[ 15.675249][ T269] ip (269) used greatest stack depth: 24576 bytes left [ 17.831656][ T12] ================================================================== [ 17.832026][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0 [ 17.832281][ T12] Read of size 1 at addr ffff8880086296c4 by task kworker/u16:0/12 [ 17.832513][ T12] [ 17.832595][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full) [ 17.832600][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.832603][ T12] Workqueue: netns cleanup_net [ 17.832613][ T12] Call Trace: [ 17.832615][ T12] [ 17.832618][ T12] dump_stack_lvl+0x82/0xc0 [ 17.832624][ T12] print_address_description.constprop.0+0x2c/0x3a0 [ 17.832632][ T12] ? kobject_put+0xbb/0xd0 [ 17.832636][ T12] print_report+0xb4/0x270 [ 17.832639][ T12] ? kobject_put+0xbb/0xd0 [ 17.832642][ T12] ? kasan_addr_to_slab+0x21/0x70 [ 17.832646][ T12] ? kobject_put+0xbb/0xd0 [ 17.832649][ T12] kasan_report+0xca/0x100 [ 17.832653][ T12] ? kobject_put+0xbb/0xd0 [ 17.832658][ T12] kobject_put+0xbb/0xd0 [ 17.832662][ T12] netdev_run_todo+0x5f0/0xc60 [ 17.832668][ T12] ? dev_ingress_queue_create+0x190/0x190 [ 17.832672][ T12] ? generic_xdp_install+0x410/0x410 [ 17.832675][ T12] ? net_generic+0xb1/0x1f0 [ 17.832685][ T12] ops_undo_list+0x714/0x890 [ 17.832690][ T12] ? rtnl_net_dumpid_one+0x270/0x270 [ 17.832694][ T12] ? cleanup_net+0x2d6/0x8b0 [ 17.832700][ T12] cleanup_net+0x3b2/0x8b0 [ 17.832704][ T12] ? net_passive_dec+0x190/0x190 [ 17.832708][ T12] ? rcu_is_watching+0x12/0xb0 [ 17.832716][ T12] process_one_work+0xe35/0x1650 [ 17.832727][ T12] ? pwq_dec_nr_in_flight+0x550/0x550 [ 17.832732][ T12] ? assign_work+0x168/0x240 [ 17.832737][ T12] worker_thread+0x591/0xcf0 [ 17.832743][ T12] ? rescuer_thread+0xd10/0xd10 [ 17.832746][ T12] kthread+0x37b/0x5f0 [ 17.832751][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.832753][ T12] ? ret_from_fork+0x1b/0x270 [ 17.832759][ T12] ? __lock_release+0x5d/0x170 [ 17.832764][ T12] ? rcu_is_watching+0x12/0xb0 [ 17.832767][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.832771][ T12] ret_from_fork+0x1db/0x270 [ 17.832773][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.832776][ T12] ret_from_fork_asm+0x11/0x20 [ 17.832786][ T12] [ 17.832787][ T12] [ 17.838782][ T12] Allocated by task 263: [ 17.838905][ T12] kasan_save_stack+0x24/0x40 [ 17.839068][ T12] kasan_save_track+0x14/0x30 [ 17.839228][ T12] __kasan_kmalloc+0x7b/0x90 [ 17.839392][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0 [ 17.839546][ T12] alloc_netdev_mqs+0x7d/0x1370 [ 17.839706][ T12] ip6_tnl_init_net+0x102/0x3f0 [ 17.839863][ T12] ops_init+0x189/0x550 [ 17.839980][ T12] setup_net+0xf1/0x380 [ 17.840096][ T12] copy_net_ns+0x253/0x510 [ 17.840262][ T12] create_new_namespaces+0x35f/0x900 [ 17.840419][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0 [ 17.840575][ T12] ksys_unshare+0x2be/0x6e0 [ 17.840735][ T12] __x64_sys_unshare+0x31/0x40 [ 17.840890][ T12] do_syscall_64+0xc1/0xfd0 [ 17.841046][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.841240][ T12] [ 17.841333][ T12] Freed by task 12: [ 17.841534][ T12] kasan_save_stack+0x24/0x40 [ 17.841690][ T12] kasan_save_track+0x14/0x30 [ 17.841845][ T12] __kasan_save_free_info+0x3b/0x60 [ 17.841998][ T12] __kasan_slab_free+0x3f/0x60 [ 17.842149][ T12] kfree+0x21d/0x540 [ 17.842276][ T12] device_release+0x9c/0x210 [ 17.842433][ T12] kobject_cleanup+0xfe/0x360 [ 17.842586][ T12] netdev_run_todo+0x81f/0xc60 [ 17.842829][ T12] ops_undo_list+0x714/0x890 [ 17.842981][ T12] cleanup_net+0x3b2/0x8b0 [ 17.843136][ T12] process_one_work+0xe35/0x1650 [ 17.843298][ T12] worker_thread+0x591/0xcf0 [ 17.843536][ T12] kthread+0x37b/0x5f0 [ 17.843652][ T12] ret_from_fork+0x1db/0x270 [ 17.843806][ T12] ret_from_fork_asm+0x11/0x20 [ 17.843967][ T12] [ 17.844050][ T12] The buggy address belongs to the object at ffff888008629000 [ 17.844050][ T12] which belongs to the cache kmalloc-4k of size 4096 [ 17.844416][ T12] The buggy address is located 1732 bytes inside of [ 17.844416][ T12] freed 4096-byte region [ffff888008629000, ffff88800862a000) [ 17.844782][ T12] [ 17.844865][ T12] The buggy address belongs to the physical page: [ 17.845059][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8628 [ 17.845339][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 17.845575][ T12] flags: 0x80000000000040(head|node=0|zone=1) [ 17.845770][ T12] page_type: f5(slab) [ 17.845890][ T12] raw: 0080000000000040 ffff888001043700 ffffea000020be10 ffffea00001e3c10 [ 17.846279][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 17.846552][ T12] head: 0080000000000040 ffff888001043700 ffffea000020be10 ffffea00001e3c10 [ 17.846917][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 17.847192][ T12] head: 0080000000000003 ffffea0000218a01 00000000ffffffff 00000000ffffffff [ 17.847469][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 17.847738][ T12] page dumped because: kasan: bad access detected [ 17.847939][ T12] [ 17.848015][ T12] Memory state around the buggy address: [ 17.848266][ T12] ffff888008629580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.848499][ T12] ffff888008629600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.848713][ T12] >ffff888008629680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.849015][ T12] ^ [ 17.849202][ T12] ffff888008629700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.849505][ T12] ffff888008629780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.849727][ T12] ================================================================== [ 17.850038][ T12] Disabling lock debugging due to kernel taint [ 17.850259][ T12] ------------[ cut here ]------------ [ 17.850423][ T12] refcount_t: underflow; use-after-free. [ 17.850623][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0 [ 17.851035][ T12] Modules linked in: [ 17.851179][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full) [ 17.851547][ T12] Tainted: [B]=BAD_PAGE [ 17.851692][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.851904][ T12] Workqueue: netns cleanup_net [ 17.852107][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0 [ 17.852334][ T12] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba 65 9c e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff [ 17.852893][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282 [ 17.853113][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 17.853369][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001 [ 17.853623][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3ac0934 [ 17.853870][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001 [ 17.854222][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100 [ 17.854562][ T12] FS: 0000000000000000(0000) GS:ffff8880ce608000(0000) knlGS:0000000000000000 [ 17.854937][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 17.855160][ T12] CR2: 000055f1ce33e928 CR3: 0000000012149004 CR4: 0000000000772ef0 [ 17.855412][ T12] PKRU: 55555554 [ 17.855554][ T12] Call Trace: [ 17.855690][ T12] [ 17.855883][ T12] netdev_run_todo+0x5f0/0xc60 [ 17.856074][ T12] ? dev_ingress_queue_create+0x190/0x190 [ 17.856263][ T12] ? generic_xdp_install+0x410/0x410 [ 17.856522][ T12] ? net_generic+0xb1/0x1f0 [ 17.856700][ T12] ops_undo_list+0x714/0x890 [ 17.856875][ T12] ? rtnl_net_dumpid_one+0x270/0x270 [ 17.857053][ T12] ? cleanup_net+0x2d6/0x8b0 [ 17.857408][ T12] cleanup_net+0x3b2/0x8b0 [ 17.857584][ T12] ? net_passive_dec+0x190/0x190 [ 17.857756][ T12] ? rcu_is_watching+0x12/0xb0 [ 17.857951][ T12] process_one_work+0xe35/0x1650 [ 17.858152][ T12] ? pwq_dec_nr_in_flight+0x550/0x550 [ 17.858333][ T12] ? assign_work+0x168/0x240 [ 17.858505][ T12] worker_thread+0x591/0xcf0 [ 17.858678][ T12] ? rescuer_thread+0xd10/0xd10 [ 17.858942][ T12] kthread+0x37b/0x5f0 [ 17.859086][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.859261][ T12] ? ret_from_fork+0x1b/0x270 [ 17.859435][ T12] ? __lock_release+0x5d/0x170 [ 17.859609][ T12] ? rcu_is_watching+0x12/0xb0 [ 17.859777][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.859948][ T12] ret_from_fork+0x1db/0x270 [ 17.860127][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.860388][ T12] ret_from_fork_asm+0x11/0x20 [ 17.860588][ T12] [ 17.860740][ T12] irq event stamp: 9815 [ 17.860875][ T12] hardirqs last enabled at (9815): [] irqentry_exit+0x3b/0x80 [ 17.861177][ T12] hardirqs last disabled at (9814): [] handle_softirqs+0x47f/0x610 [ 17.861465][ T12] softirqs last enabled at (9496): [] handle_softirqs+0x352/0x610 [ 17.861750][ T12] softirqs last disabled at (9485): [] irq_exit_rcu+0xab/0x100 [ 17.862038][ T12] ---[ end trace 0000000000000000 ]---