[ 10.070643][ T258] ip (258) used greatest stack depth: 23168 bytes left [ 14.104464][ T66] ================================================================== [ 14.104776][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 14.105030][ T66] Read of size 8 at addr ffff888002491bf8 by task kworker/u16:1/66 [ 14.105263][ T66] [ 14.105334][ T66] CPU: 3 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 14.105561][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 14.105733][ T66] Workqueue: netns cleanup_net [ 14.105911][ T66] Call Trace: [ 14.106034][ T66] [ 14.106106][ T66] dump_stack_lvl+0x82/0xd0 [ 14.106250][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 14.106448][ T66] ? cleanup_net+0xa5d/0xb90 [ 14.106587][ T66] print_report+0xb4/0x270 [ 14.106740][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 14.106908][ T66] kasan_report+0xbd/0xf0 [ 14.107047][ T66] ? cleanup_net+0xa5d/0xb90 [ 14.107214][ T66] cleanup_net+0xa5d/0xb90 [ 14.107380][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 14.107568][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 14.107775][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 14.107976][ T66] ? lock_acquire+0x32/0xc0 [ 14.108172][ T66] ? process_one_work+0xe0b/0x16d0 [ 14.108373][ T66] process_one_work+0xe55/0x16d0 [ 14.108579][ T66] ? __pfx___lock_release+0x10/0x10 [ 14.108782][ T66] ? __pfx_process_one_work+0x10/0x10 [ 14.108985][ T66] ? assign_work+0x16c/0x240 [ 14.109183][ T66] worker_thread+0x58c/0xce0 [ 14.109384][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 14.109636][ T66] ? __pfx_worker_thread+0x10/0x10 [ 14.109839][ T66] ? __pfx_worker_thread+0x10/0x10 [ 14.110038][ T66] kthread+0x28a/0x350 [ 14.110192][ T66] ? __pfx_kthread+0x10/0x10 [ 14.110393][ T66] ret_from_fork+0x31/0x70 [ 14.110588][ T66] ? __pfx_kthread+0x10/0x10 [ 14.110786][ T66] ret_from_fork_asm+0x1a/0x30 [ 14.110991][ T66] [ 14.111147][ T66] [ 14.111250][ T66] Allocated by task 255: [ 14.111356][ T66] kasan_save_stack+0x24/0x50 [ 14.111501][ T66] kasan_save_track+0x14/0x30 [ 14.111637][ T66] __kasan_slab_alloc+0x59/0x70 [ 14.111776][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 14.111931][ T66] copy_net_ns+0xc6/0x540 [ 14.112063][ T66] create_new_namespaces+0x35f/0x920 [ 14.112233][ T66] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 14.112403][ T66] ksys_unshare+0x2c4/0x6e0 [ 14.112591][ T66] __x64_sys_unshare+0x31/0x40 [ 14.112794][ T66] do_syscall_64+0xc1/0x1d0 [ 14.112995][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 14.113245][ T66] [ 14.113349][ T66] Freed by task 66: [ 14.113498][ T66] kasan_save_stack+0x24/0x50 [ 14.113699][ T66] kasan_save_track+0x14/0x30 [ 14.113867][ T66] kasan_save_free_info+0x3b/0x60 [ 14.114043][ T66] __kasan_slab_free+0x38/0x50 [ 14.114179][ T66] kmem_cache_free+0xf8/0x330 [ 14.114316][ T66] cleanup_net+0x5a8/0xb90 [ 14.114454][ T66] process_one_work+0xe55/0x16d0 [ 14.114590][ T66] worker_thread+0x58c/0xce0 [ 14.114754][ T66] kthread+0x28a/0x350 [ 14.114882][ T66] ret_from_fork+0x31/0x70 [ 14.115064][ T66] ret_from_fork_asm+0x1a/0x30 [ 14.115220][ T66] [ 14.115291][ T66] Last potentially related work creation: [ 14.115429][ T66] kasan_save_stack+0x24/0x50 [ 14.115600][ T66] __kasan_record_aux_stack+0x8e/0xa0 [ 14.115769][ T66] insert_work+0x34/0x230 [ 14.115898][ T66] __queue_work+0x5fd/0xa40 [ 14.116078][ T66] queue_delayed_work_on+0x8c/0xa0 [ 14.116253][ T66] __inet_insert_ifa+0x751/0xb10 [ 14.116407][ T66] inet_rtm_newaddr+0x833/0xbd0 [ 14.116546][ T66] rtnetlink_rcv_msg+0x712/0xc10 [ 14.116717][ T66] netlink_rcv_skb+0x130/0x360 [ 14.116857][ T66] netlink_unicast+0x44b/0x710 [ 14.117003][ T66] netlink_sendmsg+0x723/0xbe0 [ 14.117141][ T66] ____sys_sendmsg+0x7ac/0xa10 [ 14.117300][ T66] ___sys_sendmsg+0xee/0x170 [ 14.117474][ T66] __sys_sendmsg+0x109/0x1a0 [ 14.117619][ T66] do_syscall_64+0xc1/0x1d0 [ 14.117767][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 14.117983][ T66] [ 14.118068][ T66] The buggy address belongs to the object at ffff888002491b40 [ 14.118068][ T66] which belongs to the cache net_namespace of size 6528 [ 14.118515][ T66] The buggy address is located 184 bytes inside of [ 14.118515][ T66] freed 6528-byte region [ffff888002491b40, ffff8880024934c0) [ 14.118898][ T66] [ 14.118983][ T66] The buggy address belongs to the physical page: [ 14.119174][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888002493640 pfn:0x2490 [ 14.119456][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 14.119660][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 14.119834][ T66] page_type: f5(slab) [ 14.119979][ T66] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 14.120248][ T66] raw: ffff888002493640 0000000000040002 00000001f5000000 0000000000000000 [ 14.120549][ T66] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 14.120856][ T66] head: ffff888002493640 0000000000040002 00000001f5000000 0000000000000000 [ 14.121174][ T66] head: 0080000000000003 ffffea0000092401 ffffffffffffffff 0000000000000000 [ 14.121435][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 14.121705][ T66] page dumped because: kasan: bad access detected [ 14.121900][ T66] [ 14.121985][ T66] Memory state around the buggy address: [ 14.122156][ T66] ffff888002491a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.122423][ T66] ffff888002491b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 14.122692][ T66] >ffff888002491b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 14.122978][ T66] ^ [ 14.123261][ T66] ffff888002491c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 14.123459][ T66] ffff888002491c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 14.123653][ T66] ================================================================== [ 14.123882][ T66] Disabling lock debugging due to kernel taint