[ 29.945677][ T674] ip (674) used greatest stack depth: 23472 bytes left [ 32.899211][ T67] ================================================================== [ 32.899496][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 32.899682][ T67] Read of size 8 at addr ffff88800a8b9bf8 by task kworker/u16:1/67 [ 32.899860][ T67] [ 32.899922][ T67] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 32.900108][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 32.900265][ T67] Workqueue: netns cleanup_net [ 32.900395][ T67] Call Trace: [ 32.900489][ T67] [ 32.900554][ T67] dump_stack_lvl+0x82/0xd0 [ 32.900698][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 32.900870][ T67] ? cleanup_net+0xa5d/0xb90 [ 32.900993][ T67] print_report+0xb4/0x270 [ 32.901115][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 32.901236][ T67] kasan_report+0xbd/0xf0 [ 32.901330][ T67] ? cleanup_net+0xa5d/0xb90 [ 32.901454][ T67] cleanup_net+0xa5d/0xb90 [ 32.901577][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 32.901701][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 32.901833][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 32.901958][ T67] ? lock_acquire+0x32/0xc0 [ 32.902080][ T67] ? process_one_work+0xe0b/0x16d0 [ 32.902204][ T67] process_one_work+0xe55/0x16d0 [ 32.902332][ T67] ? __pfx___lock_release+0x10/0x10 [ 32.902456][ T67] ? __pfx_process_one_work+0x10/0x10 [ 32.902580][ T67] ? assign_work+0x16c/0x240 [ 32.902701][ T67] worker_thread+0x58c/0xce0 [ 32.902824][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 32.902979][ T67] ? __pfx_worker_thread+0x10/0x10 [ 32.903103][ T67] ? __pfx_worker_thread+0x10/0x10 [ 32.903225][ T67] kthread+0x28a/0x350 [ 32.903323][ T67] ? __pfx_kthread+0x10/0x10 [ 32.903447][ T67] ret_from_fork+0x31/0x70 [ 32.903571][ T67] ? __pfx_kthread+0x10/0x10 [ 32.903699][ T67] ret_from_fork_asm+0x1a/0x30 [ 32.903828][ T67] [ 32.903923][ T67] [ 32.903986][ T67] Allocated by task 626: [ 32.904082][ T67] kasan_save_stack+0x24/0x50 [ 32.904207][ T67] kasan_save_track+0x14/0x30 [ 32.904329][ T67] __kasan_slab_alloc+0x59/0x70 [ 32.904449][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 32.904575][ T67] copy_net_ns+0xc6/0x540 [ 32.904667][ T67] create_new_namespaces+0x35f/0x920 [ 32.904794][ T67] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 32.904919][ T67] ksys_unshare+0x2c4/0x6e0 [ 32.905042][ T67] __x64_sys_unshare+0x31/0x40 [ 32.905164][ T67] do_syscall_64+0xc1/0x1d0 [ 32.905288][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 32.905442][ T67] [ 32.905507][ T67] Freed by task 67: [ 32.905604][ T67] kasan_save_stack+0x24/0x50 [ 32.905728][ T67] kasan_save_track+0x14/0x30 [ 32.905852][ T67] kasan_save_free_info+0x3b/0x60 [ 32.905973][ T67] __kasan_slab_free+0x38/0x50 [ 32.906095][ T67] kmem_cache_free+0xf8/0x330 [ 32.906218][ T67] cleanup_net+0x5a8/0xb90 [ 32.906340][ T67] process_one_work+0xe55/0x16d0 [ 32.906461][ T67] worker_thread+0x58c/0xce0 [ 32.906582][ T67] kthread+0x28a/0x350 [ 32.906675][ T67] ret_from_fork+0x31/0x70 [ 32.906799][ T67] ret_from_fork_asm+0x1a/0x30 [ 32.906926][ T67] [ 32.906989][ T67] Last potentially related work creation: [ 32.907110][ T67] kasan_save_stack+0x24/0x50 [ 32.907239][ T67] __kasan_record_aux_stack+0x8e/0xa0 [ 32.907365][ T67] insert_work+0x34/0x230 [ 32.907458][ T67] __queue_work+0x5fd/0xa40 [ 32.907580][ T67] queue_delayed_work_on+0x8c/0xa0 [ 32.907702][ T67] __inet_insert_ifa+0x751/0xb10 [ 32.907829][ T67] inet_rtm_newaddr+0x833/0xbd0 [ 32.907952][ T67] rtnetlink_rcv_msg+0x712/0xc10 [ 32.908075][ T67] netlink_rcv_skb+0x130/0x360 [ 32.908199][ T67] netlink_unicast+0x44b/0x710 [ 32.908325][ T67] netlink_sendmsg+0x723/0xbe0 [ 32.908449][ T67] ____sys_sendmsg+0x7ac/0xa10 [ 32.908572][ T67] ___sys_sendmsg+0xee/0x170 [ 32.908696][ T67] __sys_sendmsg+0x109/0x1a0 [ 32.908822][ T67] do_syscall_64+0xc1/0x1d0 [ 32.908944][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 32.909099][ T67] [ 32.909162][ T67] Second to last potentially related work creation: [ 32.909313][ T67] kasan_save_stack+0x24/0x50 [ 32.909436][ T67] __kasan_record_aux_stack+0x8e/0xa0 [ 32.909567][ T67] insert_work+0x34/0x230 [ 32.909659][ T67] __queue_work+0x5fd/0xa40 [ 32.909782][ T67] queue_delayed_work_on+0x8c/0xa0 [ 32.909905][ T67] __inet_insert_ifa+0x751/0xb10 [ 32.910027][ T67] inet_rtm_newaddr+0x833/0xbd0 [ 32.910148][ T67] rtnetlink_rcv_msg+0x712/0xc10 [ 32.910275][ T67] netlink_rcv_skb+0x130/0x360 [ 32.910397][ T67] netlink_unicast+0x44b/0x710 [ 32.910519][ T67] netlink_sendmsg+0x723/0xbe0 [ 32.910641][ T67] ____sys_sendmsg+0x7ac/0xa10 [ 32.910763][ T67] ___sys_sendmsg+0xee/0x170 [ 32.910887][ T67] __sys_sendmsg+0x109/0x1a0 [ 32.911013][ T67] do_syscall_64+0xc1/0x1d0 [ 32.911137][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 32.911292][ T67] [ 32.911358][ T67] The buggy address belongs to the object at ffff88800a8b9b40 [ 32.911358][ T67] which belongs to the cache net_namespace of size 6528 [ 32.911682][ T67] The buggy address is located 184 bytes inside of [ 32.911682][ T67] freed 6528-byte region [ffff88800a8b9b40, ffff88800a8bb4c0) [ 32.911980][ T67] [ 32.912043][ T67] The buggy address belongs to the physical page: [ 32.912192][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a8bd140 pfn:0xa8b8 [ 32.912438][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 32.912623][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 32.912777][ T67] page_type: f5(slab) [ 32.912876][ T67] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 32.913092][ T67] raw: ffff88800a8bd140 0000000000040003 00000001f5000000 0000000000000000 [ 32.913309][ T67] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 32.913528][ T67] head: ffff88800a8bd140 0000000000040003 00000001f5000000 0000000000000000 [ 32.913743][ T67] head: 0080000000000003 ffffea00002a2e01 ffffffffffffffff 0000000000000000 [ 32.913956][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 32.914170][ T67] page dumped because: kasan: bad access detected [ 32.914318][ T67] [ 32.914385][ T67] Memory state around the buggy address: [ 32.914502][ T67] ffff88800a8b9a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.914679][ T67] ffff88800a8b9b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 32.914850][ T67] >ffff88800a8b9b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.915024][ T67] ^ [ 32.915202][ T67] ffff88800a8b9c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.915377][ T67] ffff88800a8b9c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.915551][ T67] ================================================================== [ 32.915771][ T67] Disabling lock debugging due to kernel taint