[ 10.652751][ T67] ================================================================== [ 10.652979][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.653194][ T67] Read of size 8 at addr ffff888008c980f8 by task kworker/u16:1/67 [ 10.653381][ T67] [ 10.653461][ T67] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.653666][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.653836][ T67] Workqueue: netns cleanup_net [ 10.654011][ T67] Call Trace: [ 10.654109][ T67] [ 10.654182][ T67] dump_stack_lvl+0x82/0xd0 [ 10.654319][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 10.654499][ T67] ? cleanup_net+0x932/0xa40 [ 10.654669][ T67] print_report+0xb4/0x270 [ 10.654811][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 10.654954][ T67] kasan_report+0xbd/0xf0 [ 10.655055][ T67] ? cleanup_net+0x932/0xa40 [ 10.655195][ T67] cleanup_net+0x932/0xa40 [ 10.655331][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.655485][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 10.655628][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 10.655769][ T67] ? lock_acquire+0x32/0xc0 [ 10.655918][ T67] ? process_one_work+0xe0b/0x16d0 [ 10.656056][ T67] process_one_work+0xe55/0x16d0 [ 10.656191][ T67] ? __pfx___lock_release+0x10/0x10 [ 10.656324][ T67] ? __pfx_process_one_work+0x10/0x10 [ 10.656458][ T67] ? assign_work+0x16c/0x240 [ 10.656593][ T67] worker_thread+0x58c/0xce0 [ 10.656721][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.656882][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.657012][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.657139][ T67] kthread+0x28a/0x350 [ 10.657239][ T67] ? __pfx_kthread+0x10/0x10 [ 10.657373][ T67] ret_from_fork+0x31/0x70 [ 10.657512][ T67] ? __pfx_kthread+0x10/0x10 [ 10.657653][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.657794][ T67] [ 10.657897][ T67] [ 10.657968][ T67] Allocated by task 228: [ 10.658070][ T67] kasan_save_stack+0x24/0x50 [ 10.658202][ T67] kasan_save_track+0x14/0x30 [ 10.658339][ T67] __kasan_slab_alloc+0x59/0x70 [ 10.658476][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.658623][ T67] copy_net_ns+0xc6/0x340 [ 10.658720][ T67] create_new_namespaces+0x35f/0x920 [ 10.658854][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.658986][ T67] ksys_unshare+0x2a9/0x660 [ 10.659122][ T67] __x64_sys_unshare+0x31/0x40 [ 10.659256][ T67] do_syscall_64+0xc1/0x1d0 [ 10.659385][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.659549][ T67] [ 10.659619][ T67] Freed by task 67: [ 10.659719][ T67] kasan_save_stack+0x24/0x50 [ 10.659854][ T67] kasan_save_track+0x14/0x30 [ 10.659986][ T67] kasan_save_free_info+0x3b/0x60 [ 10.660119][ T67] __kasan_slab_free+0x38/0x50 [ 10.660251][ T67] kmem_cache_free+0xf8/0x330 [ 10.660378][ T67] cleanup_net+0x5a8/0xa40 [ 10.660514][ T67] process_one_work+0xe55/0x16d0 [ 10.660651][ T67] worker_thread+0x58c/0xce0 [ 10.660786][ T67] kthread+0x28a/0x350 [ 10.660883][ T67] ret_from_fork+0x31/0x70 [ 10.661008][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.661137][ T67] [ 10.661204][ T67] The buggy address belongs to the object at ffff888008c98040 [ 10.661204][ T67] which belongs to the cache net_namespace of size 5696 [ 10.661563][ T67] The buggy address is located 184 bytes inside of [ 10.661563][ T67] freed 5696-byte region [ffff888008c98040, ffff888008c99680) [ 10.661891][ T67] [ 10.661967][ T67] The buggy address belongs to the physical page: [ 10.662125][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888008c9afc0 pfn:0x8c98 [ 10.662379][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.662576][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.662764][ T67] page_type: f5(slab) [ 10.662875][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.663111][ T67] raw: ffff888008c9afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.663349][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.663582][ T67] head: ffff888008c9afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.663816][ T67] head: 0080000000000003 ffffea0000232601 ffffffffffffffff 0000000000000000 [ 10.664060][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.664291][ T67] page dumped because: kasan: bad access detected [ 10.664445][ T67] [ 10.664509][ T67] Memory state around the buggy address: [ 10.664634][ T67] ffff888008c97f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.664820][ T67] ffff888008c98000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.665010][ T67] >ffff888008c98080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.665204][ T67] ^ [ 10.665417][ T67] ffff888008c98100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.665610][ T67] ffff888008c98180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.665793][ T67] ================================================================== [ 10.665997][ T67] Disabling lock debugging due to kernel taint [ 55.049760][ T228] bench-lookups_i (228) used greatest stack depth: 23968 bytes left