2a0 mm/page_table_check.c:161
 page_table_check_pte_clear include/linux/page_table_check.h:55 [inline]
 ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1087 [inline]
 zap_pte_range mm/memory.c:1431 [inline]
 zap_pmd_range mm/memory.c:1570 [inline]
 zap_pud_range mm/memory.c:1599 [inline]
 zap_p4d_range mm/memory.c:1620 [inline]
 unmap_page_range+0x1dbf/0x32e0 mm/memory.c:1641
 unmap_single_vma+0x194/0x2b0 mm/memory.c:1687
 unmap_vmas+0x267/0x3c0 mm/memory.c:1726
 exit_mmap+0x1a7/0x960 mm/mmap.c:3203
 __mmput+0x12a/0x4d0 kernel/fork.c:1348
 mmput+0x62/0x70 kernel/fork.c:1370
 exit_mm kernel/exit.c:567 [inline]
 do_exit+0x9b4/0x2a20 kernel/exit.c:861
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024
 get_signal+0x23ea/0x2770 kernel/signal.c:2881
 arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:308
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 __do_fast_syscall_32+0x6d/0xe0 arch/x86/entry/common.c:181
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7f71579
Code: Unable to access opcode bytes at 0xf7f7154f.
RSP: 002b:00000000f7f6c66c EFLAGS: 00000246 ORIG_RAX: 00000000000000f0
RAX: 0000000000000001 RBX: 00000000f737afcc RCX: 0000000000000081
RDX: 00000000000f4240 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000f7219d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 12398:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
 kmalloc include/linux/slab.h:582 [inline]
 p9_client_create+0xcf/0x1210 net/9p/client.c:978
 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
 v9fs_mount+0xc6/0xcd0 fs/9p/vfs_super.c:123
 legacy_get_tree+0x109/0x220 fs/fs_context.c:611
 vfs_get_tree+0x88/0x350 fs/super.c:1519
 do_new_mount fs/namespace.c:3335 [inline]
 path_mount+0x1492/0x1ed0 fs/namespace.c:3662
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount fs/namespace.c:3861 [inline]
 __ia32_sys_mount+0x291/0x310 fs/namespace.c:3861
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Freed by task 12398:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x15e/0x1b0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1792 [inline]
 slab_free_freelist_hook+0x10b/0x1e0 mm/slub.c:1818
 slab_free mm/slub.c:3801 [inline]
 __kmem_cache_free+0xb8/0x2f0 mm/slub.c:3814
 p9_client_create+0xa14/0x1210 net/9p/client.c:1049
 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
 v9fs_mount+0xc6/0xcd0 fs/9p/vfs_super.c:123
 legacy_get_tree+0x109/0x220 fs/fs_context.c:611
 vfs_get_tree+0x88/0x350 fs/super.c:1519
 do_new_mount fs/namespace.c:3335 [inline]
 path_mount+0x1492/0x1ed0 fs/namespace.c:3662
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount fs/namespace.c:3861 [inline]
 __ia32_sys_mount+0x291/0x310 fs/namespace.c:3861
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Last potentially related work creation:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492
 insert_work+0x4a/0x330 kernel/workqueue.c:1553
 __queue_work+0x5f5/0x1040 kernel/workqueue.c:1714
 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1746 [inline]
 __run_timers+0x585/0xb10 kernel/time/timer.c:2022
 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035
 __do_softirq+0x218/0x965 kernel/softirq.c:553

The buggy address belongs to the object at ffff888052eb7400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 freed 512-byte region [ffff888052eb7400, ffff888052eb7600)

