================================================================== BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:901 [inline] BUG: KASAN: slab-use-after-free in hlist_del_rcu include/linux/rculist.h:513 [inline] BUG: KASAN: slab-use-after-free in lockdep_unregister_key+0x417/0x460 kernel/locking/lockdep.c:6397 Write of size 8 at addr ffff8880808c5b68 by task kworker/1:19/7991 CPU: 1 PID: 7991 Comm: kworker/1:19 Not tainted 6.3.0-rc4-next-20230328-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/17/2023 Workqueue: events pwq_unbound_release_workfn Call Trace: __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 __hlist_del include/linux/list.h:901 [inline] hlist_del_rcu include/linux/rculist.h:513 [inline] lockdep_unregister_key+0x417/0x460 kernel/locking/lockdep.c:6397 wq_unregister_lockdep kernel/workqueue.c:3615 [inline] pwq_unbound_release_workfn+0x258/0x340 kernel/workqueue.c:3863 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 Allocated by task 5893: 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 __netdev_alloc_skb+0x74/0x410 net/core/skbuff.c:668 __netdev_alloc_skb_ip_align include/linux/skbuff.h:3201 [inline] netdev_alloc_skb_ip_align include/linux/skbuff.h:3211 [inline] batadv_iv_ogm_aggregate_new+0x106/0x4e0 net/batman-adv/bat_iv_ogm.c:558 batadv_iv_ogm_queue_add net/batman-adv/bat_iv_ogm.c:670 [inline] batadv_iv_ogm_schedule_buff+0x9b2/0x1520 net/batman-adv/bat_iv_ogm.c:833 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:868 [inline] batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:861 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x333/0x960 net/batman-adv/bat_iv_ogm.c:1712 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 5933: 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 batadv_forw_packet_free+0x1f0/0x270 net/batman-adv/send.c:471 batadv_iv_send_outstanding_bat_ogm_packet+0x2b0/0x960 net/batman-adv/bat_iv_ogm.c:1718 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 ffff8880808c5800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 872 bytes inside of freed 1024-byte region [ffff8880808c5800, ffff8880808c5c00) The buggy address belongs to the physical page: page:ffffea0002023000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x808c0 head:ffffea0002023000 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012441dc0 0000000000000000 dead000000000001 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5125, tgid 5125 (syz-executor.3), ts 295263905606, free_ts 0 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_node_track_caller+0x4f/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_add_rt2node net/ipv6/ip6_fib.c:1251 [inline] fib6_add+0x200d/0x4080 net/ipv6/ip6_fib.c:1477 __ip6_ins_rt net/ipv6/route.c:1302 [inline] ip6_route_add+0x8f/0x150 net/ipv6/route.c:3840 addrconf_prefix_route+0x309/0x520 net/ipv6/addrconf.c:2425 fixup_permanent_addr net/ipv6/addrconf.c:3500 [inline] addrconf_permanent_addr net/ipv6/addrconf.c:3524 [inline] addrconf_notify+0x1157/0x19f0 net/ipv6/addrconf.c:3596 notifier_call_chain+0xb6/0x3c0 kernel/notifier.c:93 page_owner free stack trace missing Memory state around the buggy address: ffff8880808c5a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880808c5a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880808c5b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880808c5b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880808c5c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================