================================================================== BUG: KCSAN: data-race in futex_wait_queue_me / io_req_task_work_add write to 0xffff8881397ff0ac of 4 bytes by task 21151 on cpu 0: freezer_count include/linux/freezer.h:121 [inline] freezable_schedule include/linux/freezer.h:173 [inline] futex_wait_queue_me+0x1ba/0x260 kernel/futex.c:2606 futex_wait+0x143/0x430 kernel/futex.c:2708 do_futex+0x9e8/0x1ee0 kernel/futex.c:3733 __do_sys_futex kernel/futex.c:3796 [inline] __se_sys_futex+0x2a8/0x390 kernel/futex.c:3762 __x64_sys_futex+0x74/0x80 kernel/futex.c:3762 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881397ff0ac of 4 bytes by task 21144 on cpu 1: io_req_task_work_add+0x3f/0x310 fs/io_uring.c:1926 __io_async_wake+0x132/0x260 fs/io_uring.c:4823 io_async_wake+0x77/0x110 fs/io_uring.c:5077 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:108 __wake_up_common_lock kernel/sched/wait.c:138 [inline] __wake_up_sync_key+0x83/0xc0 kernel/sched/wait.c:205 unix_write_space+0xc4/0x130 net/unix/af_unix.c:464 sock_wfree+0xaf/0x150 net/core/sock.c:2066 unix_destruct_scm+0x164/0x190 net/unix/scm.c:150 skb_release_head_state+0xb3/0x170 net/core/skbuff.c:713 skb_release_all net/core/skbuff.c:724 [inline] __kfree_skb+0x14/0x150 net/core/skbuff.c:740 kfree_skb+0x50/0x130 net/core/skbuff.c:758 unix_release_sock+0x575/0x6e0 net/unix/af_unix.c:568 unix_release+0x2f/0x50 net/unix/af_unix.c:859 __sock_release net/socket.c:599 [inline] sock_close+0x6c/0x150 net/socket.c:1258 __fput+0x25b/0x4e0 fs/file_table.c:280 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0xae/0x130 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 21144 Comm: syz-executor.2 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================