================================================================== BUG: KCSAN: data-race in unix_release_sock / unix_write_space write to 0xffff88809ea31412 of 1 bytes by task 9693 on cpu 0: unix_release_sock+0x195/0x670 net/unix/af_unix.c:537 unix_release+0x3a/0x60 net/unix/af_unix.c:862 __sock_release+0x85/0x160 net/socket.c:605 sock_close+0x1f/0x30 net/socket.c:1283 __fput+0x1c3/0x4f0 fs/file_table.c:280 ____fput+0x1b/0x30 fs/file_table.c:313 task_work_run+0xf5/0x130 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2ae/0x2c0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x36e/0x390 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88809ea31412 of 1 bytes by task 9691 on cpu 1: unix_writable net/unix/af_unix.c:452 [inline] unix_write_space+0x3a/0x180 net/unix/af_unix.c:461 sock_wfree+0x13e/0x1b0 net/core/sock.c:1958 unix_destruct_scm+0xd2/0x100 net/unix/scm.c:149 skb_release_head_state+0xb0/0x180 net/core/skbuff.c:653 skb_release_all+0x1b/0x50 net/core/skbuff.c:664 __kfree_skb net/core/skbuff.c:680 [inline] kfree_skb net/core/skbuff.c:698 [inline] kfree_skb+0x93/0x200 net/core/skbuff.c:692 unix_release_sock+0x304/0x670 net/unix/af_unix.c:568 unix_release+0x3a/0x60 net/unix/af_unix.c:862 __sock_release+0x85/0x160 net/socket.c:605 sock_close+0x1f/0x30 net/socket.c:1283 __fput+0x1c3/0x4f0 fs/file_table.c:280 ____fput+0x1b/0x30 fs/file_table.c:313 task_work_run+0xf5/0x130 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2ae/0x2c0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x36e/0x390 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 9691 Comm: syz-executor.3 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================