syzbot


KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (8)

Status: auto-closed as invalid on 2022/04/14 22:36
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 269d, last: 269d
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 369d 369d 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 1051d 1066d 0/24 auto-closed as invalid on 2020/03/29 01:10
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (4) 20 692d 724d 0/24 auto-closed as invalid on 2021/02/16 06:00
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (7) 1 322d 319d 0/24 auto-closed as invalid on 2022/02/21 00:16
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (3) 1 855d 855d 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 391d 543d 22/24 fixed on 2021/11/10 00:50
upstream KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock (2) 1 893d 893d 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 0xffff888108d5796a of 1 bytes by task 16425 on cpu 0:
 unix_release_sock+0x2b9/0x6a0 net/unix/af_unix.c:607
 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:317
 ____fput+0x11/0x20 fs/file_table.c:350
 task_work_run+0x8e/0x110 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:188 [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 0xffff888108d5796a of 1 bytes by task 16456 on cpu 1:
 sock_alloc_send_pskb+0x113/0x4e0 net/core/sock.c:2571
 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 net/socket.c:2467 [inline]
 __sys_sendmmsg+0x267/0x4c0 net/socket.c:2553
 __do_sys_sendmmsg net/socket.c:2582 [inline]
 __se_sys_sendmmsg net/socket.c:2579 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2579
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00 -> 0x03

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16456 Comm: syz-executor.4 Not tainted 5.17.0-rc7-syzkaller-00105-g1db333d9a51f-dirty #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 2022/03/10 22:33 upstream 1db333d9a51f 9e8eaa75 .config log report info KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock
* Struck through repros no longer work on HEAD.