==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3ee7/0x56d0 kernel/locking/lockdep.c:4925
Read of size 8 at addr ffff888022b81418 by task syz-executor.1/10632
CPU: 0 PID: 10632 Comm: syz-executor.1 Not tainted 6.2.0-rc4-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:306 [inline]
print_report+0x15e/0x461 mm/kasan/report.c:417
kasan_report+0xbf/0x1f0 mm/kasan/report.c:517
__lock_acquire+0x3ee7/0x56d0 kernel/locking/lockdep.c:4925
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162
p9_tag_remove net/9p/client.c:390 [inline]
p9_req_put net/9p/client.c:398 [inline]
p9_req_put+0xca/0x250 net/9p/client.c:395
req_done+0x1e2/0x2e0 net/9p/trans_virtio.c:147
vring_interrupt drivers/virtio/virtio_ring.c:2470 [inline]
vring_interrupt+0x2a1/0x3d0 drivers/virtio/virtio_ring.c:2445
__handle_irq_event_percpu+0x264/0x970 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+0x263/0xd00 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+0xa1/0x210 arch/x86/kernel/irq.c:250
common_interrupt+0xa8/0xd0 arch/x86/kernel/irq.c:240
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:640
RIP: 0010:__fib6_clean_all+0x132/0x2a0 net/ipv6/ip6_fib.c:2252
Code: 89 ef e8 11 59 78 01 48 89 d8 48 b9 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 08 00 0f 85 82 00 00 00 48 8b 1b 48 85 db 75 ab 69 fb ef f8 48 8b 5c 24 08 bf 00 01 00 00 8d 73 01 48 83 c3 01
RSP: 0018:ffffc90003baef10 EFLAGS: 00000246
RAX: 1ffff1100df19023 RBX: 0000000000000000 RCX: ffffc90004f56000
RDX: dffffc0000000000 RSI: ffffffff889087f7 RDI: 0000000000000005
RBP: ffff88806ff70100 R08: 0000000000000005 R09: 0000000000000100
R10: 0000000000000023 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc90003baef88
rt6_sync_up+0xd2/0x170 net/ipv6/route.c:4780
addrconf_notify+0x155d/0x1c80 net/ipv6/addrconf.c:3606
notifier_call_chain+0xb5/0x200 kernel/notifier.c:87
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1944
netdev_state_change net/core/dev.c:1319 [inline]
netdev_state_change+0x104/0x130 net/core/dev.c:1312
do_setlink+0x3053/0x3bb0 net/core/rtnetlink.c:3054
rtnl_group_changelink net/core/rtnetlink.c:3344 [inline]
__rtnl_newlink+0xb90/0x1840 net/core/rtnetlink.c:3600
rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3637
rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6141
netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2564
netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1356
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1932
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2476
___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2559
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1008a8c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1009866168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1008bac050 RCX: 00007f1008a8c0c9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00007f1008ae7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdc146f74f R14: 00007f1009866300 R15: 0000000000022000
Allocated by task 10634:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
____kasan_kmalloc mm/kasan/common.c:330 [inline]
__kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:380
kmalloc include/linux/slab.h:580 [inline]
p9_client_create+0xb3/0x1070 net/9p/client.c:975
v9fs_session_init+0x1e6/0x18b0 fs/9p/v9fs.c:407
v9fs_mount+0xbe/0xca0 fs/9p/vfs_super.c:125
legacy_get_tree+0x109/0x220 fs/fs_context.c:610
vfs_get_tree+0x8d/0x2f0 fs/super.c:1489
do_new_mount fs/namespace.c:3145 [inline]
path_mount+0x132a/0x1e20 fs/namespace.c:3475
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount fs/namespace.c:3674 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3674
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 10634:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:518
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:177 [inline]
__cache_free mm/slab.c:3394 [inline]
__do_kmem_cache_free mm/slab.c:3580 [inline]
__kmem_cache_free+0xcd/0x3b0 mm/slab.c:3587
p9_client_create+0x7aa/0x1070 net/9p/client.c:1046
v9fs_session_init+0x1e6/0x18b0 fs/9p/v9fs.c:407
v9fs_mount+0xbe/0xca0 fs/9p/vfs_super.c:125
legacy_get_tree+0x109/0x220 fs/fs_context.c:610
vfs_get_tree+0x8d/0x2f0 fs/super.c:1489
do_new_mount fs/namespace.c:3145 [inline]
path_mount+0x132a/0x1e20 fs/namespace.c:3475
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount fs/namespace.c:3674 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3674
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Last potentially related work creation:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
__kasan_record_aux_stack+0x7b/0x90 mm/kasan/generic.c:488
__call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2755
destroy_workqueue+0x476/0x810 kernel/workqueue.c:4469
wg_destruct+0x24b/0x400 drivers/net/wireguard/device.c:257
netdev_run_todo+0x6bf/0x1100 net/core/dev.c:10352
rtnl_unlock net/core/rtnetlink.c:148 [inline]
rtnetlink_rcv_msg+0x44b/0xca0 net/core/rtnetlink.c:6142
netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2564
netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1356
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1932
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2476
___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2559
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Second to last potentially related work creation:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
