syzbot

 sign-in | mailing list | source | docs
🐞 Open [1430]
≡ Subsystems
🐞 Fixed [6903]
🐞 Invalid [17965]
⬇ Missing Backports [224]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KCSAN: data-race in do_epoll_ctl / do_epoll_ctl (3)

Status: auto-closed as invalid on 2022/09/16 09:55
Subsystems: fs
[Documentation on labels]
First crash: 1274d, last: 1274d
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in do_epoll_ctl / do_epoll_ctl (4) fs 6 1 965d 965d 0/29 auto-obsoleted due to no activity on 2023/07/22 09:13
upstream KCSAN: data-race in do_epoll_ctl / do_epoll_ctl (2) fs 6 1 1439d 1439d 0/29 auto-closed as invalid on 2022/04/03 20:50
upstream KCSAN: data-race in do_epoll_ctl / do_epoll_ctl (5) fs 6 1 690d 690d 0/29 auto-obsoleted due to no activity on 2024/04/22 09:35
upstream KCSAN: data-race in do_epoll_ctl / do_epoll_ctl fs 6 1 1903d 1883d 0/29 auto-closed as invalid on 2020/12/25 16:54

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

read-write to 0xffffffff870cfc30 of 8 bytes by task 15272 on cpu 1:
 do_epoll_ctl+0x641/0x890 fs/eventpoll.c:2137
 __do_sys_epoll_ctl fs/eventpoll.c:2214 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2205 [inline]
 __x64_sys_epoll_ctl+0xc2/0xf0 fs/eventpoll.c:2205
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff870cfc30 of 8 bytes by task 15276 on cpu 0:
 do_epoll_ctl+0x4ab/0x890 fs/eventpoll.c:2131
 __do_sys_epoll_ctl fs/eventpoll.c:2214 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2205 [inline]
 __x64_sys_epoll_ctl+0xc2/0xf0 fs/eventpoll.c:2205
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000000000000005a -> 0x000000000000005c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15276 Comm: syz-executor.2 Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/08/12 09:45 upstream 7ebfc85e2cd7 402cd70d .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_epoll_ctl / do_epoll_ctl
* Struck through repros no longer work on HEAD.