general protection fault, probably for non-canonical address 0xdffffc000000001a: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000d0-0x00000000000000d7] CPU: 0 PID: 9028 Comm: syz.4.1026 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:ax25_send_control+0x78/0x4e0 net/ax25/ax25_subr.c:152 Code: 48 83 c3 08 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 88 67 ea f8 41 bf d6 00 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 03 03 00 00 41 0f b7 3f 83 c7 02 be 20 RSP: 0018:ffffc9000320f9f0 EFLAGS: 00010203 RAX: 000000000000001a RBX: ffff888026b2d008 RCX: 0000000000080000 RDX: ffffc90004004000 RSI: 000000000000389e RDI: 000000000000389f RBP: 000000000000002f R08: ffff888017abbb80 R09: 0000000000000003 R10: 0000000000000002 R11: 0000000000000002 R12: ffff88805b31e828 R13: 1ffff1100b663d05 R14: dffffc0000000000 R15: 00000000000000d6 FS: 00007faad38f16c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b34f17ff8 CR3: 0000000048596000 CR4: 00000000003506f0 Call Trace: ax25_std_establish_data_link+0x97/0x110 net/ax25/ax25_std_subr.c:-1 ax25_send_frame+0x313/0x490 net/ax25/ax25_out.c:78 rose_send_frame+0x111/0x220 net/rose/rose_link.c:106 rose_transmit_restart_request net/rose/rose_link.c:198 [inline] rose_transmit_link+0x463/0x730 net/rose/rose_link.c:284 rose_write_internal+0x680/0x1e90 net/rose/rose_subr.c:198 rose_connect+0xada/0x13b0 net/rose/af_rose.c:875 __sys_connect_file net/socket.c:1932 [inline] __sys_connect+0x3cb/0x450 net/socket.c:1949 __do_sys_connect net/socket.c:1959 [inline] __se_sys_connect net/socket.c:1956 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:1956 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7faad5697629 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007faad38f1028 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007faad5910fa0 RCX: 00007faad5697629 RDX: 000000000000001c RSI: 0000200000000240 RDI: 0000000000000009 RBP: 00007faad572db39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007faad5911038 R14: 00007faad5910fa0 R15: 00007ffee3246448 Modules linked in: ---[ end trace 3de9a202cad3efec ]--- RIP: 0010:ax25_send_control+0x78/0x4e0 net/ax25/ax25_subr.c:152 Code: 48 83 c3 08 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 88 67 ea f8 41 bf d6 00 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 03 03 00 00 41 0f b7 3f 83 c7 02 be 20 RSP: 0018:ffffc9000320f9f0 EFLAGS: 00010203 RAX: 000000000000001a RBX: ffff888026b2d008 RCX: 0000000000080000 RDX: ffffc90004004000 RSI: 000000000000389e RDI: 000000000000389f RBP: 000000000000002f R08: ffff888017abbb80 R09: 0000000000000003 R10: 0000000000000002 R11: 0000000000000002 R12: ffff88805b31e828 R13: 1ffff1100b663d05 R14: dffffc0000000000 R15: 00000000000000d6 FS: 00007faad38f16c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4f945f72f8 CR3: 0000000048596000 CR4: 00000000003506f0 ---------------- Code disassembly (best guess): 0: 48 83 c3 08 add $0x8,%rbx 4: 48 89 d8 mov %rbx,%rax 7: 48 c1 e8 03 shr $0x3,%rax b: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 10: 74 08 je 0x1a 12: 48 89 df mov %rbx,%rdi 15: e8 88 67 ea f8 call 0xf8ea67a2 1a: 41 bf d6 00 00 00 mov $0xd6,%r15d 20: 4c 03 3b add (%rbx),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 03 03 00 00 jne 0x33a 37: 41 0f b7 3f movzwl (%r15),%edi 3b: 83 c7 02 add $0x2,%edi 3e: be .byte 0xbe 3f: 20 .byte 0x20