syzbot

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BUG: KASAN: slab-use-after-free in lockdep_unregister_key+0x3d8/0x460 kernel/locking/lockdep.c:6395
Read of size 8 at addr ffff88803587e360 by task kworker/1:12/6568

CPU: 1 PID: 6568 Comm: kworker/1:12 Not tainted 6.3.0-rc4-next-20230328-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: events devlink_release
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
 print_report mm/kasan/report.c:462 [inline]
 kasan_report+0x11c/0x130 mm/kasan/report.c:572
 lockdep_unregister_key+0x3d8/0x460 kernel/locking/lockdep.c:6395
 devlink_release+0x2a/0x40 net/devlink/core.c:93
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x33e/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Allocated by task 35:
 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:374 [inline]
 ____kasan_kmalloc mm/kasan/common.c:333 [inline]
 __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:196 [inline]
 __do_kmalloc_node mm/slab_common.c:966 [inline]
 __kmalloc_node_track_caller+0x5f/0x1a0 mm/slab_common.c:986
 kmalloc_reserve+0xf0/0x270 net/core/skbuff.c:535
 __alloc_skb+0x129/0x330 net/core/skbuff.c:604
 alloc_skb include/linux/skbuff.h:1275 [inline]
 nlmsg_new include/net/netlink.h:1003 [inline]
 inet6_rt_notify+0xf0/0x2b0 net/ipv6/route.c:6166
 fib6_del_route net/ipv6/ip6_fib.c:1993 [inline]
 fib6_del+0xfbb/0x1670 net/ipv6/ip6_fib.c:2028
 fib6_clean_node+0x39c/0x5c0 net/ipv6/ip6_fib.c:2190
 fib6_walk_continue+0x487/0x8e0 net/ipv6/ip6_fib.c:2112
 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2160
 fib6_clean_tree+0xdb/0x120 net/ipv6/ip6_fib.c:2240
 __fib6_clean_all+0x107/0x2e0 net/ipv6/ip6_fib.c:2256
 rt6_sync_down_dev net/ipv6/route.c:4887 [inline]
 rt6_disable_ip+0x804/0x9e0 net/ipv6/route.c:4892
 addrconf_ifdown.isra.0+0x11a/0x1940 net/ipv6/addrconf.c:3755
 addrconf_notify+0x106/0x19f0 net/ipv6/addrconf.c:3678
 notifier_call_chain+0xb6/0x3c0 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1937
 call_netdevice_notifiers_extack net/core/dev.c:1975 [inline]
 call_netdevice_notifiers net/core/dev.c:1989 [inline]
 dev_close_many+0x309/0x630 net/core/dev.c:1530
 unregister_netdevice_many_notify+0x414/0x1910 net/core/dev.c:10816
 xfrmi_exit_batch_net+0x2c2/0x3e0 net/xfrm/xfrm_interface_core.c:983
 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175
 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:614
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x33e/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Freed by task 35:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
 slab_free mm/slub.c:3787 [inline]
 __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3800
 skb_kfree_head net/core/skbuff.c:856 [inline]
 skb_free_head+0x108/0x1a0 net/core/skbuff.c:868
 skb_release_data+0x57a/0x820 net/core/skbuff.c:897
 skb_release_all net/core/skbuff.c:962 [inline]
 __kfree_skb net/core/skbuff.c:976 [inline]
 consume_skb net/core/skbuff.c:1189 [inline]
 consume_skb+0xd0/0x170 net/core/skbuff.c:1183
 netlink_broadcast+0x360/0xd90 net/netlink/af_netlink.c:1538
 nlmsg_multicast include/net/netlink.h:1083 [inline]
 nlmsg_notify+0x93/0x280 net/netlink/af_netlink.c:2615
 inet6_rt_notify+0x1f4/0x2b0 net/ipv6/route.c:6178
 fib6_del_route net/ipv6/ip6_fib.c:1993 [inline]
 fib6_del+0xfbb/0x1670 net/ipv6/ip6_fib.c:2028
 fib6_clean_node+0x39c/0x5c0 net/ipv6/ip6_fib.c:2190
 fib6_walk_continue+0x487/0x8e0 net/ipv6/ip6_fib.c:2112
 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2160
 fib6_clean_tree+0xdb/0x120 net/ipv6/ip6_fib.c:2240
 __fib6_clean_all+0x107/0x2e0 net/ipv6/ip6_fib.c:2256
 rt6_sync_down_dev net/ipv6/route.c:4887 [inline]
 rt6_disable_ip+0x804/0x9e0 net/ipv6/route.c:4892
 addrconf_ifdown.isra.0+0x11a/0x1940 net/ipv6/addrconf.c:3755
 addrconf_notify+0x106/0x19f0 net/ipv6/addrconf.c:3678
 notifier_call_chain+0xb6/0x3c0 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1937
 call_netdevice_notifiers_extack net/core/dev.c:1975 [inline]
 call_netdevice_notifiers net/core/dev.c:1989 [inline]
 dev_close_many+0x309/0x630 net/core/dev.c:1530
 unregister_netdevice_many_notify+0x414/0x1910 net/core/dev.c:10816
 xfrmi_exit_batch_net+0x2c2/0x3e0 net/xfrm/xfrm_interface_core.c:983
 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175
 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:614
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x33e/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491
 kvfree_call_rcu+0x70/0xad0 kernel/rcu/tree.c:3331
 neigh_destroy+0x433/0x660 net/core/neighbour.c:910
 neigh_release include/net/neighbour.h:447 [inline]
 neigh_cleanup_and_release net/core/neighbour.c:103 [inline]
 neigh_periodic_work+0x726/0xb80 net/core/neighbour.c:994
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x33e/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff88803587e000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 864 bytes inside of
 freed 1024-byte region [ffff88803587e000, ffff88803587e400)

