[ 11.400192][ T68] ================================================================== [ 11.400432][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.400643][ T68] Read of size 8 at addr ffff8880024100f8 by task kworker/u16:1/68 [ 11.400852][ T68] [ 11.400927][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.401152][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.401323][ T68] Workqueue: netns cleanup_net [ 11.401469][ T68] Call Trace: [ 11.401588][ T68] [ 11.401666][ T68] dump_stack_lvl+0x82/0xd0 [ 11.401815][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 11.401993][ T68] ? cleanup_net+0x932/0xa40 [ 11.402137][ T68] print_report+0xb4/0x270 [ 11.402283][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 11.402428][ T68] kasan_report+0xbd/0xf0 [ 11.402538][ T68] ? cleanup_net+0x932/0xa40 [ 11.402681][ T68] cleanup_net+0x932/0xa40 [ 11.402822][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.402974][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 11.403115][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 11.403271][ T68] ? lock_acquire+0x32/0xc0 [ 11.403416][ T68] ? process_one_work+0xe0b/0x16d0 [ 11.403608][ T68] process_one_work+0xe55/0x16d0 [ 11.403782][ T68] ? __pfx___lock_release+0x10/0x10 [ 11.403942][ T68] ? __pfx_process_one_work+0x10/0x10 [ 11.404113][ T68] ? assign_work+0x16c/0x240 [ 11.404271][ T68] worker_thread+0x58c/0xce0 [ 11.404433][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.404626][ T68] ? __pfx_worker_thread+0x10/0x10 [ 11.404781][ T68] ? __pfx_worker_thread+0x10/0x10 [ 11.404935][ T68] kthread+0x28a/0x350 [ 11.405054][ T68] ? __pfx_kthread+0x10/0x10 [ 11.405234][ T68] ret_from_fork+0x31/0x70 [ 11.405391][ T68] ? __pfx_kthread+0x10/0x10 [ 11.405544][ T68] ret_from_fork_asm+0x1a/0x30 [ 11.405706][ T68] [ 11.405828][ T68] [ 11.405906][ T68] Allocated by task 226: [ 11.406025][ T68] kasan_save_stack+0x24/0x50 [ 11.406188][ T68] kasan_save_track+0x14/0x30 [ 11.406348][ T68] __kasan_slab_alloc+0x59/0x70 [ 11.406509][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.406666][ T68] copy_net_ns+0xc6/0x340 [ 11.406784][ T68] create_new_namespaces+0x35f/0x920 [ 11.406949][ T68] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.407106][ T68] ksys_unshare+0x2a9/0x660 [ 11.407275][ T68] __x64_sys_unshare+0x31/0x40 [ 11.407430][ T68] do_syscall_64+0xc1/0x1d0 [ 11.407584][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.407785][ T68] [ 11.407874][ T68] Freed by task 68: [ 11.407990][ T68] kasan_save_stack+0x24/0x50 [ 11.408148][ T68] kasan_save_track+0x14/0x30 [ 11.408304][ T68] kasan_save_free_info+0x3b/0x60 [ 11.408460][ T68] __kasan_slab_free+0x38/0x50 [ 11.408614][ T68] kmem_cache_free+0xf8/0x330 [ 11.408775][ T68] cleanup_net+0x5a8/0xa40 [ 11.408930][ T68] process_one_work+0xe55/0x16d0 [ 11.409074][ T68] worker_thread+0x58c/0xce0 [ 11.409231][ T68] kthread+0x28a/0x350 [ 11.409348][ T68] ret_from_fork+0x31/0x70 [ 11.409500][ T68] ret_from_fork_asm+0x1a/0x30 [ 11.409654][ T68] [ 11.409733][ T68] The buggy address belongs to the object at ffff888002410040 [ 11.409733][ T68] which belongs to the cache net_namespace of size 5696 [ 11.410145][ T68] The buggy address is located 184 bytes inside of [ 11.410145][ T68] freed 5696-byte region [ffff888002410040, ffff888002411680) [ 11.410516][ T68] [ 11.410592][ T68] The buggy address belongs to the physical page: [ 11.410776][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888002412fc0 pfn:0x2410 [ 11.411090][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.411323][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.411518][ T68] page_type: f5(slab) [ 11.411653][ T68] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.411922][ T68] raw: ffff888002412fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.412193][ T68] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.412464][ T68] head: ffff888002412fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.412738][ T68] head: 0080000000000003 ffffea0000090401 ffffffffffffffff 0000000000000000 [ 11.413007][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.413282][ T68] page dumped because: kasan: bad access detected [ 11.413471][ T68] [ 11.413548][ T68] Memory state around the buggy address: [ 11.413698][ T68] ffff88800240ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.413926][ T68] ffff888002410000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.414153][ T68] >ffff888002410080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.414377][ T68] ^ [ 11.414601][ T68] ffff888002410100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.414822][ T68] ffff888002410180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.415049][ T68] ================================================================== [ 11.415309][ T68] Disabling lock debugging due to kernel taint