The buggy address belongs to the physical page:
page:ffffea00014bad00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x52eb4
head:ffffea00014bad00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x4fff00000010200(slab|head|node=1|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 04fff00000010200 ffff888012842c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000001ffffffff 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 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 10, tgid 10 (kworker/u17:0), ts 100966389141, free_ts 98418430446
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477
 __alloc_pages_node include/linux/gfp.h:237 [inline]
 alloc_slab_page mm/slub.c:1864 [inline]
 allocate_slab+0xa1/0x380 mm/slub.c:2009
 new_slab mm/slub.c:2062 [inline]
 ___slab_alloc+0x8bc/0x1570 mm/slub.c:3215
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314
 __slab_alloc_node mm/slub.c:3367 [inline]
 slab_alloc_node mm/slub.c:3460 [inline]
 __kmem_cache_alloc_node+0x137/0x350 mm/slub.c:3509
 kmalloc_node_trace+0x22/0xd0 mm/slab_common.c:1089
 kmalloc_node include/linux/slab.h:598 [inline]
 new_vmap_block mm/vmalloc.c:2034 [inline]
 vb_alloc mm/vmalloc.c:2212 [inline]
 vm_map_ram+0x6d7/0xd90 mm/vmalloc.c:2389
 _xfs_buf_map_pages+0x158/0x3a0 fs/xfs/xfs_buf.c:440
 xfs_buf_get_map+0x1d5c/0x31c0 fs/xfs/xfs_buf.c:718
 xfs_buf_read_map+0xd0/0xad0 fs/xfs/xfs_buf.c:810
 xfs_buf_readahead_map+0x9a/0xd0 fs/xfs/xfs_buf.c:888
 xfs_buf_readahead fs/xfs/xfs_buf.h:262 [inline]
 xfs_btree_reada_bufs+0x180/0x1f0 fs/xfs/libxfs/xfs_btree.c:926
 xfs_iwalk_ichunk_ra+0x2df/0x440 fs/xfs/xfs_iwalk.c:114
 xfs_iwalk_ag+0x62e/0x9b0 fs/xfs/xfs_iwalk.c:455
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1161 [inline]
 free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2348
 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2443
 kasan_depopulate_vmalloc_pte+0x63/0x80 mm/kasan/shadow.c:427
 apply_to_pte_range mm/memory.c:2596 [inline]
 apply_to_pmd_range mm/memory.c:2640 [inline]
 apply_to_pud_range mm/memory.c:2676 [inline]
 apply_to_p4d_range mm/memory.c:2712 [inline]
 __apply_to_page_range+0x5ed/0xd40 mm/memory.c:2746
 kasan_release_vmalloc+0xa8/0xc0 mm/kasan/shadow.c:544
 __purge_vmap_area_lazy+0x8b9/0x2160 mm/vmalloc.c:1770
 drain_vmap_area_work+0x54/0xd0 mm/vmalloc.c:1804
 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
 worker_thread+0x687/0x1110 kernel/workqueue.c:2748
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

Memory state around the buggy address:
 ffff888052eb7300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888052eb7380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888052eb7400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888052eb7480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888052eb7500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	05 ee ab 79 04       	add    $0x479abee,%eax
   5:	85 c0                	test   %eax,%eax
   7:	74 21                	je     0x2a
   9:	8b 05 ec df 79 04    	mov    0x479dfec(%rip),%eax        # 0x479dffb
   f:	85 c0                	test   %eax,%eax
  11:	74 17                	je     0x2a
  13:	65 48 8b 04 25 80 b9 	mov    %gs:0x3b980,%rax
  1a:	03 00
  1c:	8b 80 c4 0a 00 00    	mov    0xac4(%rax),%eax
  22:	85 c0                	test   %eax,%eax
  24:	0f 94 c0             	sete   %al
  27:	0f b6 c0             	movzbl %al,%eax
* 2a:	c3                   	ret <-- trapping instruction
  2b:	66 0f 1f 00          	nopw   (%rax)
  2f:	55                   	push   %rbp
  30:	53                   	push   %rbx
  31:	65 8b 05 ef a4 d0 75 	mov    %gs:0x75d0a4ef(%rip),%eax        # 0x75d0a527
  38:	85 c0                	test   %eax,%eax
  3a:	40 0f 95 c5          	setne  %bpl
  3e:	65                   	gs
  3f:	8b                   	.byte 0x8b