Extracting prog: 51.730278223s
Minimizing prog: 16m12.488862618s
Simplifying prog options: 0s
Extracting C: 29.785936591s
Simplifying C: 12m5.397515399s


extracting reproducer from 30 programs
first checking the prog from the crash report
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
detailed listing:
executing program 0:
socket$inet_icmp_raw(0x2, 0x3, 0x1)
syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5)
close(0x4)
syz_open_procfs$namespace(0x0, &(0x7f0000000200)='ns/pid_for_children\x00')
unshare(0x6a040000)
r0 = socket(0x8, 0x3, 0x0)
ioctl$sock_netrom_SIOCADDRT(r0, 0x6180, 0x0)
syz_genetlink_get_family_id$batadv(0x0, 0xffffffffffffffff)
close(0x4)

program crashed: WARNING: proc registration bug in atm_dev_register
single: successfully extracted reproducer
found reproducer with 9 syscalls
minimizing guilty program
testing program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv
detailed listing:
executing program 0:
socket$inet_icmp_raw(0x2, 0x3, 0x1)
syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5)
close(0x4)
syz_open_procfs$namespace(0x0, &(0x7f0000000200)='ns/pid_for_children\x00')
unshare(0x6a040000)
r0 = socket(0x8, 0x3, 0x0)
ioctl$sock_netrom_SIOCADDRT(r0, 0x6180, 0x0)
syz_genetlink_get_family_id$batadv(0x0, 0xffffffffffffffff)

program did not crash
testing program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-close
detailed listing:
executing program 0:
socket$inet_icmp_raw(0x2, 0x3, 0x1)
syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5)
close(0x4)
syz_open_procfs$namespace(0x0, &(0x7f0000000200)='ns/pid_for_children\x00')
unshare(0x6a040000)
r0 = socket(0x8, 0x3, 0x0)
ioctl$sock_netrom_SIOCADDRT(r0, 0x6180, 0x0)
close(0x4)

program did not crash
testing program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-syz_genetlink_get_family_id$batadv-close
detailed listing:
executing program 0:
socket$inet_icmp_raw(0x2, 0x3, 0x1)
syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5)
close(0x4)
syz_open_procfs$namespace(0x0, &(0x7f0000000200)='ns/pid_for_children\x00')
unshare(0x6a040000)
socket(0x8, 0x3, 0x0)
syz_genetlink_get_family_id$batadv(0x0, 0xffffffffffffffff)
close(0x4)

program did not crash
testing program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
detailed listing:
executing program 0:
socket$inet_icmp_raw(0x2, 0x3, 0x1)
syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5)
close(0x4)
syz_open_procfs$namespace(0x0, &(0x7f0000000200)='ns/pid_for_children\x00')
unshare(0x6a040000)
ioctl$sock_netrom_SIOCADDRT(0xffffffffffffffff, 0x6180, 0x0)
syz_genetlink_get_family_id$batadv(0x0, 0xffffffffffffffff)
close(0x4)

program did not crash
testing program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
detailed listing:
executing program 0:
socket$inet_icmp_raw(0x2, 0x3, 0x1)
syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5)
close(0x4)
syz_open_procfs$namespace(0x0, &(0x7f0000000200)='ns/pid_for_children\x00')
r0 = socket(0x8, 0x3, 0x0)
ioctl$sock_netrom_SIOCADDRT(r0, 0x6180, 0x0)
syz_genetlink_get_family_id$batadv(0x0, 0xffffffffffffffff)
close(0x4)

program did not crash
testing program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
detailed listing:
executing program 0:
socket$inet_icmp_raw(0x2, 0x3, 0x1)
syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5)
close(0x4)
unshare(0x6a040000)
r0 = socket(0x8, 0x3, 0x0)
ioctl$sock_netrom_SIOCADDRT(r0, 0x6180, 0x0)
syz_genetlink_get_family_id$batadv(0x0, 0xffffffffffffffff)
close(0x4)

program did not crash
testing program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
detailed listing:
executing program 0:
socket$inet_icmp_raw(0x2, 0x3, 0x1)
syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5)
syz_open_procfs$namespace(0x0, &(0x7f0000000200)='ns/pid_for_children\x00')
unshare(0x6a040000)
r0 = socket(0x8, 0x3, 0x0)
ioctl$sock_netrom_SIOCADDRT(r0, 0x6180, 0x0)
syz_genetlink_get_family_id$batadv(0x0, 0xffffffffffffffff)
close(0x4)

program did not crash
testing program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
detailed listing:
executing program 0:
socket$inet_icmp_raw(0x2, 0x3, 0x1)
close(0x4)
syz_open_procfs$namespace(0x0, &(0x7f0000000200)='ns/pid_for_children\x00')
unshare(0x6a040000)
r0 = socket(0x8, 0x3, 0x0)
ioctl$sock_netrom_SIOCADDRT(r0, 0x6180, 0x0)
syz_genetlink_get_family_id$batadv(0x0, 0xffffffffffffffff)
close(0x4)

program did not crash
testing program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
detailed listing:
executing program 0:
syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5)
close(0x4)
syz_open_procfs$namespace(0x0, &(0x7f0000000200)='ns/pid_for_children\x00')
unshare(0x6a040000)
r0 = socket(0x8, 0x3, 0x0)
ioctl$sock_netrom_SIOCADDRT(r0, 0x6180, 0x0)
syz_genetlink_get_family_id$batadv(0x0, 0xffffffffffffffff)
close(0x4)

