KCSAN: data-race in unix_release_sock / unix_stream

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in unix_release_sock / unix_stream_sendpage net				1	1635d	1635d	0/26	closed as invalid on 2019/11/19 13:44
upstream	KCSAN: data-race in unix_release_sock / unix_stream_sendpage (3) net				1	1290d	1290d	0/26	auto-closed as invalid on 2020/11/07 07:43

================================================================== BUG: KCSAN: data-race in unix_release_sock / unix_stream_sendpage write to 0xffff888121f95a6a of 1 bytes by task 10394 on cpu 0: unix_release_sock+0x4fd/0x660 net/unix/af_unix.c:542 unix_release+0x3e/0x70 net/unix/af_unix.c:842 __sock_release+0x85/0x160 net/socket.c:592 sock_close+0x24/0x30 net/socket.c:1270 __fput+0x1e1/0x520 fs/file_table.c:280 ____fput+0x1f/0x30 fs/file_table.c:313 task_work_run+0xf6/0x130 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2b4/0x2c0 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+0x384/0x3a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888121f95a6a of 1 bytes by task 10398 on cpu 1: unix_stream_sendpage+0x1ed/0x8f0 net/unix/af_unix.c:1920 kernel_sendpage+0x7b/0xc0 net/socket.c:3776 sock_sendpage+0x6c/0x90 net/socket.c:937 pipe_to_sendpage+0x102/0x1a0 fs/splice.c:458 splice_from_pipe_feed fs/splice.c:512 [inline] __splice_from_pipe+0x295/0x4a0 fs/splice.c:636 splice_from_pipe+0xbb/0x100 fs/splice.c:671 generic_splice_sendpage+0x45/0x60 fs/splice.c:844 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 10398 Comm: syz-executor.3 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================