================================================================== BUG: KCSAN: data-race in fasync_remove_entry / sock_wake_async write to 0xffff8881005a2a98 of 8 bytes by task 18943 on cpu 1: fasync_remove_entry+0xcc/0x120 fs/fcntl.c:1005 fasync_helper+0x97/0xc0 fs/fcntl.c:1104 sock_fasync+0x58/0xc0 net/socket.c:1416 __fput+0x5e6/0x650 fs/file_table.c:462 ____fput+0x1c/0x30 fs/file_table.c:493 task_work_run+0x12e/0x1a0 kernel/task_work.c:227 resume_user_mode_work+0x6a/0x70 include/linux/resume_user_mode.h:50 exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x77/0xb0 kernel/entry/common.c:218 do_syscall_64+0xdd/0x1a0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff8881005a2a98 of 8 bytes by task 18942 on cpu 0: sock_wake_async+0x29/0x110 net/socket.c:1431 sk_wake_async_rcu include/net/sock.h:2505 [inline] unix_write_space+0x13b/0x140 net/unix/af_unix.c:604 sock_wfree+0x148/0x3c0 net/core/sock.c:2629 unix_destruct_scm+0xc3/0xf0 net/unix/af_unix.c:1869 skb_release_head_state+0xba/0x1a0 net/core/skbuff.c:1149 skb_release_all net/core/skbuff.c:1160 [inline] __kfree_skb+0x18/0x150 net/core/skbuff.c:1176 sk_skb_reason_drop+0xbd/0x270 net/core/skbuff.c:1214 kfree_skb_reason include/linux/skbuff.h:1279 [inline] unix_release_sock+0x5d3/0x720 net/unix/af_unix.c:712 unix_release+0x58/0x80 net/unix/af_unix.c:1097 __sock_release net/socket.c:647 [inline] sock_close+0x6b/0x150 net/socket.c:1391 __fput+0x298/0x650 fs/file_table.c:465 ____fput+0x1c/0x30 fs/file_table.c:493 task_work_run+0x12e/0x1a0 kernel/task_work.c:227 resume_user_mode_work+0x6a/0x70 include/linux/resume_user_mode.h:50 exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x77/0xb0 kernel/entry/common.c:218 do_syscall_64+0xdd/0x1a0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xffff8881192521e0 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 18942 Comm: syz.4.3843 Not tainted 6.15.0-rc7-syzkaller-00112-geccf6f2f6ab9 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ==================================================================