BUG: KASAN: use-after-free in __lock_acquire+0x3ee7/0x56d0 kernel/locking/lockdep.c:4923
Read of size 8 at addr ffff88801be36818 by task udevd/3132

CPU: 0 PID: 3132 Comm: udevd Not tainted 6.0.0-rc7-syzkaller-00239-gb357fd1c2afc #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433
 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
 __lock_acquire+0x3ee7/0x56d0 kernel/locking/lockdep.c:4923
 lock_acquire kernel/locking/lockdep.c:5666 [inline]
 lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
 p9_tag_remove net/9p/client.c:367 [inline]
 p9_req_put net/9p/client.c:375 [inline]
 p9_req_put+0xc6/0x250 net/9p/client.c:372
 req_done+0x1de/0x2e0 net/9p/trans_virtio.c:148
 vring_interrupt drivers/virtio/virtio_ring.c:2462 [inline]
 vring_interrupt+0x29d/0x3d0 drivers/virtio/virtio_ring.c:2437
 __handle_irq_event_percpu+0x227/0x870 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0xa7/0x1e0 kernel/irq/handle.c:210
 handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:819
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 handle_irq arch/x86/kernel/irq.c:231 [inline]
 __common_interrupt+0x9d/0x210 arch/x86/kernel/irq.c:250
 common_interrupt+0xa4/0xc0 arch/x86/kernel/irq.c:240
 </IRQ>
 <TASK>
 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640
RIP: 0010:write_comp_data+0x85/0x90 kernel/kcov.c:255
Code: 00 00 4a 8d 34 dd 28 00 00 00 48 39 f2 72 1b 48 83 c7 01 48 89 38 4c 89 44 30 e0 4c 89 4c 30 e8 4c 89 54 30 f0 4a 89 4c d8 20 <c3> 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 40 0f b6 d6 40 0f b6
RSP: 0018:ffffc90002e9fd48 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000074a4fb33 RCX: ffffffff81fbeb37
RDX: ffff88801a814200 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88801c876d98
R13: ffff8880450712f8 R14: 0000000000000001 R15: ffffffff8a46d720
 kernfs_dir_pos+0x37/0x2a0 fs/kernfs/dir.c:1694
 kernfs_dir_next_pos fs/kernfs/dir.c:1726 [inline]
 kernfs_fop_readdir+0x3e1/0x910 fs/kernfs/dir.c:1758
 iterate_dir+0x56a/0x6f0 fs/readdir.c:65
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __x64_sys_getdents64+0x13a/0x2c0 fs/readdir.c:354
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f08794ff097
Code: 00 00 0f 05 eb b3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 81 fa ff ff ff 7f b8 ff ff ff 7f 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 b1 5d 0f 00 f7 d8 64 89 02 48
RSP: 002b:00007fff92f3ae18 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000561813fc10a0 RCX: 00007f08794ff097
RDX: 0000000000008000 RSI: 0000561813fc10d0 RDI: 000000000000000c
RBP: 0000561813fc10d0 R08: 0000000000000030 R09: 00007f08795f5a60
R10: 0000000000000020 R11: 0000000000000293 R12: fffffffffffffe68
R13: 0000561813fc10a4 R14: 0000000000000016 R15: 0000000000000000
 </TASK>

Allocated by task 6494:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 ____kasan_kmalloc mm/kasan/common.c:516 [inline]
 ____kasan_kmalloc mm/kasan/common.c:475 [inline]
 __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:525
 kasan_kmalloc include/linux/kasan.h:234 [inline]
 kmem_cache_alloc_trace+0x25a/0x460 mm/slab.c:3559
 kmalloc include/linux/slab.h:600 [inline]
 p9_client_create+0xaf/0x1070 net/9p/client.c:934
 v9fs_session_init+0x1e2/0x1810 fs/9p/v9fs.c:408
 v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1530
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 6494:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:367 [inline]
 ____kasan_slab_free+0x13d/0x1a0 mm/kasan/common.c:329
 kasan_slab_free include/linux/kasan.h:200 [inline]
 __cache_free mm/slab.c:3418 [inline]
 kfree+0x173/0x390 mm/slab.c:3786
 p9_client_create+0x7a6/0x1070 net/9p/client.c:1005
 v9fs_session_init+0x1e2/0x1810 fs/9p/v9fs.c:408
 v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1530
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0x7e/0x90 mm/kasan/generic.c:348
 insert_work+0x48/0x350 kernel/workqueue.c:1358
 __queue_work+0x625/0x1210 kernel/workqueue.c:1517
 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571

Second to last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0x7e/0x90 mm/kasan/generic.c:348
 insert_work+0x48/0x350 kernel/workqueue.c:1358
 __queue_work+0x625/0x1210 kernel/workqueue.c:1517
 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571

