------------[ cut here ]------------ ODEBUG: free active (active state 0) object: 000000006b5c129c object type: timer_list hint: arch_atomic_fetch_sub_release arch/arm64/include/asm/atomic.h:51 [inline] ODEBUG: free active (active state 0) object: 000000006b5c129c object type: timer_list hint: atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:177 [inline] ODEBUG: free active (active state 0) object: 000000006b5c129c object type: timer_list hint: __refcount_sub_and_test include/linux/refcount.h:272 [inline] ODEBUG: free active (active state 0) object: 000000006b5c129c object type: timer_list hint: __refcount_dec_and_test include/linux/refcount.h:315 [inline] ODEBUG: free active (active state 0) object: 000000006b5c129c object type: timer_list hint: refcount_dec_and_test include/linux/refcount.h:333 [inline] ODEBUG: free active (active state 0) object: 000000006b5c129c object type: timer_list hint: kref_put include/linux/kref.h:64 [inline] ODEBUG: free active (active state 0) object: 000000006b5c129c object type: timer_list hint: batadv_dat_entry_put net/batman-adv/distributed-arp-table.c:133 [inline] ODEBUG: free active (active state 0) object: 000000006b5c129c object type: timer_list hint: batadv_dat_purge+0x0/0x284 net/batman-adv/distributed-arp-table.c:1829 WARNING: CPU: 0 PID: 4509 at lib/debugobjects.c:512 debug_print_object lib/debugobjects.c:509 [inline] WARNING: CPU: 0 PID: 4509 at lib/debugobjects.c:512 __debug_check_no_obj_freed lib/debugobjects.c:996 [inline] WARNING: CPU: 0 PID: 4509 at lib/debugobjects.c:512 debug_check_no_obj_freed+0x210/0x2ac lib/debugobjects.c:1027 Modules linked in: CPU: 0 PID: 4509 Comm: kworker/u4:5 Not tainted 6.2.0-rc2-syzkaller-16046-gae87308093bc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: netns cleanup_net pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:509 [inline] pc : __debug_check_no_obj_freed lib/debugobjects.c:996 [inline] pc : debug_check_no_obj_freed+0x210/0x2ac lib/debugobjects.c:1027 lr : debug_print_object lib/debugobjects.c:509 [inline] lr : __debug_check_no_obj_freed lib/debugobjects.c:996 [inline] lr : debug_check_no_obj_freed+0x210/0x2ac lib/debugobjects.c:1027 sp : ffff800013b639b0 x29: ffff800013b639d0 x28: ffff00011a3b1000 x27: ffff00011a3b2000 x26: ffff80000c15f8a0 x25: ffff000119a02280 x24: ffff80000f2d4000 x23: ffff00011a3b14f8 x22: ffff80000c15f8a0 x21: 0000000000000001 x20: dead000000000100 x19: ffff00011a3b0000 x18: 0000000000000094 x17: 626f206339323163 x16: ffff80000dd76118 x15: ffff00011781ce00 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff00011781ce00 x11: ff808000081cbbc8 x10: 0000000000000000 x9 : b9f2b9afe1c84d00 x8 : b9f2b9afe1c84d00 x7 : ffff80000c121738 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000076 Call trace: debug_print_object lib/debugobjects.c:509 [inline] __debug_check_no_obj_freed lib/debugobjects.c:996 [inline] debug_check_no_obj_freed+0x210/0x2ac lib/debugobjects.c:1027 slab_free_hook mm/slub.c:1756 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x12c/0x314 mm/slub.c:3800 kfree+0x9c/0x118 mm/slab_common.c:1020 kvfree+0x40/0x50 mm/util.c:627 netdev_freemem+0x24/0x34 net/core/dev.c:10540 netdev_release+0x48/0x60 net/core/net-sysfs.c:1910 device_release+0x44/0xe0 kobject_cleanup+0xe8/0x280 lib/kobject.c:673 kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x94/0xf8 lib/kobject.c:721 netdev_run_todo+0x650/0x6f0 net/core/dev.c:10360 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:148 default_device_exit_batch+0x3cc/0x42c net/core/dev.c:11349 ops_exit_list net/core/net_namespace.c:174 [inline] cleanup_net+0x3cc/0x650 net/core/net_namespace.c:606 process_one_work+0x2d8/0x504 kernel/workqueue.c:2289 worker_thread+0x340/0x610 kernel/workqueue.c:2436 kthread+0x12c/0x158 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:863 irq event stamp: 19784740 hardirqs last enabled at (19784739): [] __up_console_sem+0xb0/0xfc kernel/printk/printk.c:344 hardirqs last disabled at (19784740): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (19784648): [] spin_unlock_bh include/linux/spinlock.h:395 [inline] softirqs last enabled at (19784648): [] batadv_tvlv_handler_unregister+0xec/0x1d8 net/batman-adv/tvlv.c:575 softirqs last disabled at (19784646): [] spin_lock_bh include/linux/spinlock.h:355 [inline] softirqs last disabled at (19784646): [] batadv_tvlv_handler_unregister+0xbc/0x1d8 net/batman-adv/tvlv.c:573 ---[ end trace 0000000000000000 ]---