[ 24.144956][ T286] ip (286) used greatest stack depth: 23952 bytes left
[ 35.766294][ T12] ==================================================================
[ 35.766583][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 35.766877][ T12] Read of size 1 at addr ffff8880074d96ac by task kworker/u16:0/12
[ 35.767139][ T12]
[ 35.767236][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 35.767243][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 35.767247][ T12] Workqueue: netns cleanup_net
[ 35.767254][ T12] Call Trace:
[ 35.767256][ T12]
[ 35.767258][ T12] dump_stack_lvl+0x82/0xc0
[ 35.767264][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 35.767277][ T12] ? kobject_put+0xbb/0xd0
[ 35.767281][ T12] print_report+0xb4/0x270
[ 35.767285][ T12] ? kobject_put+0xbb/0xd0
[ 35.767288][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 35.767292][ T12] ? kobject_put+0xbb/0xd0
[ 35.767295][ T12] kasan_report+0xca/0x100
[ 35.767299][ T12] ? kobject_put+0xbb/0xd0
[ 35.767305][ T12] kobject_put+0xbb/0xd0
[ 35.767309][ T12] netdev_run_todo+0x5f0/0xc60
[ 35.767316][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 35.767319][ T12] ? generic_xdp_install+0x410/0x410
[ 35.767328][ T12] ops_undo_list+0x714/0x890
[ 35.767337][ T12] ? netns_get+0x110/0x110
[ 35.767340][ T12] ? cleanup_net+0x2d6/0x830
[ 35.767347][ T12] cleanup_net+0x3b2/0x830
[ 35.767350][ T12] ? net_passive_dec+0x190/0x190
[ 35.767354][ T12] ? rcu_is_watching+0x12/0xb0
[ 35.767363][ T12] process_one_work+0xe35/0x1650
[ 35.767374][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 35.767379][ T12] ? assign_work+0x168/0x240
[ 35.767383][ T12] worker_thread+0x591/0xcf0
[ 35.767389][ T12] ? rescuer_thread+0xd10/0xd10
[ 35.767392][ T12] kthread+0x37b/0x5f0
[ 35.767399][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 35.767401][ T12] ? ret_from_fork+0x1b/0x270
[ 35.767412][ T12] ? __lock_release+0x5d/0x170
[ 35.767421][ T12] ? rcu_is_watching+0x12/0xb0
[ 35.767424][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 35.767427][ T12] ret_from_fork+0x1db/0x270
[ 35.767431][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 35.767434][ T12] ret_from_fork_asm+0x11/0x20
[ 35.767448][ T12]
[ 35.767449][ T12]
[ 35.773748][ T12] Allocated by task 253:
[ 35.773885][ T12] kasan_save_stack+0x24/0x40
[ 35.774053][ T12] kasan_save_track+0x14/0x30
[ 35.774211][ T12] __kasan_kmalloc+0x7b/0x90
[ 35.774390][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 35.774555][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 35.774715][ T12] sit_init_net+0x169/0x550
[ 35.774886][ T12] ops_init+0x189/0x550
[ 35.775006][ T12] setup_net+0xf1/0x380
[ 35.775130][ T12] copy_net_ns+0x21a/0x380
[ 35.775287][ T12] create_new_namespaces+0x35f/0x900
[ 35.775454][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 35.775612][ T12] ksys_unshare+0x2a3/0x660
[ 35.775790][ T12] __x64_sys_unshare+0x31/0x40
[ 35.775947][ T12] do_syscall_64+0xc1/0xfd0
[ 35.776122][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 35.776324][ T12]
[ 35.776406][ T12] Freed by task 12:
[ 35.776522][ T12] kasan_save_stack+0x24/0x40
[ 35.776689][ T12] kasan_save_track+0x14/0x30
[ 35.776856][ T12] __kasan_save_free_info+0x3b/0x60
[ 35.777015][ T12] __kasan_slab_free+0x3f/0x60
[ 35.777174][ T12] kfree+0x21d/0x540
[ 35.777298][ T12] device_release+0x9c/0x210
[ 35.777462][ T12] kobject_cleanup+0xfe/0x360
[ 35.777623][ T12] netdev_run_todo+0x81f/0xc60
[ 35.777793][ T12] ops_undo_list+0x714/0x890
[ 35.777958][ T12] cleanup_net+0x3b2/0x830
[ 35.778120][ T12] process_one_work+0xe35/0x1650
[ 35.778278][ T12] worker_thread+0x591/0xcf0
[ 35.778438][ T12] kthread+0x37b/0x5f0
[ 35.778558][ T12] ret_from_fork+0x1db/0x270
[ 35.778719][ T12] ret_from_fork_asm+0x11/0x20
[ 35.778886][ T12]
[ 35.778972][ T12] The buggy address belongs to the object at ffff8880074d9000
[ 35.778972][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 35.779359][ T12] The buggy address is located 1708 bytes inside of
[ 35.779359][ T12] freed 4096-byte region [ffff8880074d9000, ffff8880074da000)
[ 35.779734][ T12]
[ 35.779831][ T12] The buggy address belongs to the physical page:
[ 35.780023][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x74d8
[ 35.780318][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 35.780556][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 35.780769][ T12] page_type: f5(slab)
