================================================================== BUG: KCSAN: data-race in close_fd / do_select write to 0xffff88811e1d1c60 of 8 bytes by task 13367 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 0xffff88811e1d1c60 of 8 bytes by task 13370 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 do_pselect fs/select.c:763 [inline] __do_sys_pselect6 fs/select.c:804 [inline] __se_sys_pselect6+0x213/0x280 fs/select.c:795 __x64_sys_pselect6+0x78/0x90 fs/select.c:795 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: 0xfffffffffff80007 -> 0xffffffffe0000007 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 13370 Comm: syz-executor.5 Not tainted 6.4.0-syzkaller-11478-gd528014517f2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 ==================================================================