From: Mirsad Goran Todorovac mirsad.todorovac@alu.unizg.hr Date: Tue, 14 Mar 2023 21:10:55 +0100
On 14. 03. 2023. 17:02, Eric Dumazet wrote:
On Tue, Mar 14, 2023 at 9:01 AM Mirsad Todorovac mirsad.todorovac@alu.unizg.hr wrote:
After a while, kernel message start looping:
kernel:unregister_netdevice: waiting for tap0 to become free. Usage count = 3
Message from syslogd@pc-mtodorov at Mar 14 16:57:15 ... kernel:unregister_netdevice: waiting for tap0 to become free. Usage count = 3
Message from syslogd@pc-mtodorov at Mar 14 16:57:24 ... kernel:unregister_netdevice: waiting for tap0 to become free. Usage count = 3
Message from syslogd@pc-mtodorov at Mar 14 16:57:26 ... kernel:unregister_netdevice: waiting for tap0 to become free. Usage count = 3
This hangs processes until very late stage of shutdown.
I can confirm that CONFIG_DEBUG_{KOBJECT,KOBJECT_RELEASE}=y were the only changes to .config in between builds.
KOBJECT_RELEASE delays freeing kobject with delayed_work.
In the failing tests, e.g. reattach_delete_close, we create a tun dev and do
1. detach (tun_detach()) 2. re-attach (tun_attach()) 3. close
. We release kobjects (tun->dev->(_tx|_rx).kobj) in 1. and recycle the same memory region in 2.
But the kobjects are not actually released due to the delay, thus netdev_queue_add_kobject() and rx_queue_add_kobject() fail.
---8<--- # RUN tun.reattach_delete_close ... [ 179.087589] kobject: 'tx-1' (00000000ee182e2f): kobject_release, parent 000000000643eb5f (delayed 3000) [ 179.088105] kobject: 'rx-1' (000000001c44852d): kobject_release, parent 000000000643eb5f (delayed 1000) [ 179.089097] kobject (00000000ee182e2f): tried to init an initialized object, something is seriously wrong. ---8<---
However, we don't assume the delay and also the failure in tun_set_real_num_queues().
In this case, we have to re-initialise the queues without touching kobjects.
Eric, Are you working on this? If not, let me try fixing this :)
Thanks, Kuniyuki
Best regards, Mirsad
Try adding in your config
CONFIG_NET_DEV_REFCNT_TRACKER=y CONFIG_NET_NS_REFCNT_TRACKER=y
Thanks.
Not at all.
According to the info here: https://cateee.net/lkddb/web-lkddb/NET_DEV_REFCNT_TRACKER.html no kerenel param was needed.
I have got the same hang, and additional debug information appears to be this (in /var/log/messages):
Mar 14 20:58:20 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:58:20 pc-mtodorov kernel: leaked reference. Mar 14 20:58:20 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:58:20 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:58:20 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:58:20 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:20 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:20 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:20 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:20 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:20 pc-mtodorov kernel: leaked reference. Mar 14 20:58:20 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:58:20 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:58:20 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:58:20 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:20 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:20 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:20 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:20 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:20 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:58:20 pc-mtodorov kernel: leaked reference. Mar 14 20:58:20 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:58:20 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:58:20 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:58:20 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:20 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:20 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:20 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:20 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:20 pc-mtodorov kernel: leaked reference. Mar 14 20:58:20 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:58:20 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:58:20 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:58:20 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:20 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:20 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:20 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:20 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:30 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:58:30 pc-mtodorov kernel: leaked reference. Mar 14 20:58:30 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:58:30 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:58:30 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:58:30 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:30 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:30 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:30 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:30 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:30 pc-mtodorov kernel: leaked reference. Mar 14 20:58:30 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:58:30 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:58:30 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:58:30 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:30 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:30 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:30 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:30 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:30 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:58:30 pc-mtodorov kernel: leaked reference. Mar 14 20:58:30 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:58:30 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:58:30 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:58:30 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:30 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:30 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:30 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:30 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:30 pc-mtodorov kernel: leaked reference. Mar 14 20:58:30 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:58:30 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:58:30 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:58:30 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:30 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:30 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:30 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:30 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:40 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:58:40 pc-mtodorov kernel: leaked reference. Mar 14 20:58:40 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:58:40 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:58:40 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:58:40 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:40 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:40 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:40 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:40 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:40 pc-mtodorov kernel: leaked reference. Mar 14 20:58:40 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:58:40 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:58:40 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:58:40 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:40 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:40 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:40 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:40 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:40 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:58:40 pc-mtodorov kernel: leaked reference. Mar 14 20:58:40 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:58:40 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:58:40 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:58:40 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:40 