BUG: unable to handle page fault for address: 0000000100000557
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0 
Oops: Oops: 0002 [#1] PREEMPT SMP PTI
CPU: 0 UID: 0 PID: 1579 Comm: syz-executor237 Not tainted 6.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:atmtcp_recv_control drivers/atm/atmtcp.c:93 [inline]
RIP: 0010:atmtcp_c_send+0xb2/0x330 drivers/atm/atmtcp.c:295
Code: 08 c1 0f 84 92 00 00 00 e8 0b 60 83 fe e9 2a 01 00 00 e8 01 60 83 fe e9 9e 01 00 00 4d 89 f5 4d 8b 74 24 0c 41 0f b7 44 24 1a <66> 41 89 86 58 05 00 00 41 8b 44 24 1c 41 89 86 5c 05 00 00 49 8d
RSP: 0018:ffffc90005f73b68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888178c50200 RCX: 0000000000000000
RDX: ffff888179238000 RSI: 00000000ffffffff RDI: 00000000ffffffff
RBP: 00000000ffffffff R08: ffff888179238000 R09: 0000000000000006
R10: 0000000000000005 R11: ffffffff82e1c8b0 R12: ffff88817739aa00
R13: ffff88817a9d9800 R14: 00000000ffffffff R15: 0000000000000000
FS:  00007f99ec93a6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000557 CR3: 000000017b280000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vcc_sendmsg+0x46b/0x570 net/atm/common.c:644
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0xc6/0xf0 net/socket.c:733
 ____sys_sendmsg+0x25f/0x350 net/socket.c:2573
 ___sys_sendmsg+0x2df/0x320 net/socket.c:2627
 __sys_sendmsg net/socket.c:2659 [inline]
 __do_sys_sendmsg net/socket.c:2664 [inline]
 __se_sys_sendmsg net/socket.c:2662 [inline]
 __x64_sys_sendmsg+0x111/0x1a0 net/socket.c:2662
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8f/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f99ec9a04a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f99ec93a198 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f99eca2a318 RCX: 00007f99ec9a04a9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000005
RBP: 00007f99eca2a310 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f99ec9f70ac
R13: 000000000000006e R14: 0000200000000200 R15: 0000200000000250
 </TASK>
Modules linked in:
CR2: 0000000100000557
---[ end trace 0000000000000000 ]---
RIP: 0010:atmtcp_recv_control drivers/atm/atmtcp.c:93 [inline]
RIP: 0010:atmtcp_c_send+0xb2/0x330 drivers/atm/atmtcp.c:295
Code: 08 c1 0f 84 92 00 00 00 e8 0b 60 83 fe e9 2a 01 00 00 e8 01 60 83 fe e9 9e 01 00 00 4d 89 f5 4d 8b 74 24 0c 41 0f b7 44 24 1a <66> 41 89 86 58 05 00 00 41 8b 44 24 1c 41 89 86 5c 05 00 00 49 8d
RSP: 0018:ffffc90005f73b68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888178c50200 RCX: 0000000000000000
RDX: ffff888179238000 RSI: 00000000ffffffff RDI: 00000000ffffffff
RBP: 00000000ffffffff R08: ffff888179238000 R09: 0000000000000006
R10: 0000000000000005 R11: ffffffff82e1c8b0 R12: ffff88817739aa00
R13: ffff88817a9d9800 R14: 00000000ffffffff R15: 0000000000000000
FS:  00007f99ec93a6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000557 CR3: 000000017b280000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	08 c1                	or     %al,%cl
   2:	0f 84 92 00 00 00    	je     0x9a
   8:	e8 0b 60 83 fe       	call   0xfe836018
   d:	e9 2a 01 00 00       	jmp    0x13c
  12:	e8 01 60 83 fe       	call   0xfe836018
  17:	e9 9e 01 00 00       	jmp    0x1ba
  1c:	4d 89 f5             	mov    %r14,%r13
  1f:	4d 8b 74 24 0c       	mov    0xc(%r12),%r14
  24:	41 0f b7 44 24 1a    	movzwl 0x1a(%r12),%eax
* 2a:	66 41 89 86 58 05 00 	mov    %ax,0x558(%r14) <-- trapping instruction
  31:	00
  32:	41 8b 44 24 1c       	mov    0x1c(%r12),%eax
  37:	41 89 86 5c 05 00 00 	mov    %eax,0x55c(%r14)
  3e:	49                   	rex.WB
  3f:	8d                   	.byte 0x8d