[ 10.208383][ T67] ================================================================== [ 10.208615][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.208801][ T67] Read of size 8 at addr ffff8880093080f8 by task kworker/u16:1/67 [ 10.208984][ T67] [ 10.209051][ T67] CPU: 2 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.209249][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.209402][ T67] Workqueue: netns cleanup_net [ 10.209538][ T67] Call Trace: [ 10.209643][ T67] [ 10.209711][ T67] dump_stack_lvl+0x82/0xd0 [ 10.209851][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 10.210010][ T67] ? cleanup_net+0x932/0xa40 [ 10.210147][ T67] print_report+0xb4/0x270 [ 10.210273][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 10.210395][ T67] kasan_report+0xbd/0xf0 [ 10.210493][ T67] ? cleanup_net+0x932/0xa40 [ 10.210709][ T67] cleanup_net+0x932/0xa40 [ 10.210837][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.210963][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 10.211096][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 10.211240][ T67] ? lock_acquire+0x32/0xc0 [ 10.211369][ T67] ? process_one_work+0xe0b/0x16d0 [ 10.211498][ T67] process_one_work+0xe55/0x16d0 [ 10.211622][ T67] ? __pfx___lock_release+0x10/0x10 [ 10.211745][ T67] ? __pfx_process_one_work+0x10/0x10 [ 10.211880][ T67] ? assign_work+0x16c/0x240 [ 10.212015][ T67] worker_thread+0x58c/0xce0 [ 10.212146][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.212319][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.212440][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.212578][ T67] kthread+0x28a/0x350 [ 10.212672][ T67] ? __pfx_kthread+0x10/0x10 [ 10.212797][ T67] ret_from_fork+0x31/0x70 [ 10.212928][ T67] ? __pfx_kthread+0x10/0x10 [ 10.213054][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.213182][ T67] [ 10.213281][ T67] [ 10.213352][ T67] Allocated by task 227: [ 10.213447][ T67] kasan_save_stack+0x24/0x50 [ 10.213571][ T67] kasan_save_track+0x14/0x30 [ 10.213694][ T67] __kasan_slab_alloc+0x59/0x70 [ 10.213817][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.213961][ T67] copy_net_ns+0xc6/0x340 [ 10.214070][ T67] create_new_namespaces+0x35f/0x920 [ 10.214197][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.214321][ T67] ksys_unshare+0x2a9/0x660 [ 10.214448][ T67] __x64_sys_unshare+0x31/0x40 [ 10.214584][ T67] do_syscall_64+0xc1/0x1d0 [ 10.214711][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.214873][ T67] [ 10.214935][ T67] Freed by task 67: [ 10.215025][ T67] kasan_save_stack+0x24/0x50 [ 10.215159][ T67] kasan_save_track+0x14/0x30 [ 10.215279][ T67] kasan_save_free_info+0x3b/0x60 [ 10.215413][ T67] __kasan_slab_free+0x38/0x50 [ 10.215532][ T67] kmem_cache_free+0xf8/0x330 [ 10.215654][ T67] cleanup_net+0x5a8/0xa40 [ 10.215774][ T67] process_one_work+0xe55/0x16d0 [ 10.215916][ T67] worker_thread+0x58c/0xce0 [ 10.216045][ T67] kthread+0x28a/0x350 [ 10.216137][ T67] ret_from_fork+0x31/0x70 [ 10.216258][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.216390][ T67] [ 10.216458][ T67] The buggy address belongs to the object at ffff888009308040 [ 10.216458][ T67] which belongs to the cache net_namespace of size 5696 [ 10.216790][ T67] The buggy address is located 184 bytes inside of [ 10.216790][ T67] freed 5696-byte region [ffff888009308040, ffff888009309680) [ 10.217094][ T67] [ 10.217156][ T67] The buggy address belongs to the physical page: [ 10.217304][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800930afc0 pfn:0x9308 [ 10.217552][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.217751][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.217928][ T67] page_type: f5(slab) [ 10.218025][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.218255][ T67] raw: ffff88800930afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.218468][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.218701][ T67] head: ffff88800930afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.218924][ T67] head: 0080000000000003 ffffea000024c201 ffffffffffffffff 0000000000000000 [ 10.219155][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.219380][ T67] page dumped because: kasan: bad access detected [ 10.219538][ T67] [ 10.219600][ T67] Memory state around the buggy address: [ 10.219719][ T67] ffff888009307f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.219899][ T67] ffff888009308000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.220070][ T67] >ffff888009308080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.220260][ T67] ^ [ 10.220443][ T67] ffff888009308100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.220620][ T67] ffff888009308180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.220801][ T67] ================================================================== [ 10.221047][ T67] Disabling lock debugging due to kernel taint