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:40 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:40 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:40 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:40 pc-mtodorov kernel: leaked reference. Mar 14 20:58:40 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:58:40 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:58:40 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:58:40 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:40 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:40 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:40 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:40 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:50 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:58:50 pc-mtodorov kernel: leaked reference. Mar 14 20:58:50 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:58:50 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:58:50 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:58:50 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:50 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:50 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:50 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:50 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:50 pc-mtodorov kernel: leaked reference. Mar 14 20:58:50 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:58:50 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:58:50 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:58:50 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:50 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:50 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:50 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:50 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:50 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:58:50 pc-mtodorov kernel: leaked reference. Mar 14 20:58:50 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:58:50 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:58:50 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:58:50 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:50 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:50 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:50 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:50 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:50 pc-mtodorov kernel: leaked reference. Mar 14 20:58:50 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:58:50 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:58:50 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:58:50 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:58:50 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:58:50 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:58:50 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:58:50 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:58:57 pc-mtodorov kernel: kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak) Mar 14 20:59:00 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:59:00 pc-mtodorov kernel: leaked reference. Mar 14 20:59:00 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:59:00 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:59:00 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:59:00 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:59:00 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:59:00 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:59:00 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:59:00 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:59:00 pc-mtodorov kernel: leaked reference. Mar 14 20:59:00 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:59:00 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:59:00 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:59:00 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:59:00 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:59:00 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:59:00 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:59:00 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:59:01 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:59:01 pc-mtodorov kernel: leaked reference. Mar 14 20:59:01 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:59:01 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:59:01 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:59:01 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:59:01 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:59:01 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:59:01 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:59:01 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:59:01 pc-mtodorov kernel: leaked reference. Mar 14 20:59:01 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:59:01 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:59:01 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:59:01 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:59:01 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:59:01 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:59:01 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:59:01 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:59:10 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:59:10 pc-mtodorov kernel: leaked reference. Mar 14 20:59:10 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:59:10 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:59:10 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:59:10 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:59:10 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:59:10 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:59:10 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:59:10 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:59:10 pc-mtodorov kernel: leaked reference. Mar 14 20:59:10 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:59:10 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:59:10 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:59:10 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:59:10 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:59:10 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:59:10 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:59:10 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:59:11 pc-mtodorov kernel: unregister_netdevice: waiting for tap0 to become free. Usage count = 3 Mar 14 20:59:11 pc-mtodorov kernel: leaked reference. Mar 14 20:59:11 pc-mtodorov kernel: net_rx_queue_update_kobjects+0x75/0x1d0 Mar 14 20:59:11 pc-mtodorov kernel: netif_set_real_num_rx_queues+0x5b/0xb0 Mar 14 20:59:11 pc-mtodorov kernel: tun_attach+0x1ec/0x5a0 Mar 14 20:59:11 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:59:11 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:59:11 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:59:11 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:59:11 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc Mar 14 20:59:11 pc-mtodorov kernel: leaked reference. Mar 14 20:59:11 pc-mtodorov kernel: netdev_queue_update_kobjects+0x86/0x190 Mar 14 20:59:11 pc-mtodorov kernel: netif_set_real_num_tx_queues+0x86/0x250 Mar 14 20:59:11 pc-mtodorov kernel: tun_attach+0x1d7/0x5a0 Mar 14 20:59:11 pc-mtodorov kernel: __tun_chr_ioctl+0xa58/0x17d0 Mar 14 20:59:11 pc-mtodorov kernel: tun_chr_ioctl+0x17/0x20 Mar 14 20:59:11 pc-mtodorov kernel: __x64_sys_ioctl+0x97/0xd0 Mar 14 20:59:11 pc-mtodorov kernel: do_syscall_64+0x5c/0x90 Mar 14 20:59:11 pc-mtodorov kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc [root@pc-mtodorov marvin]#
I see those "leaked reference" lines are being printed here: https://elixir.bootlin.com/linux/v6.3-rc2/source/lib/ref_tracker.c#L55
However, it is beyond the scope of my knowledge to track the actual leak.
Hope this helps.
Best regards, Mirsad
-- Mirsad Goran Todorovac Sistem inženjer Grafički fakultet | Akademija likovnih umjetnosti Sveučilište u Zagrebu System engineer Faculty of Graphic Arts | Academy of Fine Arts University of Zagreb, Republic of Croatia The European Union