device veth1_macvtap entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macsec0: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready ================================================================== IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready BUG: KASAN: use-after-free in xfrm6_tunnel_free_spi net/ipv6/xfrm6_tunnel.c:208 [inline] BUG: KASAN: use-after-free in xfrm6_tunnel_destroy+0x519/0x5c0 net/ipv6/xfrm6_tunnel.c:303 Read of size 8 at addr ffff888052865890 by task kworker/1:0/18 CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.177-syzkaller #0 IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events xfrm_state_gc_task Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! xfrm6_tunnel_free_spi net/ipv6/xfrm6_tunnel.c:208 [inline] xfrm6_tunnel_destroy+0x519/0x5c0 net/ipv6/xfrm6_tunnel.c:303 xfrm_state_gc_destroy net/xfrm/xfrm_state.c:449 [inline] xfrm_state_gc_task+0x4ad/0x7d0 net/xfrm/xfrm_state.c:472 process_one_work+0x813/0x1540 kernel/workqueue.c:2116 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! worker_thread+0x5d1/0x1070 kernel/workqueue.c:2250 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 kthread+0x30d/0x420 kernel/kthread.c:232 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 Allocated by task 6353: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15b/0x7c0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:661 [inline] ops_init+0xe7/0x3c0 net/core/net_namespace.c:108 setup_net+0x22f/0x500 net/core/net_namespace.c:295 IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready copy_net_ns+0x19b/0x440 net/core/net_namespace.c:419 create_new_namespaces+0x375/0x730 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xa5/0x1e0 kernel/nsproxy.c:206 SYSC_unshare kernel/fork.c:2391 [inline] SyS_unshare+0x2ea/0x740 kernel/fork.c:2341 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 batman_adv: batadv0: Interface activated: batadv_slave_0 Freed by task 6270: batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 ops_free net/core/net_namespace.c:132 [inline] ops_free_list.part.0+0x1f9/0x330 net/core/net_namespace.c:154 ops_free_list net/core/net_namespace.c:152 [inline] cleanup_net+0x453/0x820 net/core/net_namespace.c:488 process_one_work+0x813/0x1540 kernel/workqueue.c:2116 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! worker_thread+0x5d1/0x1070 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 The buggy address belongs to the object at ffff888052865640 which belongs to the cache kmalloc-8192 of size 8192 The buggy address is located 592 bytes inside of 8192-byte region [ffff888052865640, ffff888052867640) The buggy address belongs to the page: batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 page:ffffea00014a1900 count:1 mapcount:0 mapping:ffff888052865640 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff888052865640 0000000000000000 0000000100000001 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! raw: ffffea00014ffe20 ffffea00014a2120 ffff88812fe44080 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888052865780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888052865800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888052865880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 ^ ffff888052865900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888052865980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!