[ 29.239055][ T673] ip (673) used greatest stack depth: 23872 bytes left [ 32.147537][ T67] ================================================================== [ 32.147750][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 32.147936][ T67] Read of size 8 at addr ffff88800c071bf8 by task kworker/u16:1/67 [ 32.148115][ T67] [ 32.148178][ T67] CPU: 1 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 32.148363][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 32.148519][ T67] Workqueue: netns cleanup_net [ 32.148648][ T67] Call Trace: [ 32.148745][ T67] [ 32.148811][ T67] dump_stack_lvl+0x82/0xd0 [ 32.148938][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 32.149092][ T67] ? cleanup_net+0xa5d/0xb90 [ 32.149217][ T67] print_report+0xb4/0x270 [ 32.149342][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 32.149467][ T67] kasan_report+0xbd/0xf0 [ 32.149561][ T67] ? cleanup_net+0xa5d/0xb90 [ 32.149685][ T67] cleanup_net+0xa5d/0xb90 [ 32.149809][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 32.149934][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 32.150057][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 32.150181][ T67] ? lock_acquire+0x32/0xc0 [ 32.150304][ T67] ? process_one_work+0xe0b/0x16d0 [ 32.150450][ T67] process_one_work+0xe55/0x16d0 [ 32.150575][ T67] ? __pfx___lock_release+0x10/0x10 [ 32.150700][ T67] ? __pfx_process_one_work+0x10/0x10 [ 32.150824][ T67] ? assign_work+0x16c/0x240 [ 32.150948][ T67] worker_thread+0x58c/0xce0 [ 32.151070][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 32.151228][ T67] ? __pfx_worker_thread+0x10/0x10 [ 32.151351][ T67] ? __pfx_worker_thread+0x10/0x10 [ 32.151473][ T67] kthread+0x28a/0x350 [ 32.151567][ T67] ? __pfx_kthread+0x10/0x10 [ 32.151692][ T67] ret_from_fork+0x31/0x70 [ 32.151814][ T67] ? __pfx_kthread+0x10/0x10 [ 32.151937][ T67] ret_from_fork_asm+0x1a/0x30 [ 32.152065][ T67] [ 32.152158][ T67] [ 32.152224][ T67] Allocated by task 625: [ 32.152318][ T67] kasan_save_stack+0x24/0x50 [ 32.152442][ T67] kasan_save_track+0x14/0x30 [ 32.152562][ T67] __kasan_slab_alloc+0x59/0x70 [ 32.152685][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 32.152809][ T67] copy_net_ns+0xc6/0x540 [ 32.152903][ T67] create_new_namespaces+0x35f/0x920 [ 32.153029][ T67] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 32.153153][ T67] ksys_unshare+0x2c4/0x6e0 [ 32.153275][ T67] __x64_sys_unshare+0x31/0x40 [ 32.153397][ T67] do_syscall_64+0xc1/0x1d0 [ 32.153522][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 32.153677][ T67] [ 32.153764][ T67] Freed by task 67: [ 32.153854][ T67] kasan_save_stack+0x24/0x50 [ 32.153977][ T67] kasan_save_track+0x14/0x30 [ 32.154098][ T67] kasan_save_free_info+0x3b/0x60 [ 32.154220][ T67] __kasan_slab_free+0x38/0x50 [ 32.154345][ T67] kmem_cache_free+0xf8/0x330 [ 32.154466][ T67] cleanup_net+0x5a8/0xb90 [ 32.154586][ T67] process_one_work+0xe55/0x16d0 [ 32.154708][ T67] worker_thread+0x58c/0xce0 [ 32.154828][ T67] kthread+0x28a/0x350 [ 32.154921][ T67] ret_from_fork+0x31/0x70 [ 32.155040][ T67] ret_from_fork_asm+0x1a/0x30 [ 32.155162][ T67] [ 32.155231][ T67] Last potentially related work creation: [ 32.155353][ T67] kasan_save_stack+0x24/0x50 [ 32.155476][ T67] __kasan_record_aux_stack+0x8e/0xa0 [ 32.155599][ T67] insert_work+0x34/0x230 [ 32.155692][ T67] __queue_work+0x5fd/0xa40 [ 32.155812][ T67] queue_delayed_work_on+0x8c/0xa0 [ 32.155933][ T67] __inet_insert_ifa+0x751/0xb10 [ 32.156057][ T67] inet_rtm_newaddr+0x833/0xbd0 [ 32.156179][ T67] rtnetlink_rcv_msg+0x712/0xc10 [ 32.156301][ T67] netlink_rcv_skb+0x130/0x360 [ 32.156425][ T67] netlink_unicast+0x44b/0x710 [ 32.156549][ T67] netlink_sendmsg+0x723/0xbe0 [ 32.156674][ T67] ____sys_sendmsg+0x7ac/0xa10 [ 32.156798][ T67] ___sys_sendmsg+0xee/0x170 [ 32.156920][ T67] __sys_sendmsg+0x109/0x1a0 [ 32.157044][ T67] do_syscall_64+0xc1/0x1d0 [ 32.157168][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 32.157320][ T67] [ 32.157390][ T67] Second to last potentially related work creation: [ 32.157540][ T67] kasan_save_stack+0x24/0x50 [ 32.157664][ T67] __kasan_record_aux_stack+0x8e/0xa0 [ 32.157787][ T67] insert_work+0x34/0x230 [ 32.157881][ T67] __queue_work+0x5fd/0xa40 [ 32.158003][ T67] queue_delayed_work_on+0x8c/0xa0 [ 32.158126][ T67] __inet_insert_ifa+0x751/0xb10 [ 32.158250][ T67] inet_rtm_newaddr+0x833/0xbd0 [ 32.158373][ T67] rtnetlink_rcv_msg+0x712/0xc10 [ 32.158495][ T67] netlink_rcv_skb+0x130/0x360 [ 32.158618][ T67] netlink_unicast+0x44b/0x710 [ 32.158740][ T67] netlink_sendmsg+0x723/0xbe0 [ 32.158866][ T67] ____sys_sendmsg+0x7ac/0xa10 [ 32.158990][ T67] ___sys_sendmsg+0xee/0x170 [ 32.159116][ T67] __sys_sendmsg+0x109/0x1a0 [ 32.159239][ T67] do_syscall_64+0xc1/0x1d0 [ 32.159363][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 32.159515][ T67] [ 32.159578][ T67] The buggy address belongs to the object at ffff88800c071b40 [ 32.159578][ T67] which belongs to the cache net_namespace of size 6528 [ 32.159903][ T67] The buggy address is located 184 bytes inside of [ 32.159903][ T67] freed 6528-byte region [ffff88800c071b40, ffff88800c0734c0) [ 32.160196][ T67] [ 32.160259][ T67] The buggy address belongs to the physical page: [ 32.160419][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800c075140 pfn:0xc070 [ 32.160665][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 32.160849][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 32.161004][ T67] page_type: f5(slab) [ 32.161107][ T67] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 32.161323][ T67] raw: ffff88800c075140 0000000000040003 00000001f5000000 0000000000000000 [ 32.161535][ T67] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 32.161752][ T67] head: ffff88800c075140 0000000000040003 00000001f5000000 0000000000000000 [ 32.161966][ T67] head: 0080000000000003 ffffea0000301c01 ffffffffffffffff 0000000000000000 [ 32.162180][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 32.162394][ T67] page dumped because: kasan: bad access detected [ 32.162551][ T67] [ 32.162612][ T67] Memory state around the buggy address: [ 32.162731][ T67] ffff88800c071a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.162919][ T67] ffff88800c071b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 32.163092][ T67] >ffff88800c071b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.163269][ T67] ^ [ 32.163444][ T67] ffff88800c071c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.163618][ T67] ffff88800c071c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.163792][ T67] ================================================================== [ 32.164023][ T67] Disabling lock debugging due to kernel taint