syzbot

 sign-in | mailing list | source | docs
🐞 Open [1572]
≡ Subsystems
🐞 Fixed [6404]
🐞 Invalid [16286]
⬇ Missing Backports [199]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KCSAN: data-race in unix_poll / unix_release_sock (5)

Status: auto-obsoleted due to no activity on 2022/11/04 19:08
Subsystems: net
[Documentation on labels]
First crash: 1020d, last: 1020d
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in unix_poll / unix_release_sock (6) net 6 5 829d 925d 0/29 auto-obsoleted due to no activity on 2023/05/14 22:15
upstream KCSAN: data-race in unix_poll / unix_release_sock (3) net 6 1 1104d 1104d 0/29 auto-closed as invalid on 2022/08/12 09:16
upstream KCSAN: data-race in unix_poll / unix_release_sock net 6 1 1553d 1553d 0/29 auto-closed as invalid on 2021/05/21 02:26
upstream KCSAN: data-race in unix_poll / unix_release_sock (4) net 6 1 1058d 1058d 0/29 auto-closed as invalid on 2022/09/28 03:19
upstream KCSAN: data-race in unix_poll / unix_release_sock (2) net 6 1 1512d 1512d 0/29 auto-closed as invalid on 2021/06/30 15:16

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

write to 0xffff888103b74660 of 4 bytes by task 13062 on cpu 0:
 unix_release_sock+0x3d5/0x760 net/unix/af_unix.c:631
 unix_release+0x4e/0x70 net/unix/af_unix.c:1010
 __sock_release net/socket.c:650 [inline]
 sock_close+0x6c/0x150 net/socket.c:1365
 __fput+0x292/0x510 fs/file_table.c:320
 ____fput+0x11/0x20 fs/file_table.c:353
 task_work_run+0x8e/0x110 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x130 kernel/entry/common.c:169
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888103b74660 of 4 bytes by task 13064 on cpu 1:
 unix_poll+0x6d/0x250 net/unix/af_unix.c:3139
 sock_poll+0x23e/0x260 net/socket.c:1353
 vfs_poll include/linux/poll.h:88 [inline]
 io_poll_check_events+0x183/0x360 io_uring/poll.c:233
 io_apoll_task_func+0x1a/0xa0 io_uring/poll.c:295
 handle_tw_list+0x12a/0x180 io_uring/io_uring.c:984
 tctx_task_work+0xbd/0x360 io_uring/io_uring.c:1037
 task_work_run+0x8e/0x110 kernel/task_work.c:177
 get_signal+0xeca/0x1020 kernel/signal.c:2634
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000 -> 0x00000068

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13064 Comm: syz-executor.1 Not tainted 6.0.0-rc7-syzkaller-00180-g70575e77839f-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/09/30 18:59 upstream 70575e77839f feb56351 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in unix_poll / unix_release_sock
* Struck through repros no longer work on HEAD.