[ 11.557082][ T67] ================================================================== [ 11.557329][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.557543][ T67] Read of size 8 at addr ffff8880024580f8 by task kworker/u16:1/67 [ 11.557743][ T67] [ 11.557821][ T67] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.558033][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.558227][ T67] Workqueue: netns cleanup_net [ 11.558376][ T67] Call Trace: [ 11.558492][ T67] [ 11.558570][ T67] dump_stack_lvl+0x82/0xd0 [ 11.558718][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 11.558891][ T67] ? cleanup_net+0x932/0xa40 [ 11.559044][ T67] print_report+0xb4/0x270 [ 11.559175][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 11.559313][ T67] kasan_report+0xbd/0xf0 [ 11.559414][ T67] ? cleanup_net+0x932/0xa40 [ 11.559544][ T67] cleanup_net+0x932/0xa40 [ 11.559677][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.559816][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 11.559957][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 11.560123][ T67] ? lock_acquire+0x32/0xc0 [ 11.560256][ T67] ? process_one_work+0xe0b/0x16d0 [ 11.560394][ T67] process_one_work+0xe55/0x16d0 [ 11.560530][ T67] ? __pfx___lock_release+0x10/0x10 [ 11.560679][ T67] ? __pfx_process_one_work+0x10/0x10 [ 11.560818][ T67] ? assign_work+0x16c/0x240 [ 11.560982][ T67] worker_thread+0x58c/0xce0 [ 11.561123][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.561289][ T67] ? __pfx_worker_thread+0x10/0x10 [ 11.561418][ T67] ? __pfx_worker_thread+0x10/0x10 [ 11.561545][ T67] kthread+0x28a/0x350 [ 11.561649][ T67] ? __pfx_kthread+0x10/0x10 [ 11.561785][ T67] ret_from_fork+0x31/0x70 [ 11.561925][ T67] ? __pfx_kthread+0x10/0x10 [ 11.562081][ T67] ret_from_fork_asm+0x1a/0x30 [ 11.562221][ T67] [ 11.562323][ T67] [ 11.562391][ T67] Allocated by task 228: [ 11.562493][ T67] kasan_save_stack+0x24/0x50 [ 11.562628][ T67] kasan_save_track+0x14/0x30 [ 11.562759][ T67] __kasan_slab_alloc+0x59/0x70 [ 11.562892][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.563035][ T67] copy_net_ns+0xc6/0x340 [ 11.563133][ T67] create_new_namespaces+0x35f/0x920 [ 11.563267][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.563401][ T67] ksys_unshare+0x2a9/0x660 [ 11.563533][ T67] __x64_sys_unshare+0x31/0x40 [ 11.563664][ T67] do_syscall_64+0xc1/0x1d0 [ 11.563802][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.563975][ T67] [ 11.564047][ T67] Freed by task 67: [ 11.564142][ T67] kasan_save_stack+0x24/0x50 [ 11.564276][ T67] kasan_save_track+0x14/0x30 [ 11.564402][ T67] kasan_save_free_info+0x3b/0x60 [ 11.564535][ T67] __kasan_slab_free+0x38/0x50 [ 11.564671][ T67] kmem_cache_free+0xf8/0x330 [ 11.564811][ T67] cleanup_net+0x5a8/0xa40 [ 11.564963][ T67] process_one_work+0xe55/0x16d0 [ 11.565095][ T67] worker_thread+0x58c/0xce0 [ 11.565222][ T67] kthread+0x28a/0x350 [ 11.565332][ T67] ret_from_fork+0x31/0x70 [ 11.565470][ T67] ret_from_fork_asm+0x1a/0x30 [ 11.565609][ T67] [ 11.565692][ T67] The buggy address belongs to the object at ffff888002458040 [ 11.565692][ T67] which belongs to the cache net_namespace of size 5696 [ 11.566104][ T67] The buggy address is located 184 bytes inside of [ 11.566104][ T67] freed 5696-byte region [ffff888002458040, ffff888002459680) [ 11.566435][ T67] [ 11.566507][ T67] The buggy address belongs to the physical page: [ 11.566671][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800245afc0 pfn:0x2458 [ 11.566968][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.567177][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.567375][ T67] page_type: f5(slab) [ 11.567499][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.567740][ T67] raw: ffff88800245afc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.567978][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.568212][ T67] head: ffff88800245afc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.568440][ T67] head: 0080000000000003 ffffea0000091601 ffffffffffffffff 0000000000000000 [ 11.568676][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.568934][ T67] page dumped because: kasan: bad access detected [ 11.569107][ T67] [ 11.569170][ T67] Memory state around the buggy address: [ 11.569296][ T67] ffff888002457f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 11.569497][ T67] ffff888002458000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.569681][ T67] >ffff888002458080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.569869][ T67] ^ [ 11.570086][ T67] ffff888002458100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.570277][ T67] ffff888002458180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.570465][ T67] ================================================================== [ 11.570704][ T67] Disabling lock debugging due to kernel taint