==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2d90/0x3c40 kernel/locking/lockdep.c:5091
Read of size 8 at addr ffff888043754418 by task syz.2.706/8599

CPU: 3 UID: 0 PID: 8599 Comm: syz.2.706 Not tainted 6.14.0-rc5-syzkaller-00013-g99fa936e8e4f #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:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xc3/0x670 mm/kasan/report.c:521
 kasan_report+0xd9/0x110 mm/kasan/report.c:634
 __lock_acquire+0x2d90/0x3c40 kernel/locking/lockdep.c:5091
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
 __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:2715 [inline]
 vring_interrupt+0x31b/0x400 drivers/virtio/virtio_ring.c:2690
 __handle_irq_event_percpu+0x229/0x7d0 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:249 [inline]
 call_irq_handler arch/x86/kernel/irq.c:261 [inline]
 __common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:287
 common_interrupt+0x61/0xe0 arch/x86/kernel/irq.c:280
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:handle_softirqs+0x1da/0x8f0 kernel/softirq.c:547
Code: 89 44 24 18 48 89 6c 24 10 48 c7 c7 40 75 6b 8b e8 eb 3d db 09 65 66 c7 05 39 ca 87 7e 00 00 e8 7c 8a 45 00 fb bb ff ff ff ff <49> c7 c6 c0 b0 e0 8d 41 0f bc dc 83 c3 01 0f 85 a4 00 00 00 e9 b1
RSP: 0018:ffffc90000708f28 EFLAGS: 00000206
RAX: 0000000000000324 RBX: 00000000ffffffff RCX: 1ffffffff2dd8b87
RDX: 0000000000000000 RSI: ffffffff8b6cee00 RDI: ffffffff8bd35aa0
RBP: ffff88802fea2440 R08: 0000000000000001 R09: fffffbfff2dd8598
R10: ffffffff96ec2cc7 R11: 0000000000000003 R12: 0000000000000202
R13: 000000000000000a R14: 0000000000000001 R15: 0000000000000000
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__tlb_adjust_range include/asm-generic/tlb.h:382 [inline]
RIP: 0010:tlb_flush_pte_range include/asm-generic/tlb.h:593 [inline]
RIP: 0010:tlb_remove_tlb_entries include/asm-generic/tlb.h:647 [inline]
RIP: 0010:zap_present_folio_ptes mm/memory.c:1529 [inline]
RIP: 0010:zap_present_ptes mm/memory.c:1596 [inline]
RIP: 0010:do_zap_pte_range mm/memory.c:1698 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1742 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1834 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1863 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1884 [inline]
RIP: 0010:unmap_page_range+0x14a3/0x4390 mm/memory.c:1905
Code: 08 84 c9 0f 85 e2 25 00 00 41 83 6d 00 01 48 89 ee 48 8b 7c 24 30 e8 8c df 66 ff 48 8b 04 24 48 8d 78 10 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 ac 25 00 00 48 8b 0c 24 48 8b 74 24 20 48 8b
RSP: 0018:ffffc90005c87628 EFLAGS: 00000a02
RAX: 1ffff92000b90f57 RBX: 0000000000000000 RCX: ffffffff816abe24
RDX: ffff88802fea2440 RSI: ffffffff816abe2e RDI: ffffc90005c87ab8
RBP: 800000004a580007 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000000
R13: ffffc90005c87790 R14: ffff888029313200 R15: dffffc0000000000
 unmap_single_vma+0x194/0x2b0 mm/memory.c:1951
 unmap_vmas+0x22f/0x490 mm/memory.c:1995
 exit_mmap+0x1c1/0xba0 mm/mmap.c:1284
 __mmput+0x12a/0x410 kernel/fork.c:1356
 mmput+0x62/0x70 kernel/fork.c:1378
 exit_mm kernel/exit.c:570 [inline]
 do_exit+0x9ba/0x2d70 kernel/exit.c:925
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
 get_signal+0x24ed/0x26c0 kernel/signal.c:3036
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [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_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ec338d169
Code: Unable to access opcode bytes at 0x7f4ec338d13f.
