syzbot


WARNING: suspicious RCU usage (5)

Status: fixed on 2022/06/24 08:21
Reported-by: syzbot+9cbc6bed3a22f1d37395@syzkaller.appspotmail.com
Fix commit: f4e61f0c9add x86/kvm: Fix broken irq restoration in kvm_wait
First crash: 238d, last: 238d

Cause bisection: introduced by (bisect log) :
commit c2ff53d8049f30098153cd2d1299a44d7b124c57
Author: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: Thu Feb 18 20:50:02 2021 +0000

  net: Add priv_flags for allow tx skb without linear

Crash: WARNING in kvm_wait (log)
Repro: C syz .config
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING: suspicious RCU usage 1 1999d 1999d 0/24 closed as invalid on 2017/08/17 16:34
upstream WARNING: suspicious RCU usage (4) C done 1 1619d 1617d 14/24 fixed on 2019/10/04 12:05
upstream WARNING: suspicious RCU usage (3) 16 1895d 1896d 3/24 fixed on 2017/12/21 04:38

Sample crash report:
netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
=============================
WARNING: suspicious RCU usage
5.19.0-rc1-syzkaller-00254-ga5b00f5b78b7 #0 Not tainted
-----------------------------
net/ipv6/addrconf

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-net-this-kasan-gce 2022/06/13 22:49 net a5b00f5b78b7 0d5abf15 .config console log report syz C WARNING: suspicious RCU usage
* Struck through repros no longer work on HEAD.