[ 10.527241][ T67] ================================================================== [ 10.527471][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.527737][ T67] Read of size 8 at addr ffff88800b9200f8 by task kworker/u16:1/67 [ 10.528010][ T67] [ 10.528118][ T67] CPU: 1 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.528399][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.528620][ T67] Workqueue: netns cleanup_net [ 10.528841][ T67] Call Trace: [ 10.528982][ T67] [ 10.529078][ T67] dump_stack_lvl+0x82/0xd0 [ 10.529268][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 10.529497][ T67] ? cleanup_net+0x932/0xa40 [ 10.529687][ T67] print_report+0xb4/0x270 [ 10.529872][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 10.530057][ T67] kasan_report+0xbd/0xf0 [ 10.530213][ T67] ? cleanup_net+0x932/0xa40 [ 10.530405][ T67] cleanup_net+0x932/0xa40 [ 10.530607][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.530801][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 10.530992][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 10.531191][ T67] ? lock_acquire+0x32/0xc0 [ 10.531368][ T67] ? process_one_work+0xe0b/0x16d0 [ 10.531561][ T67] process_one_work+0xe55/0x16d0 [ 10.531756][ T67] ? __pfx___lock_release+0x10/0x10 [ 10.531938][ T67] ? __pfx_process_one_work+0x10/0x10 [ 10.532129][ T67] ? assign_work+0x16c/0x240 [ 10.532311][ T67] worker_thread+0x58c/0xce0 [ 10.532492][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.532723][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.532904][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.533096][ T67] kthread+0x28a/0x350 [ 10.533241][ T67] ? __pfx_kthread+0x10/0x10 [ 10.533432][ T67] ret_from_fork+0x31/0x70 [ 10.533611][ T67] ? __pfx_kthread+0x10/0x10 [ 10.533784][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.533967][ T67] [ 10.534092][ T67] [ 10.534180][ T67] Allocated by task 225: [ 10.534319][ T67] kasan_save_stack+0x24/0x50 [ 10.534491][ T67] kasan_save_track+0x14/0x30 [ 10.534669][ T67] __kasan_slab_alloc+0x59/0x70 [ 10.534837][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.534999][ T67] copy_net_ns+0xc6/0x340 [ 10.535123][ T67] create_new_namespaces+0x35f/0x920 [ 10.535295][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.535464][ T67] ksys_unshare+0x2a9/0x660 [ 10.535636][ T67] __x64_sys_unshare+0x31/0x40 [ 10.535804][ T67] do_syscall_64+0xc1/0x1d0 [ 10.535976][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.536188][ T67] [ 10.536274][ T67] Freed by task 67: [ 10.536400][ T67] kasan_save_stack+0x24/0x50 [ 10.536575][ T67] kasan_save_track+0x14/0x30 [ 10.536741][ T67] kasan_save_free_info+0x3b/0x60 [ 10.536911][ T67] __kasan_slab_free+0x38/0x50 [ 10.537098][ T67] kmem_cache_free+0xf8/0x330 [ 10.537264][ T67] cleanup_net+0x5a8/0xa40 [ 10.537430][ T67] process_one_work+0xe55/0x16d0 [ 10.537589][ T67] worker_thread+0x58c/0xce0 [ 10.537746][ T67] kthread+0x28a/0x350 [ 10.537875][ T67] ret_from_fork+0x31/0x70 [ 10.538038][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.538217][ T67] [ 10.538301][ T67] The buggy address belongs to the object at ffff88800b920040 [ 10.538301][ T67] which belongs to the cache net_namespace of size 5696 [ 10.538725][ T67] The buggy address is located 184 bytes inside of [ 10.538725][ T67] freed 5696-byte region [ffff88800b920040, ffff88800b921680) [ 10.539107][ T67] [ 10.539192][ T67] The buggy address belongs to the physical page: [ 10.539385][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b922fc0 pfn:0xb920 [ 10.539709][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.539950][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.540150][ T67] page_type: f5(slab) [ 10.540281][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.540565][ T67] raw: ffff88800b922fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.540858][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.541142][ T67] head: ffff88800b922fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.541434][ T67] head: 0080000000000003 ffffea00002e4801 ffffffffffffffff 0000000000000000 [ 10.541711][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.542031][ T67] page dumped because: kasan: bad access detected [ 10.542231][ T67] [ 10.542313][ T67] Memory state around the buggy address: [ 10.542500][ T67] ffff88800b91ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.542748][ T67] ffff88800b920000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.542980][ T67] >ffff88800b920080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.543240][ T67] ^ [ 10.543469][ T67] ffff88800b920100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.543712][ T67] ffff88800b920180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.543960][ T67] ================================================================== [ 10.544303][ T67] Disabling lock debugging due to kernel taint