Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN PTI KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007] CPU: 1 UID: 0 PID: 16567 Comm: syz.3.2904 Not tainted 6.16.0-syzkaller-06574-gd9104cec3e8f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:ip6_mc_clear_src+0x18f/0x580 net/ipv6/mcast.c:2593 Code: ff ff ff e8 a3 ba 41 01 89 c5 31 ff 89 c6 e8 98 a3 91 f7 85 ed 74 45 e8 4f 9f 91 f7 eb 05 e8 48 9f 91 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 22 c2 f4 f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc9001aaa67f0 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 1ffff110091cb482 RCX: ffff888025b35a00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa07af7 R09: 1ffffffff1f40f5e R10: dffffc0000000000 R11: fffffbfff1f40f5f R12: 00000000ffff0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff888048e5a410 FS: 00007fccf02c26c0(0000) GS:ffff888125d80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555dee2808 CR3: 0000000048ac4000 CR4: 00000000003526f0 Call Trace: __ipv6_dev_mc_dec+0x2e4/0x330 net/ipv6/mcast.c:1009 ipv6_dev_mc_dec+0x30/0xc0 net/ipv6/mcast.c:1033 br_ip6_multicast_leave_snoopers net/bridge/br_multicast.c:4214 [inline] br_multicast_leave_snoopers+0x15a/0x1c0 net/bridge/br_multicast.c:4225 br_dev_stop+0x8a/0x180 net/bridge/br_device.c:197 __dev_close_many+0x361/0x6f0 net/core/dev.c:1755 __dev_close net/core/dev.c:1767 [inline] __dev_change_flags+0x2c7/0x6d0 net/core/dev.c:9538 netif_change_flags+0x88/0x1a0 net/core/dev.c:9603 do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3143 rtnl_changelink net/core/rtnetlink.c:3761 [inline] __rtnl_newlink net/core/rtnetlink.c:3920 [inline] rtnl_newlink+0x160b/0x1c70 net/core/rtnetlink.c:4057 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fccef38e9a9 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:00007fccf02c2038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fccef5b5fa0 RCX: 00007fccef38e9a9 RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000004 RBP: 00007fccef410d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fccef5b5fa0 R15: 00007ffc8bdfcc38 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip6_mc_clear_src+0x18f/0x580 net/ipv6/mcast.c:2593 Code: ff ff ff e8 a3 ba 41 01 89 c5 31 ff 89 c6 e8 98 a3 91 f7 85 ed 74 45 e8 4f 9f 91 f7 eb 05 e8 48 9f 91 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 22 c2 f4 f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc9001aaa67f0 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 1ffff110091cb482 RCX: ffff888025b35a00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa07af7 R09: 1ffffffff1f40f5e R10: dffffc0000000000 R11: fffffbfff1f40f5f R12: 00000000ffff0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff888048e5a410 FS: 00007fccf02c26c0(0000) GS:ffff888125d80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001640 CR3: 0000000048ac4000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 a3 ba 41 01 call 0x141baa8 5: 89 c5 mov %eax,%ebp 7: 31 ff xor %edi,%edi 9: 89 c6 mov %eax,%esi b: e8 98 a3 91 f7 call 0xf791a3a8 10: 85 ed test %ebp,%ebp 12: 74 45 je 0x59 14: e8 4f 9f 91 f7 call 0xf7919f68 19: eb 05 jmp 0x20 1b: e8 48 9f 91 f7 call 0xf7919f68 20: 4c 89 e0 mov %r12,%rax 23: 48 c1 e8 03 shr $0x3,%rax * 27: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2c: 74 08 je 0x36 2e: 4c 89 e7 mov %r12,%rdi 31: e8 22 c2 f4 f7 call 0xf7f4c258 36: 49 8b 2c 24 mov (%r12),%rbp 3a: 49 rex.WB 3b: 8d .byte 0x8d 3c: 7c .byte 0x7c