program did not crash
testing program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
detailed listing:
executing program 0:
socket$inet_icmp_raw(0x2, 0x3, 0x1)
syz_init_net_socket$bt_hci(0x1f, 0x3, 0x5)
close(0x4)
syz_open_procfs$namespace(0x0, 0x0)
unshare(0x6a040000)
r0 = socket(0x8, 0x3, 0x0)
ioctl$sock_netrom_SIOCADDRT(r0, 0x6180, 0x0)
syz_genetlink_get_family_id$batadv(0x0, 0xffffffffffffffff)
close(0x4)

program did not crash
extracting C reproducer
testing compiled C program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
program crashed: WARNING: proc registration bug in atm_dev_register
simplifying C reproducer
testing compiled C program (duration=46.241837788s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
program did not crash
testing compiled C program (duration=46.241837788s, {Threaded:true Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
program did not crash
testing compiled C program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
program did not crash
testing compiled C program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
program crashed: WARNING: proc registration bug in atm_dev_register
testing compiled C program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
program crashed: WARNING: proc registration bug in atm_dev_register
testing compiled C program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
program crashed: WARNING: proc registration bug in atm_dev_register
testing compiled C program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
program crashed: WARNING: proc registration bug in atm_dev_register
testing compiled C program (duration=46.241837788s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_icmp_raw-syz_init_net_socket$bt_hci-close-syz_open_procfs$namespace-unshare-socket-ioctl$sock_netrom_SIOCADDRT-syz_genetlink_get_family_id$batadv-close
program crashed: WARNING: proc registration bug in atm_dev_register
reproducing took 29m39.402609729s
repro crashed as (corrupted=false):
------------[ cut here ]------------
proc_dir_entry 'atm/atmtcp:0' already registered
WARNING: CPU: 0 PID: 6414 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377
Modules linked in:
CPU: 0 UID: 0 PID: 6414 Comm: syz-executor384 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377
Code: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8 00 00 00 e8 0c 02 1c ff 90 <0f> 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48
RSP: 0018:ffffc90004cd7a30 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae248
RDX: ffff888077ac4880 RSI: ffffffff817ae255 RDI: 0000000000000001
RBP: ffff88801b91e348 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888071f3c140
R13: dffffc0000000000 R14: ffff888071ee8200 R15: ffffed100e3e7844
FS:  00007f94d2a156c0(0000) GS:ffff888124753000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f94d29d3d58 CR3: 00000000744be000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 proc_create_data+0xbe/0x110 fs/proc/generic.c:585
 atm_proc_dev_register+0x112/0x1e0 net/atm/proc.c:361
 atm_dev_register+0x46d/0x890 net/atm/resources.c:113
 atmtcp_create+0x77/0x210 drivers/atm/atmtcp.c:369
 atmtcp_attach drivers/atm/atmtcp.c:403 [inline]
 atmtcp_ioctl+0x2f9/0xd60 drivers/atm/atmtcp.c:464
 do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159
 sock_do_ioctl+0x115/0x280 net/socket.c:1190
 sock_ioctl+0x227/0x6b0 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]
 __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94d2a5d279
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 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:00007f94d2a15198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f94d2ae6328 RCX: 00007f94d2a5d279
RDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000005
RBP: 00007f94d2ae6320 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f94d2ab30ac
R13: 00007f94d2a151a0 R14: 0000200000000200 R15: 00007f94d2ab303b
 </TASK>

final repro crashed as (corrupted=false):
------------[ cut here ]------------
proc_dir_entry 'atm/atmtcp:0' already registered
WARNING: CPU: 0 PID: 6414 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377
Modules linked in:
CPU: 0 UID: 0 PID: 6414 Comm: syz-executor384 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377
Code: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8 00 00 00 e8 0c 02 1c ff 90 <0f> 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48
RSP: 0018:ffffc90004cd7a30 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae248
RDX: ffff888077ac4880 RSI: ffffffff817ae255 RDI: 0000000000000001
RBP: ffff88801b91e348 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888071f3c140
R13: dffffc0000000000 R14: ffff888071ee8200 R15: ffffed100e3e7844
FS:  00007f94d2a156c0(0000) GS:ffff888124753000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f94d29d3d58 CR3: 00000000744be000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 proc_create_data+0xbe/0x110 fs/proc/generic.c:585
 atm_proc_dev_register+0x112/0x1e0 net/atm/proc.c:361
 atm_dev_register+0x46d/0x890 net/atm/resources.c:113
 atmtcp_create+0x77/0x210 drivers/atm/atmtcp.c:369
 atmtcp_attach drivers/atm/atmtcp.c:403 [inline]
 atmtcp_ioctl+0x2f9/0xd60 drivers/atm/atmtcp.c:464
 do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159
 sock_do_ioctl+0x115/0x280 net/socket.c:1190
 sock_ioctl+0x227/0x6b0 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]
 __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94d2a5d279
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 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:00007f94d2a15198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f94d2ae6328 RCX: 00007f94d2a5d279
RDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000005
RBP: 00007f94d2ae6320 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f94d2ab30ac
R13: 00007f94d2a151a0 R14: 0000200000000200 R15: 00007f94d2ab303b
 </TASK>