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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: 377d, last: 16h31m
▶ ▼ 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 C 1864 2266d 2327d 15/29 fixed on 2020/04/15 17:19
upstream unregister_netdevice: waiting for DEV to become free (6) 2 C error 13128 1574d 1693d 20/29 fixed on 2022/03/08 16:11
upstream unregister_netdevice: waiting for DEV to become free 2 C 170521 2882d 2993d 8/29 fixed on 2018/08/08 18:10
linux-4.14 unregister_netdevice: waiting for DEV to become free 2 C done 120 2189d 2628d 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 C done 10505 4h35m 1210d 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 2626 1h24m 50d 0/29 upstream: reported syz repro on 2026/05/10 20:18
android-49 unregister_netdevice: waiting for DEV to become free 2 C 52164 2409d 2636d 0/3 public: reported C repro on 2019/04/11 08:44
android-44 unregister_netdevice: waiting for DEV to become free 2 C 4307 2471d 2636d 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 C 651522 1210d 2146d 0/1 upstream: reported C repro on 2020/08/13 09:52
android-414 unregister_netdevice: waiting for DEV to become free 2 1231 2412d 2635d 0/1 auto-closed as invalid on 2020/02/19 10:10
upstream unregister_netdevice: waiting for DEV to become free (4) 2 C done 50394 1938d 2140d 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 C inconclusive 5391 2h20m 1210d 0/3 upstream: reported C repro on 2023/03/07 18:05
upstream unregister_netdevice: waiting for DEV to become free (8) net 2 C done 443850 54d 1116d 29/29 fixed on 2026/05/06 19:02
upstream unregister_netdevice: waiting for DEV to become free (2) 2 C done 385621 2328d 2875d 15/29 fixed on 2020/02/14 01:19
linux-4.19 unregister_netdevice: waiting for DEV to become free 2 C 5316 1210d 2637d 0/1 upstream: reported C repro on 2019/04/10 19:11
upstream unregister_netdevice: waiting for DEV to become free (5) 2 C done 40035 1693d 1938d 20/29 fixed on 2021/11/10 00:50
upstream unregister_netdevice: waiting for DEV to become free (7) 2 C inconclusive 20422 1117d 1319d 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 (758):
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
2026/06/29 10:04 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/29 06:36 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/29 04:38 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/29 01:58 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/29 00:33 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/28 22:44 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/28 16:33 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/28 13:31 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/28 02:57 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/27 19:04 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/27 02:30 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/26 20:52 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/24 08:32 linux-6.6.y d1cfde2d5d15 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/24 07:17 linux-6.6.y d1cfde2d5d15 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/22 08:32 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/21 20:37 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/21 17:51 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/21 13:31 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/21 02:39 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/20 20:55 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/20 04:56 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/17 08:50 linux-6.6.y 924b4a879cbb 62cc6db3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2026/06/17 03:50 linux-6.6.y 924b4a879cbb 62cc6db3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2026/06/15 12:23 linux-6.6.y 924b4a879cbb 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/15 01:41 linux-6.6.y 924b4a879cbb 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/13 17:09 linux-6.6.y 924b4a879cbb 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/13 11:21 linux-6.6.y 924b4a879cbb 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/13 00:36 linux-6.6.y 924b4a879cbb 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/12 11:30 linux-6.6.y 924b4a879cbb e93da63e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/11 06:09 linux-6.6.y 924b4a879cbb b754d2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/10 10:02 linux-6.6.y 924b4a879cbb 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/10 07:43 linux-6.6.y 924b4a879cbb 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/09 09:30 linux-6.6.y 924b4a879cbb 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/09 00:38 linux-6.6.y 924b4a879cbb 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/08 09:39 linux-6.6.y 924b4a879cbb cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/08 07:59 linux-6.6.y 924b4a879cbb cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/08 06:30 linux-6.6.y 924b4a879cbb cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/07 22:54 linux-6.6.y 924b4a879cbb cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/07 08:22 linux-6.6.y 924b4a879cbb cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/06 07:52 linux-6.6.y 924b4a879cbb cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/04 13:23 linux-6.6.y 924b4a879cbb 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/04 06:34 linux-6.6.y 924b4a879cbb 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/03 09:47 linux-6.6.y 924b4a879cbb 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf unregister_netdevice: waiting for DEV to become free
2026/06/03 05:43 linux-6.6.y 924b4a879cbb 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/02 18:53 linux-6.6.y 924b4a879cbb 62fe1528 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/01 06:23 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/06/01 05:16 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/31 20:53 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/31 16:23 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/31 11:21 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/31 05:48 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/31 01:00 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/30 21:40 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/30 15:32 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/30 04:18 linux-6.6.y 0a40c6fbd105 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/28 19:49 linux-6.6.y 0a40c6fbd105 681715f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/27 06:07 linux-6.6.y 0a40c6fbd105 2b01f00e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan unregister_netdevice: waiting for DEV to become free
2026/05/26 05:51 linux-6.6.y 0a40c6fbd105 c69befb3 .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.