bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): Released all slaves ================================================================== BUG: KASAN: use-after-free in free_netdev+0x590/0x620 net/core/dev.c:10694 Read of size 8 at addr ffff888075e6d160 by task kworker/u4:1/11 CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted 6.1.0-rc4-syzkaller-01123-gd82303df0648 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: netns cleanup_net 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:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 free_netdev+0x590/0x620 net/core/dev.c:10694 netdev_run_todo+0xb4e/0x1100 net/core/dev.c:10354 default_device_exit_batch+0x456/0x590 net/core/dev.c:11333 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:306 Allocated by task 9301: 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+0xa5/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0x5a/0xd0 mm/slab_common.c:968 kmalloc_array include/linux/slab.h:605 [inline] kcalloc include/linux/slab.h:636 [inline] veth_alloc_queues drivers/net/veth.c:1404 [inline] veth_dev_init+0x156/0x330 drivers/net/veth.c:1431 register_netdevice+0x573/0x1640 net/core/dev.c:9975 veth_newlink+0x33c/0x9a0 drivers/net/veth.c:1828 rtnl_newlink_create net/core/rtnetlink.c:3407 [inline] __rtnl_newlink+0x10c2/0x1840 net/core/rtnetlink.c:3624 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_sendto+0x23a/0x340 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __x64_sys_sendto+0xe1/0x1b0 net/socket.c:2125 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 11: 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:511 ____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:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3674 veth_free_queues drivers/net/veth.c:1420 [inline] veth_dev_free+0x37/0x70 drivers/net/veth.c:1442 netdev_run_todo+0x6bf/0x1100 net/core/dev.c:10352 default_device_exit_batch+0x456/0x590 net/core/dev.c:11333 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:306 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:481 kvfree_call_rcu+0x78/0x8f0 kernel/rcu/tree.c:3343 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1709 unregister_sysctl_table fs/proc/proc_sysctl.c:1747 [inline] unregister_sysctl_table+0xc4/0x190 fs/proc/proc_sysctl.c:1722 __devinet_sysctl_unregister net/ipv4/devinet.c:2609 [inline] devinet_sysctl_unregister net/ipv4/devinet.c:2637 [inline] inetdev_destroy net/ipv4/devinet.c:327 [inline] inetdev_event+0x1045/0x1650 net/ipv4/devinet.c:1602 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:10823 vti6_exit_batch_net+0x3a4/0x670 net/ipv6/ip6_vti.c:1188 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:306 Second to 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:481 call_rcu+0x9d/0x820 kernel/rcu/tree.c:2798 in6_dev_finish_destroy+0x172/0x1f0 net/ipv6/addrconf_core.c:271 in6_dev_put include/net/addrconf.h:380 [inline] in6_dev_put_clear include/net/addrconf.h:388 [inline] ip6_route_dev_notify+0x60c/0x7a0 net/ipv6/route.c:6299 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:10823 unregister_netdevice_many net/core/dev.c:10879 [inline] default_device_exit_batch+0x451/0x590 net/core/dev.c:11332 ops_exit_list+0x125/0x170 net/core/net_namespace.c:174 setup_net+0x9bd/0xe60 net/core/net_namespace.c:356 copy_net_ns+0x31b/0x6b0 net/core/net_namespace.c:483 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc5/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x449/0x920 kernel/fork.c:3188 __do_sys_unshare kernel/fork.c:3259 [inline] __se_sys_unshare kernel/fork.c:3257 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3257 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 The buggy address belongs to the object at ffff888075e6d000 which belongs to the cache kmalloc-cg-2k of size 2048 The buggy address is located 352 bytes inside of 2048-byte region [ffff888075e6d000, ffff888075e6d800) The buggy address belongs to the physical page: page:ffffea0001d79a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x75e68 head:ffffea0001d79a00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888022224381 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff88801204c140 raw: 0000000000000000 0000000000080008 00000001ffffffff ffff888022224381 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5341, tgid 5340 (syz-executor.4), ts 164191653504, free_ts 164035968881 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4288 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5555 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1794 [inline] allocate_slab+0x213/0x300 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3180 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279 slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x199/0x3e0 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc+0x4a/0xd0 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] kzalloc include/linux/slab.h:689 [inline] __register_sysctl_table+0x116/0x10a0 fs/proc/proc_sysctl.c:1337 __addrconf_sysctl_register+0x1db/0x3d0 net/ipv6/addrconf.c:7083 addrconf_sysctl_register net/ipv6/addrconf.c:7130 [inline] addrconf_sysctl_register+0x139/0x1d0 net/ipv6/addrconf.c:7119 ipv6_add_dev+0xa80/0x1320 net/ipv6/addrconf.c:450 addrconf_notify+0x874/0x1c80 net/ipv6/addrconf.c:3528 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] register_netdevice+0xfb4/0x1640 net/core/dev.c:10078 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483 __folio_put_large mm/swap.c:118 [inline] __folio_put+0x109/0x140 mm/swap.c:126 folio_put include/linux/mm.h:1159 [inline] put_page include/linux/mm.h:1211 [inline] __skb_frag_unref include/linux/skbuff.h:3387 [inline] skb_release_data+0x522/0x870 net/core/skbuff.c:791 skb_release_all net/core/skbuff.c:862 [inline] __kfree_skb+0x4f/0x70 net/core/skbuff.c:876 tcp_wmem_free_skb include/net/tcp.h:302 [inline] tcp_rtx_queue_purge net/ipv4/tcp.c:3060 [inline] tcp_write_queue_purge+0x617/0xcf0 net/ipv4/tcp.c:3073 tcp_v4_destroy_sock+0x125/0x7f0 net/ipv4/tcp_ipv4.c:2261 inet_csk_destroy_sock+0x19a/0x440 net/ipv4/inet_connection_sock.c:1157 __tcp_close+0xb96/0xf50 net/ipv4/tcp.c:3020 tcp_close+0x2d/0xc0 net/ipv4/tcp.c:3032 inet_release+0x132/0x270 net/ipv4/af_inet.c:428 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:489 __sock_release+0xcd/0x280 net/socket.c:650 sock_close+0x1c/0x20 net/socket.c:1365 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 Memory state around the buggy address: ffff888075e6d000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888075e6d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888075e6d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888075e6d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888075e6d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================