[ 37.956648][ T12] ==================================================================
[ 37.956955][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 37.957213][ T12] Read of size 1 at addr ffff88800f1b46ac by task kworker/u16:0/12
[ 37.957468][ T12]
[ 37.957562][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 37.957568][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 37.957570][ T12] Workqueue: netns cleanup_net
[ 37.957577][ T12] Call Trace:
[ 37.957579][ T12]
[ 37.957582][ T12] dump_stack_lvl+0x82/0xc0
[ 37.957587][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 37.957596][ T12] ? kobject_put+0xbb/0xd0
[ 37.957600][ T12] print_report+0xb4/0x270
[ 37.957604][ T12] ? kobject_put+0xbb/0xd0
[ 37.957607][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 37.957610][ T12] ? kobject_put+0xbb/0xd0
[ 37.957614][ T12] kasan_report+0xca/0x100
[ 37.957618][ T12] ? kobject_put+0xbb/0xd0
[ 37.957624][ T12] kobject_put+0xbb/0xd0
[ 37.957628][ T12] netdev_run_todo+0x5f0/0xc60
[ 37.957634][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 37.957638][ T12] ? generic_xdp_install+0x410/0x410
[ 37.957645][ T12] ops_undo_list+0x714/0x890
[ 37.957652][ T12] ? netns_get+0x110/0x110
[ 37.957656][ T12] ? cleanup_net+0x2d6/0x830
[ 37.957661][ T12] cleanup_net+0x3b2/0x830
[ 37.957665][ T12] ? net_passive_dec+0x190/0x190
[ 37.957668][ T12] ? rcu_is_watching+0x12/0xb0
[ 37.957675][ T12] process_one_work+0xe35/0x1650
[ 37.957684][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 37.957690][ T12] ? assign_work+0x168/0x240
[ 37.957694][ T12] worker_thread+0x591/0xcf0
[ 37.957700][ T12] ? rescuer_thread+0xd10/0xd10
[ 37.957704][ T12] kthread+0x37b/0x5f0
[ 37.957708][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 37.957711][ T12] ? ret_from_fork+0x1b/0x270
[ 37.957717][ T12] ? __lock_release+0x5d/0x170
[ 37.957723][ T12] ? rcu_is_watching+0x12/0xb0
[ 37.957726][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 37.957729][ T12] ret_from_fork+0x1db/0x270
[ 37.957732][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 37.957735][ T12] ret_from_fork_asm+0x11/0x20
[ 37.957744][ T12]
[ 37.957745][ T12]
[ 37.964122][ T12] Allocated by task 326:
[ 37.964249][ T12] kasan_save_stack+0x24/0x40
[ 37.964419][ T12] kasan_save_track+0x14/0x30
[ 37.964592][ T12] __kasan_kmalloc+0x7b/0x90
[ 37.964760][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 37.964929][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 37.965099][ T12] sit_init_net+0x169/0x550
[ 37.965272][ T12] ops_init+0x189/0x550
[ 37.965401][ T12] setup_net+0xf1/0x380
[ 37.965527][ T12] copy_net_ns+0x21a/0x380
[ 37.965700][ T12] create_new_namespaces+0x35f/0x900
[ 37.965867][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 37.966037][ T12] ksys_unshare+0x2a3/0x660
[ 37.966204][ T12] __x64_sys_unshare+0x31/0x40
[ 37.966379][ T12] do_syscall_64+0xc1/0xfd0
[ 37.966556][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 37.966767][ T12]
[ 37.966862][ T12] Freed by task 12:
[ 37.966988][ T12] kasan_save_stack+0x24/0x40
[ 37.967159][ T12] kasan_save_track+0x14/0x30
[ 37.967329][ T12] __kasan_save_free_info+0x3b/0x60
[ 37.967495][ T12] __kasan_slab_free+0x3f/0x60
[ 37.967667][ T12] kfree+0x21d/0x540
[ 37.967792][ T12] device_release+0x9c/0x210
[ 37.967967][ T12] kobject_cleanup+0xfe/0x360
[ 37.968135][ T12] netdev_run_todo+0x81f/0xc60
[ 37.968301][ T12] ops_undo_list+0x714/0x890
[ 37.968469][ T12] cleanup_net+0x3b2/0x830
[ 37.968638][ T12] process_one_work+0xe35/0x1650
[ 37.968808][ T12] worker_thread+0x591/0xcf0
[ 37.968978][ T12] kthread+0x37b/0x5f0
[ 37.969104][ T12] ret_from_fork+0x1db/0x270
[ 37.969269][ T12] ret_from_fork_asm+0x11/0x20
[ 37.969438][ T12]
[ 37.969528][ T12] The buggy address belongs to the object at ffff88800f1b4000
[ 37.969528][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 37.969936][ T12] The buggy address is located 1708 bytes inside of
[ 37.969936][ T12] freed 4096-byte region [ffff88800f1b4000, ffff88800f1b5000)
[ 37.970349][ T12]
[ 37.970442][ T12] The buggy address belongs to the physical page:
[ 37.970649][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800f1b1000 pfn:0xf1b0
[ 37.970990][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 37.971243][ T12] flags: 0x80000000000240(workingset|head|node=0|zone=1)
[ 37.971459][ T12] page_type: f5(slab)
[ 37.971601][ T12] raw: 0080000000000240 ffff888001043700 ffffea00003c7010 ffff8880010410c8
