[ 36.655309][ T11] ================================================================== [ 36.655597][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 36.655780][ T11] Read of size 8 at addr ffff88800a1700f8 by task kworker/u16:0/11 [ 36.655956][ T11] [ 36.656024][ T11] CPU: 2 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 36.656204][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 36.656357][ T11] Workqueue: netns cleanup_net [ 36.656484][ T11] Call Trace: [ 36.656576][ T11] [ 36.656644][ T11] dump_stack_lvl+0x82/0xd0 [ 36.656772][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 36.656927][ T11] ? cleanup_net+0xa5d/0xb90 [ 36.657050][ T11] print_report+0xb4/0x270 [ 36.657171][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 36.657296][ T11] kasan_report+0xbd/0xf0 [ 36.657397][ T11] ? cleanup_net+0xa5d/0xb90 [ 36.657526][ T11] cleanup_net+0xa5d/0xb90 [ 36.657648][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 36.657779][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 36.657901][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 36.658028][ T11] ? lock_acquire+0x32/0xc0 [ 36.658170][ T11] ? process_one_work+0xe0b/0x16d0 [ 36.658294][ T11] process_one_work+0xe55/0x16d0 [ 36.658418][ T11] ? __pfx___lock_release+0x10/0x10 [ 36.658538][ T11] ? __pfx_process_one_work+0x10/0x10 [ 36.658666][ T11] ? assign_work+0x16c/0x240 [ 36.658790][ T11] worker_thread+0x58c/0xce0 [ 36.658917][ T11] ? __pfx_worker_thread+0x10/0x10 [ 36.659038][ T11] kthread+0x28a/0x350 [ 36.659131][ T11] ? __pfx_kthread+0x10/0x10 [ 36.659252][ T11] ret_from_fork+0x31/0x70 [ 36.659373][ T11] ? __pfx_kthread+0x10/0x10 [ 36.659494][ T11] ret_from_fork_asm+0x1a/0x30 [ 36.659623][ T11] [ 36.659716][ T11] [ 36.659776][ T11] Allocated by task 252: [ 36.659868][ T11] kasan_save_stack+0x24/0x50 [ 36.659991][ T11] kasan_save_track+0x14/0x30 [ 36.660110][ T11] __kasan_slab_alloc+0x59/0x70 [ 36.660229][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 36.660353][ T11] copy_net_ns+0xc6/0x540 [ 36.660544][ T11] create_new_namespaces+0x35f/0x920 [ 36.660672][ T11] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 36.660792][ T11] ksys_unshare+0x2c4/0x6e0 [ 36.660915][ T11] __x64_sys_unshare+0x31/0x40 [ 36.661036][ T11] do_syscall_64+0xc1/0x1d0 [ 36.661158][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 36.661309][ T11] [ 36.661373][ T11] Freed by task 11: [ 36.661464][ T11] kasan_save_stack+0x24/0x50 [ 36.661588][ T11] kasan_save_track+0x14/0x30 [ 36.661707][ T11] kasan_save_free_info+0x3b/0x60 [ 36.661828][ T11] __kasan_slab_free+0x38/0x50 [ 36.661948][ T11] kmem_cache_free+0xf8/0x330 [ 36.662068][ T11] cleanup_net+0x5a8/0xb90 [ 36.662188][ T11] process_one_work+0xe55/0x16d0 [ 36.662307][ T11] worker_thread+0x58c/0xce0 [ 36.662428][ T11] kthread+0x28a/0x350 [ 36.662524][ T11] ret_from_fork+0x31/0x70 [ 36.662642][ T11] ret_from_fork_asm+0x1a/0x30 [ 36.662760][ T11] [ 36.662832][ T11] Last potentially related work creation: [ 36.662953][ T11] kasan_save_stack+0x24/0x50 [ 36.663074][ T11] __kasan_record_aux_stack+0x8e/0xa0 [ 36.663195][ T11] insert_work+0x34/0x230 [ 36.663289][ T11] __queue_work+0x5fd/0xa40 [ 36.663414][ T11] queue_delayed_work_on+0x8c/0xa0 [ 36.663535][ T11] __inet_insert_ifa+0x751/0xb10 [ 36.663657][ T11] inetdev_event+0xb18/0xcf0 [ 36.663780][ T11] notifier_call_chain+0xcd/0x150 [ 36.663903][ T11] __dev_notify_flags+0xe6/0x250 [ 36.664024][ T11] dev_change_flags+0xec/0x160 [ 36.664145][ T11] do_setlink.constprop.0+0x79d/0x2300 [ 36.664269][ T11] rtnl_newlink+0x6de/0xa80 [ 36.664394][ T11] rtnetlink_rcv_msg+0x712/0xc10 [ 36.664514][ T11] netlink_rcv_skb+0x130/0x360 [ 36.664637][ T11] netlink_unicast+0x44b/0x710 [ 36.664761][ T11] netlink_sendmsg+0x723/0xbe0 [ 36.664883][ T11] ____sys_sendmsg+0x7ac/0xa10 [ 36.665004][ T11] ___sys_sendmsg+0xee/0x170 [ 36.665125][ T11] __sys_sendmsg+0x109/0x1a0 [ 36.665248][ T11] do_syscall_64+0xc1/0x1d0 [ 36.665373][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 36.665525][ T11] [ 36.665587][ T11] The buggy address belongs to the object at ffff88800a170040 [ 36.665587][ T11] which belongs to the cache net_namespace of size 6528 [ 36.665906][ T11] The buggy address is located 184 bytes inside of [ 36.665906][ T11] freed 6528-byte region [ffff88800a170040, ffff88800a1719c0) [ 36.666198][ T11] [ 36.666260][ T11] The buggy address belongs to the physical page: [ 36.666406][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a175140 pfn:0xa170 [ 36.666648][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 36.666829][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 36.666986][ T11] page_type: f5(slab) [ 36.667081][ T11] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 36.667298][ T11] raw: ffff88800a175140 0000000000040003 00000001f5000000 0000000000000000 [ 36.667510][ T11] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 36.667723][ T11] head: ffff88800a175140 0000000000040003 00000001f5000000 0000000000000000 [ 36.667936][ T11] head: 0080000000000003 ffffea0000285c01 ffffffffffffffff 0000000000000000 [ 36.668149][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 36.668359][ T11] page dumped because: kasan: bad access detected [ 36.668507][ T11] [ 36.668568][ T11] Memory state around the buggy address: [ 36.668689][ T11] ffff88800a16ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 36.668863][ T11] ffff88800a170000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 36.669042][ T11] >ffff88800a170080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.669217][ T11] ^ [ 36.669389][ T11] ffff88800a170100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.669564][ T11] ffff88800a170180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.669734][ T11] ================================================================== [ 36.669952][ T11] Disabling lock debugging due to kernel taint