general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] CPU: 0 PID: 13370 Comm: syz-executor.3 Not tainted 6.1.0-rc4-syzkaller-01033-gb548b17a93fd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:udpv6_sendmsg+0xe7a/0x2c70 net/ipv6/udp.c:1433 Code: ff ff ff 48 83 c0 08 48 89 85 68 fd ff ff 48 8b 85 c0 fd ff ff 48 8d 78 4e 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 d0 1b 00 00 RSP: 0018:ffffc90014ff7208 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 000000000000001c RCX: ffffc9000c06b000 RDX: 0000000000000009 RSI: ffffffff88225844 RDI: 000000000000004e RBP: ffffc90014ff74a8 R08: 0000000000000003 R09: 0000000000000000 R10: 000000000000204e R11: 0000000000000000 R12: ffff888045809d00 R13: 000000000000204e R14: ffff888045809d12 R15: ffffc90014ff7538 FS: 00007ff244df5700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001f85 CR3: 000000007c785000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_udp_sendmsg net/rxrpc/output.c:27 [inline] do_udp_sendmsg net/rxrpc/output.c:21 [inline] rxrpc_send_data_packet+0x1e02/0x24b0 net/rxrpc/output.c:485 rxrpc_queue_packet net/rxrpc/sendmsg.c:264 [inline] rxrpc_send_data+0xc10/0x2870 net/rxrpc/sendmsg.c:411 rxrpc_do_sendmsg+0xb2f/0x1200 net/rxrpc/sendmsg.c:733 rxrpc_sendmsg+0x1c4/0x650 net/rxrpc/af_rxrpc.c:561 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x8c0 net/socket.c:2476 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530 __sys_sendmmsg+0x18b/0x460 net/socket.c:2616 __do_sys_sendmmsg net/socket.c:2645 [inline] __se_sys_sendmmsg net/socket.c:2642 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2642 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff24408b639 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff244df5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007ff2441abf80 RCX: 00007ff24408b639 RDX: 0000000000000001 RSI: 0000000020005c00 RDI: 0000000000000003 RBP: 00007ff2440e67e1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffe507a55f R14: 00007ff244df5300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess), 2 bytes skipped: 0: ff 48 83 decl -0x7d(%rax) 3: c0 08 48 rorb $0x48,(%rax) 6: 89 85 68 fd ff ff mov %eax,-0x298(%rbp) c: 48 8b 85 c0 fd ff ff mov -0x240(%rbp),%rax 13: 48 8d 78 4e lea 0x4e(%rax),%rdi 17: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1e: fc ff df 21: 48 89 fa mov %rdi,%rdx 24: 48 c1 ea 03 shr $0x3,%rdx * 28: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2c: 48 89 fa mov %rdi,%rdx 2f: 83 e2 07 and $0x7,%edx 32: 38 d0 cmp %dl,%al 34: 7f 08 jg 0x3e 36: 84 c0 test %al,%al 38: 0f 85 d0 1b 00 00 jne 0x1c0e