==================================================================
BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff8605c618 of 4 bytes by task 12922 on cpu 0:
 free_pid+0x80/0x170 kernel/pid.c:143
 copy_process+0x19c5/0x1f80 kernel/fork.c:2636
 kernel_clone+0x16a/0x570 kernel/fork.c:2796
 __do_sys_clone3 kernel/fork.c:3097 [inline]
 __se_sys_clone3+0x1b5/0x1f0 kernel/fork.c:3081
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3081
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

read to 0xffffffff8605c618 of 4 bytes by task 1885 on cpu 1:
 copy_process+0x15d8/0x1f80 kernel/fork.c:2542
 kernel_clone+0x16a/0x570 kernel/fork.c:2796
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2874
 call_usermodehelper_exec_sync kernel/umh.c:133 [inline]
 call_usermodehelper_exec_work+0x7a/0x150 kernel/umh.c:164
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335
 worker_thread+0x526/0x730 kernel/workqueue.c:3416
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243

value changed: 0x8000022e -> 0x8000022d

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1885 Comm: kworker/u8:6 Tainted: G        W          6.9.0-rc2-syzkaller-00040-gb1e6ec0a0fd0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events_unbound call_usermodehelper_exec_work
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netdevsim netdevsim3 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim3 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim3 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim3 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
bridge_slave_1: left allmulticast mode
bridge_slave_1: left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
bridge_slave_0: left allmulticast mode
bridge_slave_0: left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): Released all slaves
hsr_slave_0: left promiscuous mode
hsr_slave_1: left promiscuous mode
batman_adv: batadv0: Interface deactivated: batadv_slave_0
batman_adv: batadv0: Removing interface: batadv_slave_0
batman_adv: batadv0: Interface deactivated: batadv_slave_1
batman_adv: batadv0: Removing interface: batadv_slave_1
veth1_macvtap: left promiscuous mode
veth0_macvtap: left promiscuous mode
veth1_vlan: left promiscuous mode
veth0_vlan: left promiscuous mode