[ 23.434597][ T67] ================================================================== [ 23.434909][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 23.435133][ T67] Read of size 8 at addr ffff8880091e00f8 by task kworker/u16:1/67 [ 23.435343][ T67] [ 23.435422][ T67] CPU: 1 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 23.435614][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 23.435776][ T67] Workqueue: netns cleanup_net [ 23.435944][ T67] Call Trace: [ 23.436062][ T67] [ 23.436130][ T67] dump_stack_lvl+0x82/0xd0 [ 23.436267][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 23.436476][ T67] ? cleanup_net+0x932/0xa40 [ 23.436623][ T67] print_report+0xb4/0x270 [ 23.436770][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 23.436910][ T67] kasan_report+0xbd/0xf0 [ 23.437011][ T67] ? cleanup_net+0x932/0xa40 [ 23.437141][ T67] cleanup_net+0x932/0xa40 [ 23.437292][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 23.437431][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 23.437573][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 23.437709][ T67] ? lock_acquire+0x32/0xc0 [ 23.437838][ T67] ? process_one_work+0xe0b/0x16d0 [ 23.437967][ T67] process_one_work+0xe55/0x16d0 [ 23.438096][ T67] ? __pfx___lock_release+0x10/0x10 [ 23.438225][ T67] ? __pfx_process_one_work+0x10/0x10 [ 23.438359][ T67] ? assign_work+0x16c/0x240 [ 23.438487][ T67] worker_thread+0x58c/0xce0 [ 23.438613][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 23.438767][ T67] ? __pfx_worker_thread+0x10/0x10 [ 23.438897][ T67] ? __pfx_worker_thread+0x10/0x10 [ 23.439021][ T67] kthread+0x28a/0x350 [ 23.439118][ T67] ? __pfx_kthread+0x10/0x10 [ 23.439242][ T67] ret_from_fork+0x31/0x70 [ 23.439379][ T67] ? __pfx_kthread+0x10/0x10 [ 23.439506][ T67] ret_from_fork_asm+0x1a/0x30 [ 23.439639][ T67] [ 23.439740][ T67] [ 23.439816][ T67] Allocated by task 224: [ 23.439929][ T67] kasan_save_stack+0x24/0x50 [ 23.440082][ T67] kasan_save_track+0x14/0x30 [ 23.440223][ T67] __kasan_slab_alloc+0x59/0x70 [ 23.440387][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 23.440546][ T67] copy_net_ns+0xc6/0x340 [ 23.440680][ T67] create_new_namespaces+0x35f/0x920 [ 23.440833][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 23.441000][ T67] ksys_unshare+0x2a9/0x660 [ 23.441148][ T67] __x64_sys_unshare+0x31/0x40 [ 23.441295][ T67] do_syscall_64+0xc1/0x1d0 [ 23.441440][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 23.441620][ T67] [ 23.441697][ T67] Freed by task 67: [ 23.441813][ T67] kasan_save_stack+0x24/0x50 [ 23.441959][ T67] kasan_save_track+0x14/0x30 [ 23.442103][ T67] kasan_save_free_info+0x3b/0x60 [ 23.442246][ T67] __kasan_slab_free+0x38/0x50 [ 23.442392][ T67] kmem_cache_free+0xf8/0x330 [ 23.442555][ T67] cleanup_net+0x5a8/0xa40 [ 23.442727][ T67] process_one_work+0xe55/0x16d0 [ 23.442879][ T67] worker_thread+0x58c/0xce0 [ 23.443032][ T67] kthread+0x28a/0x350 [ 23.443155][ T67] ret_from_fork+0x31/0x70 [ 23.443320][ T67] ret_from_fork_asm+0x1a/0x30 [ 23.443478][ T67] [ 23.443572][ T67] Last potentially related work creation: [ 23.443734][ T67] kasan_save_stack+0x24/0x50 [ 23.443894][ T67] __kasan_record_aux_stack+0x8e/0xa0 [ 23.444050][ T67] insert_work+0x34/0x230 [ 23.444180][ T67] __queue_work+0x5fd/0xa40 [ 23.444349][ T67] queue_delayed_work_on+0x8c/0xa0 [ 23.444528][ T67] __inet_insert_ifa+0x751/0xb10 [ 23.444724][ T67] inet_rtm_newaddr+0x833/0xbd0 [ 23.444879][ T67] rtnetlink_rcv_msg+0x712/0xc10 [ 23.445065][ T67] netlink_rcv_skb+0x130/0x360 [ 23.445231][ T67] netlink_unicast+0x44b/0x710 [ 23.445378][ T67] netlink_sendmsg+0x723/0xbe0 [ 23.445556][ T67] ____sys_sendmsg+0x7ac/0xa10 [ 23.445714][ T67] ___sys_sendmsg+0xee/0x170 [ 23.445878][ T67] __sys_sendmsg+0x109/0x1a0 [ 23.446033][ T67] do_syscall_64+0xc1/0x1d0 [ 23.446217][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 23.446437][ T67] [ 23.446533][ T67] The buggy address belongs to the object at ffff8880091e0040 [ 23.446533][ T67] which belongs to the cache net_namespace of size 5696 [ 23.446903][ T67] The buggy address is located 184 bytes inside of [ 23.446903][ T67] freed 5696-byte region [ffff8880091e0040, ffff8880091e1680) [ 23.447236][ T67] [ 23.447315][ T67] The buggy address belongs to the physical page: [ 23.447491][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880091e2fc0 pfn:0x91e0 [ 23.447788][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 23.448000][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 23.448187][ T67] page_type: f5(slab) [ 23.448316][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 23.448570][ T67] raw: ffff8880091e2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 23.448796][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 23.449055][ T67] head: ffff8880091e2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 23.449291][ T67] head: 0080000000000003 ffffea0000247801 ffffffffffffffff 0000000000000000 [ 23.449544][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 23.449783][ T67] page dumped because: kasan: bad access detected [ 23.449966][ T67] [ 23.450032][ T67] Memory state around the buggy address: [ 23.450164][ T67] ffff8880091dff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.450355][ T67] ffff8880091e0000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 23.450552][ T67] >ffff8880091e0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 23.450769][ T67] ^ [ 23.450963][ T67] ffff8880091e0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 23.451162][ T67] ffff8880091e0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 23.451369][ T67] ================================================================== [ 23.451678][ T67] Disabling lock debugging due to kernel taint