==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2dd6/0x3b30 kernel/locking/lockdep.c:5005
Read of size 8 at addr ffff888029c20818 by task kworker/3:3/5257

CPU: 3 PID: 5257 Comm: kworker/3:3 Not tainted 6.9.0-rc6-syzkaller-00022-g98369dccd2f8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events nsim_dev_trap_report_work
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:check_kcov_mode kernel/kcov.c:175 [inline]
RIP: 0010:write_comp_data+0x2e/0x90 kernel/kcov.c:236
Code: 89 f8 49 89 f1 65 48 8b 15 1f 18 76 7e 65 8b 05 20 18 76 7e a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 82 14 16 00 00 85 c0 74 4f <8b> 82 f0 15 00 00 83 f8 03 75 44 48 8b 82 f8 15 00 00 8b 92 f4 15
RSP: 0018:ffffc90004707648 EFLAGS: 00000246
RAX: 0000000080000002 RBX: ffffffff8fae5088 RCX: ffffffff813d0bf4
RDX: ffff8880257ca440 RSI: ffffffff81347941 RDI: 0000000000000006
RBP: ffffffff8fae5088 R08: 0000000000000006 R09: ffffffff81347941
R10: ffffffff813479c5 R11: 0000000000000004 R12: ffffffff81347941
R13: ffffffff813479c5 R14: dffffc0000000000 R15: ffffffff8fae5088
 __orc_find+0xc4/0x130 arch/x86/kernel/unwind_orc.c:102
 orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
 unwind_next_frame+0x335/0x23a0 arch/x86/kernel/unwind_orc.c:494
 __unwind_start+0x5aa/0x880 arch/x86/kernel/unwind_orc.c:760
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xb2/0x170 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3798 [inline]
 slab_alloc_node mm/slub.c:3845 [inline]
 kmem_cache_alloc_node+0x177/0x340 mm/slub.c:3888
 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:658
 alloc_skb include/linux/skbuff.h:1313 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
 nsim_dev_trap_report_work+0x2a4/0xc80 drivers/net/netdevsim/dev.c:850
 process_one_work+0x9a9/0x1ac0 kernel/workqueue.c:3267
 process_scheduled_works kernel/workqueue.c:3348 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3429
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 8829:
 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+0xc6/0xaa0 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+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 8829:
 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+0xc6/0xaa0 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+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888029c20800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 freed 512-byte region [ffff888029c20800, ffff888029c20a00)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29c20
head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888015042c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
head: 00fff00000000840 ffff888015042c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
head: 00fff00000000002 ffffea0000a70801 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 5214, tgid 964921336 (syz-executor.3), ts 5214, free_ts 95437501290
 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]
 new_dir fs/proc/proc_sysctl.c:956 [inline]
 get_subdir fs/proc/proc_sysctl.c:1000 [inline]
 sysctl_mkdir_p fs/proc/proc_sysctl.c:1295 [inline]
 __register_sysctl_table+0xdab/0x16c0 fs/proc/proc_sysctl.c:1376
 mpls_dev_sysctl_register+0x1eb/0x330 net/mpls/af_mpls.c:1422
 mpls_add_dev net/mpls/af_mpls.c:1478 [inline]
 mpls_dev_notify+0x498/0xa10 net/mpls/af_mpls.c:1618
 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1950
 call_netdevice_notifiers_extack net/core/dev.c:1988 [inline]
 call_netdevice_notifiers net/core/dev.c:2002 [inline]
 register_netdevice+0x15f5/0x1ca0 net/core/dev.c:10316
 macvlan_common_newlink+0x10d5/0x1a10 drivers/net/macvlan.c:1534
 macvtap_newlink drivers/net/macvtap.c:108 [inline]
 macvtap_newlink+0x1a2/0x270 drivers/net/macvtap.c:80
 rtnl_newlink_create net/core/rtnetlink.c:3494 [inline]
 __rtnl_newlink+0x1197/0x1960 net/core/rtnetlink.c:3714
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:
 ffff888029c20700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888029c20780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888029c20800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888029c20880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888029c20900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	89 f8                	mov    %edi,%eax
   2:	49 89 f1             	mov    %rsi,%r9
   5:	65 48 8b 15 1f 18 76 	mov    %gs:0x7e76181f(%rip),%rdx        # 0x7e76182c
   c:	7e
   d:	65 8b 05 20 18 76 7e 	mov    %gs:0x7e761820(%rip),%eax        # 0x7e761834
  14:	a9 00 01 ff 00       	test   $0xff0100,%eax
  19:	74 0f                	je     0x2a
  1b:	f6 c4 01             	test   $0x1,%ah
  1e:	74 59                	je     0x79
  20:	8b 82 14 16 00 00    	mov    0x1614(%rdx),%eax
  26:	85 c0                	test   %eax,%eax
  28:	74 4f                	je     0x79
* 2a:	8b 82 f0 15 00 00    	mov    0x15f0(%rdx),%eax <-- trapping instruction
  30:	83 f8 03             	cmp    $0x3,%eax
  33:	75 44                	jne    0x79
  35:	48 8b 82 f8 15 00 00 	mov    0x15f8(%rdx),%rax
  3c:	8b                   	.byte 0x8b
  3d:	92                   	xchg   %eax,%edx
  3e:	f4                   	hlt
  3f:	15                   	.byte 0x15