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unregister_netdevice: waiting for DEV to become free (9)

Status: upstream: reported syz repro on 2026/05/10 20:18
Subsystems: net
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+e2af46126e0644cbebdd@syzkaller.appspotmail.com
First crash: 36d, last: 2h05m
Cause bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Ext Bug ID Bug Created Started Finished Revision Error
a56d6cd1-f683-41b2-b18b-8d85afb9c4f7 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ unregister_netdevice: waiting for DEV to become free (9) 2026/05/18 11:45 2026/05/18 11:45 2026/05/18 12:38 55156e845761fb36809c4b3701a920dddce23332
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH net] net: neighbour: reject neighbor creation on IFF_NOARP devices 1 (1) 2026/05/15 15:05
[PATCH net v2] ipv6: addrconf: skip autoconf on unregistering devices 6 (6) 2026/05/14 13:39
[syzbot] [net?] unregister_netdevice: waiting for DEV to become free (9) 0 (9) 2026/05/14 11:58
▶ ▼ 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 2248d 2309d 15/29 fixed on 2020/04/15 17:19
upstream unregister_netdevice: waiting for DEV to become free (6) 2 C error 13128 1556d 1674d 20/29 fixed on 2022/03/08 16:11
upstream unregister_netdevice: waiting for DEV to become free 2 C 170521 2864d 2975d 8/29 fixed on 2018/08/08 18:10
linux-4.14 unregister_netdevice: waiting for DEV to become free 2 C done 120 2171d 2609d 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 10375 3h08m 1192d 0/3 upstream: reported C repro on 2023/03/07 22:57
android-49 unregister_netdevice: waiting for DEV to become free 2 C 52164 2391d 2618d 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 2453d 2618d 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 1192d 2128d 0/1 upstream: reported C repro on 2020/08/13 09:52
android-414 unregister_netdevice: waiting for DEV to become free 2 1231 2394d 2616d 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 1919d 2122d 19/29 fixed on 2021/03/10 01:48
linux-6.6 unregister_netdevice: waiting for DEV to become free origin:lts-only 2 C inconclusive 726 17h25m 358d 0/2 upstream: reported C repro on 2025/06/18 00:40
linux-6.1 unregister_netdevice: waiting for DEV to become free origin:upstream missing-backport 2 C inconclusive 5238 1h15m 1192d 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 36d 1097d 29/29 fixed on 2026/05/06 19:02
upstream unregister_netdevice: waiting for DEV to become free (2) 2 C done 385621 2309d 2857d 15/29 fixed on 2020/02/14 01:19
linux-4.19 unregister_netdevice: waiting for DEV to become free 2 C 5316 1192d 2619d 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 1674d 1919d 20/29 fixed on 2021/11/10 00:50
upstream unregister_netdevice: waiting for DEV to become free (7) 2 C inconclusive 20422 1099d 1301d 22/29 fixed on 2023/06/08 14:41
▶ ▼ Last patch testing requests (8)
Created Duration User Patch Repo Result
2026/05/14 11:58 28m raoxu@uniontech.com git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2026/05/14 11:12 29m raoxu@uniontech.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log
2026/05/14 08:24 27m raoxu@uniontech.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log
2026/05/14 06:48 16m raoxu@uniontech.com git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git main error
2026/05/14 04:02 1h14m raoxu@uniontech.com patch git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git main error
2026/05/14 02:36 7m raoxu@uniontech.com patch git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git main error
2026/05/14 02:08 8m raoxu@uniontech.com patch git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git main error
2026/05/14 01:51 7m raoxu@uniontech.com patch git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git main error

Sample crash report:
unregister_netdevice: waiting for netdevsim3 to become free. Usage count = 2

