[ 11.309072][ T270] ip (270) used greatest stack depth: 24192 bytes left [ 312.373739][ T11] ================================================================== [ 312.373971][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 312.374177][ T11] Read of size 8 at addr ffff88800c8000f8 by task kworker/u16:0/11 [ 312.374362][ T11] [ 312.374428][ T11] CPU: 1 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 312.374625][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 312.374783][ T11] Workqueue: netns cleanup_net [ 312.374916][ T11] Call Trace: [ 312.375014][ T11] <TASK> [ 312.375089][ T11] dump_stack_lvl+0x82/0xd0 [ 312.375222][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 312.375384][ T11] ? cleanup_net+0xa5d/0xb90 [ 312.375512][ T11] print_report+0xb4/0x270 [ 312.375695][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 312.375882][ T11] kasan_report+0xbd/0xf0 [ 312.376026][ T11] ? cleanup_net+0xa5d/0xb90 [ 312.376227][ T11] cleanup_net+0xa5d/0xb90 [ 312.376418][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 312.376614][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 312.376806][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 312.377001][ T11] ? lock_acquire+0x32/0xc0 [ 312.377194][ T11] ? process_one_work+0xe0b/0x16d0 [ 312.377389][ T11] process_one_work+0xe55/0x16d0 [ 312.377585][ T11] ? __pfx___lock_release+0x10/0x10 [ 312.377777][ T11] ? __pfx_process_one_work+0x10/0x10 [ 312.377979][ T11] ? assign_work+0x16c/0x240 [ 312.378172][ T11] worker_thread+0x58c/0xce0 [ 312.378372][ T11] ? __pfx_worker_thread+0x10/0x10 [ 312.378563][ T11] kthread+0x28a/0x350 [ 312.378712][ T11] ? __pfx_kthread+0x10/0x10 [ 312.378908][ T11] ret_from_fork+0x31/0x70 [ 312.379097][ T11] ? __pfx_kthread+0x10/0x10 [ 312.379290][ T11] ret_from_fork_asm+0x1a/0x30 [ 312.379494][ T11] </TASK> [ 312.379644][ T11] [ 312.379741][ T11] Allocated by task 261: [ 312.379886][ T11] kasan_save_stack+0x24/0x50 [ 312.380078][ T11] kasan_save_track+0x14/0x30 [ 312.380257][ T11] __kasan_slab_alloc+0x59/0x70 [ 312.380390][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 312.380518][ T11] copy_net_ns+0xc6/0x540 [ 312.380619][ T11] create_new_namespaces+0x35f/0x920 [ 312.380746][ T11] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 312.380873][ T11] ksys_unshare+0x2c4/0x6e0 [ 312.381014][ T11] __x64_sys_unshare+0x31/0x40 [ 312.381151][ T11] do_syscall_64+0xc1/0x1d0 [ 312.381282][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 312.381440][ T11] [ 312.381509][ T11] Freed by task 11: [ 312.381609][ T11] kasan_save_stack+0x24/0x50 [ 312.381734][ T11] kasan_save_track+0x14/0x30 [ 312.381860][ T11] kasan_save_free_info+0x3b/0x60 [ 312.381988][ T11] __kasan_slab_free+0x38/0x50 [ 312.382121][ T11] kmem_cache_free+0xf8/0x330 [ 312.382247][ T11] cleanup_net+0x5a8/0xb90 [ 312.382374][ T11] process_one_work+0xe55/0x16d0 [ 312.382501][ T11] worker_thread+0x58c/0xce0 [ 312.382651][ T11] kthread+0x28a/0x350 [ 312.382794][ T11] ret_from_fork+0x31/0x70 [ 312.382976][ T11] ret_from_fork_asm+0x1a/0x30 [ 312.383159][ T11] [ 312.383252][ T11] Last potentially related work creation: [ 312.383438][ T11] kasan_save_stack+0x24/0x50 [ 312.383641][ T11] __kasan_record_aux_stack+0x8e/0xa0 [ 312.383840][ T11] insert_work+0x34/0x230 [ 312.383988][ T11] __queue_work+0x5fd/0xa40 [ 312.384178][ T11] call_timer_fn+0x13b/0x230 [ 312.384374][ T11] __run_timers+0x3ff/0x810 [ 312.384570][ T11] run_timer_softirq+0x154/0x1c0 [ 312.384771][ T11] handle_softirqs+0x1f6/0x5c0 [ 312.384969][ T11] __irq_exit_rcu+0xc4/0x100 [ 312.385164][ T11] irq_exit_rcu+0xe/0x20 [ 312.385315][ T11] sysvec_apic_timer_interrupt+0x78/0x90 [ 312.385515][ T11] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 312.385757][ T11] [ 312.385856][ T11] Second to last potentially related work creation: [ 312.386085][ T11] kasan_save_stack+0x24/0x50 [ 312.386294][ T11] __kasan_record_aux_stack+0x8e/0xa0 [ 312.386474][ T11] insert_work+0x34/0x230 [ 312.386593][ T11] __queue_work+0x5fd/0xa40 [ 312.386720][ T11] call_timer_fn+0x13b/0x230 [ 312.386856][ T11] __run_timers+0x3ff/0x810 [ 312.386984][ T11] run_timer_softirq+0x154/0x1c0 [ 312.387122][ T11] handle_softirqs+0x1f6/0x5c0 [ 312.387249][ T11] __irq_exit_rcu+0xc4/0x100 [ 312.387382][ T11] irq_exit_rcu+0xe/0x20 [ 312.387480][ T11] sysvec_apic_timer_interrupt+0x78/0x90 [ 312.387609][ T11] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 312.387766][ T11] [ 312.387832][ T11] The buggy address belongs to the object at ffff88800c800040 [ 312.387832][ T11] which belongs to the cache net_namespace of size 6528 [ 312.388222][ T11] The buggy address is located 184 bytes inside of [ 312.388222][ T11] freed 6528-byte region [ffff88800c800040, ffff88800c8019c0) [ 312.388572][ T11] [ 312.388636][ T11] The buggy address belongs to the physical page: [ 312.388788][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800c803640 pfn:0xc800 [ 312.389048][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 312.389244][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 312.389407][ T11] page_type: f5(slab) [ 312.389507][ T11] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 312.389736][ T11] raw: ffff88800c803640 0000000000040002 00000001f5000000 0000000000000000 [ 312.389965][ T11] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 312.390200][ T11] head: ffff88800c803640 0000000000040002 00000001f5000000 0000000000000000 [ 312.390421][ T11] head: 0080000000000003 ffffea0000320001 ffffffffffffffff 0000000000000000 [ 312.390643][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 312.390863][ T11] page dumped because: kasan: bad access detected [ 312.391017][ T11] [ 312.391085][ T11] Memory state around the buggy address: [ 312.391213][ T11] ffff88800c7fff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 312.391396][ T11] ffff88800c800000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 312.391578][ T11] >ffff88800c800080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 312.391763][ T11] ^ [ 312.391943][ T11] ffff88800c800100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 312.392178][ T11] ffff88800c800180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 312.392379][ T11] ================================================================== [ 312.392589][ T11] Disabling lock debugging due to kernel taint