syzbot


SYZFAIL: tun: read failed (4)

Status: upstream: reported on 2025/12/06 16:26
Reported-by: syzbot+4394c382e90c8b58a3f7@syzkaller.appspotmail.com
First crash: 6d16h, last: 6d16h
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
freebsd SYZFAIL: tun: read failed -1 syz 1040 1674d 1755d 0/2 closed as invalid on 2021/05/14 14:10
freebsd SYZFAIL: tun: read failed (2) -1 19 1508d 1541d 0/2 auto-closed as invalid on 2022/01/25 09:19
freebsd SYZFAIL: tun: read failed (3) -1 1 1376d 1376d 0/2 auto-closed as invalid on 2022/06/05 15:58

Sample crash report:
SYZFAIL: tun: read failed
 (errno 9: Bad file descriptor)
SYZFAIL: child failed
 (errno 0: No error: 0)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: open of /dev/kcov failed
 (errno 2: No such file or directory)
SYZFAIL: repeatedly failed to execute the program
proc=1 req=184 state=1 status=67 (errno 9: Bad file descriptor)


FreeBSD/amd64 (ci-freebsd-main-3.us-central1-b.c.syzkaller.internal) (ttyu0)

login: if_delmulti_locked: detaching ifnet instance 0xfffffe006e79f800
if_delmulti_locked: detaching ifnet instance 0xfffffe0007795000
set $lines = 0
Password:
Login incorrect
login: show registers
Password:
Login incorrect
login: ps
Password:
Login incorrect
login: show malloc
Password:
Login incorrect
show all tcpcbs/bl

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/06 16:25 freebsd-src ced74610217f cee4cb10 console log report ci-freebsd-main SYZFAIL: tun: read failed
* Struck through repros no longer work on HEAD.