KCSAN: data-race in _prb_read_valid / string

Status: moderation: reported on 2026/09/15 22:42
Subsystems: kernel
Labels: race:benign prio:high
[Documentation on labels]
Reported-by: syzbot+22c029711f37397ac9e3@syzkaller.appspotmail.com
First crash: 31d, last: 7d01h
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
ef072842 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ✅ PeripheralTrigger: ✅ RemoteTrigger: ✅ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ✅ VMHostTrigger: ✅ ❓ KCSAN: data-race in _prb_read_valid / string 2026/09/17 03:04 2026/09/17 03:04 2026/09/17 03:34 95928915
d35ae6e6 assessment-kcsan Benign: ✅ ❓ KCSAN: data-race in _prb_read_valid / string 2026/09/15 22:42 2026/09/15 22:42 2026/09/15 23:16 2daa4bb5

Sample crash report:
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BUG: KCSAN: data-race in _prb_read_valid / string

write to 0xffffffff895e1d40 of 1 bytes by task 26552 on cpu 0:

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/10 13:42 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in _prb_read_valid / string
2026/09/15 22:42 upstream f6e7b42bf05b 2daa4bb5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in _prb_read_valid / string
* Struck through repros no longer work on HEAD.