syzbot


SYZFAIL: tun: ioctl(TUNSETIFF) failed

Status: upstream: reported syz repro on 2025/10/06 05:00
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+bf371e84328aea45f0cb@syzkaller.appspotmail.com
First crash: 101d, last: 2d18h
Bug presence (2)
Date Name Commit Repro Result
2026/01/13 linux-6.6.y (ToT) c596736dadab syz [report] SYZFAIL: tun: ioctl(TUNSETIFF) failed
2026/01/13 upstream (ToT) b71e635feefc syz Didn't crash
Similar bugs (13)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 SYZFAIL: tun: ioctl(TUNSETIFF) failed origin:lts -1 syz 140 3d20h 565d 0/2 premoderation: reported syz repro on 2024/06/30 02:15
android-54 SYZFAIL: tun: ioctl(TUNSETIFF) failed -1 1 1522d 1522d 0/2 closed as invalid on 2021/11/16 09:11
linux-5.15 SYZFAIL: tun: ioctl(TUNSETIFF) failed -1 10 207d 438d 0/3 auto-obsoleted due to no activity on 2025/09/30 19:38
android-6-12 SYZFAIL: tun: ioctl(TUNSETIFF) failed -1 112 64d 210d 0/1 auto-obsoleted due to no activity on 2026/01/01 11:58
android-54 SYZFAIL: tun: ioctl(TUNSETIFF) failed (4) -1 75 238d 351d 0/2 auto-obsoleted due to no activity on 2025/07/11 21:09
linux-5.15 SYZFAIL: tun: ioctl(TUNSETIFF) failed (2) origin:lts-only -1 syz 6 2d17h 97d 0/3 upstream: reported syz repro on 2025/10/11 00:29
android-54 SYZFAIL: tun: ioctl(TUNSETIFF) failed (3) -1 3 565d 570d 0/2 auto-obsoleted due to no activity on 2024/09/27 11:34
android-5-10 SYZFAIL: tun: ioctl(TUNSETIFF) failed -1 7 1378d 1537d 0/2 auto-closed as invalid on 2022/07/07 13:54
android-6-1 SYZFAIL: tun: ioctl(TUNSETIFF) failed origin:downstream -1 syz 119 3d16h 557d 0/2 premoderation: reported syz repro on 2024/07/07 21:01
android-54 SYZFAIL: tun: ioctl(TUNSETIFF) failed (2) -1 3 1381d 1399d 0/2 auto-closed as invalid on 2022/08/03 05:52
linux-6.1 SYZFAIL: tun: ioctl(TUNSETIFF) failed (2) -1 syz 23 3d20h 298d 0/3 upstream: reported syz repro on 2025/03/23 07:07
android-5-10 SYZFAIL: tun: ioctl(TUNSETIFF) failed (2) -1 syz 1010 12h11m 569d 0/2 premoderation: reported syz repro on 2024/06/25 10:31
linux-6.1 SYZFAIL: tun: ioctl(TUNSETIFF) failed -1 1 403d 403d 0/3 auto-obsoleted due to no activity on 2025/03/18 21:55

Sample crash report:
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: tun: ioctl(TUNSETIFF) failed
 (errno 25: Inappropriate ioctl for device)
loop exited with status 67
SYZFAIL: repeatedly failed to execute the program
proc=3 req=2434 state=3 status=67 (errno 32: Broken pipe)
connection error: failed to recv *flatrpc.ExecutorMessageRawT: read tcp 127.0.0.1:36943->127.0.0.1:50702: read: connection reset by peer

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/12 10:30 linux-6.6.y c596736dadab d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf SYZFAIL: tun: ioctl(TUNSETIFF) failed
2026/01/13 10:27 linux-6.6.y c596736dadab d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf SYZFAIL: tun: ioctl(TUNSETIFF) failed
2026/01/04 03:33 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf SYZFAIL: tun: ioctl(TUNSETIFF) failed
2025/12/25 02:24 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf SYZFAIL: tun: ioctl(TUNSETIFF) failed
2025/12/24 16:10 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf SYZFAIL: tun: ioctl(TUNSETIFF) failed
2025/11/23 20:22 linux-6.6.y 0a805b6ea8cd 4fb8ef37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf SYZFAIL: tun: ioctl(TUNSETIFF) failed
2025/10/10 21:51 linux-6.6.y e617101e5626 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan SYZFAIL: tun: ioctl(TUNSETIFF) failed
2025/10/06 04:59 linux-6.6.y f34f16e5c632 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan SYZFAIL: tun: ioctl(TUNSETIFF) failed
* Struck through repros no longer work on HEAD.