__kasan_record_aux_stack+0x7b/0x90 mm/kasan/generic.c:488
kvfree_call_rcu+0x78/0x8f0 kernel/rcu/tree.c:3376
ma_put net/ipv6/mcast.c:869 [inline]
ma_put+0x11c/0x180 net/ipv6/mcast.c:865
__ipv6_dev_mc_dec+0x27c/0x340 net/ipv6/mcast.c:982
ipv6_mc_destroy_dev+0x2ca/0x630 net/ipv6/mcast.c:2800
addrconf_ifdown.isra.0+0x12c2/0x1920 net/ipv6/addrconf.c:3893
addrconf_notify+0x109/0x1c80 net/ipv6/addrconf.c:3673
notifier_call_chain+0xb5/0x200 kernel/notifier.c:87
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1944
call_netdevice_notifiers_extack net/core/dev.c:1982 [inline]
call_netdevice_notifiers net/core/dev.c:1996 [inline]
unregister_netdevice_many_notify+0xa2b/0x19e0 net/core/dev.c:10839
unregister_netdevice_many net/core/dev.c:10895 [inline]
default_device_exit_batch+0x451/0x590 net/core/dev.c:11348
ops_exit_list+0x125/0x170 net/core/net_namespace.c:174
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
The buggy address belongs to the object at ffff888022b81400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
512-byte region [ffff888022b81400, ffff888022b81600)
The buggy address belongs to the physical page:
page:ffffea00008ae040 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22b81
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff888012440600 ffffea00006a9f50 ffffea00008dfb90
raw: 0000000000000000 ffff888022b81000 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 0x242220(__GFP_HIGH|__GFP_ATOMIC|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 5174, tgid 5174 (syz-executor.0), ts 216594438974, free_ts 214448984118
prep_new_page mm/page_alloc.c:2531 [inline]
get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283
__alloc_pages_slowpath.constprop.0+0x36b/0x23d0 mm/page_alloc.c:5084
__alloc_pages+0x4aa/0x5b0 mm/page_alloc.c:5562
__alloc_pages_node include/linux/gfp.h:237 [inline]
kmem_getpages mm/slab.c:1363 [inline]
cache_grow_begin+0x94/0x390 mm/slab.c:2574
cache_alloc_refill+0x27f/0x380 mm/slab.c:2947
____cache_alloc mm/slab.c:3023 [inline]
____cache_alloc mm/slab.c:3006 [inline]
__do_cache_alloc mm/slab.c:3206 [inline]
slab_alloc_node mm/slab.c:3254 [inline]
__kmem_cache_alloc_node+0x44f/0x510 mm/slab.c:3544
kmalloc_trace+0x26/0x60 mm/slab_common.c:1062
kmalloc include/linux/slab.h:580 [inline]
kzalloc include/linux/slab.h:720 [inline]
fib6_info_alloc+0xc9/0x220 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x341/0x18f0 net/ipv6/route.c:3749
addrconf_f6i_alloc+0x381/0x620 net/ipv6/route.c:4571
fixup_permanent_addr net/ipv6/addrconf.c:3461 [inline]
addrconf_permanent_addr net/ipv6/addrconf.c:3500 [inline]
addrconf_notify+0x1053/0x1c80 net/ipv6/addrconf.c:3572
notifier_call_chain+0xb5/0x200 kernel/notifier.c:87
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1944
call_netdevice_notifiers_extack net/core/dev.c:1982 [inline]
call_netdevice_notifiers net/core/dev.c:1996 [inline]
__dev_notify_flags+0x120/0x2d0 net/core/dev.c:8569
dev_change_flags+0x11b/0x170 net/core/dev.c:8607
do_setlink+0x9f1/0x3bb0 net/core/rtnetlink.c:2827
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1446 [inline]
free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496
free_unref_page_prepare mm/page_alloc.c:3369 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3464
slab_destroy mm/slab.c:1619 [inline]
slabs_destroy+0x85/0xc0 mm/slab.c:1639
cache_flusharray mm/slab.c:3365 [inline]
___cache_free+0x2ac/0x3d0 mm/slab.c:3428
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x4f/0x1a0 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:302
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:761 [inline]
slab_alloc_node mm/slab.c:3261 [inline]
__kmem_cache_alloc_node+0x26b/0x510 mm/slab.c:3544
kmalloc_trace+0x26/0x60 mm/slab_common.c:1062
kmalloc include/linux/slab.h:580 [inline]
kzalloc include/linux/slab.h:720 [inline]
kobject_uevent_env+0x234/0x1620 lib/kobject_uevent.c:524
__kobject_del+0x160/0x1f0 lib/kobject.c:585
kobject_cleanup lib/kobject.c:664 [inline]
kobject_release lib/kobject.c:704 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x2f1/0x4d0 lib/kobject.c:721
net_rx_queue_update_kobjects+0x3f7/0x510 net/core/net-sysfs.c:1128
netif_set_real_num_rx_queues+0x165/0x210 net/core/dev.c:2934
veth_init_queues drivers/net/veth.c:1693 [inline]
veth_init_queues+0x14d/0x190 drivers/net/veth.c:1683
veth_newlink+0x687/0x9a0 drivers/net/veth.c:1814
Memory state around the buggy address:
ffff888022b81300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888022b81380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888022b81400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888022b81480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888022b81500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 89 ef mov %ebp,%edi
2: e8 11 59 78 01 callq 0x1785918
7: 48 89 d8 mov %rbx,%rax
a: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
11: fc ff df
14: 48 c1 e8 03 shr $0x3,%rax
18: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1)
1c: 0f 85 82 00 00 00 jne 0xa4
22: 48 8b 1b mov (%rbx),%rbx
25: 48 85 db test %rbx,%rbx
28: 75 ab jne 0xffffffd5
* 2a: e8 69 fb ef f8 callq 0xf8effb98 <-- trapping instruction
2f: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx
34: bf 00 01 00 00 mov $0x100,%edi
39: 8d 73 01 lea 0x1(%rbx),%esi
3c: 48 83 c3 01 add $0x1,%rbx