================================================================== BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal write to 0xffff888100da606c of 4 bytes by task 1761 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+0x9d8/0x1ee0 kernel/futex.c:3732 __do_sys_futex kernel/futex.c:3805 [inline] __se_sys_futex+0x21c/0x380 kernel/futex.c:3786 __x64_sys_futex+0x74/0x80 kernel/futex.c:3786 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888100da606c of 4 bytes by task 1764 on cpu 1: sig_task_ignored kernel/signal.c:93 [inline] sig_ignored kernel/signal.c:118 [inline] prepare_signal+0x952/0xeb0 kernel/signal.c:1001 __send_signal+0x64/0x760 kernel/signal.c:1121 send_signal+0x281/0x390 kernel/signal.c:1284 do_send_sig_info kernel/signal.c:1333 [inline] do_send_specific+0x13d/0x1c0 kernel/signal.c:3881 do_tkill kernel/signal.c:3907 [inline] __do_sys_tgkill kernel/signal.c:3926 [inline] __se_sys_tgkill kernel/signal.c:3920 [inline] __x64_sys_tgkill+0x108/0x140 kernel/signal.c:3920 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1764 Comm: syz-fuzzer Not tainted 5.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================