batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! ================================================================== IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready BUG: KASAN: use-after-free in tcp_highest_sack_seq include/net/tcp.h:1775 [inline] BUG: KASAN: use-after-free in tcp_highest_sack_seq include/net/tcp.h:1767 [inline] BUG: KASAN: use-after-free in tcp_check_sack_reordering+0x33c/0x3a0 net/ipv4/tcp_input.c:877 Read of size 4 at addr ffff88808aeeb5a8 by task syz-executor441/8278 CPU: 0 PID: 8278 Comm: syz-executor441 Not tainted 4.19.97-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 batman_adv: batadv0: Interface activated: batadv_slave_1 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready tcp_highest_sack_seq include/net/tcp.h:1775 [inline] tcp_highest_sack_seq include/net/tcp.h:1767 [inline] tcp_check_sack_reordering+0x33c/0x3a0 net/ipv4/tcp_input.c:877 IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready tcp_try_undo_partial net/ipv4/tcp_input.c:2716 [inline] tcp_fastretrans_alert+0x1070/0x2550 net/ipv4/tcp_input.c:2833 tcp_ack+0x2859/0x5120 net/ipv4/tcp_input.c:3688 device veth0_macvtap entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready tcp_rcv_established+0x725/0x1f10 net/ipv4/tcp_input.c:5638 device veth1_macvtap entered promiscuous mode tcp_v4_do_rcv+0x61f/0x8d0 net/ipv4/tcp_ipv4.c:1535 sk_backlog_rcv include/net/sock.h:946 [inline] __release_sock+0x129/0x390 net/core/sock.c:2339 IPv6: ADDRCONF(NETDEV_UP): macsec0: link is not ready release_sock+0x59/0x1c0 net/core/sock.c:2855 sk_stream_wait_memory+0x590/0xe50 net/core/stream.c:145 IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready tcp_sendmsg_locked+0xdec/0x3290 net/ipv4/tcp.c:1413 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! tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1454 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:798 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 __sys_sendto+0x262/0x380 net/socket.c:1787 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1795 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x449cd9 Code: e8 1c e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0f 83 8b 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4b0c912d88 EFLAGS: 00000246 ORIG_RAX: 000000000000002c batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 RAX: ffffffffffffffda RBX: 00000000006e6a08 RCX: 0000000000449cd9 RDX: ffffffffffffff67 RSI: 0000000020000640 RDI: 0000000000000003 RBP: 00000000006e6a00 R08: 0000000000000000 R09: ffffffffffffff4f R10: 00000000040007bd R11: 0000000000000246 R12: 00000000006e6a0c R13: 0000000001001eac R14: 0000000400000003 R15: 01001eac01131eac Allocated by task 8278: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc_node+0x144/0x710 mm/slab.c:3649 __alloc_skb+0xd5/0x5f0 net/core/skbuff.c:193 alloc_skb_fclone include/linux/skbuff.h:1037 [inline] sk_stream_alloc_skb+0xc8/0x860 net/ipv4/tcp.c:874 tcp_sendmsg_locked+0xc9d/0x3290 net/ipv4/tcp.c:1303 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1454 IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 __sys_sendto+0x262/0x380 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1795 batman_adv: batadv0: Interface activated: batadv_slave_0 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8281: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3765 kfree_skbmem+0xad/0x160 net/core/skbuff.c:607 __kfree_skb+0x1e/0x30 net/core/skbuff.c:646 sk_eat_skb include/net/sock.h:2421 [inline] tcp_recvmsg+0x133c/0x29a0 net/ipv4/tcp.c:2150 inet_recvmsg+0x136/0x5f0 net/ipv4/af_inet.c:830 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg net/socket.c:802 [inline] sock_recvmsg+0xce/0x110 net/socket.c:798 __sys_recvfrom+0x1ff/0x350 net/socket.c:1844 __do_sys_recvfrom net/socket.c:1862 [inline] __se_sys_recvfrom net/socket.c:1858 [inline] __x64_sys_recvfrom+0xe1/0x1a0 net/socket.c:1858 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 The buggy address belongs to the object at ffff88808aeeb580 which belongs to the cache skbuff_fclone_cache of size 472 The buggy address is located 40 bytes inside of 472-byte region [ffff88808aeeb580, ffff88808aeeb758) The buggy address belongs to the page: page:ffffea00022bbac0 count:1 mapcount:0 mapping:ffff8880a98c6c40 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea0002487f48 ffffea000220dec8 ffff8880a98c6c40 raw: 0000000000000000 ffff88808aeeb080 0000000100000006 0000000000000000 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808aeeb480: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff88808aeeb500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88808aeeb580: 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:3e) already exists on: batadv_slave_1 ^ ffff88808aeeb600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808aeeb680: 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! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready