WARNING: suspicious RCU usage in corrupted (2)

WARNING: suspicious RCU usage in corrupted (2)

Status: fixed on 2023/02/24 13:50
Subsystems: net
[Documentation on labels]
Fix commit: 4e43e64d0f13 ipv6: fix lockdep splat in in6_dump_addrs()
First crash: 1235d, last: 1224d

Cause bisection: introduced by (bisect log) [no-op commit]:
commit b9fc8b4a591811546fec2dbef7e9f809362100c9
Author: Grant Seltzer <grantseltzer@gmail.com>
Date: Mon Feb 22 19:58:46 2021 +0000

bpf: Add kernel/modules BTF presence checks to bpftool feature command

Crash: WARNING in kvm_wait (log)
Repro: C syz .config

▶ ▼ Similar bugs (2)

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	WARNING: suspicious RCU usage in corrupted kernel	4	syz	error		1	2732d	2732d	0/29	closed as invalid on 2019/04/08 15:02
upstream	WARNING: suspicious RCU usage in corrupted (3) net	4	C	done	done	1	96d	158d	29/29	fixed on 2025/09/17 14:55

Sample crash report:

=============================
WARNING: suspicious RCU usage
5.19.0-rc2-syzkaller-00147-gf0ec9c65a8d6 #0 Not tainted
-----------------------------
net/ipv6/addrconf.c:5175 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_schedul

Crashes (7):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Manager	Title
2022/06/17 23:03	upstream	f0ec9c65a8d6	cb58b3b2	.config	strace log	report	syz	C	ci-upstream-kasan-gce	WARNING: suspicious RCU usage in corrupted
2022/06/17 22:41	upstream	f0ec9c65a8d6	cb58b3b2	.config	strace log	report	syz	C	ci-upstream-kasan-gce	WARNING: suspicious RCU usage in corrupted
2022/06/13 20:57	upstream	b13baccc3850	0d5abf15	.config	strace log	report	syz	C	ci-upstream-kasan-gce	WARNING: suspicious RCU usage in corrupted
2022/06/25 04:43	net-next-old	5d04b0b634bb	a371c43c	.config	strace log	report	syz	C	ci-upstream-net-kasan-gce	WARNING: suspicious RCU usage in corrupted
2022/06/14 22:55	net-next-old	7e5e8ec7dbd8	127d1faf	.config	console log	report	syz	C	ci-upstream-net-kasan-gce	WARNING: suspicious RCU usage in corrupted
2022/06/14 20:49	net-next-old	7e5e8ec7dbd8	127d1faf	.config	strace log	report	syz	C	ci-upstream-net-kasan-gce	WARNING: suspicious RCU usage in corrupted
2022/06/13 20:52	linux-next	6d0c80680317	0d5abf15	.config	strace log	report	syz	C	ci-upstream-linux-next-kasan-gce-root	WARNING: suspicious RCU usage in corrupted

* ~~Struck through~~ repros no longer work on HEAD.