==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2dd6/0x3b30 kernel/locking/lockdep.c:5005
Read of size 8 at addr ffff88802251ac18 by task syz-executor.0/6330

CPU: 3 PID: 6330 Comm: syz-executor.0 Not tainted 6.9.0-rc2-syzkaller-00207-ge8b0ccb2a787 #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+0x116/0x1f0 lib/dump_stack.c:114
 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+0x2dd6/0x3b30 kernel/locking/lockdep.c:5005
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 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+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:161 [inline]
 handle_irq arch/x86/kernel/irq.c:238 [inline]
 __common_interrupt+0xde/0x250 arch/x86/kernel/irq.c:257
 common_interrupt+0xab/0xd0 arch/x86/kernel/irq.c:247
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:__sanitizer_cov_trace_pc+0x45/0x60 kernel/kcov.c:212
Code: 24 74 0f f6 c4 01 74 35 8b 82 14 16 00 00 85 c0 74 2b 8b 82 f0 15 00 00 83 f8 02 75 20 48 8b 8a f8 15 00 00 8b 92 f4 15 00 00 <48> 8b 01 48 83 c0 01 48 39 d0 73 07 48 89 01 48 89 34 c1 c3 cc cc
RSP: 0018:ffffc9000377f0f0 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff8ff85c20 RCX: ffffc90005682000
RDX: 0000000000040000 RSI: ffffffff813cbba0 RDI: 0000000000000006
RBP: ffffffff8ff85c28 R08: 0000000000000006 R09: ffffffff81c830e3
R10: ffffffff81c830ac R11: dffffc0000000000 R12: ffffffff81c830e3
R13: ffffffff81c830ac R14: dffffc0000000000 R15: ffffffff8ff85c1c
 __orc_find+0x70/0x130 arch/x86/kernel/unwind_orc.c:99
 orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
 unwind_next_frame+0x335/0x23a0 arch/x86/kernel/unwind_orc.c:494
 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+0x75/0x440 mm/page_owner.c:301
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534
 prep_new_page mm/page_alloc.c:1541 [inline]
 get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317
 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575
 alloc_pages_mpol+0x275/0x610 mm/mempolicy.c:2264
 shmem_alloc_folio+0x114/0x150 mm/shmem.c:1634
 shmem_alloc_and_add_folio+0x14f/0x6f0 mm/shmem.c:1674
 shmem_get_folio_gfp+0x685/0x13e0 mm/shmem.c:2061
 shmem_get_folio mm/shmem.c:2166 [inline]
 shmem_write_begin+0x15a/0x370 mm/shmem.c:2750
 generic_perform_write+0x272/0x620 mm/filemap.c:3974
 shmem_file_write_iter+0x114/0x140 mm/shmem.c:2926
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6db/0x1100 fs/read_write.c:590
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x72/0x7a
RIP: 0033:0x7ff45e07cbaf
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 80 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 0c 81 02 00 48
RSP: 002b:00007ff45eea2e80 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000013bd7ef RCX: 00007ff45e07cbaf
RDX: 00000000013bd7ef RSI: 00007ff453e00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000005509
R10: 00000000000003ca R11: 0000000000000293 R12: 0000000000000003
R13: 00007ff45eea2f80 R14: 00007ff45eea2f40 R15: 00007ff453e00000
 </TASK>

Allocated by task 6342:
 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 include/linux/slab.h:628 [inline]
 p9_client_create+0xcf/0x1210 net/9p/client.c:980
 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
 v9fs_mount+0xc6/0xa90 fs/9p/vfs_super.c:122
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1779
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x14e6/0x1f20 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]
 __x64_sys_mount+0x297/0x320 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

Freed by task 6342:
 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 mm/kasan/common.c:240 [inline]
 __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2106 [inline]
 slab_free mm/slub.c:4280 [inline]
 kfree+0x129/0x390 mm/slub.c:4390
 p9_client_create+0xaaa/0x1210 net/9p/client.c:1051
 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
 v9fs_mount+0xc6/0xa90 fs/9p/vfs_super.c:122
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1779
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x14e6/0x1f20 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]
 __x64_sys_mount+0x297/0x320 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

The buggy address belongs to the object at ffff88802251ac00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 freed 512-byte region [ffff88802251ac00, ffff88802251ae00)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22518
head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 00fff80000000840 ffff888015442c80 ffffea00011ba700 dead000000000002
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
head: 00fff80000000840 ffff888015442c80 ffffea00011ba700 dead000000000002
head: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
head: 00fff80000000002 ffffea0000894601 dead000000000122 00000000ffffffff
head: 0000000400000000 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5231, tgid 5231 (syz-executor.2), ts 93068942301, free_ts 92981142061
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534
 prep_new_page mm/page_alloc.c:1541 [inline]
 get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317
 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page mm/slub.c:2175 [inline]
 allocate_slab mm/slub.c:2338 [inline]
 new_slab+0xcc/0x3a0 mm/slub.c:2391
 ___slab_alloc+0x66d/0x1790 mm/slub.c:3525
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 __do_kmalloc_node mm/slub.c:3965 [inline]
 __kmalloc+0x3b4/0x440 mm/slub.c:3979
 kmalloc include/linux/slab.h:632 [inline]
 kzalloc include/linux/slab.h:749 [inline]
 fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
 ip6_route_info_create+0x337/0x1940 net/ipv6/route.c:3759
 addrconf_f6i_alloc+0x393/0x670 net/ipv6/route.c:4583
 ipv6_add_addr+0x538/0x2090 net/ipv6/addrconf.c:1119
 addrconf_add_linklocal+0x2a6/0x650 net/ipv6/addrconf.c:3312
 addrconf_addr_gen+0x36f/0x3c0 net/ipv6/addrconf.c:3443
 addrconf_dev_config net/ipv6/addrconf.c:3489 [inline]
 addrconf_init_auto_addrs+0x446/0x820 net/ipv6/addrconf.c:3567
 addrconf_notify+0xe9e/0x19e0 net/ipv6/addrconf.c:3740
 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93
page last free pid 0 tgid 0 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1141 [inline]
 free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347
 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487
 rcu_do_batch kernel/rcu/tree.c:2196 [inline]
 rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2471
 __do_softirq+0x218/0x922 kernel/softirq.c:554

Memory state around the buggy address:
 ffff88802251ab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802251ab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802251ac00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88802251ac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802251ad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	74 0f                	je     0x11
   2:	f6 c4 01             	test   $0x1,%ah
   5:	74 35                	je     0x3c
   7:	8b 82 14 16 00 00    	mov    0x1614(%rdx),%eax
   d:	85 c0                	test   %eax,%eax
   f:	74 2b                	je     0x3c
  11:	8b 82 f0 15 00 00    	mov    0x15f0(%rdx),%eax
  17:	83 f8 02             	cmp    $0x2,%eax
  1a:	75 20                	jne    0x3c
  1c:	48 8b 8a f8 15 00 00 	mov    0x15f8(%rdx),%rcx
  23:	8b 92 f4 15 00 00    	mov    0x15f4(%rdx),%edx
* 29:	48 8b 01             	mov    (%rcx),%rax <-- trapping instruction
  2c:	48 83 c0 01          	add    $0x1,%rax
  30:	48 39 d0             	cmp    %rdx,%rax
  33:	73 07                	jae    0x3c
  35:	48 89 01             	mov    %rax,(%rcx)
  38:	48 89 34 c1          	mov    %rsi,(%rcx,%rax,8)
  3c:	c3                   	ret
  3d:	cc                   	int3
  3e:	cc                   	int3