================================================================== BUG: KCSAN: data-race in alloc_pid / copy_process write to 0xffffffff85a77590 of 4 bytes by task 25372 on cpu 0: alloc_pid+0x392/0x5c0 kernel/pid.c:227 copy_process+0x216a/0x3b50 kernel/fork.c:2029 _do_fork+0xfe/0x6e0 kernel/fork.c:2366 __do_sys_clone kernel/fork.c:2521 [inline] __se_sys_clone kernel/fork.c:2502 [inline] __x64_sys_clone+0x12b/0x160 kernel/fork.c:2502 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffffffff85a77590 of 4 bytes by task 8175 on cpu 1: copy_process+0x2844/0x3b50 kernel/fork.c:2163 _do_fork+0xfe/0x6e0 kernel/fork.c:2366 kernel_thread+0xa4/0xd0 kernel/fork.c:2453 call_usermodehelper_exec_sync kernel/umh.c:135 [inline] call_usermodehelper_exec_work+0x75/0x190 kernel/umh.c:187 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8175 Comm: kworker/u4:7 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound call_usermodehelper_exec_work ==================================================================