------------[ cut here ]------------ ODEBUG: free active (active state 0) object: 00000000aff742c5 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: 00000000aff742c5 object type: timer_list hint: atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:177 [inline] ODEBUG: free active (active state 0) object: 00000000aff742c5 object type: timer_list hint: __refcount_sub_and_test include/linux/refcount.h:272 [inline] ODEBUG: free active (active state 0) object: 00000000aff742c5 object type: timer_list hint: __refcount_dec_and_test include/linux/refcount.h:315 [inline] ODEBUG: free active (active state 0) object: 00000000aff742c5 object type: timer_list hint: refcount_dec_and_test include/linux/refcount.h:333 [inline] ODEBUG: free active (active state 0) object: 00000000aff742c5 object type: timer_list hint: kref_put include/linux/kref.h:64 [inline] ODEBUG: free active (active state 0) object: 00000000aff742c5 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: 00000000aff742c5 object type: timer_list hint: batadv_dat_purge+0x0/0x284 net/batman-adv/distributed-arp-table.c:1829 WARNING: CPU: 0 PID: 4543 at lib/debugobjects.c:512 debug_print_object lib/debugobjects.c:509 [inline] WARNING: CPU: 0 PID: 4543 at lib/debugobjects.c:512 __debug_check_no_obj_freed lib/debugobjects.c:996 [inline] WARNING: CPU: 0 PID: 4543 at lib/debugobjects.c:512 debug_check_no_obj_freed+0x210/0x2ac lib/debugobjects.c:1027 Modules linked in: CPU: 0 PID: 4543 Comm: kworker/u4:6 Not tainted 6.2.0-rc3-syzkaller-16387-g9598c377d828 #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 : ffff800013d739b0 x29: ffff800013d739d0 x28: ffff0000f39ed000 x27: ffff0000f39ee000 x26: ffff80000c15f8a0 x25: ffff0000f3aa9b90 x24: ffff80000f2e4000 x23: ffff0000f39ed4f8 x22: ffff80000c15f8a0 x21: 0000000000000001 x20: dead000000000100 x19: ffff0000f39ec000 x18: 00000000000000c0 x17: 626f203563323437 x16: ffff80000dd86118 x15: ffff0000f5a2b400 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000f5a2b400 x11: ff808000081cbbc8 x10: 0000000000000000 x9 : fe420f73acf8c900 x8 : fe420f73acf8c900 x7 : ffff80000c11ee8c 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: 12979890 hardirqs last enabled at (12979889): [] __up_console_sem+0xb0/0xfc kernel/printk/printk.c:344 hardirqs last disabled at (12979890): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (12979822): [] spin_unlock_bh include/linux/spinlock.h:395 [inline] softirqs last enabled at (12979822): [] batadv_tvlv_handler_unregister+0xec/0x1d8 net/batman-adv/tvlv.c:575 softirqs last disabled at (12979820): [] spin_lock_bh include/linux/spinlock.h:355 [inline] softirqs last disabled at (12979820): [] batadv_tvlv_handler_unregister+0xbc/0x1d8 net/batman-adv/tvlv.c:573 ---[ end trace 0000000000000000 ]---