------------[ cut here ]------------
proc_dir_entry 'atm/atmtcp:0' already registered
WARNING: CPU: 0 PID: 8378 at fs/proc/generic.c:378 proc_register+0x432/0x500 fs/proc/generic.c:377
Modules linked in:
CPU: 0 UID: 0 PID: 8378 Comm: syz.2.665 Not tainted 6.16.0-rc2-syzkaller-00850-gab4eb6a25de2 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:proc_register+0x432/0x500 fs/proc/generic.c:377
Code: 3c 18 00 4c 8b 7c 24 08 4c 8b 2c 24 74 08 4c 89 ef e8 12 b5 c8 ff 49 8b 55 00 48 c7 c7 40 c5 9b 8b 4c 89 f6 e8 8f e1 28 ff 90 <0f> 0b 90 90 48 c7 c7 e0 7d 2c 8e e8 ce f0 0e 09 48 8b 44 24 28 0f
RSP: 0018:ffffc9001a827b18 EFLAGS: 00010246
RAX: ba111c17ef486600 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000c1f9000 RSI: 000000000000467d RDI: 000000000000467e
RBP: ffff888020af7d40 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa9ec R12: ffff88804ff9f594
R13: ffff88804ff9f5d8 R14: ffff888020af7c24 R15: ffff88804ff9f500
FS:  00007f99d904f6c0(0000) GS:ffff888125c49000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003480 CR3: 000000005051a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 atm_proc_dev_register+0xe7/0x180 net/atm/proc.c:361
 atm_dev_register+0x747/0x930 net/atm/resources.c:113
 atmtcp_create drivers/atm/atmtcp.c:371 [inline]
 atmtcp_attach drivers/atm/atmtcp.c:405 [inline]
 atmtcp_ioctl+0x4aa/0xdf0 drivers/atm/atmtcp.c:466
 do_vcc_ioctl+0x36a/0x9e0 net/atm/ioctl.c:159
 sock_do_ioctl+0xd9/0x300 net/socket.c:1238
 sock_ioctl+0x576/0x790 net/socket.c:1359
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 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: 0033:0x7f99d818e929
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:00007f99d904f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f99d83b5fa0 RCX: 00007f99d818e929
RDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000006
RBP: 00007f99d8210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f99d83b5fa0 R15: 00007ffdb895db78
 </TASK>