[ 26.081988][ T11] ================================================================== [ 26.082293][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 26.082491][ T11] Read of size 8 at addr ffff88800d2400f8 by task kworker/u16:0/11 [ 26.082671][ T11] [ 26.082737][ T11] CPU: 3 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 26.082925][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 26.083082][ T11] Workqueue: netns cleanup_net [ 26.083213][ T11] Call Trace: [ 26.083306][ T11] [ 26.083374][ T11] dump_stack_lvl+0x82/0xd0 [ 26.083505][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 26.083668][ T11] ? cleanup_net+0xa5d/0xb90 [ 26.083793][ T11] print_report+0xb4/0x270 [ 26.083916][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 26.084039][ T11] kasan_report+0xbd/0xf0 [ 26.084135][ T11] ? cleanup_net+0xa5d/0xb90 [ 26.084261][ T11] cleanup_net+0xa5d/0xb90 [ 26.084384][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 26.084514][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 26.084645][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 26.084771][ T11] ? lock_acquire+0x32/0xc0 [ 26.084893][ T11] ? process_one_work+0xe0b/0x16d0 [ 26.085023][ T11] process_one_work+0xe55/0x16d0 [ 26.085149][ T11] ? __pfx___lock_release+0x10/0x10 [ 26.085274][ T11] ? __pfx_process_one_work+0x10/0x10 [ 26.085403][ T11] ? assign_work+0x16c/0x240 [ 26.085527][ T11] worker_thread+0x58c/0xce0 [ 26.085653][ T11] ? __pfx_worker_thread+0x10/0x10 [ 26.085778][ T11] kthread+0x28a/0x350 [ 26.085876][ T11] ? __pfx_kthread+0x10/0x10 [ 26.085999][ T11] ret_from_fork+0x31/0x70 [ 26.086123][ T11] ? __pfx_kthread+0x10/0x10 [ 26.086245][ T11] ret_from_fork_asm+0x1a/0x30 [ 26.086375][ T11] [ 26.086480][ T11] [ 26.086546][ T11] Allocated by task 256: [ 26.086643][ T11] kasan_save_stack+0x24/0x50 [ 26.086770][ T11] kasan_save_track+0x14/0x30 [ 26.086891][ T11] __kasan_slab_alloc+0x59/0x70 [ 26.087012][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 26.087140][ T11] copy_net_ns+0xc6/0x540 [ 26.087235][ T11] create_new_namespaces+0x35f/0x920 [ 26.087360][ T11] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 26.087483][ T11] ksys_unshare+0x2c4/0x6e0 [ 26.087610][ T11] __x64_sys_unshare+0x31/0x40 [ 26.087731][ T11] do_syscall_64+0xc1/0x1d0 [ 26.087859][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 26.088017][ T11] [ 26.088081][ T11] Freed by task 11: [ 26.088176][ T11] kasan_save_stack+0x24/0x50 [ 26.088302][ T11] kasan_save_track+0x14/0x30 [ 26.088423][ T11] kasan_save_free_info+0x3b/0x60 [ 26.088547][ T11] __kasan_slab_free+0x38/0x50 [ 26.088668][ T11] kmem_cache_free+0xf8/0x330 [ 26.088788][ T11] cleanup_net+0x5a8/0xb90 [ 26.088911][ T11] process_one_work+0xe55/0x16d0 [ 26.089033][ T11] worker_thread+0x58c/0xce0 [ 26.089156][ T11] kthread+0x28a/0x350 [ 26.089248][ T11] ret_from_fork+0x31/0x70 [ 26.089369][ T11] ret_from_fork_asm+0x1a/0x30 [ 26.089492][ T11] [ 26.089557][ T11] Last potentially related work creation: [ 26.089681][ T11] kasan_save_stack+0x24/0x50 [ 26.089807][ T11] __kasan_record_aux_stack+0x8e/0xa0 [ 26.089934][ T11] insert_work+0x34/0x230 [ 26.090028][ T11] __queue_work+0x5fd/0xa40 [ 26.090151][ T11] queue_delayed_work_on+0x8c/0xa0 [ 26.090277][ T11] __inet_insert_ifa+0x751/0xb10 [ 26.090406][ T11] inetdev_event+0xb18/0xcf0 [ 26.090532][ T11] notifier_call_chain+0xcd/0x150 [ 26.090655][ T11] __dev_notify_flags+0xe6/0x250 [ 26.090782][ T11] dev_change_flags+0xec/0x160 [ 26.090905][ T11] do_setlink.constprop.0+0x79d/0x2300 [ 26.091031][ T11] rtnl_newlink+0x6de/0xa80 [ 26.091156][ T11] rtnetlink_rcv_msg+0x712/0xc10 [ 26.091281][ T11] netlink_rcv_skb+0x130/0x360 [ 26.091410][ T11] netlink_unicast+0x44b/0x710 [ 26.091535][ T11] netlink_sendmsg+0x723/0xbe0 [ 26.091660][ T11] ____sys_sendmsg+0x7ac/0xa10 [ 26.091785][ T11] ___sys_sendmsg+0xee/0x170 [ 26.091908][ T11] __sys_sendmsg+0x109/0x1a0 [ 26.092036][ T11] do_syscall_64+0xc1/0x1d0 [ 26.092160][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 26.092314][ T11] [ 26.092378][ T11] The buggy address belongs to the object at ffff88800d240040 [ 26.092378][ T11] which belongs to the cache net_namespace of size 6528 [ 26.092706][ T11] The buggy address is located 184 bytes inside of [ 26.092706][ T11] freed 6528-byte region [ffff88800d240040, ffff88800d2419c0) [ 26.093001][ T11] [ 26.093068][ T11] The buggy address belongs to the physical page: [ 26.093221][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800d243640 pfn:0xd240 [ 26.093468][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 26.093658][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 26.093822][ T11] page_type: f5(slab) [ 26.093921][ T11] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 26.094143][ T11] raw: ffff88800d243640 0000000000040002 00000001f5000000 0000000000000000 [ 26.094361][ T11] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 26.094587][ T11] head: ffff88800d243640 0000000000040002 00000001f5000000 0000000000000000 [ 26.094805][ T11] head: 0080000000000003 ffffea0000349001 ffffffffffffffff 0000000000000000 [ 26.095022][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 26.095240][ T11] page dumped because: kasan: bad access detected [ 26.095392][ T11] [ 26.095454][ T11] Memory state around the buggy address: [ 26.095575][ T11] ffff88800d23ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 26.095760][ T11] ffff88800d240000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 26.095948][ T11] >ffff88800d240080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.096132][ T11] ^ [ 26.096311][ T11] ffff88800d240100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.096491][ T11] ffff88800d240180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.096671][ T11] ================================================================== [ 26.096875][ T11] Disabling lock debugging due to kernel taint