[ 11.097896][ T67] ================================================================== [ 11.098146][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.098369][ T67] Read of size 8 at addr ffff88800a9900f8 by task kworker/u16:1/67 [ 11.098572][ T67] [ 11.098646][ T67] CPU: 1 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.098855][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.099030][ T67] Workqueue: netns cleanup_net [ 11.099185][ T67] Call Trace: [ 11.099294][ T67] [ 11.099370][ T67] dump_stack_lvl+0x82/0xd0 [ 11.099516][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 11.099697][ T67] ? cleanup_net+0x932/0xa40 [ 11.099840][ T67] print_report+0xb4/0x270 [ 11.099979][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 11.100116][ T67] kasan_report+0xbd/0xf0 [ 11.100224][ T67] ? cleanup_net+0x932/0xa40 [ 11.100367][ T67] cleanup_net+0x932/0xa40 [ 11.100506][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.100647][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 11.100784][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 11.100923][ T67] ? lock_acquire+0x32/0xc0 [ 11.101068][ T67] ? process_one_work+0xe0b/0x16d0 [ 11.101211][ T67] process_one_work+0xe55/0x16d0 [ 11.101357][ T67] ? __pfx___lock_release+0x10/0x10 [ 11.101495][ T67] ? __pfx_process_one_work+0x10/0x10 [ 11.101640][ T67] ? assign_work+0x16c/0x240 [ 11.101783][ T67] worker_thread+0x58c/0xce0 [ 11.101924][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.102100][ T67] ? __pfx_worker_thread+0x10/0x10 [ 11.102240][ T67] ? __pfx_worker_thread+0x10/0x10 [ 11.102378][ T67] kthread+0x28a/0x350 [ 11.102485][ T67] ? __pfx_kthread+0x10/0x10 [ 11.102630][ T67] ret_from_fork+0x31/0x70 [ 11.102771][ T67] ? __pfx_kthread+0x10/0x10 [ 11.102911][ T67] ret_from_fork_asm+0x1a/0x30 [ 11.103066][ T67] [ 11.103175][ T67] [ 11.103248][ T67] Allocated by task 227: [ 11.103354][ T67] kasan_save_stack+0x24/0x50 [ 11.103498][ T67] kasan_save_track+0x14/0x30 [ 11.103635][ T67] __kasan_slab_alloc+0x59/0x70 [ 11.103770][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.103912][ T67] copy_net_ns+0xc6/0x340 [ 11.104018][ T67] create_new_namespaces+0x35f/0x920 [ 11.104159][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.104300][ T67] ksys_unshare+0x2a9/0x660 [ 11.104441][ T67] __x64_sys_unshare+0x31/0x40 [ 11.104579][ T67] do_syscall_64+0xc1/0x1d0 [ 11.104720][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.104893][ T67] [ 11.104963][ T67] Freed by task 67: [ 11.105068][ T67] kasan_save_stack+0x24/0x50 [ 11.105207][ T67] kasan_save_track+0x14/0x30 [ 11.105345][ T67] kasan_save_free_info+0x3b/0x60 [ 11.105485][ T67] __kasan_slab_free+0x38/0x50 [ 11.105630][ T67] kmem_cache_free+0xf8/0x330 [ 11.105767][ T67] cleanup_net+0x5a8/0xa40 [ 11.105908][ T67] process_one_work+0xe55/0x16d0 [ 11.106047][ T67] worker_thread+0x58c/0xce0 [ 11.106181][ T67] kthread+0x28a/0x350 [ 11.106297][ T67] ret_from_fork+0x31/0x70 [ 11.106434][ T67] ret_from_fork_asm+0x1a/0x30 [ 11.106570][ T67] [ 11.106639][ T67] The buggy address belongs to the object at ffff88800a990040 [ 11.106639][ T67] which belongs to the cache net_namespace of size 5696 [ 11.107015][ T67] The buggy address is located 184 bytes inside of [ 11.107015][ T67] freed 5696-byte region [ffff88800a990040, ffff88800a991680) [ 11.107351][ T67] [ 11.107421][ T67] The buggy address belongs to the physical page: [ 11.107586][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a992fc0 pfn:0xa990 [ 11.107860][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.108066][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.108250][ T67] page_type: f5(slab) [ 11.108362][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.108606][ T67] raw: ffff88800a992fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.108845][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.109083][ T67] head: ffff88800a992fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.109319][ T67] head: 0080000000000003 ffffea00002a6401 ffffffffffffffff 0000000000000000 [ 11.109568][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.109804][ T67] page dumped because: kasan: bad access detected [ 11.109971][ T67] [ 11.110042][ T67] Memory state around the buggy address: [ 11.110181][ T67] ffff88800a98ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.110384][ T67] ffff88800a990000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.110580][ T67] >ffff88800a990080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.110782][ T67] ^ [ 11.110988][ T67] ffff88800a990100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.111185][ T67] ffff88800a990180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.111381][ T67] ================================================================== [ 11.111668][ T67] Disabling lock debugging due to kernel taint