[ 37.971901][ T12] raw: ffff88800f1b1000 0000000000020001 00000000f5000000 0000000000000000
[ 37.972198][ T12] head: 0080000000000240 ffff888001043700 ffffea00003c7010 ffff8880010410c8
[ 37.972503][ T12] head: ffff88800f1b1000 0000000000020001 00000000f5000000 0000000000000000
[ 37.972800][ T12] head: 0080000000000003 ffffea00003c6c01 00000000ffffffff 00000000ffffffff
[ 37.973100][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 37.973390][ T12] page dumped because: kasan: bad access detected
[ 37.973598][ T12]
[ 37.973680][ T12] Memory state around the buggy address:
[ 37.973840][ T12] ffff88800f1b4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 37.974087][ T12] ffff88800f1b4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 37.974327][ T12] >ffff88800f1b4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 37.974568][ T12] ^
[ 37.974730][ T12] ffff88800f1b4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 37.974970][ T12] ffff88800f1b4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 37.975213][ T12] ==================================================================
[ 37.975815][ T12] Disabling lock debugging due to kernel taint
[ 37.976030][ T12] ------------[ cut here ]------------
[ 37.976189][ T12] refcount_t: underflow; use-after-free.
[ 37.976385][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 37.976688][ T12] Modules linked in: veth nf_tables
[ 37.976874][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 37.977252][ T12] Tainted: [B]=BAD_PAGE
[ 37.977383][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 37.977606][ T12] Workqueue: netns cleanup_net
[ 37.977797][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 37.978026][ T12] Code: 83 90 02 80 fb 01 0f 87 95 6b d6 fe 83 e3 01 0f 85 51 ff ff ff c6 05 b1 83 90 02 01 90 48 c7 c7 a0 de e5 84 e8 c2 8b 15 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 f0 34 a1 ff e9 ba fe ff ff
[ 37.978620][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 37.978841][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 37.979093][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 37.979346][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0afe220
[ 37.979604][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 37.979869][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 37.980129][ T12] FS: 0000000000000000(0000) GS:ffff8880a9bec000(0000) knlGS:0000000000000000
[ 37.980418][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 37.980641][ T12] CR2: 000055fcdb184dec CR3: 0000000036935005 CR4: 0000000000772ef0
[ 37.980908][ T12] PKRU: 55555554
[ 37.981041][ T12] Call Trace:
[ 37.981172][ T12]
[ 37.981258][ T12] netdev_run_todo+0x5f0/0xc60
[ 37.981426][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 37.981594][ T12] ? generic_xdp_install+0x410/0x410
[ 37.981758][ T12] ops_undo_list+0x714/0x890
[ 37.981936][ T12] ? netns_get+0x110/0x110
[ 37.982097][ T12] ? cleanup_net+0x2d6/0x830
[ 37.982275][ T12] cleanup_net+0x3b2/0x830
[ 37.982446][ T12] ? net_passive_dec+0x190/0x190
[ 37.982616][ T12] ? rcu_is_watching+0x12/0xb0
[ 37.982788][ T12] process_one_work+0xe35/0x1650
[ 37.982956][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 37.983123][ T12] ? assign_work+0x168/0x240
[ 37.983290][ T12] worker_thread+0x591/0xcf0
[ 37.983464][ T12] ? rescuer_thread+0xd10/0xd10
[ 37.983638][ T12] kthread+0x37b/0x5f0
[ 37.983767][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 37.983945][ T12] ? ret_from_fork+0x1b/0x270
[ 37.984204][ T12] ? __lock_release+0x5d/0x170
[ 37.984372][ T12] ? rcu_is_watching+0x12/0xb0
[ 37.984544][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 37.984719][ T12] ret_from_fork+0x1db/0x270
[ 37.984980][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 37.985149][ T12] ret_from_fork_asm+0x11/0x20
[ 37.985322][ T12]
[ 37.985460][ T12] irq event stamp: 4951
[ 37.985589][ T12] hardirqs last enabled at (4951): [] finish_task_switch.isra.0+0x245/0x960
[ 37.986012][ T12] hardirqs last disabled at (4950): [] __schedule+0x94a/0x1b10
[ 37.986308][ T12] softirqs last enabled at (4086): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 37.986724][ T12] softirqs last disabled at (4084): [] dev_mc_flush+0x54/0x90
[ 37.987011][ T12] ---[ end trace 0000000000000000 ]---
[ 651.393565][T12645] nft (12645) used greatest stack depth: 23872 bytes left