unregister_netdevice: waiting for DEV to become free

Status: upstream: reported C repro on 2025/06/18 00:40
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+009b6836b8e397538463@syzkaller.appspotmail.com
First crash: 487d, last: 20h14m
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/06/26 linux-6.6.y (ToT) 6282921b6825 C [report] unregister_netdevice: waiting for DEV to become free
2025/06/26 upstream (ToT) ee88bddf7f2f C Didn't crash
▶ ▼ Similar bugs (17)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream unregister_netdevice: waiting for DEV to become free (3) 2 syz, C 1864 2376d 2438d 15/29 fixed on 2020/04/15 17:19
upstream unregister_netdevice: waiting for DEV to become free (6) 2 syz, C error 13128 1684d 1803d 20/29 fixed on 2022/03/08 16:11
upstream unregister_netdevice: waiting for DEV to become free 2 syz, C 170521 2992d 3103d 8/29 fixed on 2018/08/08 18:10
linux-4.14 unregister_netdevice: waiting for DEV to become free 2 syz, C done 120 2299d 2738d 1/1 fixed on 2020/08/02 06:53
linux-5.15 unregister_netdevice: waiting for DEV to become free missing-backport origin:upstream 2 syz, C done 10871 6h23m 1320d 0/3 upstream: reported C repro on 2023/03/07 22:57
upstream unregister_netdevice: waiting for DEV to become free (9) prio:high net can 2 syz, C error 15520 11m 160d 0/29 upstream: reported C repro on 2026/05/10 20:18
android-49 unregister_netdevice: waiting for DEV to become free 2 syz, C 52164 2520d 2746d 0/3 public: reported C repro on 2019/04/11 08:44
android-44 unregister_netdevice: waiting for DEV to become free 2 syz, C 4307 2581d 2746d 0/2 public: reported C repro on 2019/04/11 08:44
linux-4.14 unregister_netdevice: waiting for DEV to become free (2) fat hfsplus bfs vfs gfs2 udf xfs reiserfs sysv btrfs f2fs 2 syz, C 651522 1320d 2256d 0/1 upstream: reported C repro on 2020/08/13 09:52
android-414 unregister_netdevice: waiting for DEV to become free 2 1231 2522d 2745d 0/1 auto-closed as invalid on 2020/02/19 10:10
upstream unregister_netdevice: waiting for DEV to become free (4) 2 syz, C done 50394 2048d 2250d 19/29 fixed on 2021/03/10 01:48
linux-6.1 unregister_netdevice: waiting for DEV to become free origin:upstream missing-backport 2 syz, C inconclusive 6207 1h40m 1320d 0/3 upstream: reported C repro on 2023/03/07 18:05
upstream unregister_netdevice: waiting for DEV to become free (8) net 2 syz, C done 443850 164d 1226d 29/29 fixed on 2026/05/06 19:02
upstream unregister_netdevice: waiting for DEV to become free (2) 2 syz, C done 385621 2438d 2985d 15/29 fixed on 2020/02/14 01:19
linux-4.19 unregister_netdevice: waiting for DEV to become free 2 syz, C 5316 1321d 2747d 0/1 upstream: reported C repro on 2019/04/10 19:11
upstream unregister_netdevice: waiting for DEV to become free (5) 2 syz, C done 40035 1803d 2048d 20/29 fixed on 2021/11/10 00:50
upstream unregister_netdevice: waiting for DEV to become free (7) 2 syz, C inconclusive 20422 1227d 1429d 22/29 fixed on 2023/06/08 14:41
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/09/30 08:26 1h51m fix candidate upstream OK (0) job log

Sample crash report:
unregister_netdevice: waiting for vcan0 to become free. Usage count = 2

Crashes (951):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/15 20:51 linux-6.6.y c596736dadab d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/01/01 20:24 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2025/12/26 01:09 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2025/12/15 13:42 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2025/12/12 05:51 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2025/12/12 01:44 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2025/12/04 12:42 linux-6.6.y 4791134e4aeb d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2025/11/12 08:45 linux-6.6.y 0a805b6ea8cd 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2025/11/12 04:27 linux-6.6.y 0a805b6ea8cd 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2025/09/01 16:21 linux-6.6.y cc1a1c5b404a 807a3b61 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2025/06/25 15:26 linux-6.6.y 6282921b6825 26d77996 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2026/03/30 06:14 linux-6.6.y c09fbcd31ae6 b5ceaad2 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/02/28 20:37 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/01/14 17:49 linux-6.6.y c596736dadab d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/17 12:00 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/17 09:25 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/17 02:59 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/15 16:14 linux-6.6.y cecd39af8a1a 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/15 04:05 linux-6.6.y a91a6aa9253c 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/15 04:04 linux-6.6.y a91a6aa9253c 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/14 00:49 linux-6.6.y a91a6aa9253c 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/12 17:53 linux-6.6.y a91a6aa9253c 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/11 21:39 linux-6.6.y a91a6aa9253c 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/11 14:53 linux-6.6.y a91a6aa9253c 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/07 13:19 linux-6.6.y a91a6aa9253c 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/05 15:24 linux-6.6.y a91a6aa9253c af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/03 16:36 linux-6.6.y a91a6aa9253c 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/02 04:27 linux-6.6.y 79643295eba1 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/01 17:41 linux-6.6.y 79643295eba1 f5cdae2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/01 15:13 linux-6.6.y 79643295eba1 f5cdae2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/10/01 15:11 linux-6.6.y 79643295eba1 f5cdae2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/30 21:51 linux-6.6.y 79643295eba1 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/30 09:50 linux-6.6.y 79643295eba1 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/29 21:23 linux-6.6.y 79643295eba1 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/29 10:41 linux-6.6.y 79643295eba1 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/29 08:15 linux-6.6.y 79643295eba1 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/29 04:20 linux-6.6.y 79643295eba1 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/28 06:06 linux-6.6.y 79643295eba1 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/26 05:50 linux-6.6.y 79643295eba1 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/26 05:48 linux-6.6.y 79643295eba1 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/25 05:43 linux-6.6.y 79643295eba1 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/24 20:25 linux-6.6.y 79643295eba1 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/24 18:01 linux-6.6.y 79643295eba1 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/24 13:52 linux-6.6.y 79643295eba1 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/24 05:37 linux-6.6.y 79643295eba1 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/23 16:29 linux-6.6.y 79643295eba1 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/23 01:39 linux-6.6.y 79643295eba1 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/22 23:30 linux-6.6.y 79643295eba1 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/22 13:23 linux-6.6.y 79643295eba1 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/21 18:19 linux-6.6.y 79643295eba1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/18 17:49 linux-6.6.y 79643295eba1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/18 10:57 linux-6.6.y 79643295eba1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/17 20:18 linux-6.6.y 79643295eba1 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/16 15:49 linux-6.6.y 79643295eba1 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/16 14:23 linux-6.6.y 79643295eba1 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/16 08:03 linux-6.6.y 79643295eba1 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/09/01 04:40 linux-6.6.y a4a971135a2f 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2025/06/18 00:39 linux-6.6.y c2603c511feb e77fae15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
* Struck through repros no longer work on HEAD.