[ 47.773318][ T392] ip (392) used greatest stack depth: 24048 bytes left [ 71.858131][ T66] ================================================================== [ 71.858355][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 71.858545][ T66] Read of size 8 at addr ffff88800a6080f8 by task kworker/u16:1/66 [ 71.858726][ T66] [ 71.858789][ T66] CPU: 2 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 71.858981][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 71.859138][ T66] Workqueue: netns cleanup_net [ 71.859269][ T66] Call Trace: [ 71.859362][ T66] [ 71.859428][ T66] dump_stack_lvl+0x82/0xd0 [ 71.859561][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 71.859718][ T66] ? cleanup_net+0xa5d/0xb90 [ 71.859844][ T66] print_report+0xb4/0x270 [ 71.859965][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 71.860090][ T66] kasan_report+0xbd/0xf0 [ 71.860184][ T66] ? cleanup_net+0xa5d/0xb90 [ 71.860309][ T66] cleanup_net+0xa5d/0xb90 [ 71.860434][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 71.860564][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 71.860686][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 71.860810][ T66] ? lock_acquire+0x32/0xc0 [ 71.860933][ T66] ? process_one_work+0xe0b/0x16d0 [ 71.861063][ T66] process_one_work+0xe55/0x16d0 [ 71.861190][ T66] ? __pfx___lock_release+0x10/0x10 [ 71.861312][ T66] ? __pfx_process_one_work+0x10/0x10 [ 71.861435][ T66] ? assign_work+0x16c/0x240 [ 71.861558][ T66] worker_thread+0x58c/0xce0 [ 71.861683][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 71.861837][ T66] ? __pfx_worker_thread+0x10/0x10 [ 71.861969][ T66] ? __pfx_worker_thread+0x10/0x10 [ 71.862093][ T66] kthread+0x28a/0x350 [ 71.862190][ T66] ? __pfx_kthread+0x10/0x10 [ 71.862312][ T66] ret_from_fork+0x31/0x70 [ 71.862436][ T66] ? __pfx_kthread+0x10/0x10 [ 71.862562][ T66] ret_from_fork_asm+0x1a/0x30 [ 71.862692][ T66] [ 71.862784][ T66] [ 71.862845][ T66] Allocated by task 330: [ 71.862937][ T66] kasan_save_stack+0x24/0x50 [ 71.863062][ T66] kasan_save_track+0x14/0x30 [ 71.863181][ T66] __kasan_slab_alloc+0x59/0x70 [ 71.863300][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 71.863422][ T66] copy_net_ns+0xc6/0x540 [ 71.863519][ T66] create_new_namespaces+0x35f/0x920 [ 71.863645][ T66] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 71.863770][ T66] ksys_unshare+0x2c4/0x6e0 [ 71.863897][ T66] __x64_sys_unshare+0x31/0x40 [ 71.864022][ T66] do_syscall_64+0xc1/0x1d0 [ 71.864146][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 71.864298][ T66] [ 71.864362][ T66] Freed by task 66: [ 71.864456][ T66] kasan_save_stack+0x24/0x50 [ 71.864581][ T66] kasan_save_track+0x14/0x30 [ 71.864703][ T66] kasan_save_free_info+0x3b/0x60 [ 71.864829][ T66] __kasan_slab_free+0x38/0x50 [ 71.864950][ T66] kmem_cache_free+0xf8/0x330 [ 71.865073][ T66] cleanup_net+0x5a8/0xb90 [ 71.865194][ T66] process_one_work+0xe55/0x16d0 [ 71.865318][ T66] worker_thread+0x58c/0xce0 [ 71.865440][ T66] kthread+0x28a/0x350 [ 71.865534][ T66] ret_from_fork+0x31/0x70 [ 71.865653][ T66] ret_from_fork_asm+0x1a/0x30 [ 71.865774][ T66] [ 71.865838][ T66] The buggy address belongs to the object at ffff88800a608040 [ 71.865838][ T66] which belongs to the cache net_namespace of size 6528 [ 71.866157][ T66] The buggy address is located 184 bytes inside of [ 71.866157][ T66] freed 6528-byte region [ffff88800a608040, ffff88800a6099c0) [ 71.866456][ T66] [ 71.866519][ T66] The buggy address belongs to the physical page: [ 71.866668][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa608 [ 71.866887][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 71.867069][ T66] flags: 0x80000000000040(head|node=0|zone=1) [ 71.867225][ T66] page_type: f5(slab) [ 71.867323][ T66] raw: 0080000000000040 ffff888001975240 ffff88800197a0a8 ffff88800197a0a8 [ 71.867543][ T66] raw: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 [ 71.867757][ T66] head: 0080000000000040 ffff888001975240 ffff88800197a0a8 ffff88800197a0a8 [ 71.867971][ T66] head: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 [ 71.868186][ T66] head: 0080000000000003 ffffea0000298201 ffffffffffffffff 0000000000000000 [ 71.868401][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 71.868615][ T66] page dumped because: kasan: bad access detected [ 71.868764][ T66] [ 71.868828][ T66] Memory state around the buggy address: [ 71.868949][ T66] ffff88800a607f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 71.869129][ T66] ffff88800a608000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 71.869307][ T66] >ffff88800a608080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 71.8694