RSP: 002b:00007f4ec414d0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f4ec35a5fa8 RCX: 00007f4ec338d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4ec35a5fa8
RBP: 00007f4ec35a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4ec35a5fac
R13: 0000000000000000 R14: 00007ffdc466d7e0 R15: 00007ffdc466d8c8
 </TASK>

Allocated by task 8626:
 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:377 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
 kmalloc_noprof include/linux/slab.h:901 [inline]
 p9_client_create+0xc8/0x1200 net/9p/client.c:985
 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
 v9fs_mount+0xc6/0xa30 fs/9p/vfs_super.c:122
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8b/0x340 fs/super.c:1814
 do_new_mount fs/namespace.c:3560 [inline]
 path_mount+0x14e6/0x1f10 fs/namespace.c:3887
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount fs/namespace.c:4088 [inline]
 __x64_sys_mount+0x28f/0x310 fs/namespace.c:4088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 8626:
 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:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2353 [inline]
 slab_free mm/slub.c:4609 [inline]
 kfree+0x2c4/0x4d0 mm/slub.c:4757
 p9_client_create+0xa58/0x1200 net/9p/client.c:1064
 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
 v9fs_mount+0xc6/0xa30 fs/9p/vfs_super.c:122
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8b/0x340 fs/super.c:1814
 do_new_mount fs/namespace.c:3560 [inline]
 path_mount+0x14e6/0x1f10 fs/namespace.c:3887
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount fs/namespace.c:4088 [inline]
 __x64_sys_mount+0x28f/0x310 fs/namespace.c:4088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888043754400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 freed 512-byte region [ffff888043754400, ffff888043754600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x43754
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: f5(slab)
raw: 00fff00000000040 ffff88801b042c80 ffffea0000d76100 dead000000000002
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042c80 ffffea0000d76100 dead000000000002
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00010dd501 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 64, tgid 64 (kworker/u32:3), ts 97004166979, free_ts 96891842605
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4739
 alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab mm/slub.c:2587 [inline]
 new_slab+0x23d/0x330 mm/slub.c:2640
 ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 __do_kmalloc_node mm/slub.c:4293 [inline]
 __kmalloc_noprof+0x2ec/0x510 mm/slub.c:4306
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
 ip6_route_info_create+0x337/0x1910 net/ipv6/route.c:3766
 ip6_route_add+0x26/0x1c0 net/ipv6/route.c:3858
 addrconf_prefix_route+0x2fe/0x510 net/ipv6/addrconf.c:2485
 addrconf_add_linklocal+0x32a/0x620 net/ipv6/addrconf.c:3310
 addrconf_addr_gen+0x36f/0x3c0 net/ipv6/addrconf.c:3439
 addrconf_dev_config net/ipv6/addrconf.c:3485 [inline]
 addrconf_init_auto_addrs+0x446/0x820 net/ipv6/addrconf.c:3563
 addrconf_notify+0x6e2/0x19c0 net/ipv6/addrconf.c:3736
page last free pid 5953 tgid 5953 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4115 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 kmem_cache_alloc_node_noprof+0x223/0x3c0 mm/slub.c:4216
 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:596
 alloc_skb include/linux/skbuff.h:1331 [inline]
 netlink_alloc_large_skb+0x69/0x130 net/netlink/af_netlink.c:1186
 netlink_sendmsg+0x689/0xd70 net/netlink/af_netlink.c:1857
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:733 [inline]
 __sys_sendto+0x488/0x4f0 net/socket.c:2187
 __do_sys_sendto net/socket.c:2194 [inline]
 __se_sys_sendto net/socket.c:2190 [inline]
 __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2190
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888043754300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888043754380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888043754400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888043754480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888043754500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	89 44 24 18          	mov    %eax,0x18(%rsp)
   4:	48 89 6c 24 10       	mov    %rbp,0x10(%rsp)
   9:	48 c7 c7 40 75 6b 8b 	mov    $0xffffffff8b6b7540,%rdi
  10:	e8 eb 3d db 09       	call   0x9db3e00
  15:	65 66 c7 05 39 ca 87 	movw   $0x0,%gs:0x7e87ca39(%rip)        # 0x7e87ca58
  1c:	7e 00 00
  1f:	e8 7c 8a 45 00       	call   0x458aa0
  24:	fb                   	sti
  25:	bb ff ff ff ff       	mov    $0xffffffff,%ebx
* 2a:	49 c7 c6 c0 b0 e0 8d 	mov    $0xffffffff8de0b0c0,%r14 <-- trapping instruction
  31:	41 0f bc dc          	bsf    %r12d,%ebx
  35:	83 c3 01             	add    $0x1,%ebx
  38:	0f 85 a4 00 00 00    	jne    0xe2
  3e:	e9                   	.byte 0xe9
  3f:	b1                   	.byte 0xb1