SYZFAIL: tun: can't open /dev/net/tun

SYZFAIL: tun: can't open /dev/net/tun

Status: upstream: reported syz repro on 2021/10/09 05:44
Reported-by: syzbot+8e7ab08813277a9ae8d8@syzkaller.appspotmail.com
First crash: 712d, last: 569d

Fix bisection: failed (error log, bisect log)

▶ ▼ Similar bugs (4)

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
android-5-10	SYZFAIL: tun: can't open /dev/net/tun				1	683d	683d	0/2	auto-closed as invalid on 2022/02/05 06:28
android-5-10	SYZFAIL: tun: can't open /dev/net/tun (2)	syz	error	error	6	29d	570d	0/2	premoderation: reported syz repro on 2022/02/27 16:56
android-54	SYZFAIL: tun: can't open /dev/net/tun	syz			7	6d02h	759d	0/2	upstream: reported syz repro on 2021/08/23 10:35
upstream	SYZFAIL: tun: can't open /dev/net/tun				1	865d	865d	0/25	auto-closed as invalid on 2021/08/06 17:44

Sample crash report:

2022/02/27 17:07:40 executor failed 11 times: executor 5: failed to write control pipe: write |1: broken pipe
SYZFAIL: tun: can't open /dev/net/tun
 (errno 2: No such file or directory)
loop exited with status 67

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2022/02/27 17:27	linux-4.19.y	3f8a27f9e27b	45a13a73	.config	console log	report	syz				ci2-linux-4-19	SYZFAIL: tun: can't open /dev/net/tun
2021/10/09 05:44	linux-4.19.y	6db10b4d5efd	efe0f24d	.config	console log	report	syz				ci2-linux-4-19	SYZFAIL: tun: can't open /dev/net/tun
2022/02/28 14:19	linux-4.19.y	3f8a27f9e27b	45a13a73	.config	console log	report			info		ci2-linux-4-19	SYZFAIL: tun: can't open /dev/net/tun

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