The buggy address belongs to the physical page:
page:ffffea0000d61e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x35878
head:ffffea0000d61e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000010200 ffff888012441dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 5184, tgid 5184 (kworker/1:4), ts 268996934156, free_ts 268996560430
 prep_new_page mm/page_alloc.c:1729 [inline]
 get_page_from_freelist+0xf75/0x2aa0 mm/page_alloc.c:3493
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4759
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x28e/0x380 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3491
 __do_kmalloc_node mm/slab_common.c:965 [inline]
 __kmalloc+0x4e/0x190 mm/slab_common.c:979
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:680 [inline]
 neigh_alloc net/core/neighbour.c:486 [inline]
 ___neigh_create+0x156f/0x2a40 net/core/neighbour.c:640
 ip6_finish_output2+0xfe9/0x1560 net/ipv6/ip6_output.c:125
 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
 ip6_finish_output+0x694/0x1170 net/ipv6/ip6_output.c:206
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:444 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0xa63/0x1850 net/ipv6/ndisc.c:508
 ndisc_send_ns+0xaa/0x130 net/ipv6/ndisc.c:666
 addrconf_dad_work+0xbf4/0x1390 net/ipv6/addrconf.c:4176
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1302 [inline]
 free_unref_page_prepare+0x4d8/0xb80 mm/page_alloc.c:2555
 free_unref_page+0x33/0x370 mm/page_alloc.c:2650
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
 qlink_free mm/kasan/quarantine.c:166 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:711 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 __kmem_cache_alloc_node+0x17c/0x320 mm/slub.c:3491
 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057
 kmalloc include/linux/slab.h:559 [inline]
 kzalloc include/linux/slab.h:680 [inline]
 mca_alloc net/ipv6/mcast.c:880 [inline]
 __ipv6_dev_mc_inc+0x2bb/0xc60 net/ipv6/mcast.c:936
 addrconf_join_solict net/ipv6/addrconf.c:2180 [inline]
 addrconf_join_solict net/ipv6/addrconf.c:2172 [inline]
 addrconf_dad_begin net/ipv6/addrconf.c:3996 [inline]
 addrconf_dad_work+0xc5a/0x1390 net/ipv6/addrconf.c:4121
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x33e/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Memory state around the buggy address:
 ffff88803587e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88803587e280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803587e300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff88803587e380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88803587e400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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