[ 40.331860][ T68] ================================================================== [ 40.332140][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 40.332382][ T68] Read of size 8 at addr ffff88800a8b00f8 by task kworker/u16:1/68 [ 40.332610][ T68] [ 40.332694][ T68] CPU: 2 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 40.332915][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 40.333089][ T68] Workqueue: netns cleanup_net [ 40.333243][ T68] Call Trace: [ 40.333356][ T68] [ 40.333434][ T68] dump_stack_lvl+0x82/0xd0 [ 40.333582][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 40.333771][ T68] ? cleanup_net+0x932/0xa40 [ 40.333931][ T68] print_report+0xb4/0x270 [ 40.334085][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 40.334239][ T68] kasan_report+0xbd/0xf0 [ 40.334356][ T68] ? cleanup_net+0x932/0xa40 [ 40.334507][ T68] cleanup_net+0x932/0xa40 [ 40.334659][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 40.334814][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 40.334970][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 40.335102][ T68] ? lock_acquire+0x32/0xc0 [ 40.335233][ T68] ? process_one_work+0xe0b/0x16d0 [ 40.335376][ T68] process_one_work+0xe55/0x16d0 [ 40.335523][ T68] ? __pfx___lock_release+0x10/0x10 [ 40.335675][ T68] ? __pfx_process_one_work+0x10/0x10 [ 40.335822][ T68] ? assign_work+0x16c/0x240 [ 40.335962][ T68] worker_thread+0x58c/0xce0 [ 40.336107][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 40.336294][ T68] ? __pfx_worker_thread+0x10/0x10 [ 40.336447][ T68] ? __pfx_worker_thread+0x10/0x10 [ 40.336579][ T68] kthread+0x28a/0x350 [ 40.336680][ T68] ? __pfx_kthread+0x10/0x10 [ 40.336825][ T68] ret_from_fork+0x31/0x70 [ 40.336960][ T68] ? __pfx_kthread+0x10/0x10 [ 40.337092][ T68] ret_from_fork_asm+0x1a/0x30 [ 40.337226][ T68] [ 40.337341][ T68] [ 40.337420][ T68] Allocated by task 263: [ 40.337520][ T68] kasan_save_stack+0x24/0x50 [ 40.337648][ T68] kasan_save_track+0x14/0x30 [ 40.337773][ T68] __kasan_slab_alloc+0x59/0x70 [ 40.337893][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 40.338021][ T68] copy_net_ns+0xc6/0x340 [ 40.338123][ T68] create_new_namespaces+0x35f/0x920 [ 40.338250][ T68] unshare_nsproxy_namespaces+0x8d/0x130 [ 40.338378][ T68] ksys_unshare+0x2a9/0x660 [ 40.338509][ T68] __x64_sys_unshare+0x31/0x40 [ 40.338643][ T68] do_syscall_64+0xc1/0x1d0 [ 40.338788][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 40.338943][ T68] [ 40.339012][ T68] Freed by task 68: [ 40.339118][ T68] kasan_save_stack+0x24/0x50 [ 40.339268][ T68] kasan_save_track+0x14/0x30 [ 40.339401][ T68] kasan_save_free_info+0x3b/0x60 [ 40.339544][ T68] __kasan_slab_free+0x38/0x50 [ 40.339672][ T68] kmem_cache_free+0xf8/0x330 [ 40.339813][ T68] cleanup_net+0x5a8/0xa40 [ 40.339960][ T68] process_one_work+0xe55/0x16d0 [ 40.340117][ T68] worker_thread+0x58c/0xce0 [ 40.340285][ T68] kthread+0x28a/0x350 [ 40.340393][ T68] ret_from_fork+0x31/0x70 [ 40.340528][ T68] ret_from_fork_asm+0x1a/0x30 [ 40.340676][ T68] [ 40.340754][ T68] The buggy address belongs to the object at ffff88800a8b0040 [ 40.340754][ T68] which belongs to the cache net_namespace of size 5696 [ 40.341177][ T68] The buggy address is located 184 bytes inside of [ 40.341177][ T68] freed 5696-byte region [ffff88800a8b0040, ffff88800a8b1680) [ 40.341549][ T68] [ 40.341632][ T68] The buggy address belongs to the physical page: [ 40.341822][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a8b2fc0 pfn:0xa8b0 [ 40.342156][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 40.342390][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 40.342586][ T68] page_type: f5(slab) [ 40.342709][ T68] raw: 0080000000000240 ffff888001927240 ffff88800192a088 ffff88800192a088 [ 40.342974][ T68] raw: ffff88800a8b2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 40.343203][ T68] head: 0080000000000240 ffff888001927240 ffff88800192a088 ffff88800192a088 [ 40.343440][ T68] head: ffff88800a8b2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 40.343692][ T68] head: 0080000000000003 ffffea00002a2c01 ffffffffffffffff 0000000000000000 [ 40.343938][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 40.344186][ T68] page dumped because: kasan: bad access detected [ 40.344362][ T68] [ 40.344437][ T68] Memory state around the buggy address: [ 40.344568][ T68] ffff88800a8aff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 40.344754][ T68] ffff88800a8b0000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 40.344954][ T68] >ffff88800a8b0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 40.345162][ T68] ^ [ 40.345363][ T68] ffff88800a8b0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 40.345562][ T68] ffff88800a8b0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 40.345760][ T68] ================================================================== [ 40.346025][ T68] Disabling lock debugging due to kernel taint