================================================================== BUG: KCSAN: data-race in close_fd / do_select write to 0xffff8881002daa80 of 8 bytes by task 3804 on cpu 0: instrument_write include/linux/instrumented.h:41 [inline] ___clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:44 [inline] __clear_open_fd fs/file.c:270 [inline] __put_unused_fd fs/file.c:571 [inline] pick_file fs/file.c:649 [inline] close_fd+0xf2/0x1b0 fs/file.c:660 __do_sys_close fs/open.c:1536 [inline] __se_sys_close fs/open.c:1534 [inline] __x64_sys_close+0x1e/0x90 fs/open.c:1534 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff8881002daa80 of 8 bytes by task 3814 on cpu 1: max_select_fd fs/select.c:447 [inline] do_select+0x2a2/0xf90 fs/select.c:490 core_sys_select+0x361/0x520 fs/select.c:681 kern_select fs/select.c:722 [inline] __do_sys_select fs/select.c:729 [inline] __se_sys_select+0x1c7/0x200 fs/select.c:726 __x64_sys_select+0x67/0x80 fs/select.c:726 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0xfffffffffffffe07 -> 0xfffffffffff00007 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3814 Comm: syz-executor.5 Not tainted 6.5.0-rc1-syzkaller-00248-gb6e6cc1f78c7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 ==================================================================