syzbot

 sign-in | mailing list | source | docs | 🏰
🐞 Open [1341]
≡ Subsystems
🐞 Fixed [7057]
🐞 Invalid [18485]
⬇ Missing Backports [222]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
✨ AI
💬 Send us feedback

KCSAN: data-race in ksys_write / ksys_write (9)

Status: auto-obsoleted due to no activity on 2023/05/22 00:31
Subsystems: fs
[Documentation on labels]
First crash: 1157d, last: 1093d
▶ ▼ Similar bugs (12)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in ksys_write / ksys_write (6) fs 6 1 1409d 1409d 0/29 auto-closed as invalid on 2022/07/09 10:17
upstream KCSAN: data-race in ksys_write / ksys_write (2) fs 6 1 2090d 2090d 0/29 auto-closed as invalid on 2020/08/28 08:07
upstream KCSAN: data-race in ksys_write / ksys_write (4) fs 6 2 1904d 1927d 0/29 auto-closed as invalid on 2021/03/01 11:18
upstream KCSAN: data-race in ksys_write / ksys_write (5) fs 6 2 1544d 1561d 0/29 auto-closed as invalid on 2022/02/24 13:47
upstream KCSAN: data-race in ksys_write / ksys_write (8) fs 6 1 1251d 1251d 0/29 auto-obsoleted due to no activity on 2022/12/14 10:38
upstream KCSAN: data-race in ksys_write / ksys_write (7) fs 6 5 1289d 1359d 0/29 auto-obsoleted due to no activity on 2022/11/07 06:37
upstream KCSAN: data-race in ksys_write / ksys_write (13) fs 6 1 505d 505d 0/29 auto-obsoleted due to no activity on 2025/01/19 23:33
upstream KCSAN: data-race in ksys_write / ksys_write (11) fs 6 8 868d 856d 0/29 auto-obsoleted due to no activity on 2024/01/01 18:01
upstream KCSAN: data-race in ksys_write / ksys_write (10) fs 6 1 1002d 1002d 0/29 auto-obsoleted due to no activity on 2023/08/20 13:19
upstream KCSAN: data-race in ksys_write / ksys_write (3) fs 6 1 1975d 1953d 0/29 auto-closed as invalid on 2020/12/21 12:01
upstream KCSAN: data-race in ksys_write / ksys_write fs 6 8 2156d 2345d 0/29 auto-closed as invalid on 2020/06/22 09:42
upstream KCSAN: data-race in ksys_write / ksys_write (12) fs 6 3 786d 812d 0/29 auto-obsoleted due to no activity on 2024/03/24 05:08

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

write to 0xffff888103305168 of 8 bytes by task 23950 on cpu 0:
 ksys_write+0x11e/0x1a0 fs/read_write.c:639
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff888103305168 of 8 bytes by task 23951 on cpu 1:
 ksys_write+0x11e/0x1a0 fs/read_write.c:639
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0x000000000000000e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23951 Comm: syz-executor.3 Not tainted 6.3.0-rc6-syzkaller-00188-g3e7bb4f24617 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/04/17 00:20 upstream 3e7bb4f24617 ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in ksys_write / ksys_write
2023/02/11 16:50 upstream 420b2d431d18 93e26d60 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ksys_write / ksys_write
* Struck through repros no longer work on HEAD.