[ 18.568437][ T68] ================================================================== [ 18.568671][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 18.568876][ T68] Read of size 8 at addr ffff88800cad80f8 by task kworker/u16:1/68 [ 18.569062][ T68] [ 18.569126][ T68] CPU: 2 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 18.569318][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 18.569482][ T68] Workqueue: netns cleanup_net [ 18.569616][ T68] Call Trace: [ 18.569716][ T68] [ 18.569784][ T68] dump_stack_lvl+0x82/0xd0 [ 18.569940][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 18.570107][ T68] ? cleanup_net+0xa5d/0xb90 [ 18.570242][ T68] print_report+0xb4/0x270 [ 18.570373][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 18.570500][ T68] kasan_report+0xbd/0xf0 [ 18.570596][ T68] ? cleanup_net+0xa5d/0xb90 [ 18.570726][ T68] cleanup_net+0xa5d/0xb90 [ 18.570873][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 18.571003][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 18.571140][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 18.571271][ T68] ? lock_acquire+0x32/0xc0 [ 18.571396][ T68] ? process_one_work+0xe0b/0x16d0 [ 18.571530][ T68] process_one_work+0xe55/0x16d0 [ 18.571667][ T68] ? __pfx___lock_release+0x10/0x10 [ 18.571818][ T68] ? __pfx_process_one_work+0x10/0x10 [ 18.571953][ T68] ? assign_work+0x16c/0x240 [ 18.572075][ T68] worker_thread+0x58c/0xce0 [ 18.572201][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 18.572359][ T68] ? __pfx_worker_thread+0x10/0x10 [ 18.572482][ T68] ? __pfx_worker_thread+0x10/0x10 [ 18.572610][ T68] kthread+0x28a/0x350 [ 18.572709][ T68] ? __pfx_kthread+0x10/0x10 [ 18.572836][ T68] ret_from_fork+0x31/0x70 [ 18.572967][ T68] ? __pfx_kthread+0x10/0x10 [ 18.573095][ T68] ret_from_fork_asm+0x1a/0x30 [ 18.573229][ T68] [ 18.573325][ T68] [ 18.573388][ T68] Allocated by task 253: [ 18.573485][ T68] kasan_save_stack+0x24/0x50 [ 18.573617][ T68] kasan_save_track+0x14/0x30 [ 18.573746][ T68] __kasan_slab_alloc+0x59/0x70 [ 18.573872][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 18.574000][ T68] copy_net_ns+0xc6/0x540 [ 18.574098][ T68] create_new_namespaces+0x35f/0x920 [ 18.574226][ T68] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 18.574355][ T68] ksys_unshare+0x2c4/0x6e0 [ 18.574482][ T68] __x64_sys_unshare+0x31/0x40 [ 18.574604][ T68] do_syscall_64+0xc1/0x1d0 [ 18.574733][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 18.574886][ T68] [ 18.574949][ T68] Freed by task 68: [ 18.575043][ T68] kasan_save_stack+0x24/0x50 [ 18.575185][ T68] kasan_save_track+0x14/0x30 [ 18.575305][ T68] kasan_save_free_info+0x3b/0x60 [ 18.575429][ T68] __kasan_slab_free+0x38/0x50 [ 18.575551][ T68] kmem_cache_free+0xf8/0x330 [ 18.575673][ T68] cleanup_net+0x5a8/0xb90 [ 18.575796][ T68] process_one_work+0xe55/0x16d0 [ 18.575920][ T68] worker_thread+0x58c/0xce0 [ 18.576044][ T68] kthread+0x28a/0x350 [ 18.576136][ T68] ret_from_fork+0x31/0x70 [ 18.576274][ T68] ret_from_fork_asm+0x1a/0x30 [ 18.576398][ T68] [ 18.576462][ T68] Last potentially related work creation: [ 18.576582][ T68] kasan_save_stack+0x24/0x50 [ 18.576707][ T68] __kasan_record_aux_stack+0x8e/0xa0 [ 18.576828][ T68] insert_work+0x34/0x230 [ 18.576920][ T68] __queue_work+0x5fd/0xa40 [ 18.577039][ T68] queue_delayed_work_on+0x8c/0xa0 [ 18.577162][ T68] __inet_insert_ifa+0x751/0xb10 [ 18.577288][ T68] inetdev_event+0xb18/0xcf0 [ 18.577407][ T68] notifier_call_chain+0xcd/0x150 [ 18.577526][ T68] __dev_notify_flags+0xe6/0x250 [ 18.577645][ T68] dev_change_flags+0xec/0x160 [ 18.577765][ T68] do_setlink.constprop.0+0x79d/0x2300 [ 18.577892][ T68] rtnl_newlink+0x6de/0xa80 [ 18.578013][ T68] rtnetlink_rcv_msg+0x712/0xc10 [ 18.578134][ T68] netlink_rcv_skb+0x130/0x360 [ 18.578257][ T68] netlink_unicast+0x44b/0x710 [ 18.578398][ T68] netlink_sendmsg+0x723/0xbe0 [ 18.578523][ T68] ____sys_sendmsg+0x7ac/0xa10 [ 18.578662][ T68] ___sys_sendmsg+0xee/0x170 [ 18.578784][ T68] __sys_sendmsg+0x109/0x1a0 [ 18.578908][ T68] do_syscall_64+0xc1/0x1d0 [ 18.579032][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 18.579186][ T68] [ 18.579253][ T68] The buggy address belongs to the object at ffff88800cad8040 [ 18.579253][ T68] which belongs to the cache net_namespace of size 6528 [ 18.579610][ T68] The buggy address is located 184 bytes inside of [ 18.579610][ T68] freed 6528-byte region [ffff88800cad8040, ffff88800cad99c0) [ 18.579904][ T68] [ 18.579966][ T68] The buggy address belongs to the physical page: [ 18.580113][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800cadb640 pfn:0xcad8 [ 18.580357][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 18.580537][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 18.580693][ T68] page_type: f5(slab) [ 18.580789][ T68] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 18.580999][ T68] raw: ffff88800cadb640 0000000000040002 00000001f5000000 0000000000000000 [ 18.581210][ T68] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 18.581425][ T68] head: ffff88800cadb640 0000000000040002 00000001f5000000 0000000000000000 [ 18.581636][ T68] head: 0080000000000003 ffffea000032b601 ffffffffffffffff 0000000000000000 [ 18.581886][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 18.582114][ T68] page dumped because: kasan: bad access detected [ 18.582276][ T68] [ 18.582341][ T68] Memory state around the buggy address: [ 18.582471][ T68] ffff88800cad7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.582661][ T68] ffff88800cad8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 18.582845][ T68] >ffff88800cad8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 18.583040][ T68] ^ [ 18.583218][ T68] ffff88800cad8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 18.583392][ T68] ffff88800cad8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 18.583572][ T68] ================================================================== [ 18.583803][ T68] Disabling lock debugging due to kernel taint