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

Status: auto-obsoleted due to no activity on 2024/02/03 04:06
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+c31a690dc2fc228109f1@syzkaller.appspotmail.com
First crash: 956d, last: 956d
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in do_writev / do_writev (2) fs 6 1 1476d 1476d 0/29 auto-closed as invalid on 2022/09/01 10:18
upstream KCSAN: data-race in do_writev / do_writev fs 6 1 1669d 1669d 0/29 auto-closed as invalid on 2022/02/20 05:25

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

write to 0xffff888133e87f40 of 8 bytes by task 28885 on cpu 1:
 do_writev+0x12b/0x220 fs/read_write.c:978
 __do_sys_writev fs/read_write.c:1049 [inline]
 __se_sys_writev fs/read_write.c:1046 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1046
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888133e87f40 of 8 bytes by task 28891 on cpu 0:
 do_writev+0xb3/0x220 fs/read_write.c:973
 __do_sys_writev fs/read_write.c:1049 [inline]
 __se_sys_writev fs/read_write.c:1046 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1046
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000000000 -> 0x0000000000001279

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28891 Comm: syz-executor.0 Not tainted 6.7.0-rc7-syzkaller-00041-gf016f7547aee #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/12/30 04:05 upstream f016f7547aee fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in do_writev / do_writev
* Struck through repros no longer work on HEAD.