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: 437d, last: 1d05h
▶ ▼ 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 2327d 2388d 15/29 fixed on 2020/04/15 17:19
upstream unregister_netdevice: waiting for DEV to become free (6) 2 syz, C error 13128 1635d 1753d 20/29 fixed on 2022/03/08 16:11
upstream unregister_netdevice: waiting for DEV to become free 2 syz, C 170521 2943d 3054d 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 2250d 2688d 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 10685 13h35m 1271d 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 2 syz error 6941 now 111d 0/29 upstream: reported syz repro on 2026/05/10 20:18
android-49 unregister_netdevice: waiting for DEV to become free 2 syz, C 52164 2470d 2697d 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 2532d 2697d 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 1271d 2207d 0/1 upstream: reported C repro on 2020/08/13 09:52
android-414 unregister_netdevice: waiting for DEV to become free 2 1231 2473d 2695d 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 1998d 2201d 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 5796 10h43m 1271d 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 115d 1176d 29/29 fixed on 2026/05/06 19:02
upstream unregister_netdevice: waiting for DEV to become free (2) 2 syz, C done 385621 2388d 2936d 15/29 fixed on 2020/02/14 01:19
linux-4.19 unregister_netdevice: waiting for DEV to become free 2 syz, C 5316 1271d 2698d 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 1753d 1998d 20/29 fixed on 2021/11/10 00:50
upstream unregister_netdevice: waiting for DEV to become free (7) 2 syz, C inconclusive 20422 1178d 1380d 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 (834):
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
2026/08/28 17:48 linux-6.6.y a4a971135a2f e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/28 00:53 linux-6.6.y 93e0c9521fa8 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/27 18:33 linux-6.6.y 93e0c9521fa8 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/26 03:31 linux-6.6.y dc6160265ffc 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/26 03:31 linux-6.6.y dc6160265ffc 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/25 23:30 linux-6.6.y dc6160265ffc a9a1fc32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/25 14:47 linux-6.6.y dc6160265ffc a9a1fc32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/25 09:50 linux-6.6.y dc6160265ffc 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/24 14:20 linux-6.6.y dc6160265ffc b55bd4c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/24 03:43 linux-6.6.y dc6160265ffc 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/22 21:56 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/20 18:10 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/20 09:22 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/19 20:50 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/18 05:22 linux-6.6.y d27334b2888c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/18 02:20 linux-6.6.y d27334b2888c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/17 20:28 linux-6.6.y d27334b2888c 905244d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/17 15:51 linux-6.6.y d27334b2888c 905244d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/17 06:48 linux-6.6.y d27334b2888c 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/12 04:55 linux-6.6.y d27334b2888c f8d35649 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/11 21:31 linux-6.6.y d27334b2888c 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/08 12:54 linux-6.6.y 6436c12a2ced 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/07 20:44 linux-6.6.y 6436c12a2ced e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/06 22:54 linux-6.6.y 80dfb0405055 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/08/04 22:40 linux-6.6.y aa0e49877a2e d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2026/08/01 10:01 linux-6.6.y a1153c0deb44 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2026/07/31 04:31 linux-6.6.y a1153c0deb44 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/30 23:21 linux-6.6.y a1153c0deb44 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/30 17:08 linux-6.6.y a1153c0deb44 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2026/07/30 05:05 linux-6.6.y ae068b676196 6ef5c1e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/29 11:43 linux-6.6.y c5596480c50e 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/27 22:16 linux-6.6.y c5596480c50e aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/27 18:40 linux-6.6.y c5596480c50e aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/27 15:50 linux-6.6.y c5596480c50e aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/24 11:53 linux-6.6.y da47cbc25466 544adce9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/23 21:14 linux-6.6.y da47cbc25466 71a13572 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/23 05:12 linux-6.6.y da47cbc25466 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/23 03:07 linux-6.6.y da47cbc25466 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/21 14:52 linux-6.6.y da47cbc25466 7c5de9c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/17 13:09 linux-6.6.y da47cbc25466 7f27c57a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/16 22:18 linux-6.6.y da47cbc25466 71b49442 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/14 06:25 linux-6.6.y da47cbc25466 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2026/07/10 05:54 linux-6.6.y da47cbc25466 4167ee25 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/09 17:21 linux-6.6.y da47cbc25466 a0c310a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/06 22:14 linux-6.6.y da47cbc25466 88b240e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/07/06 06:14 linux-6.6.y da47cbc25466 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan 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.