[ 12.498526][ T11] ================================================================== [ 12.498845][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 12.499051][ T11] Read of size 8 at addr ffff88800a4f80f8 by task kworker/u16:0/11 [ 12.499245][ T11] [ 12.499316][ T11] CPU: 1 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 12.499519][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.499710][ T11] Workqueue: netns cleanup_net [ 12.499860][ T11] Call Trace: [ 12.499961][ T11] [ 12.500033][ T11] dump_stack_lvl+0x82/0xd0 [ 12.500180][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 12.500347][ T11] ? cleanup_net+0xa5d/0xb90 [ 12.500481][ T11] print_report+0xb4/0x270 [ 12.500616][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 12.500747][ T11] kasan_report+0xbd/0xf0 [ 12.500848][ T11] ? cleanup_net+0xa5d/0xb90 [ 12.500980][ T11] cleanup_net+0xa5d/0xb90 [ 12.501118][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 12.501261][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 12.501393][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 12.501526][ T11] ? lock_acquire+0x32/0xc0 [ 12.501658][ T11] ? process_one_work+0xe0b/0x16d0 [ 12.501793][ T11] process_one_work+0xe55/0x16d0 [ 12.501928][ T11] ? __pfx___lock_release+0x10/0x10 [ 12.502060][ T11] ? __pfx_process_one_work+0x10/0x10 [ 12.502194][ T11] ? assign_work+0x16c/0x240 [ 12.502325][ T11] worker_thread+0x58c/0xce0 [ 12.502459][ T11] ? __pfx_worker_thread+0x10/0x10 [ 12.502594][ T11] kthread+0x28a/0x350 [ 12.502697][ T11] ? __pfx_kthread+0x10/0x10 [ 12.502830][ T11] ret_from_fork+0x31/0x70 [ 12.502967][ T11] ? __pfx_kthread+0x10/0x10 [ 12.503098][ T11] ret_from_fork_asm+0x1a/0x30 [ 12.503237][ T11] [ 12.503338][ T11] [ 12.503410][ T11] Allocated by task 252: [ 12.503511][ T11] kasan_save_stack+0x24/0x50 [ 12.503649][ T11] kasan_save_track+0x14/0x30 [ 12.503782][ T11] __kasan_slab_alloc+0x59/0x70 [ 12.503920][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 12.504059][ T11] copy_net_ns+0xc6/0x540 [ 12.504159][ T11] create_new_namespaces+0x35f/0x920 [ 12.504292][ T11] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 12.504426][ T11] ksys_unshare+0x2c4/0x6e0 [ 12.504572][ T11] __x64_sys_unshare+0x31/0x40 [ 12.504704][ T11] do_syscall_64+0xc1/0x1d0 [ 12.504840][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.505009][ T11] [ 12.505076][ T11] Freed by task 11: [ 12.505182][ T11] kasan_save_stack+0x24/0x50 [ 12.505317][ T11] kasan_save_track+0x14/0x30 [ 12.505448][ T11] kasan_save_free_info+0x3b/0x60 [ 12.505580][ T11] __kasan_slab_free+0x38/0x50 [ 12.505710][ T11] kmem_cache_free+0xf8/0x330 [ 12.505850][ T11] cleanup_net+0x5a8/0xb90 [ 12.505984][ T11] process_one_work+0xe55/0x16d0 [ 12.506115][ T11] worker_thread+0x58c/0xce0 [ 12.506247][ T11] kthread+0x28a/0x350 [ 12.506345][ T11] ret_from_fork+0x31/0x70 [ 12.506480][ T11] ret_from_fork_asm+0x1a/0x30 [ 12.506609][ T11] [ 12.506678][ T11] Last potentially related work creation: [ 12.506824][ T11] kasan_save_stack+0x24/0x50 [ 12.506959][ T11] __kasan_record_aux_stack+0x8e/0xa0 [ 12.507100][ T11] insert_work+0x34/0x230 [ 12.507204][ T11] __queue_work+0x5fd/0xa40 [ 12.507336][ T11] queue_delayed_work_on+0x8c/0xa0 [ 12.507474][ T11] __inet_insert_ifa+0x751/0xb10 [ 12.507611][ T11] inetdev_event+0xb18/0xcf0 [ 12.507749][ T11] notifier_call_chain+0xcd/0x150 [ 12.507883][ T11] __dev_notify_flags+0xe6/0x250 [ 12.508020][ T11] dev_change_flags+0xec/0x160 [ 12.508158][ T11] do_setlink.constprop.0+0x79d/0x2300 [ 12.508295][ T11] rtnl_newlink+0x6de/0xa80 [ 12.508431][ T11] rtnetlink_rcv_msg+0x712/0xc10 [ 12.508571][ T11] netlink_rcv_skb+0x130/0x360 [ 12.508710][ T11] netlink_unicast+0x44b/0x710 [ 12.508846][ T11] netlink_sendmsg+0x723/0xbe0 [ 12.508986][ T11] ____sys_sendmsg+0x7ac/0xa10 [ 12.509123][ T11] ___sys_sendmsg+0xee/0x170 [ 12.509265][ T11] __sys_sendmsg+0x109/0x1a0 [ 12.509415][ T11] do_syscall_64+0xc1/0x1d0 [ 12.509552][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.509721][ T11] [ 12.509791][ T11] The buggy address belongs to the object at ffff88800a4f8040 [ 12.509791][ T11] which belongs to the cache net_namespace of size 6528 [ 12.510148][ T11] The buggy address is located 184 bytes inside of [ 12.510148][ T11] freed 6528-byte region [ffff88800a4f8040, ffff88800a4f99c0) [ 12.510472][ T11] [ 12.510542][ T11] The buggy address belongs to the physical page: [ 12.510713][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a4fb640 pfn:0xa4f8 [ 12.510985][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 12.511188][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 12.511367][ T11] page_type: f5(slab) [ 12.511478][ T11] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 12.511723][ T11] raw: ffff88800a4fb640 0000000000040002 00000001f5000000 0000000000000000 [ 12.511967][ T11] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 12.512214][ T11] head: ffff88800a4fb640 0000000000040002 00000001f5000000 0000000000000000 [ 12.512460][ T11] head: 0080000000000003 ffffea0000293e01 ffffffffffffffff 0000000000000000 [ 12.512707][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 12.512945][ T11] page dumped because: kasan: bad access detected [ 12.513114][ T11] [ 12.513187][ T11] Memory state around the buggy address: [ 12.513324][ T11] ffff88800a4f7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.513521][ T11] ffff88800a4f8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 12.513718][ T11] >ffff88800a4f8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.513919][ T11] ^ [ 12.514118][ T11] ffff88800a4f8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.514308][ T11] ffff88800a4f8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.514499][ T11] ================================================================== [ 12.515038][ T11] Disabling lock debugging due to kernel taint