Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe1ac: 0000 [#1] SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x00000000ffff0d60-0x00000000ffff0d67] CPU: 1 UID: 0 PID: 12451 Comm: syz-executor Not tainted 6.16.0-syzkaller-11489-gd2eedaa3909b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:____ip_mc_inc_group+0x128/0x10f0 net/ipv4/igmp.c:1516 Code: 6e ca a7 f7 8b 44 24 08 85 c0 0f 85 cd 01 00 00 e8 1d cf a7 f7 4a 8d 1c eb 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 3b 0e 00 00 48 8b 1b 48 85 db 0f 84 38 02 00 00 RSP: 0018:ffffc9001ccaef38 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 00000000ffff0d60 RCX: ffffffff8a13c532 RDX: 000000001fffe1ac RSI: ffffffff8a13c353 RDI: 0000000000000001 RBP: ffff888068ca0400 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 00000000010000e0 R13: 00000000000001ac R14: 1ffff92003995deb R15: ffff88802a4a6418 FS: 000055555ef02500(0000) GS:ffff8881247c6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc766ff4fe0 CR3: 00000000644dc000 CR4: 00000000003526f0 Call Trace: __ip_mc_inc_group net/ipv4/igmp.c:1573 [inline] ip_mc_inc_group net/ipv4/igmp.c:1579 [inline] ip_mc_up+0x154/0x3b0 net/ipv4/igmp.c:1880 inetdev_event+0xafb/0x18a0 net/ipv4/devinet.c:1631 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9579 netif_change_flags+0x108/0x160 net/core/dev.c:9608 do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3143 rtnl_changelink net/core/rtnetlink.c:3761 [inline] __rtnl_newlink net/core/rtnetlink.c:3920 [inline] rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4057 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5a7/0x870 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] __sys_sendto+0x4a0/0x520 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2231 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2b657909fc Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b RSP: 002b:00007ffe442825f0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f2b664e4620 RCX: 00007f2b657909fc RDX: 000000000000002c RSI: 00007f2b664e4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffe44282644 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f2b664e4670 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:____ip_mc_inc_group+0x128/0x10f0 net/ipv4/igmp.c:1516 Code: 6e ca a7 f7 8b 44 24 08 85 c0 0f 85 cd 01 00 00 e8 1d cf a7 f7 4a 8d 1c eb 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 3b 0e 00 00 48 8b 1b 48 85 db 0f 84 38 02 00 00 RSP: 0018:ffffc9001ccaef38 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 00000000ffff0d60 RCX: ffffffff8a13c532 RDX: 000000001fffe1ac RSI: ffffffff8a13c353 RDI: 0000000000000001 RBP: ffff888068ca0400 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 00000000010000e0 R13: 00000000000001ac R14: 1ffff92003995deb R15: ffff88802a4a6418 FS: 000055555ef02500(0000) GS:ffff8881247c6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0ef6592f98 CR3: 00000000644dc000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 6e outsb %ds:(%rsi),(%dx) 1: ca a7 f7 lret $0xf7a7 4: 8b 44 24 08 mov 0x8(%rsp),%eax 8: 85 c0 test %eax,%eax a: 0f 85 cd 01 00 00 jne 0x1dd 10: e8 1d cf a7 f7 call 0xf7a7cf32 15: 4a 8d 1c eb lea (%rbx,%r13,8),%rbx 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 da mov %rbx,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 3b 0e 00 00 jne 0xe6f 34: 48 8b 1b mov (%rbx),%rbx 37: 48 85 db test %rbx,%rbx 3a: 0f 84 38 02 00 00 je 0x278