[ 10.500440][ T66] ================================================================== [ 10.500704][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.500919][ T66] Read of size 8 at addr ffff8880097500f8 by task kworker/u16:1/66 [ 10.501128][ T66] [ 10.501223][ T66] CPU: 3 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.501441][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.501622][ T66] Workqueue: netns cleanup_net [ 10.501778][ T66] Call Trace: [ 10.501888][ T66] [ 10.501962][ T66] dump_stack_lvl+0x82/0xd0 [ 10.502119][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 10.502302][ T66] ? cleanup_net+0x932/0xa40 [ 10.502448][ T66] print_report+0xb4/0x270 [ 10.502594][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 10.502747][ T66] kasan_report+0xbd/0xf0 [ 10.502857][ T66] ? cleanup_net+0x932/0xa40 [ 10.502998][ T66] cleanup_net+0x932/0xa40 [ 10.503137][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.503281][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 10.503435][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 10.503565][ T66] ? lock_acquire+0x32/0xc0 [ 10.503689][ T66] ? process_one_work+0xe0b/0x16d0 [ 10.503817][ T66] process_one_work+0xe55/0x16d0 [ 10.503943][ T66] ? __pfx___lock_release+0x10/0x10 [ 10.504076][ T66] ? __pfx_process_one_work+0x10/0x10 [ 10.504203][ T66] ? assign_work+0x16c/0x240 [ 10.504331][ T66] worker_thread+0x58c/0xce0 [ 10.504460][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.504616][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.504740][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.504862][ T66] kthread+0x28a/0x350 [ 10.504959][ T66] ? __pfx_kthread+0x10/0x10 [ 10.505086][ T66] ret_from_fork+0x31/0x70 [ 10.505210][ T66] ? __pfx_kthread+0x10/0x10 [ 10.505339][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.505476][ T66] [ 10.505571][ T66] [ 10.505638][ T66] Allocated by task 226: [ 10.505741][ T66] kasan_save_stack+0x24/0x50 [ 10.505869][ T66] kasan_save_track+0x14/0x30 [ 10.505995][ T66] __kasan_slab_alloc+0x59/0x70 [ 10.506119][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.506248][ T66] copy_net_ns+0xc6/0x340 [ 10.506346][ T66] create_new_namespaces+0x35f/0x920 [ 10.506474][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.506600][ T66] ksys_unshare+0x2a9/0x660 [ 10.506730][ T66] __x64_sys_unshare+0x31/0x40 [ 10.506857][ T66] do_syscall_64+0xc1/0x1d0 [ 10.506987][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.507147][ T66] [ 10.507212][ T66] Freed by task 66: [ 10.507315][ T66] kasan_save_stack+0x24/0x50 [ 10.507443][ T66] kasan_save_track+0x14/0x30 [ 10.507566][ T66] kasan_save_free_info+0x3b/0x60 [ 10.507690][ T66] __kasan_slab_free+0x38/0x50 [ 10.507813][ T66] kmem_cache_free+0xf8/0x330 [ 10.507940][ T66] cleanup_net+0x5a8/0xa40 [ 10.508065][ T66] process_one_work+0xe55/0x16d0 [ 10.508187][ T66] worker_thread+0x58c/0xce0 [ 10.508316][ T66] kthread+0x28a/0x350 [ 10.508414][ T66] ret_from_fork+0x31/0x70 [ 10.508539][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.508664][ T66] [ 10.508727][ T66] The buggy address belongs to the object at ffff888009750040 [ 10.508727][ T66] which belongs to the cache net_namespace of size 5696 [ 10.509049][ T66] The buggy address is located 184 bytes inside of [ 10.509049][ T66] freed 5696-byte region [ffff888009750040, ffff888009751680) [ 10.509352][ T66] [ 10.509418][ T66] The buggy address belongs to the physical page: [ 10.509569][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888009752fc0 pfn:0x9750 [ 10.509830][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.510021][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.510181][ T66] page_type: f5(slab) [ 10.510282][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.510503][ T66] raw: ffff888009752fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.510737][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.510965][ T66] head: ffff888009752fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.511185][ T66] head: 0080000000000003 ffffea000025d401 ffffffffffffffff 0000000000000000 [ 10.511408][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.511637][ T66] page dumped because: kasan: bad access detected [ 10.511807][ T66] [ 10.511876][ T66] Memory state around the buggy address: [ 10.511999][ T66] ffff88800974ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.512183][ T66] ffff888009750000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.512363][ T66] >ffff888009750080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.512547][ T66] ^ [ 10.512747][ T66] ffff888009750100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.512936][ T66] ffff888009750180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.513111][ T66] ================================================================== [ 10.513312][ T66] Disabling lock debugging due to kernel taint