[ 35.780898][ T12] raw: 0080000000000040 ffff888001043700 ffffea000026da10 ffffea0000099610
[ 35.781181][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 35.781469][ T12] head: 0080000000000040 ffff888001043700 ffffea000026da10 ffffea0000099610
[ 35.781759][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 35.782045][ T12] head: 0080000000000003 ffffea00001d3601 00000000ffffffff 00000000ffffffff
[ 35.782322][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 35.782610][ T12] page dumped because: kasan: bad access detected
[ 35.782811][ T12]
[ 35.782889][ T12] Memory state around the buggy address:
[ 35.783046][ T12] ffff8880074d9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 35.783274][ T12] ffff8880074d9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 35.783500][ T12] >ffff8880074d9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 35.783732][ T12] ^
[ 35.783905][ T12] ffff8880074d9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 35.784131][ T12] ffff8880074d9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 35.784374][ T12] ==================================================================
[ 35.786122][ T12] Disabling lock debugging due to kernel taint
[ 35.786495][ T12] ------------[ cut here ]------------
[ 35.786723][ T12] refcount_t: underflow; use-after-free.
[ 35.786996][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 35.787365][ T12] Modules linked in: nft_ct nf_conntrack_netlink veth nft_nat nft_numgen nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables
[ 35.787876][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 35.788281][ T12] Tainted: [B]=BAD_PAGE
[ 35.788453][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 35.788682][ T12] Workqueue: netns cleanup_net
[ 35.788882][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 35.789138][ 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 05 af 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
[ 35.789756][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 35.789991][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 35.790361][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 35.790631][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5f3e220
[ 35.790901][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 35.791234][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 35.791527][ T12] FS: 0000000000000000(0000) GS:ffff8880854ec000(0000) knlGS:0000000000000000
[ 35.791856][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 35.792096][ T12] CR2: 00007f4f6c89e970 CR3: 0000000028135005 CR4: 0000000000772ef0
[ 35.792400][ T12] PKRU: 55555554
[ 35.792620][ T12] Call Trace:
[ 35.792830][ T12]
[ 35.792942][ T12] netdev_run_todo+0x5f0/0xc60
[ 35.793174][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 35.793380][ T12] ? generic_xdp_install+0x410/0x410
[ 35.793568][ T12] ops_undo_list+0x714/0x890
[ 35.793763][ T12] ? netns_get+0x110/0x110
[ 35.793957][ T12] ? cleanup_net+0x2d6/0x830
[ 35.794232][ T12] cleanup_net+0x3b2/0x830
[ 35.794470][ T12] ? net_passive_dec+0x190/0x190
[ 35.794657][ T12] ? rcu_is_watching+0x12/0xb0
[ 35.794865][ T12] process_one_work+0xe35/0x1650
[ 35.795062][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 35.795329][ T12] ? assign_work+0x168/0x240
[ 35.795530][ T12] worker_thread+0x591/0xcf0
[ 35.795721][ T12] ? rescuer_thread+0xd10/0xd10
[ 35.795947][ T12] kthread+0x37b/0x5f0
[ 35.796141][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 35.796338][ T12] ? ret_from_fork+0x1b/0x270
[ 35.796550][ T12] ? __lock_release+0x5d/0x170
[ 35.796740][ T12] ? rcu_is_watching+0x12/0xb0
[ 35.796931][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 35.797126][ T12] ret_from_fork+0x1db/0x270
[ 35.797321][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 35.797514][ T12] ret_from_fork_asm+0x11/0x20
[ 35.797705][ T12]
[ 35.797858][ T12] irq event stamp: 6085
[ 35.798012][ T12] hardirqs last enabled at (6085): [] finish_task_switch.isra.0+0x245/0x960
[ 35.798396][ T12] hardirqs last disabled at (6084): [] __schedule+0x94a/0x1b10
[ 35.798712][ T12] softirqs last enabled at (5912): [] handle_softirqs+0x352/0x610
[ 35.799030][ T12] softirqs last disabled at (5905): [] irq_exit_rcu+0xab/0x100
[ 35.799405][ T12] ---[ end trace 0000000000000000 ]---