[ 17.328381][ T68] ================================================================== [ 17.328697][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 17.328907][ T68] Read of size 8 at addr ffff888004f700f8 by task kworker/u16:1/68 [ 17.329103][ T68] [ 17.329175][ T68] CPU: 3 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 17.329391][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.329560][ T68] Workqueue: netns cleanup_net [ 17.329705][ T68] Call Trace: [ 17.329818][ T68] [ 17.329899][ T68] dump_stack_lvl+0x82/0xd0 [ 17.330041][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 17.330231][ T68] ? cleanup_net+0x932/0xa40 [ 17.330404][ T68] print_report+0xb4/0x270 [ 17.330544][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 17.330681][ T68] kasan_report+0xbd/0xf0 [ 17.330782][ T68] ? cleanup_net+0x932/0xa40 [ 17.330921][ T68] cleanup_net+0x932/0xa40 [ 17.331058][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 17.331204][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 17.331345][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 17.331494][ T68] ? lock_acquire+0x32/0xc0 [ 17.331642][ T68] ? process_one_work+0xe0b/0x16d0 [ 17.331789][ T68] process_one_work+0xe55/0x16d0 [ 17.331939][ T68] ? __pfx___lock_release+0x10/0x10 [ 17.332093][ T68] ? __pfx_process_one_work+0x10/0x10 [ 17.332238][ T68] ? assign_work+0x16c/0x240 [ 17.332391][ T68] worker_thread+0x58c/0xce0 [ 17.332536][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 17.332749][ T68] ? __pfx_worker_thread+0x10/0x10 [ 17.332896][ T68] ? __pfx_worker_thread+0x10/0x10 [ 17.333043][ T68] kthread+0x28a/0x350 [ 17.333158][ T68] ? __pfx_kthread+0x10/0x10 [ 17.333303][ T68] ret_from_fork+0x31/0x70 [ 17.333448][ T68] ? __pfx_kthread+0x10/0x10 [ 17.333595][ T68] ret_from_fork_asm+0x1a/0x30 [ 17.333747][ T68] [ 17.333861][ T68] [ 17.333935][ T68] Allocated by task 224: [ 17.334044][ T68] kasan_save_stack+0x24/0x50 [ 17.334193][ T68] kasan_save_track+0x14/0x30 [ 17.334341][ T68] __kasan_slab_alloc+0x59/0x70 [ 17.334524][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 17.334715][ T68] copy_net_ns+0xc6/0x340 [ 17.334844][ T68] create_new_namespaces+0x35f/0x920 [ 17.334994][ T68] unshare_nsproxy_namespaces+0x8d/0x130 [ 17.335138][ T68] ksys_unshare+0x2a9/0x660 [ 17.335326][ T68] __x64_sys_unshare+0x31/0x40 [ 17.335517][ T68] do_syscall_64+0xc1/0x1d0 [ 17.335716][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 17.335946][ T68] [ 17.336043][ T68] Freed by task 68: [ 17.336183][ T68] kasan_save_stack+0x24/0x50 [ 17.336373][ T68] kasan_save_track+0x14/0x30 [ 17.336563][ T68] kasan_save_free_info+0x3b/0x60 [ 17.336753][ T68] __kasan_slab_free+0x38/0x50 [ 17.336943][ T68] kmem_cache_free+0xf8/0x330 [ 17.337146][ T68] cleanup_net+0x5a8/0xa40 [ 17.337342][ T68] process_one_work+0xe55/0x16d0 [ 17.337553][ T68] worker_thread+0x58c/0xce0 [ 17.337750][ T68] kthread+0x28a/0x350 [ 17.337906][ T68] ret_from_fork+0x31/0x70 [ 17.338114][ T68] ret_from_fork_asm+0x1a/0x30 [ 17.338319][ T68] [ 17.338427][ T68] Last potentially related work creation: [ 17.338637][ T68] kasan_save_stack+0x24/0x50 [ 17.338855][ T68] __kasan_record_aux_stack+0x8e/0xa0 [ 17.339054][ T68] insert_work+0x34/0x230 [ 17.339206][ T68] __queue_work+0x5fd/0xa40 [ 17.339406][ T68] queue_delayed_work_on+0x8c/0xa0 [ 17.339613][ T68] __inet_insert_ifa+0x751/0xb10 [ 17.339815][ T68] inet_rtm_newaddr+0x833/0xbd0 [ 17.340015][ T68] rtnetlink_rcv_msg+0x712/0xc10 [ 17.340211][ T68] netlink_rcv_skb+0x130/0x360 [ 17.340399][ T68] netlink_unicast+0x44b/0x710 [ 17.340590][ T68] netlink_sendmsg+0x723/0xbe0 [ 17.340773][ T68] ____sys_sendmsg+0x7ac/0xa10 [ 17.340983][ T68] ___sys_sendmsg+0xee/0x170 [ 17.341191][ T68] __sys_sendmsg+0x109/0x1a0 [ 17.341397][ T68] do_syscall_64+0xc1/0x1d0 [ 17.341602][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 17.341847][ T68] [ 17.341956][ T68] The buggy address belongs to the object at ffff888004f70040 [ 17.341956][ T68] which belongs to the cache net_namespace of size 5696 [ 17.342493][ T68] The buggy address is located 184 bytes inside of [ 17.342493][ T68] freed 5696-byte region [ffff888004f70040, ffff888004f71680) [ 17.342971][ T68] [ 17.343078][ T68] The buggy address belongs to the physical page: [ 17.343331][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888004f72fc0 pfn:0x4f70 [ 17.343760][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 17.344074][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 17.344340][ T68] page_type: f5(slab) [ 17.344502][ T68] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 17.344854][ T68] raw: ffff888004f72fc0 0000000000050002 00000001f5000000 0000000000000000 [ 17.345102][ T68] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 17.345357][ T68] head: ffff888004f72fc0 0000000000050002 00000001f5000000 0000000000000000 [ 17.345598][ T68] head: 0080000000000003 ffffea000013dc01 ffffffffffffffff 0000000000000000 [ 17.345848][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 17.346098][ T68] page dumped because: kasan: bad access detected [ 17.346267][ T68] [ 17.346343][ T68] Memory state around the buggy address: [ 17.346485][ T68] ffff888004f6ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.346686][ T68] ffff888004f70000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 17.346884][ T68] >ffff888004f70080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.347071][ T68] ^ [ 17.347257][ T68] ffff888004f70100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.347463][ T68] ffff888004f70180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.347670][ T68] ================================================================== [ 17.347906][ T68] Disabling lock debugging due to kernel taint