[ 25.190167][ T11] ================================================================== [ 25.190433][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 25.190656][ T11] Read of size 8 at addr ffff8880050200f8 by task kworker/u16:0/11 [ 25.190862][ T11] [ 25.190940][ T11] CPU: 3 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 25.191165][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 25.191357][ T11] Workqueue: netns cleanup_net [ 25.191509][ T11] Call Trace: [ 25.191621][ T11] [ 25.191698][ T11] dump_stack_lvl+0x82/0xd0 [ 25.191848][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 25.192035][ T11] ? cleanup_net+0xa5d/0xb90 [ 25.192182][ T11] print_report+0xb4/0x270 [ 25.192325][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 25.192471][ T11] kasan_report+0xbd/0xf0 [ 25.192583][ T11] ? cleanup_net+0xa5d/0xb90 [ 25.192728][ T11] cleanup_net+0xa5d/0xb90 [ 25.192875][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 25.193023][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 25.193167][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 25.193312][ T11] ? lock_acquire+0x32/0xc0 [ 25.193470][ T11] ? process_one_work+0xe0b/0x16d0 [ 25.193634][ T11] process_one_work+0xe55/0x16d0 [ 25.193796][ T11] ? __pfx___lock_release+0x10/0x10 [ 25.193959][ T11] ? __pfx_process_one_work+0x10/0x10 [ 25.194122][ T11] ? assign_work+0x16c/0x240 [ 25.194279][ T11] worker_thread+0x58c/0xce0 [ 25.194445][ T11] ? __pfx_worker_thread+0x10/0x10 [ 25.194602][ T11] kthread+0x28a/0x350 [ 25.194718][ T11] ? __pfx_kthread+0x10/0x10 [ 25.194864][ T11] ret_from_fork+0x31/0x70 [ 25.195010][ T11] ? __pfx_kthread+0x10/0x10 [ 25.195152][ T11] ret_from_fork_asm+0x1a/0x30 [ 25.195303][ T11] [ 25.195416][ T11] [ 25.195488][ T11] Allocated by task 256: [ 25.195595][ T11] kasan_save_stack+0x24/0x50 [ 25.195741][ T11] kasan_save_track+0x14/0x30 [ 25.195882][ T11] __kasan_slab_alloc+0x59/0x70 [ 25.196022][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 25.196172][ T11] copy_net_ns+0xc6/0x540 [ 25.196284][ T11] create_new_namespaces+0x35f/0x920 [ 25.196435][ T11] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 25.196579][ T11] ksys_unshare+0x2c4/0x6e0 [ 25.196724][ T11] __x64_sys_unshare+0x31/0x40 [ 25.196865][ T11] do_syscall_64+0xc1/0x1d0 [ 25.197015][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 25.197196][ T11] [ 25.197268][ T11] Freed by task 11: [ 25.197378][ T11] kasan_save_stack+0x24/0x50 [ 25.197521][ T11] kasan_save_track+0x14/0x30 [ 25.197668][ T11] kasan_save_free_info+0x3b/0x60 [ 25.197816][ T11] __kasan_slab_free+0x38/0x50 [ 25.197959][ T11] kmem_cache_free+0xf8/0x330 [ 25.198103][ T11] cleanup_net+0x5a8/0xb90 [ 25.198244][ T11] process_one_work+0xe55/0x16d0 [ 25.198390][ T11] worker_thread+0x58c/0xce0 [ 25.198529][ T11] kthread+0x28a/0x350 [ 25.198637][ T11] ret_from_fork+0x31/0x70 [ 25.198781][ T11] ret_from_fork_asm+0x1a/0x30 [ 25.198923][ T11] [ 25.198999][ T11] Last potentially related work creation: [ 25.199142][ T11] kasan_save_stack+0x24/0x50 [ 25.199287][ T11] __kasan_record_aux_stack+0x8e/0xa0 [ 25.199434][ T11] insert_work+0x34/0x230 [ 25.199543][ T11] __queue_work+0x5fd/0xa40 [ 25.199688][ T11] queue_delayed_work_on+0x8c/0xa0 [ 25.199831][ T11] __inet_insert_ifa+0x751/0xb10 [ 25.199979][ T11] inetdev_event+0xb18/0xcf0 [ 25.200119][ T11] notifier_call_chain+0xcd/0x150 [ 25.200260][ T11] __dev_notify_flags+0xe6/0x250 [ 25.200411][ T11] dev_change_flags+0xec/0x160 [ 25.200554][ T11] do_setlink.constprop.0+0x79d/0x2300 [ 25.200699][ T11] rtnl_newlink+0x6de/0xa80 [ 25.200841][ T11] rtnetlink_rcv_msg+0x712/0xc10 [ 25.200985][ T11] netlink_rcv_skb+0x130/0x360 [ 25.201140][ T11] netlink_unicast+0x44b/0x710 [ 25.201293][ T11] netlink_sendmsg+0x723/0xbe0 [ 25.201442][ T11] ____sys_sendmsg+0x7ac/0xa10 [ 25.201589][ T11] ___sys_sendmsg+0xee/0x170 [ 25.201735][ T11] __sys_sendmsg+0x109/0x1a0 [ 25.201881][ T11] do_syscall_64+0xc1/0x1d0 [ 25.202024][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 25.202200][ T11] [ 25.202274][ T11] The buggy address belongs to the object at ffff888005020040 [ 25.202274][ T11] which belongs to the cache net_namespace of size 6528 [ 25.202657][ T11] The buggy address is located 184 bytes inside of [ 25.202657][ T11] freed 6528-byte region [ffff888005020040, ffff8880050219c0) [ 25.202998][ T11] [ 25.203071][ T11] The buggy address belongs to the physical page: [ 25.203248][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888005023640 pfn:0x5020 [ 25.203539][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 25.203753][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 25.203939][ T11] page_type: f5(slab) [ 25.204051][ T11] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 25.204302][ T11] raw: ffff888005023640 0000000000040002 00000001f5000000 0000000000000000 [ 25.204558][ T11] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 25.204813][ T11] head: ffff888005023640 0000000000040002 00000001f5000000 0000000000000000 [ 25.205067][ T11] head: 0080000000000003 ffffea0000140801 ffffffffffffffff 0000000000000000 [ 25.205319][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 25.205573][ T11] page dumped because: kasan: bad access detected [ 25.205754][ T11] [ 25.205827][ T11] Memory state around the buggy address: [ 25.205966][ T11] ffff88800501ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.206177][ T11] ffff888005020000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 25.206387][ T11] >ffff888005020080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.206593][ T11] ^ [ 25.206798][ T11] ffff888005020100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.207002][ T11] ffff888005020180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.207211][ T11] ================================================================== [ 25.207446][ T11] Disabling lock debugging due to kernel taint