[ 12.209859][ T67] ================================================================== [ 12.210133][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 12.210349][ T67] Read of size 8 at addr ffff888008c900f8 by task kworker/u16:1/67 [ 12.210542][ T67] [ 12.210617][ T67] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 12.210842][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.211012][ T67] Workqueue: netns cleanup_net [ 12.211147][ T67] Call Trace: [ 12.211254][ T67] [ 12.211344][ T67] dump_stack_lvl+0x82/0xd0 [ 12.211492][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 12.211663][ T67] ? cleanup_net+0x932/0xa40 [ 12.211794][ T67] print_report+0xb4/0x270 [ 12.211930][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 12.212060][ T67] kasan_report+0xbd/0xf0 [ 12.212172][ T67] ? cleanup_net+0x932/0xa40 [ 12.212309][ T67] cleanup_net+0x932/0xa40 [ 12.212477][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 12.212617][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 12.212746][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 12.212875][ T67] ? lock_acquire+0x32/0xc0 [ 12.213010][ T67] ? process_one_work+0xe0b/0x16d0 [ 12.213145][ T67] process_one_work+0xe55/0x16d0 [ 12.213272][ T67] ? __pfx___lock_release+0x10/0x10 [ 12.213415][ T67] ? __pfx_process_one_work+0x10/0x10 [ 12.213582][ T67] ? assign_work+0x16c/0x240 [ 12.213737][ T67] worker_thread+0x58c/0xce0 [ 12.213864][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 12.214044][ T67] ? __pfx_worker_thread+0x10/0x10 [ 12.214186][ T67] ? __pfx_worker_thread+0x10/0x10 [ 12.214339][ T67] kthread+0x28a/0x350 [ 12.214441][ T67] ? __pfx_kthread+0x10/0x10 [ 12.214583][ T67] ret_from_fork+0x31/0x70 [ 12.214720][ T67] ? __pfx_kthread+0x10/0x10 [ 12.214852][ T67] ret_from_fork_asm+0x1a/0x30 [ 12.214987][ T67] [ 12.215088][ T67] [ 12.215158][ T67] Allocated by task 227: [ 12.215281][ T67] kasan_save_stack+0x24/0x50 [ 12.215492][ T67] kasan_save_track+0x14/0x30 [ 12.215628][ T67] __kasan_slab_alloc+0x59/0x70 [ 12.215761][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 12.215915][ T67] copy_net_ns+0xc6/0x340 [ 12.216020][ T67] create_new_namespaces+0x35f/0x920 [ 12.216163][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 12.216314][ T67] ksys_unshare+0x2a9/0x660 [ 12.216482][ T67] __x64_sys_unshare+0x31/0x40 [ 12.216615][ T67] do_syscall_64+0xc1/0x1d0 [ 12.216749][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.216915][ T67] [ 12.216984][ T67] Freed by task 67: [ 12.217083][ T67] kasan_save_stack+0x24/0x50 [ 12.217222][ T67] kasan_save_track+0x14/0x30 [ 12.217364][ T67] kasan_save_free_info+0x3b/0x60 [ 12.217496][ T67] __kasan_slab_free+0x38/0x50 [ 12.217648][ T67] kmem_cache_free+0xf8/0x330 [ 12.217784][ T67] cleanup_net+0x5a8/0xa40 [ 12.217933][ T67] process_one_work+0xe55/0x16d0 [ 12.218080][ T67] worker_thread+0x58c/0xce0 [ 12.218241][ T67] kthread+0x28a/0x350 [ 12.218365][ T67] ret_from_fork+0x31/0x70 [ 12.218510][ T67] ret_from_fork_asm+0x1a/0x30 [ 12.218647][ T67] [ 12.218717][ T67] The buggy address belongs to the object at ffff888008c90040 [ 12.218717][ T67] which belongs to the cache net_namespace of size 5696 [ 12.219093][ T67] The buggy address is located 184 bytes inside of [ 12.219093][ T67] freed 5696-byte region [ffff888008c90040, ffff888008c91680) [ 12.219447][ T67] [ 12.219514][ T67] The buggy address belongs to the physical page: [ 12.219679][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888008c92fc0 pfn:0x8c90 [ 12.219940][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 12.220138][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 12.220357][ T67] page_type: f5(slab) [ 12.220483][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 12.220714][ T67] raw: ffff888008c92fc0 0000000000050002 00000001f5000000 0000000000000000 [ 12.220943][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 12.221172][ T67] head: ffff888008c92fc0 0000000000050002 00000001f5000000 0000000000000000 [ 12.221401][ T67] head: 0080000000000003 ffffea0000232401 ffffffffffffffff 0000000000000000 [ 12.221628][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 12.221851][ T67] page dumped because: kasan: bad access detected [ 12.222023][ T67] [ 12.222092][ T67] Memory state around the buggy address: [ 12.222232][ T67] ffff888008c8ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.222456][ T67] ffff888008c90000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 12.222691][ T67] >ffff888008c90080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.222954][ T67] ^ [ 12.223198][ T67] ffff888008c90100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.223454][ T67] ffff888008c90180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.223665][ T67] ================================================================== [ 12.223910][ T67] Disabling lock debugging due to kernel taint [ 16.594654][ C2] TCP: TCP-AO: the keyid 100 from SYN packet is not present - not sending SYNACK