[ 50.695564][ T12] ==================================================================
[ 50.695942][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 50.696239][ T12] Read of size 1 at addr ffff888007ff96ac by task kworker/u16:0/12
[ 50.696504][ T12]
[ 50.696623][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 50.696631][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 50.696636][ T12] Workqueue: netns cleanup_net
[ 50.696649][ T12] Call Trace:
[ 50.696653][ T12]
[ 50.696656][ T12] dump_stack_lvl+0x82/0xc0
[ 50.696664][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 50.696683][ T12] ? kobject_put+0xbb/0xd0
[ 50.696688][ T12] print_report+0xb4/0x270
[ 50.696691][ T12] ? kobject_put+0xbb/0xd0
[ 50.696695][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 50.696699][ T12] ? kobject_put+0xbb/0xd0
[ 50.696702][ T12] kasan_report+0xca/0x100
[ 50.696707][ T12] ? kobject_put+0xbb/0xd0
[ 50.696712][ T12] kobject_put+0xbb/0xd0
[ 50.696716][ T12] netdev_run_todo+0x5f0/0xc60
[ 50.696723][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 50.696726][ T12] ? generic_xdp_install+0x410/0x410
[ 50.696733][ T12] ops_undo_list+0x714/0x890
[ 50.696742][ T12] ? netns_get+0x110/0x110
[ 50.696746][ T12] ? cleanup_net+0x2d6/0x830
[ 50.696751][ T12] cleanup_net+0x3b2/0x830
[ 50.696754][ T12] ? net_passive_dec+0x190/0x190
[ 50.696758][ T12] ? rcu_is_watching+0x12/0xb0
[ 50.696770][ T12] process_one_work+0xe35/0x1650
[ 50.696783][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 50.696789][ T12] ? assign_work+0x168/0x240
[ 50.696793][ T12] worker_thread+0x591/0xcf0
[ 50.696799][ T12] ? rescuer_thread+0xd10/0xd10
[ 50.696802][ T12] kthread+0x37b/0x5f0
[ 50.696807][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.696809][ T12] ? ret_from_fork+0x1b/0x270
[ 50.696826][ T12] ? __lock_release+0x5d/0x170
[ 50.696834][ T12] ? rcu_is_watching+0x12/0xb0
[ 50.696837][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.696841][ T12] ret_from_fork+0x1db/0x270
[ 50.696845][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.696848][ T12] ret_from_fork_asm+0x11/0x20
[ 50.696861][ T12]
[ 50.696862][ T12]
[ 50.703390][ T12] Allocated by task 252:
[ 50.703522][ T12] kasan_save_stack+0x24/0x40
[ 50.703700][ T12] kasan_save_track+0x14/0x30
[ 50.703868][ T12] __kasan_kmalloc+0x7b/0x90
[ 50.704041][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 50.704220][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 50.704398][ T12] sit_init_net+0x169/0x550
[ 50.704575][ T12] ops_init+0x189/0x550
[ 50.704705][ T12] setup_net+0xf1/0x380
[ 50.704833][ T12] copy_net_ns+0x21a/0x380
[ 50.705001][ T12] create_new_namespaces+0x35f/0x900
[ 50.705167][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 50.705339][ T12] ksys_unshare+0x2a3/0x660
[ 50.705512][ T12] __x64_sys_unshare+0x31/0x40
[ 50.705685][ T12] do_syscall_64+0xc1/0xfd0
[ 50.705860][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 50.706093][ T12]
[ 50.706182][ T12] Freed by task 12:
[ 50.706309][ T12] kasan_save_stack+0x24/0x40
[ 50.706579][ T12] kasan_save_track+0x14/0x30
[ 50.706750][ T12] __kasan_save_free_info+0x3b/0x60
[ 50.706912][ T12] __kasan_slab_free+0x3f/0x60
[ 50.707086][ T12] kfree+0x21d/0x540
[ 50.707303][ T12] device_release+0x9c/0x210
[ 50.707485][ T12] kobject_cleanup+0xfe/0x360
[ 50.707657][ T12] netdev_run_todo+0x81f/0xc60
[ 50.707823][ T12] ops_undo_list+0x714/0x890
[ 50.707997][ T12] cleanup_net+0x3b2/0x830
[ 50.708163][ T12] process_one_work+0xe35/0x1650
[ 50.708332][ T12] worker_thread+0x591/0xcf0
[ 50.708498][ T12] kthread+0x37b/0x5f0
[ 50.708721][ T12] ret_from_fork+0x1db/0x270
[ 50.708892][ T12] ret_from_fork_asm+0x11/0x20
[ 50.709063][ T12]
[ 50.709154][ T12] The buggy address belongs to the object at ffff888007ff9000
[ 50.709154][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 50.709650][ T12] The buggy address is located 1708 bytes inside of
[ 50.709650][ T12] freed 4096-byte region [ffff888007ff9000, ffff888007ffa000)
[ 50.710060][ T12]
[ 50.710232][ T12] The buggy address belongs to the physical page:
[ 50.710448][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ff8
[ 50.710754][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 50.711105][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 50.711333][ T12] page_type: f5(slab)
