================================================================== BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal write to 0xffff8881054350ac of 4 bytes by task 1744 on cpu 0: freezer_do_not_count include/linux/freezer.h:109 [inline] freezable_schedule include/linux/freezer.h:171 [inline] futex_wait_queue_me+0x198/0x260 kernel/futex.c:2606 futex_wait+0x143/0x430 kernel/futex.c:2708 do_futex+0x9e8/0x1e10 kernel/futex.c:3734 __do_sys_futex kernel/futex.c:3797 [inline] __se_sys_futex+0x2a8/0x390 kernel/futex.c:3763 __x64_sys_futex+0x74/0x80 kernel/futex.c:3763 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881054350ac of 4 bytes by task 1746 on cpu 1: sig_task_ignored kernel/signal.c:94 [inline] sig_ignored kernel/signal.c:119 [inline] prepare_signal+0x872/0xd80 kernel/signal.c:962 __send_signal+0x64/0x760 kernel/signal.c:1082 send_signal+0x38e/0x3d0 kernel/signal.c:1242 do_send_sig_info kernel/signal.c:1291 [inline] do_send_specific+0x13d/0x1c0 kernel/signal.c:3827 do_tkill kernel/signal.c:3853 [inline] __do_sys_tgkill kernel/signal.c:3872 [inline] __se_sys_tgkill kernel/signal.c:3866 [inline] __x64_sys_tgkill+0x108/0x140 kernel/signal.c:3866 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1746 Comm: syz-fuzzer Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================