==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2da1/0x3b40 kernel/locking/lockdep.c:5005
Read of size 8 at addr ffff88804ce21818 by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.8.0-rc3-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:377 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:488
 kasan_report+0xda/0x110 mm/kasan/report.c:601
 __lock_acquire+0x2da1/0x3b40 kernel/locking/lockdep.c:5005
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
 __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:394 [inline]
 p9_req_put net/9p/client.c:402 [inline]
 p9_req_put+0xca/0x250 net/9p/client.c:399
 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+0x22a/0x750 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:161 [inline]
 handle_irq arch/x86/kernel/irq.c:238 [inline]
 __common_interrupt+0xde/0x250 arch/x86/kernel/irq.c:257
 common_interrupt+0x52/0xd0 arch/x86/kernel/irq.c:247
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:640
RIP: 0010:pv_wait_node kernel/locking/qspinlock_paravirt.h:302 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x61c/0xc80 kernel/locking/qspinlock.c:476
Code: 83 e1 07 38 ca 7f 08 84 d2 0f 85 56 04 00 00 0f b6 55 14 84 d2 0f 85 aa 00 00 00 f3 90 83 e8 01 0f 84 9f 00 00 00 41 0f b6 10 <40> 38 d6 7c 08 84 d2 0f 85 f4 03 00 00 8b 53 08 85 d2 74 b6 49 89
RSP: 0018:ffffc900000079e8 EFLAGS: 00000206
RAX: 0000000000007e5c RBX: ffff88802c23db40 RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffffff8cfbaa78
RBP: ffff88802c53db40 R08: ffffed1005847b69 R09: ffff88802c23db40
R10: ffffffff8e6dbec3 R11: 0000000000000001 R12: ffffed10058a7b6a
R13: ffff88802c53db54 R14: dffffc0000000000 R15: ffffffff8e6dbec0
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:584 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x212/0x2c0 kernel/locking/spinlock_debug.c:116
 spin_lock include/linux/spinlock.h:351 [inline]
 mac80211_hwsim_tx_frame_no_nl.isra.0+0x708/0x1300 drivers/net/wireless/virtual/mac80211_hwsim.c:1801
 mac80211_hwsim_tx_frame+0x1eb/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2186
 mac80211_hwsim_beacon_tx+0x41b/0x740 drivers/net/wireless/virtual/mac80211_hwsim.c:2279
 __iterate_interfaces+0x2d2/0x580 net/mac80211/util.c:767
 ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 net/mac80211/util.c:803
 mac80211_hwsim_beacon+0x105/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2305
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x203/0xc30 kernel/time/hrtimer.c:1752
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1769
 __do_softirq+0x21c/0x8e7 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0xbb/0x120 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:default_idle+0xf/0x20 arch/x86/kernel/process.c:743
Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d f3 92 2c 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffffff8d207e18 EFLAGS: 00000246
RAX: 00000000000fcced RBX: 0000000000000000 RCX: ffffffff8ab9fe8b
RDX: 0000000000000000 RSI: ffffffff8aecaf00 RDI: ffffffff8b4db8c0
RBP: fffffbfff1a52ae0 R08: 0000000000000001 R09: ffffed1005846ded
R10: ffff88802c236f6b R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8d295700 R14: ffffffff8f791290 R15: 0000000000000000
 default_idle_call+0x69/0xa0 kernel/sched/idle.c:97
 cpuidle_idle_call kernel/sched/idle.c:170 [inline]
 do_idle+0x336/0x400 kernel/sched/idle.c:312
 cpu_startup_entry+0x50/0x60 kernel/sched/idle.c:410
 rest_init+0x16f/0x2b0 init/main.c:730
 arch_call_rest_init+0x13/0x40 init/main.c:827
 start_kernel+0x39f/0x480 init/main.c:1072
 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:555
 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:536
 secondary_startup_64_no_verify+0x170/0x17b
 </TASK>

Allocated by task 6082:
 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:372 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:389
 kmalloc include/linux/slab.h:590 [inline]
 p9_client_create+0xcf/0x11b0 net/9p/client.c:980
 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:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1784
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x6e2/0x1f10 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346
 entry_SYSENTER_compat_after_hwframe+0x7c/0x86

