------------[ cut here ]------------
proc_dir_entry 'atm/atmtcp:0' already registered
WARNING: CPU: 1 PID: 9668 at fs/proc/generic.c:378 proc_register+0x3d8/0x48c fs/proc/generic.c:379
Modules linked in:
CPU: 1 UID: 0 PID: 9668 Comm: syz.4.577 Not tainted 6.16.0-rc2-syzkaller-g9aa9b43d689e #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : proc_register+0x3d8/0x48c fs/proc/generic.c:379
lr : proc_register+0x3d0/0x48c fs/proc/generic.c:377
sp : ffff80009c197890
x29: ffff80009c1978c0 x28: dfff800000000000 x27: 0000000000000000
x26: 0000000000000008 x25: ffff0000f0e535e4 x24: ffff0000c29b0988
x23: ffff0000f0e535d8 x22: 1fffe0001e1ca6b2 x21: ffff0000f0e53594
x20: ffff0000c29b0864 x19: ffff0000f0e53500 x18: 00000000ffffffff
x17: 0000000000000000 x16: ffff80008ae33808 x15: ffff700011ed61d4
x14: 1ffff00011ed61d4 x13: 0000000000000004 x12: ffffffffffffffff
x11: 0000000000080000 x10: 0000000000001819 x9 : 648f648d0a8b0000
x8 : 648f648d0a8b0000 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80009c1971d8 x4 : ffff80008f727060 x3 : ffff80008054c348
x2 : 0000000000000000 x1 : 0000000000000001 x0 : ffff80008f99ba40
Call trace:
 proc_register+0x3d8/0x48c fs/proc/generic.c:379 (P)
 proc_create_data+0x1f4/0x29c fs/proc/generic.c:585
 atm_proc_dev_register+0xe0/0x17c net/atm/proc.c:361
 atm_dev_register+0x6dc/0x8e0 net/atm/resources.c:113
 atmtcp_create drivers/atm/atmtcp.c:369 [inline]
 atmtcp_attach drivers/atm/atmtcp.c:403 [inline]
 atmtcp_ioctl+0x44c/0xd48 drivers/atm/atmtcp.c:464
 do_vcc_ioctl+0x308/0xdf0 net/atm/ioctl.c:159
 vcc_ioctl+0x38/0x4c net/atm/ioctl.c:220
 sock_do_ioctl+0xf4/0x2b4 net/socket.c:1190
 sock_ioctl+0x57c/0x84c net/socket.c:1311
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:893
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
irq event stamp: 324
hardirqs last  enabled at (323): [<ffff800080553834>] __up_console_sem kernel/printk/printk.c:344 [inline]
hardirqs last  enabled at (323): [<ffff800080553834>] __console_unlock+0x70/0xc4 kernel/printk/printk.c:2885
hardirqs last disabled at (324): [<ffff80008aec67ac>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:511
softirqs last  enabled at (288): [<ffff8000801fcf10>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (286): [<ffff8000801fcedc>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
atm:atm_dev_register: atm_proc_dev_register failed for dev atmtcp