[ 24.529735][ T67] ================================================================== [ 24.529962][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 24.530163][ T67] Read of size 8 at addr ffff88800bc800f8 by task kworker/u16:1/67 [ 24.530350][ T67] [ 24.530419][ T67] CPU: 2 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 24.530609][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 24.530768][ T67] Workqueue: netns cleanup_net [ 24.530900][ T67] Call Trace: [ 24.530996][ T67] [ 24.531063][ T67] dump_stack_lvl+0x82/0xd0 [ 24.531197][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 24.531355][ T67] ? cleanup_net+0x932/0xa40 [ 24.531482][ T67] print_report+0xb4/0x270 [ 24.531611][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 24.531736][ T67] kasan_report+0xbd/0xf0 [ 24.531841][ T67] ? cleanup_net+0x932/0xa40 [ 24.531972][ T67] cleanup_net+0x932/0xa40 [ 24.532098][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 24.532233][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 24.532353][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 24.532479][ T67] ? lock_acquire+0x32/0xc0 [ 24.532607][ T67] ? process_one_work+0xe0b/0x16d0 [ 24.532741][ T67] process_one_work+0xe55/0x16d0 [ 24.532866][ T67] ? __pfx___lock_release+0x10/0x10 [ 24.532991][ T67] ? __pfx_process_one_work+0x10/0x10 [ 24.533123][ T67] ? assign_work+0x16c/0x240 [ 24.533249][ T67] worker_thread+0x58c/0xce0 [ 24.533370][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 24.533521][ T67] ? __pfx_worker_thread+0x10/0x10 [ 24.533648][ T67] ? __pfx_worker_thread+0x10/0x10 [ 24.533776][ T67] kthread+0x28a/0x350 [ 24.533877][ T67] ? __pfx_kthread+0x10/0x10 [ 24.534000][ T67] ret_from_fork+0x31/0x70 [ 24.534121][ T67] ? __pfx_kthread+0x10/0x10 [ 24.534246][ T67] ret_from_fork_asm+0x1a/0x30 [ 24.534378][ T67] [ 24.534479][ T67] [ 24.534543][ T67] Allocated by task 251: [ 24.534638][ T67] kasan_save_stack+0x24/0x50 [ 24.534765][ T67] kasan_save_track+0x14/0x30 [ 24.534890][ T67] __kasan_slab_alloc+0x59/0x70 [ 24.535010][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 24.535135][ T67] copy_net_ns+0xc6/0x340 [ 24.535231][ T67] create_new_namespaces+0x35f/0x920 [ 24.535358][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 24.535482][ T67] ksys_unshare+0x2a9/0x660 [ 24.535607][ T67] __x64_sys_unshare+0x31/0x40 [ 24.535731][ T67] do_syscall_64+0xc1/0x1d0 [ 24.535863][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 24.536016][ T67] [ 24.536079][ T67] Freed by task 67: [ 24.536173][ T67] kasan_save_stack+0x24/0x50 [ 24.536301][ T67] kasan_save_track+0x14/0x30 [ 24.536427][ T67] kasan_save_free_info+0x3b/0x60 [ 24.536549][ T67] __kasan_slab_free+0x38/0x50 [ 24.536670][ T67] kmem_cache_free+0xf8/0x330 [ 24.536799][ T67] cleanup_net+0x5a8/0xa40 [ 24.536921][ T67] process_one_work+0xe55/0x16d0 [ 24.537043][ T67] worker_thread+0x58c/0xce0 [ 24.537164][ T67] kthread+0x28a/0x350 [ 24.537257][ T67] ret_from_fork+0x31/0x70 [ 24.537379][ T67] ret_from_fork_asm+0x1a/0x30 [ 24.537500][ T67] [ 24.537563][ T67] Last potentially related work creation: [ 24.537689][ T67] kasan_save_stack+0x24/0x50 [ 24.537813][ T67] __kasan_record_aux_stack+0x8e/0xa0 [ 24.537936][ T67] insert_work+0x34/0x230 [ 24.538030][ T67] __queue_work+0x5fd/0xa40 [ 24.538151][ T67] queue_delayed_work_on+0x8c/0xa0 [ 24.538274][ T67] __inet_insert_ifa+0x751/0xb10 [ 24.538401][ T67] inetdev_event+0xb18/0xcf0 [ 24.538522][ T67] notifier_call_chain+0xcd/0x150 [ 24.538650][ T67] __dev_notify_flags+0xe6/0x250 [ 24.538776][ T67] dev_change_flags+0xec/0x160 [ 24.538898][ T67] do_setlink.constprop.0+0x79d/0x2300 [ 24.539023][ T67] rtnl_newlink+0x6de/0xa80 [ 24.539147][ T67] rtnetlink_rcv_msg+0x712/0xc10 [ 24.539271][ T67] netlink_rcv_skb+0x130/0x360 [ 24.539399][ T67] netlink_unicast+0x44b/0x710 [ 24.539522][ T67] netlink_sendmsg+0x723/0xbe0 [ 24.539649][ T67] ____sys_sendmsg+0x7ac/0xa10 [ 24.539776][ T67] ___sys_sendmsg+0xee/0x170 [ 24.539901][ T67] __sys_sendmsg+0x109/0x1a0 [ 24.540022][ T67] do_syscall_64+0xc1/0x1d0 [ 24.540144][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 24.540296][ T67] [ 24.540358][ T67] The buggy address belongs to the object at ffff88800bc80040 [ 24.540358][ T67] which belongs to the cache net_namespace of size 6592 [ 24.540681][ T67] The buggy address is located 184 bytes inside of [ 24.540681][ T67] freed 6592-byte region [ffff88800bc80040, ffff88800bc81a00) [ 24.540973][ T67] [ 24.541037][ T67] The buggy address belongs to the physical page: [ 24.541184][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800bc836c0 pfn:0xbc80 [ 24.541430][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 24.541614][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 24.541769][ T67] page_type: f5(slab) [ 24.541871][ T67] raw: 0080000000000240 ffff888001963240 ffff888001968088 ffff888001968088 [ 24.542088][ T67] raw: ffff88800bc836c0 0000000000040002 00000001f5000000 0000000000000000 [ 24.542306][ T67] head: 0080000000000240 ffff888001963240 ffff888001968088 ffff888001968088 [ 24.542522][ T67] head: ffff88800bc836c0 0000000000040002 00000001f5000000 0000000000000000 [ 24.542736][ T67] head: 0080000000000003 ffffea00002f2001 ffffffffffffffff 0000000000000000 [ 24.542945][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 24.543161][ T67] page dumped because: kasan: bad access detected [ 24.543310][ T67] [ 24.543371][ T67] Memory state around the buggy address: [ 24.543488][ T67] ffff88800bc7ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.543665][ T67] ffff88800bc80000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 24.543841][ T67] >ffff88800bc80080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.544022][ T67] ^ [ 24.544197][ T67] ffff88800bc80100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.544371][ T67] ffff88800bc80180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.544545][ T67] ================================================================== [ 24.544814][ T67] Disabling lock debugging due to kernel taint