Freed by task 6082:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640
 poison_slab_object mm/kasan/common.c:241 [inline]
 __kasan_slab_free+0x121/0x1c0 mm/kasan/common.c:257
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2121 [inline]
 slab_free mm/slub.c:4299 [inline]
 kfree+0x124/0x370 mm/slub.c:4409
 p9_client_create+0x9cb/0x11b0 net/9p/client.c:1051
 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:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1784
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x6e2/0x1f10 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346
 entry_SYSENTER_compat_after_hwframe+0x7c/0x86

The buggy address belongs to the object at ffff88804ce21800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 freed 512-byte region [ffff88804ce21800, ffff88804ce21a00)

The buggy address belongs to the physical page:
page:ffffea0001338800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ce20
head:ffffea0001338800 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x4fff00000000840(slab|head|node=1|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 04fff00000000840 ffff888014c42c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000080100010 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 46, tgid 46 (kworker/1:1), ts 145980166733, free_ts 145648518163
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533
 prep_new_page mm/page_alloc.c:1540 [inline]
 get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311
 __alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page mm/slub.c:2190 [inline]
 allocate_slab mm/slub.c:2354 [inline]
 new_slab+0xcc/0x3a0 mm/slub.c:2407
 ___slab_alloc+0x4b0/0x1780 mm/slub.c:3540
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3625
 __slab_alloc_node mm/slub.c:3678 [inline]
 slab_alloc_node mm/slub.c:3850 [inline]
 kmalloc_trace+0x30b/0x340 mm/slub.c:4007
 kmalloc include/linux/slab.h:590 [inline]
 kzalloc include/linux/slab.h:711 [inline]
 mca_alloc net/ipv6/mcast.c:880 [inline]
 __ipv6_dev_mc_inc+0x2b7/0xc50 net/ipv6/mcast.c:936
 addrconf_join_solict net/ipv6/addrconf.c:2192 [inline]
 addrconf_dad_begin net/ipv6/addrconf.c:4037 [inline]
 addrconf_dad_work+0x232/0x14c0 net/ipv6/addrconf.c:4162
 process_one_work+0x835/0x1570 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2706 [inline]
 worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787
 kthread+0x2c6/0x3b0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
page last free pid 5272 tgid 5272 stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1140 [inline]
 free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2346
 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486
 __put_partials+0x14c/0x170 mm/slub.c:2922
 qlink_free mm/kasan/quarantine.c:160 [inline]
 qlist_free_all+0x58/0x150 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:324
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3813 [inline]
 slab_alloc_node mm/slub.c:3860 [inline]
 __do_kmalloc_node mm/slub.c:3980 [inline]
 __kmalloc+0x1bd/0x440 mm/slub.c:3994
 kmalloc include/linux/slab.h:594 [inline]
 tomoyo_realpath_from_path+0xbf/0x710 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x273/0x480 security/tomoyo/file.c:822
 security_inode_getattr+0xf4/0x160 security/security.c:2237
 vfs_getattr fs/stat.c:173 [inline]
 vfs_fstat+0x53/0xd0 fs/stat.c:198
 vfs_fstatat+0x134/0x150 fs/stat.c:300
 __do_sys_newfstatat+0x98/0x120 fs/stat.c:468
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77

Memory state around the buggy address:
 ffff88804ce21700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804ce21780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804ce21800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88804ce21880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804ce21900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	83 e1 07             	and    $0x7,%ecx
   3:	38 ca                	cmp    %cl,%dl
   5:	7f 08                	jg     0xf
   7:	84 d2                	test   %dl,%dl
   9:	0f 85 56 04 00 00    	jne    0x465
   f:	0f b6 55 14          	movzbl 0x14(%rbp),%edx
  13:	84 d2                	test   %dl,%dl
  15:	0f 85 aa 00 00 00    	jne    0xc5
  1b:	f3 90                	pause
  1d:	83 e8 01             	sub    $0x1,%eax
  20:	0f 84 9f 00 00 00    	je     0xc5
  26:	41 0f b6 10          	movzbl (%r8),%edx
* 2a:	40 38 d6             	cmp    %dl,%sil <-- trapping instruction
  2d:	7c 08                	jl     0x37
  2f:	84 d2                	test   %dl,%dl
  31:	0f 85 f4 03 00 00    	jne    0x42b
  37:	8b 53 08             	mov    0x8(%rbx),%edx
  3a:	85 d2                	test   %edx,%edx
  3c:	74 b6                	je     0xfffffff4
  3e:	49                   	rex.WB
  3f:	89                   	.byte 0x89