batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000024: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000120-0x0000000000000127] CPU: 1 UID: 0 PID: 21559 Comm: syz.3.3841 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__fib6_drop_pcpu_from+0x1f0/0x3b0 net/ipv6/ip6_fib.c:993 Code: 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 ef e8 b7 10 19 f8 49 8b 6d 00 48 85 ed 74 2f 48 81 c5 90 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 ef e8 91 10 19 f8 48 8b 45 00 48 3b 44 RSP: 0018:ffffc900046ce190 EFLAGS: 00010207 RAX: 0000000000000024 RBX: ffffffff8d9aedd0 RCX: ffff88802e6a8000 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000124 R08: ffffffff8a0e05b6 R09: ffffffff8df41aa0 R10: dffffc0000000000 R11: fffffbfff1f0444f R12: 0000000000000000 R13: ffffe8ffffc38908 R14: dffffc0000000000 R15: ffff888057563d20 FS: 00007efc372026c0(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc96549ceb8 CR3: 0000000054be2000 CR4: 00000000003526f0 Call Trace: fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1027 [inline] fib6_purge_rt+0x10b/0x910 net/ipv6/ip6_fib.c:1038 fib6_del_route net/ipv6/ip6_fib.c:2046 [inline] fib6_del+0xeab/0x1560 net/ipv6/ip6_fib.c:2091 fib6_clean_node+0x29f/0x5c0 net/ipv6/ip6_fib.c:2253 fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2175 fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2223 fib6_clean_tree net/ipv6/ip6_fib.c:2303 [inline] __fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2319 rt6_sync_down_dev net/ipv6/route.c:5014 [inline] rt6_disable_ip+0x120/0x720 net/ipv6/route.c:5019 addrconf_ifdown+0x14d/0x1870 net/ipv6/addrconf.c:3853 addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1 notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9804 do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3158 rtnl_group_changelink net/core/rtnetlink.c:3790 [inline] __rtnl_newlink net/core/rtnetlink.c:3944 [inline] rtnl_newlink+0x14b0/0x1c90 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x820 net/socket.c:2592 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efc3638f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007efc37202038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007efc365e6270 RCX: 00007efc3638f749 RDX: 0000000000040014 RSI: 0000200000000140 RDI: 000000000000000b RBP: 00007efc36413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efc365e6308 R14: 00007efc365e6270 R15: 00007ffd5b23c008 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__fib6_drop_pcpu_from+0x1f0/0x3b0 net/ipv6/ip6_fib.c:993 Code: 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 ef e8 b7 10 19 f8 49 8b 6d 00 48 85 ed 74 2f 48 81 c5 90 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 ef e8 91 10 19 f8 48 8b 45 00 48 3b 44 RSP: 0018:ffffc900046ce190 EFLAGS: 00010207 RAX: 0000000000000024 RBX: ffffffff8d9aedd0 RCX: ffff88802e6a8000 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000124 R08: ffffffff8a0e05b6 R09: ffffffff8df41aa0 R10: dffffc0000000000 R11: fffffbfff1f0444f R12: 0000000000000000 R13: ffffe8ffffc38908 R14: dffffc0000000000 R15: ffff888057563d20 FS: 00007efc372026c0(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc96549ceb8 CR3: 0000000054be2000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 9: 74 08 je 0x13 b: 4c 89 ef mov %r13,%rdi e: e8 b7 10 19 f8 call 0xf81910ca 13: 49 8b 6d 00 mov 0x0(%r13),%rbp 17: 48 85 ed test %rbp,%rbp 1a: 74 2f je 0x4b 1c: 48 81 c5 90 00 00 00 add $0x90,%rbp 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 ef mov %rbp,%rdi 34: e8 91 10 19 f8 call 0xf81910ca 39: 48 8b 45 00 mov 0x0(%rbp),%rax 3d: 48 rex.W 3e: 3b .byte 0x3b 3f: 44 rex.R