The buggy address belongs to the object at ffff88801be36800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff88801be36800, ffff88801be36a00)

The buggy address belongs to the physical page:
page:ffffea00006f8d80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1be36
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea000057f8c8 ffffea00004a1208 ffff888011840600
raw: 0000000000000000 ffff88801be36000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2c20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_THISNODE), pid 3712, tgid 3712 (syz-executor.1), ts 237375874911, free_ts 237341287271
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages_slowpath.constprop.0+0x34d/0x2300 mm/page_alloc.c:5084
 __alloc_pages+0x43d/0x510 mm/page_alloc.c:5562
 __alloc_pages_node include/linux/gfp.h:243 [inline]
 kmem_getpages mm/slab.c:1363 [inline]
 cache_grow_begin+0x75/0x360 mm/slab.c:2569
 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942
 ____cache_alloc mm/slab.c:3018 [inline]
 ____cache_alloc mm/slab.c:3001 [inline]
 slab_alloc_node mm/slab.c:3220 [inline]
 kmem_cache_alloc_node_trace+0x50a/0x570 mm/slab.c:3601
 __do_kmalloc_node mm/slab.c:3623 [inline]
 __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3638
 kmalloc_reserve net/core/skbuff.c:362 [inline]
 __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:434
 alloc_skb include/linux/skbuff.h:1257 [inline]
 alloc_uevent_skb+0x7b/0x210 lib/kobject_uevent.c:290
 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline]
 kobject_uevent_net_broadcast lib/kobject_uevent.c:412 [inline]
 kobject_uevent_env+0x110a/0x1640 lib/kobject_uevent.c:593
 rx_queue_add_kobject net/core/net-sysfs.c:1074 [inline]
 net_rx_queue_update_kobjects+0xe9/0x510 net/core/net-sysfs.c:1114
 register_queue_kobjects net/core/net-sysfs.c:1774 [inline]
 netdev_register_kobject+0x275/0x400 net/core/net-sysfs.c:2019
 register_netdevice+0xe01/0x1680 net/core/dev.c:10070
 veth_newlink+0x4d6/0x9a0 drivers/net/veth.c:1795
 rtnl_newlink_create net/core/rtnetlink.c:3363 [inline]
 __rtnl_newlink+0x1087/0x17e0 net/core/rtnetlink.c:3580
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3593
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1449 [inline]
 free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476
 slab_destroy mm/slab.c:1615 [inline]
 slabs_destroy+0x89/0xc0 mm/slab.c:1635
 cache_flusharray mm/slab.c:3389 [inline]
 ___cache_free+0x2a8/0x3d0 mm/slab.c:3452
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x4f/0x1b0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:447
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc mm/slab.c:3294 [inline]
 kmem_cache_alloc_trace+0x212/0x460 mm/slab.c:3557
 kmalloc include/linux/slab.h:600 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 kset_create lib/kobject.c:937 [inline]
 kset_create_and_add+0x4b/0x1a0 lib/kobject.c:980
 register_queue_kobjects net/core/net-sysfs.c:1766 [inline]
 netdev_register_kobject+0x1c6/0x400 net/core/net-sysfs.c:2019
 register_netdevice+0xe01/0x1680 net/core/dev.c:10070
 veth_newlink+0x33f/0x9a0 drivers/net/veth.c:1764
 rtnl_newlink_create net/core/rtnetlink.c:3363 [inline]
 __rtnl_newlink+0x1087/0x17e0 net/core/rtnetlink.c:3580
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3593
 rtnetlink_rcv_msg+0x43a/0xca0 net/core/rtnetlink.c:6090
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2501

Memory state around the buggy address:
 ffff88801be36700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801be36780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801be36800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88801be36880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801be36900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	4a 8d 34 dd 28 00 00 	lea    0x28(,%r11,8),%rsi
   9:	00
   a:	48 39 f2             	cmp    %rsi,%rdx
   d:	72 1b                	jb     0x2a
   f:	48 83 c7 01          	add    $0x1,%rdi
  13:	48 89 38             	mov    %rdi,(%rax)
  16:	4c 89 44 30 e0       	mov    %r8,-0x20(%rax,%rsi,1)
  1b:	4c 89 4c 30 e8       	mov    %r9,-0x18(%rax,%rsi,1)
  20:	4c 89 54 30 f0       	mov    %r10,-0x10(%rax,%rsi,1)
  25:	4a 89 4c d8 20       	mov    %rcx,0x20(%rax,%r11,8)
* 2a:	c3                   	retq <-- trapping instruction
  2b:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
  32:	00 00 00
  35:	48 8b 0c 24          	mov    (%rsp),%rcx
  39:	40 0f b6 d6          	movzbl %sil,%edx
  3d:	40                   	rex
  3e:	0f                   	.byte 0xf
  3f:	b6                   	.byte 0xb6