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AHgh+RqDBPkrnsEKo4oQX58jQ2KXRQS6dkF3QHp8pOOgMP7htbm+8uqi1ukZxSevCzSM0AfICQ27F6dA63zKCtc=@vger.kernel.org X-Gm-Message-State: AOJu0Yy1ygxZi/9ppK5jnm8xBRO9Onj40T0hssuzaX5dzRJ43gw5/lPc IEPugtPwC/rOA+fg7tX2gtc47IEtxvzpR40bwAeoOMM5dPd9E7TYBT8IrxEp/veD1PWnKO0xVRu tnLnqHM8UA8SqEtD4qFUPC2yHHyCpNeX2Rv4wUPps8f6ZmilP3at2sEof0ho= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:4446:b0:4a4:80be:3ae9 with SMTP id 5614622812f47-4ab354af89amr3538908b6e.28.1784883989531; Fri, 24 Jul 2026 02:06:29 -0700 (PDT) Date: Fri, 24 Jul 2026 02:06:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a632b15.dde6c935.cf6c8.0011.GAE@google.com> Subject: [syzbot] [net?] memory leak in udp_tunnel_nic_netdevice_event From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: dd3210c47e8d Merge tag 'regulator-fix-v7.2-rc2' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11b4f0b9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b80376788da8bcda dashboard link: https://syzkaller.appspot.com/bug?extid=eca845fb8c18dd6b44c1 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15b4f0b9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17e0d432580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5fb3ad85541d/disk-dd3210c4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/df0f959008a1/vmlinux-dd3210c4.xz kernel image: https://storage.googleapis.com/syzbot-assets/383375b1d360/bzImage-dd3210c4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+eca845fb8c18dd6b44c1@syzkaller.appspotmail.com 2026/07/12 04:07:42 executed programs: 5 BUG: memory leak unreferenced object 0xffff888127d5f840 (size 96): comm "syz-executor", pid 5806, jiffies 4294942188 hex dump (first 32 bytes): 00 00 00 01 00 00 00 00 48 f8 d5 27 81 88 ff ff ........H..'.... 48 f8 d5 27 81 88 ff ff 10 7d da 84 ff ff ff ff H..'.....}...... backtrace (crc 99fdb6c8): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4625 [inline] slab_alloc_node mm/slub.c:4945 [inline] __do_kmalloc_node mm/slub.c:5361 [inline] __kmalloc_noprof+0x3bf/0x550 mm/slub.c:5387 _kmalloc_noprof include/linux/slab.h:973 [inline] _kzalloc_noprof include/linux/slab.h:1290 [inline] udp_tunnel_nic_alloc net/ipv4/udp_tunnel_nic.c:756 [inline] udp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:833 [inline] udp_tunnel_nic_netdevice_event+0x804/0xab0 net/ipv4/udp_tunnel_nic.c:931 notifier_call_chain+0x59/0x160 kernel/notifier.c:85 call_netdevice_notifiers_info+0x7d/0xb0 net/core/dev.c:2250 call_netdevice_notifiers_extack net/core/dev.c:2288 [inline] call_netdevice_notifiers net/core/dev.c:2302 [inline] register_netdevice+0xc10/0xeb0 net/core/dev.c:11478 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1070 [inline] nsim_create+0x424/0x5b0 drivers/net/netdevsim/netdev.c:1152 __nsim_dev_port_add+0x266/0x450 drivers/net/netdevsim/dev.c:1509 nsim_dev_port_add_all drivers/net/netdevsim/dev.c:1570 [inline] nsim_drv_probe+0x79c/0x930 drivers/net/netdevsim/dev.c:1731 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x12f/0x3a0 drivers/base/dd.c:706 __driver_probe_device+0xe9/0x1a0 drivers/base/dd.c:868 driver_probe_device+0x28/0xf0 drivers/base/dd.c:898 __device_attach_driver+0x10f/0x170 drivers/base/dd.c:1026 bus_for_each_drv+0xd2/0x130 drivers/base/bus.c:500 __device_attach+0xf9/0x290 drivers/base/dd.c:1098 device_initial_probe+0x6f/0x80 drivers/base/dd.c:1153 bus_probe_device+0x3e/0xb0 drivers/base/bus.c:620 connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup