Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe1ac: 0000 [#1] SMP KASAN PTI KASAN: probably user-memory-access in range [0x00000000ffff0d60-0x00000000ffff0d67] CPU: 0 UID: 0 PID: 21688 Comm: syz.3.4275 Not tainted 6.16.0-syzkaller-12063-g37816488247d #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:ip_mc_hash_remove net/ipv4/igmp.c:1431 [inline] RIP: 0010:__ip_mc_dec_group+0x2fd/0x690 net/ipv4/igmp.c:1774 Code: f9 13 bc f7 c6 05 98 8b 89 05 01 48 c7 c7 00 90 9e 8c be 97 05 00 00 48 c7 c2 80 90 9e 8c e8 2a ee 99 f7 4c 89 e3 48 c1 eb 03 <42> 80 3c 2b 00 74 08 4c 89 e7 e8 64 7e 1f f8 4d 8b 2c 24 4d 39 f5 RSP: 0018:ffffc9000dc7e8b8 EFLAGS: 00010206 RAX: ffffffff8a03977e RBX: 000000001fffe1ac RCX: 0000000000080000 RDX: ffffc9001834f000 RSI: 0000000000000d20 RDI: 0000000000000d21 RBP: ffff88805729f020 R08: ffffffff8f534927 R09: 1ffffffff1ea6924 R10: dffffc0000000000 R11: fffffbfff1ea6925 R12: 00000000ffff0d60 R13: dffffc0000000000 R14: ffff888032035a00 R15: 1ffff1100ae53e04 FS: 00007faf50b4f6c0(0000) GS:ffff888125c21000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000013c0 CR3: 00000000303fe000 CR4: 00000000003526f0 Call Trace: ip_mc_destroy_dev+0x59/0x370 net/ipv4/igmp.c:1901 inetdev_destroy net/ipv4/devinet.c:325 [inline] inetdev_event+0x570/0x15b0 net/ipv4/devinet.c:1656 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_mtu net/core/dev.c:2304 [inline] netif_set_mtu_ext+0x594/0x7d0 net/core/dev.c:9669 do_setlink+0x91a/0x41c0 net/core/rtnetlink.c:3106 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+0x208/0x470 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+0x21c/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: 0033:0x7faf4fd8ebe9 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:00007faf50b4f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007faf4ffb5fa0 RCX: 00007faf4fd8ebe9 RDX: 0000000000000000 RSI: 0000200000000380 RDI: 0000000000000009 RBP: 00007faf4fe11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007faf4ffb6038 R14: 00007faf4ffb5fa0 R15: 00007ffee209cee8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip_mc_hash_remove net/ipv4/igmp.c:1431 [inline] RIP: 0010:__ip_mc_dec_group+0x2fd/0x690 net/ipv4/igmp.c:1774 Code: f9 13 bc f7 c6 05 98 8b 89 05 01 48 c7 c7 00 90 9e 8c be 97 05 00 00 48 c7 c2 80 90 9e 8c e8 2a ee 99 f7 4c 89 e3 48 c1 eb 03 <42> 80 3c 2b 00 74 08 4c 89 e7 e8 64 7e 1f f8 4d 8b 2c 24 4d 39 f5 RSP: 0018:ffffc9000dc7e8b8 EFLAGS: 00010206 RAX: ffffffff8a03977e RBX: 000000001fffe1ac RCX: 0000000000080000 RDX: ffffc9001834f000 RSI: 0000000000000d20 RDI: 0000000000000d21 RBP: ffff88805729f020 R08: ffffffff8f534927 R09: 1ffffffff1ea6924 R10: dffffc0000000000 R11: fffffbfff1ea6925 R12: 00000000ffff0d60 R13: dffffc0000000000 R14: ffff888032035a00 R15: 1ffff1100ae53e04 FS: 00007faf50b4f6c0(0000) GS:ffff888125d21000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c275f53 CR3: 00000000303fe000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: f9 stc 1: 13 bc f7 c6 05 98 8b adc -0x7467fa3a(%rdi,%rsi,8),%edi 8: 89 05 01 48 c7 c7 mov %eax,-0x3838b7ff(%rip) # 0xc7c7480f e: 00 90 9e 8c be 97 add %dl,-0x68417362(%rax) 14: 05 00 00 48 c7 add $0xc7480000,%eax 19: c2 80 90 ret $0x9080 1c: 9e sahf 1d: 8c e8 mov %gs,%eax 1f: 2a ee sub %dh,%ch 21: 99 cltd 22: f7 4c 89 e3 48 c1 eb testl $0x3ebc148,-0x1d(%rcx,%rcx,4) 29: 03 * 2a: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 e7 mov %r12,%rdi 34: e8 64 7e 1f f8 call 0xf81f7e9d 39: 4d 8b 2c 24 mov (%r12),%r13 3d: 4d 39 f5 cmp %r14,%r13