KCSAN: data-race in ksys_write / ksys_write (8)

Status: auto-obsoleted due to no activity on 2022/12/14 10:38
Subsystems: fs
[Documentation on labels]
First crash: 1358d, last: 1358d
▶ ▼ Similar bugs (13)
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 1516d 1516d 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 2196d 2196d 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 2011d 2034d 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 1651d 1668d 0/29 auto-closed as invalid on 2022/02/24 13:47
upstream KCSAN: data-race in ksys_write / ksys_write (14) fs race:benign prio:low 6 1 10d 10d 0/29 moderation: reported on 2026/07/19 15:36
upstream KCSAN: data-race in ksys_write / ksys_write (7) fs 6 5 1395d 1466d 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 612d 612d 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 975d 963d 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 1109d 1109d 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 2082d 2060d 0/29 auto-closed as invalid on 2020/12/21 12:01
upstream KCSAN: data-race in ksys_write / ksys_write fs 6 8 2263d 2452d 0/29 auto-closed as invalid on 2020/06/22 09:42
upstream KCSAN: data-race in ksys_write / ksys_write (9) fs 6 2 1200d 1264d 0/29 auto-obsoleted due to no activity on 2023/05/22 00:31
upstream KCSAN: data-race in ksys_write / ksys_write (12) fs 6 3 892d 919d 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 0xffff88813e467b68 of 8 bytes by task 27678 on cpu 0:
 ksys_write+0x11b/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+0x3e/0x50 fs/read_write.c:646
 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

write to 0xffff88813e467b68 of 8 bytes by task 27679 on cpu 1:
 ksys_write+0x11b/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+0x3e/0x50 fs/read_write.c:646
 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: 0x000000000000002c -> 0x000000000000005c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 27679 Comm: syz-executor.2 Not tainted 6.1.0-rc4-syzkaller-00015-gf141df371335-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/11/09 10:30 upstream f141df371335 5fa28208 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in ksys_write / ksys_write
* Struck through repros no longer work on HEAD.