[ 50.711472][ T12] raw: 0080000000000040 ffff888001043700 ffffea000022b210 ffffea0000127010
[ 50.711777][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 50.712076][ T12] head: 0080000000000040 ffff888001043700 ffffea000022b210 ffffea0000127010
[ 50.712382][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 50.712793][ T12] head: 0080000000000003 ffffea00001ffe01 00000000ffffffff 00000000ffffffff
[ 50.713090][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 50.713488][ T12] page dumped because: kasan: bad access detected
[ 50.713700][ T12]
[ 50.713789][ T12] Memory state around the buggy address:
[ 50.713960][ T12] ffff888007ff9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 50.714298][ T12] ffff888007ff9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 50.714540][ T12] >ffff888007ff9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 50.714790][ T12] ^
[ 50.714958][ T12] ffff888007ff9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 50.715205][ T12] ffff888007ff9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 50.715540][ T12] ==================================================================
[ 50.716665][ T12] Disabling lock debugging due to kernel taint
[ 50.716899][ T12] ------------[ cut here ]------------
[ 50.717063][ T12] refcount_t: underflow; use-after-free.
[ 50.717297][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 50.717607][ T12] Modules linked in: tcp_diag inet_diag nft_tproxy nf_tproxy_ipv6 nf_tproxy_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[ 50.718052][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 50.718434][ T12] Tainted: [B]=BAD_PAGE
[ 50.718567][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 50.718791][ T12] Workqueue: netns cleanup_net
[ 50.718976][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 50.719192][ 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 65 91 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
[ 50.719891][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 50.720114][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 50.720460][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 50.720718][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff23fe220
[ 50.720985][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 50.721329][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 50.721579][ T12] FS: 0000000000000000(0000) GS:ffff8880a2f6c000(0000) knlGS:0000000000000000
[ 50.721970][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 50.722189][ T12] CR2: 00007fa0f49c9000 CR3: 000000002ef35004 CR4: 0000000000772ef0
[ 50.722450][ T12] PKRU: 55555554
[ 50.722662][ T12] Call Trace:
[ 50.722815][ T12]
[ 50.722907][ T12] netdev_run_todo+0x5f0/0xc60
[ 50.723078][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 50.723257][ T12] ? generic_xdp_install+0x410/0x410
[ 50.723428][ T12] ops_undo_list+0x714/0x890
[ 50.723605][ T12] ? netns_get+0x110/0x110
[ 50.723786][ T12] ? cleanup_net+0x2d6/0x830
[ 50.723956][ T12] cleanup_net+0x3b2/0x830
[ 50.724214][ T12] ? net_passive_dec+0x190/0x190
[ 50.724381][ T12] ? rcu_is_watching+0x12/0xb0
[ 50.724553][ T12] process_one_work+0xe35/0x1650
[ 50.724723][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 50.724979][ T12] ? assign_work+0x168/0x240
[ 50.725152][ T12] worker_thread+0x591/0xcf0
[ 50.725323][ T12] ? rescuer_thread+0xd10/0xd10
[ 50.725490][ T12] kthread+0x37b/0x5f0
[ 50.725617][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.725788][ T12] ? ret_from_fork+0x1b/0x270
[ 50.725962][ T12] ? __lock_release+0x5d/0x170
[ 50.726134][ T12] ? rcu_is_watching+0x12/0xb0
[ 50.726303][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.726477][ T12] ret_from_fork+0x1db/0x270
[ 50.726639][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.726824][ T12] ret_from_fork_asm+0x11/0x20
[ 50.726997][ T12]
[ 50.727127][ T12] irq event stamp: 10553
[ 50.727264][ T12] hardirqs last enabled at (10553): [] irqentry_exit+0x3b/0x80
[ 50.727659][ T12] hardirqs last disabled at (10552): [] handle_softirqs+0x47f/0x610
[ 50.727967][ T12] softirqs last enabled at (8380): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 50.728394][ T12] softirqs last disabled at (8378): [] dev_mc_flush+0x54/0x90
[ 50.728688][ T12] ---[ end trace 0000000000000000 ]---