================================================================== BUG: KCSAN: data-race in alloc_empty_file / percpu_counter_add_batch write to 0xffffffff85c08548 of 8 bytes by task 12268 on cpu 1: percpu_counter_add_batch+0xca/0x150 lib/percpu_counter.c:91 percpu_counter_add include/linux/percpu_counter.h:55 [inline] percpu_counter_dec include/linux/percpu_counter.h:184 [inline] file_free fs/file_table.c:57 [inline] __fput+0x35d/0x520 fs/file_table.c:298 ____fput+0x1f/0x30 fs/file_table.c:313 task_work_run+0xf6/0x130 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffffffff85c08548 of 8 bytes by task 8644 on cpu 0: get_nr_files fs/file_table.c:66 [inline] alloc_empty_file+0x2d/0x180 fs/file_table.c:142 alloc_file+0x4e/0x2b0 fs/file_table.c:193 alloc_file_pseudo+0x11c/0x1b0 fs/file_table.c:232 sock_alloc_file+0x69/0x130 net/socket.c:398 sock_map_fd net/socket.c:422 [inline] __sys_socket+0xe8/0x170 net/socket.c:1517 __do_sys_socket net/socket.c:1522 [inline] __se_sys_socket net/socket.c:1520 [inline] __x64_sys_socket+0x4c/0x60 net/socket.c:1520 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8644 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================