[ 15.395572][ T68] ================================================================== [ 15.395845][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 15.396052][ T68] Read of size 8 at addr ffff8880112280f8 by task kworker/u16:1/68 [ 15.396249][ T68] [ 15.396320][ T68] CPU: 2 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 15.396529][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 15.396693][ T68] Workqueue: netns cleanup_net [ 15.396833][ T68] Call Trace: [ 15.396943][ T68] [ 15.397022][ T68] dump_stack_lvl+0x82/0xd0 [ 15.397161][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 15.397333][ T68] ? cleanup_net+0x932/0xa40 [ 15.397475][ T68] print_report+0xb4/0x270 [ 15.397609][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 15.397747][ T68] kasan_report+0xbd/0xf0 [ 15.397857][ T68] ? cleanup_net+0x932/0xa40 [ 15.397992][ T68] cleanup_net+0x932/0xa40 [ 15.398130][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 15.398281][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 15.398414][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 15.398549][ T68] ? lock_acquire+0x32/0xc0 [ 15.398694][ T68] ? process_one_work+0xe0b/0x16d0 [ 15.398831][ T68] process_one_work+0xe55/0x16d0 [ 15.398965][ T68] ? __pfx___lock_release+0x10/0x10 [ 15.399100][ T68] ? __pfx_process_one_work+0x10/0x10 [ 15.399239][ T68] ? assign_work+0x16c/0x240 [ 15.399374][ T68] worker_thread+0x58c/0xce0 [ 15.399507][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 15.399676][ T68] ? __pfx_worker_thread+0x10/0x10 [ 15.399815][ T68] ? __pfx_worker_thread+0x10/0x10 [ 15.399940][ T68] kthread+0x28a/0x350 [ 15.400035][ T68] ? __pfx_kthread+0x10/0x10 [ 15.400156][ T68] ret_from_fork+0x31/0x70 [ 15.400279][ T68] ? __pfx_kthread+0x10/0x10 [ 15.400406][ T68] ret_from_fork_asm+0x1a/0x30 [ 15.400541][ T68] [ 15.400634][ T68] [ 15.400698][ T68] Allocated by task 224: [ 15.400790][ T68] kasan_save_stack+0x24/0x50 [ 15.400930][ T68] kasan_save_track+0x14/0x30 [ 15.401072][ T68] __kasan_slab_alloc+0x59/0x70 [ 15.401196][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 15.401321][ T68] copy_net_ns+0xc6/0x340 [ 15.401418][ T68] create_new_namespaces+0x35f/0x920 [ 15.401545][ T68] unshare_nsproxy_namespaces+0x8d/0x130 [ 15.401666][ T68] ksys_unshare+0x2a9/0x660 [ 15.401795][ T68] __x64_sys_unshare+0x31/0x40 [ 15.401917][ T68] do_syscall_64+0xc1/0x1d0 [ 15.402044][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 15.402201][ T68] [ 15.402265][ T68] Freed by task 68: [ 15.402361][ T68] kasan_save_stack+0x24/0x50 [ 15.402487][ T68] kasan_save_track+0x14/0x30 [ 15.402608][ T68] kasan_save_free_info+0x3b/0x60 [ 15.402735][ T68] __kasan_slab_free+0x38/0x50 [ 15.402869][ T68] kmem_cache_free+0xf8/0x330 [ 15.402992][ T68] cleanup_net+0x5a8/0xa40 [ 15.403112][ T68] process_one_work+0xe55/0x16d0 [ 15.403242][ T68] worker_thread+0x58c/0xce0 [ 15.403361][ T68] kthread+0x28a/0x350 [ 15.403456][ T68] ret_from_fork+0x31/0x70 [ 15.403578][ T68] ret_from_fork_asm+0x1a/0x30 [ 15.403699][ T68] [ 15.403762][ T68] Last potentially related work creation: [ 15.403889][ T68] kasan_save_stack+0x24/0x50 [ 15.404027][ T68] __kasan_record_aux_stack+0x8e/0xa0 [ 15.404150][ T68] insert_work+0x34/0x230 [ 15.404244][ T68] __queue_work+0x5fd/0xa40 [ 15.404376][ T68] queue_delayed_work_on+0x8c/0xa0 [ 15.404501][ T68] __inet_insert_ifa+0x751/0xb10 [ 15.404635][ T68] inet_rtm_newaddr+0x833/0xbd0 [ 15.404757][ T68] rtnetlink_rcv_msg+0x712/0xc10 [ 15.404891][ T68] netlink_rcv_skb+0x130/0x360 [ 15.405022][ T68] netlink_unicast+0x44b/0x710 [ 15.405149][ T68] netlink_sendmsg+0x723/0xbe0 [ 15.405271][ T68] ____sys_sendmsg+0x7ac/0xa10 [ 15.405399][ T68] ___sys_sendmsg+0xee/0x170 [ 15.405547][ T68] __sys_sendmsg+0x109/0x1a0 [ 15.405704][ T68] do_syscall_64+0xc1/0x1d0 [ 15.405843][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 15.406004][ T68] [ 15.406071][ T68] The buggy address belongs to the object at ffff888011228040 [ 15.406071][ T68] which belongs to the cache net_namespace of size 5696 [ 15.406395][ T68] The buggy address is located 184 bytes inside of [ 15.406395][ T68] freed 5696-byte region [ffff888011228040, ffff888011229680) [ 15.406697][ T68] [ 15.406768][ T68] The buggy address belongs to the physical page: [ 15.406920][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801122afc0 pfn:0x11228 [ 15.407172][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 15.407356][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 15.407524][ T68] page_type: f5(slab) [ 15.407622][ T68] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 15.407842][ T68] raw: ffff88801122afc0 0000000000050002 00000001f5000000 0000000000000000 [ 15.408067][ T68] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 15.408284][ T68] head: ffff88801122afc0 0000000000050002 00000001f5000000 0000000000000000 [ 15.408517][ T68] head: 0080000000000003 ffffea0000448a01 ffffffffffffffff 0000000000000000 [ 15.408731][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 15.408950][ T68] page dumped because: kasan: bad access detected [ 15.409110][ T68] [ 15.409178][ T68] Memory state around the buggy address: [ 15.409301][ T68] ffff888011227f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.409484][ T68] ffff888011228000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 15.409656][ T68] >ffff888011228080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 15.409833][ T68]