syzbot


KCSAN: data-race in do_writev / do_writev (2)

Status: auto-closed as invalid on 2022/09/01 10:18
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 123d, last: 123d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in do_writev / do_writev 1 316d 316d 0/24 auto-closed as invalid on 2022/02/20 05:25

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

write to 0xffff88813b02a568 of 8 bytes by task 27779 on cpu 1:
 do_writev+0x351/0x4b0 fs/read_write.c:986
 __do_sys_writev fs/read_write.c:1057 [inline]
 __se_sys_writev fs/read_write.c:1054 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1054
 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 0xffff88813b02a568 of 8 bytes by task 27777 on cpu 0:
 do_writev+0x351/0x4b0 fs/read_write.c:986
 __do_sys_writev fs/read_write.c:1057 [inline]
 __se_sys_writev fs/read_write.c:1054 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1054
 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: 0x00000000000032d6 -> 0x00000000000054ba

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27777 Comm: syz-executor.3 Not tainted 5.19.0-rc8-syzkaller-00025-g6e7765cb477a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
==================================================================

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/07/28 10:16 upstream 6e7765cb477a fb95c74d .config log report info KCSAN: data-race in do_writev / do_writev
* Struck through repros no longer work on HEAD.