Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe03a: 0000 [#1] SMP KASAN PTI KASAN: probably user-memory-access in range [0x00000000ffff01d0-0x00000000ffff01d7] CPU: 1 UID: 0 PID: 12357 Comm: syz.5.2073 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:____ip_mc_inc_group+0x214/0xde0 net/ipv4/igmp.c:-1 Code: 4b 89 05 01 48 c7 c7 80 9c 9e 8c be ec 05 00 00 48 c7 c2 00 9d 9e 8c e8 6a 7a 99 f7 44 89 e8 4d 8d 34 c6 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 2e 09 1f f8 4d 8b 2e 4d 85 ed 0f 84 RSP: 0018:ffffc9000ef77830 EFLAGS: 00010206 RAX: 000000001fffe03a RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc9001d779000 RSI: 0000000000000085 RDI: 0000000000000086 RBP: 0000000000000001 R08: ffffffff8f537ba7 R09: 1ffffffff1ea6f74 R10: dffffc0000000000 R11: fffffbfff1ea6f75 R12: 00000000020000e0 R13: 000000000000003a R14: 00000000ffff01d0 R15: 0000000000000cc0 FS: 00007f2241c146c0(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6656991950 CR3: 000000002e920000 CR4: 00000000003526f0 Call Trace: __ip_mc_join_group+0x431/0x510 net/ipv4/igmp.c:2305 do_mcast_group_source+0x35d/0x460 net/ipv4/ip_sockglue.c:756 do_ip_setsockopt+0x1aa5/0x2d00 net/ipv4/ip_sockglue.c:1334 ip_setsockopt+0x66/0x110 net/ipv4/ip_sockglue.c:1417 do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2344 __sys_setsockopt net/socket.c:2369 [inline] __do_sys_setsockopt net/socket.c:2375 [inline] __se_sys_setsockopt net/socket.c:2372 [inline] __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2372 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: 0033:0x7f2240d8ebe9 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:00007f2241c14038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f2240fb5fa0 RCX: 00007f2240d8ebe9 RDX: 000000000000002e RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f2240e11e19 R08: 0000000000000108 R09: 0000000000000000 R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2240fb6038 R14: 00007f2240fb5fa0 R15: 00007ffd03997528 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:____ip_mc_inc_group+0x214/0xde0 net/ipv4/igmp.c:-1 Code: 4b 89 05 01 48 c7 c7 80 9c 9e 8c be ec 05 00 00 48 c7 c2 00 9d 9e 8c e8 6a 7a 99 f7 44 89 e8 4d 8d 34 c6 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 2e 09 1f f8 4d 8b 2e 4d 85 ed 0f 84 RSP: 0018:ffffc9000ef77830 EFLAGS: 00010206 RAX: 000000001fffe03a RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc9001d779000 RSI: 0000000000000085 RDI: 0000000000000086 RBP: 0000000000000001 R08: ffffffff8f537ba7 R09: 1ffffffff1ea6f74 R10: dffffc0000000000 R11: fffffbfff1ea6f75 R12: 00000000020000e0 R13: 000000000000003a R14: 00000000ffff01d0 R15: 0000000000000cc0 FS: 00007f2241c146c0(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f21c8bd3fb8 CR3: 000000002e920000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 4b 89 05 01 48 c7 c7 rex.WXB mov %rax,-0x3838b7ff(%rip) # 0xc7c74808 7: 80 9c 9e 8c be ec 05 sbbb $0x0,0x5ecbe8c(%rsi,%rbx,4) e: 00 f: 00 48 c7 add %cl,-0x39(%rax) 12: c2 00 9d ret $0x9d00 15: 9e sahf 16: 8c e8 mov %gs,%eax 18: 6a 7a push $0x7a 1a: 99 cltd 1b: f7 44 89 e8 4d 8d 34 testl $0xc6348d4d,-0x18(%rcx,%rcx,4) 22: c6 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 2e 09 1f f8 call 0xf81f0966 38: 4d 8b 2e mov (%r14),%r13 3b: 4d 85 ed test %r13,%r13 3e: 0f .byte 0xf 3f: 84 .byte 0x84