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================================================================== BUG: KCSAN: data-race in fasync_remove_entry / kill_fasync write to 0xffff88810699fa58 of 8 bytes by task 5698 on cpu 0: fasync_remove_entry+0xd9/0x180 fs/fcntl.c:894 fasync_helper+0x92/0xc0 fs/fcntl.c:993 sock_fasync+0x5c/0xc0 net/socket.c:1283 __fput+0x49f/0x4e0 fs/file_table.c:277 ____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 read to 0xffff88810699fa58 of 8 bytes by task 5695 on cpu 1: kill_fasync+0x1e/0x160 fs/fcntl.c:1031 sock_wake_async+0xea/0x100 net/socket.c:1312 sk_wake_async include/net/sock.h:2311 [inline] unix_release_sock+0x383/0x6e0 net/unix/af_unix.c:553 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: 5695 Comm: syz-executor.4 Not tainted 5.13.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021/05/19 11:03 | upstream | 8ac91e6c6033 | a343ba6b | .config | console log | report | info | ci2-upstream-kcsan-gce | KCSAN: data-race in fasync_remove_entry / kill_fasync |