[ 20.571716][ T256] ip (256) used greatest stack depth: 23920 bytes left [ 21.437977][ T261] ip (261) used greatest stack depth: 23696 bytes left [ 42.516519][ T71] ================================================================== [ 42.516810][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0 [ 42.517080][ T71] Read of size 1 at addr ffff888001fdc6ac by task kworker/u16:1/71 [ 42.517333][ T71] [ 42.517416][ T71] CPU: 2 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full) [ 42.517421][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 42.517423][ T71] Workqueue: netns cleanup_net [ 42.517431][ T71] Call Trace: [ 42.517433][ T71] [ 42.517437][ T71] dump_stack_lvl+0x82/0xc0 [ 42.517443][ T71] print_address_description.constprop.0+0x2c/0x3a0 [ 42.517451][ T71] ? kobject_put+0xbb/0xd0 [ 42.517456][ T71] print_report+0xb4/0x270 [ 42.517459][ T71] ? kobject_put+0xbb/0xd0 [ 42.517462][ T71] ? kasan_addr_to_slab+0x21/0x70 [ 42.517466][ T71] ? kobject_put+0xbb/0xd0 [ 42.517469][ T71] kasan_report+0xca/0x100 [ 42.517474][ T71] ? kobject_put+0xbb/0xd0 [ 42.517479][ T71] kobject_put+0xbb/0xd0 [ 42.517483][ T71] netdev_run_todo+0x5f0/0xc60 [ 42.517488][ T71] ? dev_ingress_queue_create+0x190/0x190 [ 42.517492][ T71] ? generic_xdp_install+0x410/0x410 [ 42.517499][ T71] ops_undo_list+0x714/0x890 [ 42.517506][ T71] ? netns_get+0x110/0x110 [ 42.517509][ T71] ? cleanup_net+0x2d6/0x830 [ 42.517514][ T71] cleanup_net+0x3b2/0x830 [ 42.517517][ T71] ? net_passive_dec+0x190/0x190 [ 42.517521][ T71] ? rcu_is_watching+0x12/0xb0 [ 42.517527][ T71] process_one_work+0xe35/0x1650 [ 42.517535][ T71] ? pwq_dec_nr_in_flight+0x550/0x550 [ 42.517540][ T71] ? assign_work+0x168/0x240 [ 42.517544][ T71] worker_thread+0x591/0xcf0 [ 42.517550][ T71] ? rescuer_thread+0xd10/0xd10 [ 42.517553][ T71] kthread+0x37b/0x5f0 [ 42.517557][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 42.517560][ T71] ? ret_from_fork+0x1b/0x270 [ 42.517565][ T71] ? __lock_release+0x5d/0x170 [ 42.517571][ T71] ? rcu_is_watching+0x12/0xb0 [ 42.517573][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 42.517577][ T71] ret_from_fork+0x1db/0x270 [ 42.517580][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 42.517583][ T71] ret_from_fork_asm+0x11/0x20 [ 42.517591][ T71] [ 42.517592][ T71] [ 42.523873][ T71] Allocated by task 250: [ 42.524000][ T71] kasan_save_stack+0x24/0x40 [ 42.524189][ T71] kasan_save_track+0x14/0x30 [ 42.524362][ T71] __kasan_kmalloc+0x7b/0x90 [ 42.524519][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0 [ 42.524673][ T71] alloc_netdev_mqs+0x7d/0x1370 [ 42.524834][ T71] sit_init_net+0x169/0x550 [ 42.524995][ T71] ops_init+0x189/0x550 [ 42.525156][ T71] setup_net+0xf1/0x380 [ 42.525285][ T71] copy_net_ns+0x21a/0x380 [ 42.525473][ T71] create_new_namespaces+0x35f/0x900 [ 42.525636][ T71] unshare_nsproxy_namespaces+0x89/0x120 [ 42.525791][ T71] ksys_unshare+0x2a3/0x660 [ 42.525950][ T71] __x64_sys_unshare+0x31/0x40 [ 42.526129][ T71] do_syscall_64+0xc1/0xfd0 [ 42.526296][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 42.526493][ T71] [ 42.526573][ T71] Freed by task 71: [ 42.526689][ T71] kasan_save_stack+0x24/0x40 [ 42.526860][ T71] kasan_save_track+0x14/0x30 [ 42.527032][ T71] __kasan_save_free_info+0x3b/0x60 [ 42.527234][ T71] __kasan_slab_free+0x3f/0x60 [ 42.527404][ T71] kfree+0x21d/0x540 [ 42.527524][ T71] device_release+0x9c/0x210 [ 42.527681][ T71] kobject_cleanup+0xfe/0x360 [ 42.527838][ T71] netdev_run_todo+0x81f/0xc60 [ 42.528003][ T71] ops_undo_list+0x714/0x890 [ 42.528195][ T71] cleanup_net+0x3b2/0x830 [ 42.528368][ T71] process_one_work+0xe35/0x1650 [ 42.528532][ T71] worker_thread+0x591/0xcf0 [ 42.528685][ T71] kthread+0x37b/0x5f0 [ 42.528803][ T71] ret_from_fork+0x1db/0x270 [ 42.528959][ T71] ret_from_fork_asm+0x11/0x20 [ 42.529145][ T71] [ 42.529233][ T71] The buggy address belongs to the object at ffff888001fdc000 [ 42.529233][ T71] which belongs to the cache kmalloc-4k of size 4096 [ 42.529635][ T71] The buggy address is located 1708 bytes inside of [ 42.529635][ T71] freed 4096-byte region [ffff888001fdc000, ffff888001fdd000) [ 42.530072][ T71] [ 42.530162][ T71] The buggy address belongs to the physical page: [ 42.530365][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fd8 [ 42.530647][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 42.530898][ T71] flags: 0x80000000000040(head|node=0|zone=1) [ 42.531131][ T71] page_type: f5(slab) [ 42.531262][ T71] raw: 0080000000000040 ffff888001043700 ffffea00001df610 ffffea0000225a10 [ 42.531546][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 42.531820][ T71] head: 0080000000000040 ffff888001043700 ffffea00001df610 ffffea0000225a10 [ 42.532144][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 42.532446][ T71] head: 0080000000000003 ffffea000007f601 00000000ffffffff 00000000ffffffff [ 42.532729][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 42.533032][ T71] page dumped because: kasan: bad access detected [ 42.533255][ T71] [ 42.533345][ T71] Memory state around the buggy address: [ 42.533502][ T71] ffff888001fdc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.533822][ T71] ffff888001fdc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.534080][ T71] >ffff888001fdc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.534335][ T71] ^ [ 42.534581][ T71] ffff888001fdc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.534818][ T71] ffff888001fdc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.535076][ T71] ================================================================== [ 42.535536][ T71] Disabling lock debugging due to kernel taint [ 42.535883][ T71] ------------[ cut here ]------------ [ 42.536121][ T71] refcount_t: underflow; use-after-free. [ 42.536398][ T71] WARNING: CPU: 1 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0 [ 42.536852][ T71] Modules linked in: nft_masq nft_chain_nat nf_nat nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth [ 42.537652][ T71] CPU: 1 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full) [ 42.538213][ T71] Tainted: [B]=BAD_PAGE [ 42.538392][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 42.538698][ T71] Workqueue: netns cleanup_net [ 42.538952][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0 [ 42.539257][ T71] Code: 83 90 02 80 fb 01 0f 87 95 6b d6 fe 83 e3 01 0f 85 51 ff ff ff c6 05 b1 83 90 02 01 90 48 c7 c7 a0 de a5 88 e8 c2 8b 15 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 f0 34 a1 ff e9 ba fe ff ff [ 42.540099][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282 [ 42.540397][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 42.540756][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001 [ 42.541109][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff127e220 [ 42.541465][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001 [ 42.541812][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100 [ 42.542155][ T71] FS: 0000000000000000(0000) GS:ffff8880aba6c000(0000) knlGS:0000000000000000 [ 42.542571][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.542873][ T71] CR2: 00000000004061e9 CR3: 0000000026d35004 CR4: 0000000000772ef0 [ 42.543223][ T71] PKRU: 55555554 [ 42.543558][ T71] Call Trace: [ 42.543728][ T71] [ 42.543870][ T71] netdev_run_todo+0x5f0/0xc60 [ 42.544113][ T71] ? dev_ingress_queue_create+0x190/0x190 [ 42.544341][ T71] ? generic_xdp_install+0x410/0x410 [ 42.544606][ T71] ops_undo_list+0x714/0x890 [ 42.544843][ T71] ? netns_get+0x110/0x110 [ 42.545071][ T71] ? cleanup_net+0x2d6/0x830 [ 42.545319][ T71] cleanup_net+0x3b2/0x830 [ 42.545708][ T71] ? net_passive_dec+0x190/0x190 [ 42.545947][ T71] ? rcu_is_watching+0x12/0xb0 [ 42.546183][ T71] process_one_work+0xe35/0x1650 [ 42.546421][ T71] ? pwq_dec_nr_in_flight+0x550/0x550 [ 42.546819][ T71] ? assign_work+0x168/0x240 [ 42.547057][ T71] worker_thread+0x591/0xcf0 [ 42.547291][ T71] ? rescuer_thread+0xd10/0xd10 [ 42.547534][ T71] kthread+0x37b/0x5f0 [ 42.547860][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 42.548092][ T71] ? ret_from_fork+0x1b/0x270 [ 42.548323][ T71] ? __lock_release+0x5d/0x170 [ 42.548566][ T71] ? rcu_is_watching+0x12/0xb0 [ 42.548953][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 42.549186][ T71] ret_from_fork+0x1db/0x270 [ 42.549415][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 42.549660][ T71] ret_from_fork_asm+0x11/0x20 [ 42.550040][ T71] [ 42.550233][ T71] irq event stamp: 10441 [ 42.550403][ T71] hardirqs last enabled at (10441): [] finish_task_switch.isra.0+0x245/0x960 [ 42.551029][ T71] hardirqs last disabled at (10440): [] __schedule+0x94a/0x1b10 [ 42.551450][ T71] softirqs last enabled at (10356): [] handle_softirqs+0x352/0x610 [ 42.551866][ T71] softirqs last disabled at (10349): [] irq_exit_rcu+0xab/0x100 [ 42.552401][ T71] ---[ end trace 0000000000000000 ]---