Oops: general protection fault, probably for non-canonical address 0xdffffc0000008034: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x00000000000401a0-0x00000000000401a7]
CPU: 1 UID: 0 PID: 6129 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:sigd_send+0x48d/0xf90 net/atm/signaling.c:78
Code: 8d 67 14 4c 89 e0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 91 07 00 00 31 ed 41 2b 2c 24 49 8d be 9c 01 00 00 48 89 f8 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 8f 07 00 00 41 89 ae 9c 01 00 00 49 8d be
RSP: 0018:ffffc90003737820 EFLAGS: 00010202
RAX: 0000000000008034 RBX: dffffc0000000000 RCX: 0000000000000005
RDX: ffffffff8a75f9af RSI: ffffffff8f4cf240 RDI: 00000000000401a0
RBP: 0000000000000000 R08: ffff88802cf50000 R09: 0000000000000007
R10: 000000000000000f R11: 0000000000000000 R12: ffff888058c8ea54
R13: 1ffff1100b191d48 R14: 0000000000040004 R15: ffff888058c8ea40
FS: 00007f9e83ba46c0(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f91aa192e9c CR3: 000000003195e000 CR4: 00000000003526f0
Call Trace:
<TASK>
vcc_sendmsg+0xb2e/0xd70 net/atm/common.c:650
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:742
____sys_sendmsg+0x505/0x830 net/socket.c:2630
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684
__sys_sendmsg net/socket.c:2716 [inline]
__do_sys_sendmsg net/socket.c:2721 [inline]
__se_sys_sendmsg net/socket.c:2719 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9e82d8efc9
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:00007f9e83ba4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f9e82fe5fa0 RCX: 00007f9e82d8efc9
RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000004
RBP: 00007f9e82e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9e82fe6038 R14: 00007f9e82fe5fa0 R15: 00007fffa761f4e8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sigd_send+0x48d/0xf90 net/atm/signaling.c:78
Code: 8d 67 14 4c 89 e0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 91 07 00 00 31 ed 41 2b 2c 24 49 8d be 9c 01 00 00 48 89 f8 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 8f 07 00 00 41 89 ae 9c 01 00 00 49 8d be
RSP: 0018:ffffc90003737820 EFLAGS: 00010202
RAX: 0000000000008034 RBX: dffffc0000000000 RCX: 0000000000000005
RDX: ffffffff8a75f9af RSI: ffffffff8f4cf240 RDI: 00000000000401a0
RBP: 0000000000000000 R08: ffff88802cf50000 R09: 0000000000000007
R10: 000000000000000f R11: 0000000000000000 R12: ffff888058c8ea54
R13: 1ffff1100b191d48 R14: 0000000000040004 R15: ffff888058c8ea40
FS: 00007f9e83ba46c0(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f91aa192e9c CR3: 000000003195e000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 8d 67 14 lea 0x14(%rdi),%esp
3: 4c 89 e0 mov %r12,%rax
6: 48 c1 e8 03 shr $0x3,%rax
a: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax
e: 84 c0 test %al,%al
10: 0f 85 91 07 00 00 jne 0x7a7
16: 31 ed xor %ebp,%ebp
18: 41 2b 2c 24 sub (%r12),%ebp
1c: 49 8d be 9c 01 00 00 lea 0x19c(%r14),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 8f 07 00 00 jne 0x7c5
36: 41 89 ae 9c 01 00 00 mov %ebp,0x19c(%r14)
3d: 49 rex.WB
3e: 8d .byte 0x8d
3f: be .byte 0xbe