==================================================================
BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x271/0x2c0 kernel/locking/spinlock_debug.c:115
Read of size 4 at addr ffff888035a2c404 by task kworker/3:1/59

CPU: 3 UID: 0 PID: 59 Comm: kworker/3:1 Not tainted 6.14.0-rc7-syzkaller-00069-g81e4f8d68c66 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: rcu_gp process_srcu
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
 debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
 do_raw_spin_lock+0x271/0x2c0 kernel/locking/spinlock_debug.c:115
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x42/0x60 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+0xba/0xe0 arch/x86/kernel/irq.c:280
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:preempt_latency_start kernel/sched/core.c:5837 [inline]
RIP: 0010:preempt_count_add+0x5e/0x150 kernel/sched/core.c:5863
Code: 08 84 d2 0f 85 dd 00 00 00 8b 15 cd bb 03 19 85 d2 75 0b 65 8b 05 6a 7c 7b 7e 3c f4 77 6b 65 8b 05 5f 7c 7b 7e 25 ff ff ff 7f <39> c3 74 07 5b 5d c3 cc cc cc cc 48 8b 5c 24 10 48 89 df e8 7a b4
RSP: 0018:ffffc90000abfab8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 1ffffffff3518314
RDX: 0000000000000000 RSI: ffffffff8bd36920 RDI: 0000000000000001
RBP: 0000002001bb2b3a R08: 0000000000000001 R09: ffffed102dba8d38
R10: ffff88816dd469c7 R11: 0000000000000002 R12: 0000000000000003
R13: 00000000000032c9 R14: ffffffff9a8f4fe0 R15: 0000000000001a10
 delay_tsc+0x3c/0xc0 arch/x86/lib/delay.c:79
 udelay include/asm-generic/delay.h:64 [inline]
 try_check_zero+0x3c6/0x5a0 kernel/rcu/srcutree.c:1112
 srcu_advance_state kernel/rcu/srcutree.c:1742 [inline]
 process_srcu+0x575/0x1720 kernel/rcu/srcutree.c:1851
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 6223:
 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 6223:
 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 ffff888035a2c400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 4 bytes inside of
 freed 512-byte region [ffff888035a2c400, ffff888035a2c600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x35a2c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b042c80 0000000000000000 0000000000000001
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042c80 0000000000000000 0000000000000001
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000d68b01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5940, tgid 5940 (syz-executor), ts 46356063826, free_ts 46355207819
 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:4740
 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]
 tnode_alloc net/ipv4/fib_trie.c:327 [inline]
 tnode_new+0x25a/0x340 net/ipv4/fib_trie.c:380
 inflate net/ipv4/fib_trie.c:540 [inline]
 resize+0xa2b/0x2250 net/ipv4/fib_trie.c:864
 trie_rebalance net/ipv4/fib_trie.c:1101 [inline]
 fib_insert_node net/ipv4/fib_trie.c:1145 [inline]
 fib_insert_alias+0x9c0/0xe30 net/ipv4/fib_trie.c:1159
 fib_table_insert+0xaab/0x1d70 net/ipv4/fib_trie.c:1373
 fib_magic+0x4d6/0x5c0 net/ipv4/fib_frontend.c:1112
 fib_add_ifaddr+0x174/0x560 net/ipv4/fib_frontend.c:1134
 fib_inetaddr_event+0x174/0x2c0 net/ipv4/fib_frontend.c:1448
 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85
page last free pid 5940 tgid 5940 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
 __put_partials+0x14c/0x170 mm/slub.c:3153
 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:
 ffff888035a2c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888035a2c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888035a2c400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888035a2c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888035a2c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	08 84 d2 0f 85 dd 00 	or     %al,0xdd850f(%rdx,%rdx,8)
   7:	00 00                	add    %al,(%rax)
   9:	8b 15 cd bb 03 19    	mov    0x1903bbcd(%rip),%edx        # 0x1903bbdc
   f:	85 d2                	test   %edx,%edx
  11:	75 0b                	jne    0x1e
  13:	65 8b 05 6a 7c 7b 7e 	mov    %gs:0x7e7b7c6a(%rip),%eax        # 0x7e7b7c84
  1a:	3c f4                	cmp    $0xf4,%al
  1c:	77 6b                	ja     0x89
  1e:	65 8b 05 5f 7c 7b 7e 	mov    %gs:0x7e7b7c5f(%rip),%eax        # 0x7e7b7c84
  25:	25 ff ff ff 7f       	and    $0x7fffffff,%eax
* 2a:	39 c3                	cmp    %eax,%ebx <-- trapping instruction
  2c:	74 07                	je     0x35
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	c3                   	ret
  31:	cc                   	int3
  32:	cc                   	int3
  33:	cc                   	int3
  34:	cc                   	int3
  35:	48 8b 5c 24 10       	mov    0x10(%rsp),%rbx
  3a:	48 89 df             	mov    %rbx,%rdi
  3d:	e8                   	.byte 0xe8
  3e:	7a b4                	jp     0xfffffff4