Crashes (1475):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/30 09:08 upstream 9215e74f228f 6b4a8443 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root unregister_netdevice: waiting for DEV to become free
2026/05/23 14:03 upstream 79bd2dded182 c69befb3 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream unregister_netdevice: waiting for DEV to become free
2026/05/30 12:12 net 78ef59e7a645 6b4a8443 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/05/21 04:45 net-next 0ae361f7e43c 41b8c833 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/06 22:22 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ffe7bef3786c cc095639 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 unregister_netdevice: waiting for DEV to become free
2026/06/06 09:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ffe7bef3786c cc095639 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 unregister_netdevice: waiting for DEV to become free
2026/05/31 15:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 4b4362973b6f 6b4a8443 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 unregister_netdevice: waiting for DEV to become free
2026/05/16 00:11 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5cbb61bf4168 81fb92f3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 unregister_netdevice: waiting for DEV to become free
2026/05/15 16:24 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5cbb61bf4168 9cd3beaa .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 unregister_netdevice: waiting for DEV to become free
2026/05/15 12:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5cbb61bf4168 9cd3beaa .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 unregister_netdevice: waiting for DEV to become free
2026/05/10 15:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5cbb61bf4168 29233ece .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-gce-arm64 unregister_netdevice: waiting for DEV to become free
2026/06/11 16:17 upstream 9716c086c8e8 d93a6ab6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 14:29 upstream 2d3090a8aeb5 c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 12:08 upstream 2d3090a8aeb5 c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root unregister_netdevice: waiting for DEV to become free
2026/06/09 08:40 upstream 2d3090a8aeb5 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs unregister_netdevice: waiting for DEV to become free
2026/06/08 15:53 upstream 4549871118cf 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root unregister_netdevice: waiting for DEV to become free
2026/06/08 11:32 upstream 4549871118cf cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root unregister_netdevice: waiting for DEV to become free
2026/06/04 18:19 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root unregister_netdevice: waiting for DEV to become free
2026/06/03 03:18 upstream ba3e43a9e601 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root unregister_netdevice: waiting for DEV to become free
2026/05/20 20:09 upstream 27fa82620cba 62fb93a2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root unregister_netdevice: waiting for DEV to become free
2026/06/10 22:45 upstream acb7500801e9 f79bac11 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 unregister_netdevice: waiting for DEV to become free
2026/06/11 03:36 upstream 9716c086c8e8 b754d2d8 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream unregister_netdevice: waiting for DEV to become free
2026/06/10 16:06 upstream acb7500801e9 f79bac11 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream unregister_netdevice: waiting for DEV to become free
2026/06/10 12:53 upstream acb7500801e9 f79bac11 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream unregister_netdevice: waiting for DEV to become free
2026/06/10 08:23 upstream 685441a6d3f1 34dab4be .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream unregister_netdevice: waiting for DEV to become free
2026/06/03 06:06 upstream ba3e43a9e601 3c0d2131 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 unregister_netdevice: waiting for DEV to become free
2026/06/11 21:02 net 7360b9609980 d93a6ab6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/11 15:07 net 7360b9609980 d93a6ab6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/11 14:05 net 7360b9609980 d93a6ab6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/11 10:52 net 512db8267b73 b754d2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/11 07:38 net 512db8267b73 b754d2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/11 02:36 net 512db8267b73 b754d2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/10 21:44 bpf e7ae89a0c97c f79bac11 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/10 17:54 net 627366c51145 f79bac11 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/10 16:15 net 627366c51145 f79bac11 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/10 14:07 net 627366c51145 f79bac11 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/10 09:48 net 0aa05daef784 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/10 06:12 net 0aa05daef784 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/10 02:16 net 0aa05daef784 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 19:57 net 09a5bf856aa7 c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 18:41 net 09a5bf856aa7 c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 17:28 net 09a5bf856aa7 c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 10:37 net 5d39580f68e6 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 07:14 net 5d39580f68e6 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 05:51 net 5d39580f68e6 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 04:41 net 5d39580f68e6 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 03:39 net 5d39580f68e6 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 02:03 net 5d39580f68e6 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/08 21:10 net 9772589b57e4 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/08 19:48 net 9772589b57e4 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/08 19:34 net 9772589b57e4 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/08 18:23 net 9772589b57e4 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/08 17:00 net 9772589b57e4 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/08 13:27 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/08 10:08 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/08 05:57 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/08 04:36 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/08 02:14 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/11 19:53 net-next 0ce346bf2f68 d93a6ab6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/11 04:38 net-next c8459ee2fef5 b754d2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/10 19:52 net-next 5855479abc79 f79bac11 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/10 04:02 net-next 3abbe3023144 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/09 21:14 net-next 193b76eb109e c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/05/16 19:37 linux-next e98d21c170b0 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root unregister_netdevice: waiting for DEV to become free
2026/05/08 15:18 linux-next e98d21c170b0 5633175a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce unregister_netdevice: waiting for DEV to become free
2026/06/11 12:33 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 596d152bc5e3 b754d2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 unregister_netdevice: waiting for DEV to become free
2026/06/10 00:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ffe7bef3786c 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 unregister_netdevice: waiting for DEV to become free
2026/06/08 03:22 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ffe7bef3786c cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 unregister_netdevice: waiting for DEV to become free
2026/06/09 09:06 https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux master 2d3090a8aeb5 656e94c6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64 unregister_netdevice: waiting for DEV to become free
2026/05/31 22:15 https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux master 174914ea5513 6b4a8443 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-compat unregister_netdevice: waiting for DEV to become free
* Struck through repros no longer work on HEAD.