syzbot


KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (7)

Status: auto-closed as invalid on 2022/02/21 00:16
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 320d, last: 320d
similar bugs (7):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (6) 1 367d 367d 0/24 auto-closed as invalid on 2022/01/05 01:52
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock 2 1049d 1063d 0/24 auto-closed as invalid on 2020/03/29 01:10
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (8) 1 267d 267d 0/24 auto-closed as invalid on 2022/04/14 22:36
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (4) 20 689d 721d 0/24 auto-closed as invalid on 2021/02/16 06:00
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (3) 1 853d 853d 0/24 auto-closed as invalid on 2020/09/05 23:08
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (5) 47 389d 540d 22/24 fixed on 2021/11/10 00:50
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (2) 1 890d 890d 0/24 auto-closed as invalid on 2020/07/30 12:33

Sample crash report:
==================================================================
BUG: KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock

write to 0xffff8881020c9768 of 4 bytes by task 22666 on cpu 0:
 unix_release_sock+0x30a/0x6a0 net/unix/af_unix.c:609
 unix_release+0x4e/0x70 net/unix/af_unix.c:990
 __sock_release net/socket.c:650 [inline]
 sock_close+0x6c/0x150 net/socket.c:1318
 __fput+0x295/0x520 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0x8e/0x110 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x160/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881020c9768 of 4 bytes by task 22678 on cpu 1:
 sock_wait_for_wmem net/core/sock.c:2538 [inline]
 sock_alloc_send_pskb+0x371/0x4e0 net/core/sock.c:2579
 unix_dgram_sendmsg+0x428/0x15d0 net/unix/af_unix.c:1896
 unix_seqpacket_sendmsg+0xcc/0x110 net/unix/af_unix.c:2346
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 ____sys_sendmsg+0x39a/0x510 net/socket.c:2413
 __sys_sendmsg_sock+0x25/0x30 net/socket.c:2479
 io_sendmsg fs/io_uring.c:4953 [inline]
 io_issue_sqe+0x474a/0x98c0 fs/io_uring.c:6730
 io_wq_submit_work+0x1c5/0x370 fs/io_uring.c:6875
 io_worker_handle_work+0x4ca/0xbd0 fs/io-wq.c:576
 io_wqe_worker+0x1bc/0x4f0 fs/io-wq.c:632
 ret_from_fork+0x1f/0x30

value changed: 0x00000000 -> 0x00000068

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22678 Comm: iou-wrk-22667 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/01/17 00:07 upstream 79e06c4c4950 723cfaf0 .config log report info KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock
* Struck through repros no longer work on HEAD.