[ 36.062058][ T12] ==================================================================
[ 36.062357][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 36.062609][ T12] Read of size 1 at addr ffff888007f896ac by task kworker/u16:0/12
[ 36.062846][ T12]
[ 36.062930][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 36.062936][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 36.062938][ T12] Workqueue: netns cleanup_net
[ 36.062944][ T12] Call Trace:
[ 36.062946][ T12]
[ 36.062949][ T12] dump_stack_lvl+0x82/0xc0
[ 36.062954][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 36.062961][ T12] ? kobject_put+0xbb/0xd0
[ 36.062965][ T12] print_report+0xb4/0x270
[ 36.062969][ T12] ? kobject_put+0xbb/0xd0
[ 36.062972][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 36.062975][ T12] ? kobject_put+0xbb/0xd0
[ 36.062978][ T12] kasan_report+0xca/0x100
[ 36.062983][ T12] ? kobject_put+0xbb/0xd0
[ 36.062989][ T12] kobject_put+0xbb/0xd0
[ 36.062992][ T12] netdev_run_todo+0x5f0/0xc60
[ 36.062997][ T12] ? irqentry_exit+0x3b/0x80
[ 36.063001][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 36.063005][ T12] ? generic_xdp_install+0x410/0x410
[ 36.063012][ T12] ops_undo_list+0x714/0x890
[ 36.063019][ T12] ? netns_get+0x110/0x110
[ 36.063022][ T12] ? cleanup_net+0x2d6/0x830
[ 36.063027][ T12] cleanup_net+0x3b2/0x830
[ 36.063030][ T12] ? net_passive_dec+0x190/0x190
[ 36.063034][ T12] ? rcu_is_watching+0x12/0xb0
[ 36.063040][ T12] process_one_work+0xe35/0x1650
[ 36.063048][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 36.063053][ T12] ? assign_work+0x168/0x240
[ 36.063057][ T12] worker_thread+0x591/0xcf0
[ 36.063063][ T12] ? rescuer_thread+0xd10/0xd10
[ 36.063066][ T12] kthread+0x37b/0x5f0
[ 36.063070][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 36.063074][ T12] ? ret_from_fork+0x1b/0x270
[ 36.063082][ T12] ? __lock_release+0x5d/0x170
[ 36.063090][ T12] ? rcu_is_watching+0x12/0xb0
[ 36.063093][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 36.063096][ T12] ret_from_fork+0x1db/0x270
[ 36.063099][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 36.063102][ T12] ret_from_fork_asm+0x11/0x20
[ 36.063111][ T12]
[ 36.063113][ T12]
[ 36.069722][ T12] Allocated by task 251:
[ 36.069844][ T12] kasan_save_stack+0x24/0x40
[ 36.070011][ T12] kasan_save_track+0x14/0x30
[ 36.070177][ T12] __kasan_kmalloc+0x7b/0x90
[ 36.070341][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 36.070513][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 36.070679][ T12] sit_init_net+0x169/0x550
[ 36.070844][ T12] ops_init+0x189/0x550
[ 36.070969][ T12] setup_net+0xf1/0x380
[ 36.071096][ T12] copy_net_ns+0x21a/0x380
[ 36.071259][ T12] create_new_namespaces+0x35f/0x900
[ 36.071437][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 36.071605][ T12] ksys_unshare+0x2a3/0x660
[ 36.071769][ T12] __x64_sys_unshare+0x31/0x40
[ 36.071932][ T12] do_syscall_64+0xc1/0xfd0
[ 36.072107][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 36.072310][ T12]
[ 36.072404][ T12] Freed by task 12:
[ 36.072528][ T12] kasan_save_stack+0x24/0x40
[ 36.072707][ T12] kasan_save_track+0x14/0x30
[ 36.072875][ T12] __kasan_save_free_info+0x3b/0x60
[ 36.073039][ T12] __kasan_slab_free+0x3f/0x60
[ 36.073211][ T12] kfree+0x21d/0x540
[ 36.073332][ T12] device_release+0x9c/0x210
[ 36.073515][ T12] kobject_cleanup+0xfe/0x360
[ 36.073681][ T12] netdev_run_todo+0x81f/0xc60
[ 36.073849][ T12] ops_undo_list+0x714/0x890
[ 36.074012][ T12] cleanup_net+0x3b2/0x830
[ 36.074183][ T12] process_one_work+0xe35/0x1650
[ 36.074350][ T12] worker_thread+0x591/0xcf0
[ 36.074516][ T12] kthread+0x37b/0x5f0
[ 36.074634][ T12] ret_from_fork+0x1db/0x270
[ 36.074793][ T12] ret_from_fork_asm+0x11/0x20
[ 36.074953][ T12]
[ 36.075033][ T12] The buggy address belongs to the object at ffff888007f89000
[ 36.075033][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 36.075440][ T12] The buggy address is located 1708 bytes inside of
[ 36.075440][ T12] freed 4096-byte region [ffff888007f89000, ffff888007f8a000)
[ 36.075824][ T12]
[ 36.075904][ T12] The buggy address belongs to the physical page:
[ 36.076105][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f88
[ 36.076412][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 36.076653][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 36.076856][ T12] page_type: f5(slab)
[ 36.076983][ T12] raw: 0080000000000040 ffff888001043700 ffffea000012d810 ffffea0000465210
[ 36.077455][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 36.077766][ T12] head: 0080000000000040 ffff888001043700 ffffea000012d810 ffffea0000465210
[ 36.078051][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 36.078376][ T12] head: 0080000000000003 ffffea00001fe201 00000000ffffffff 00000000ffffffff
[ 36.078665][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 36.078953][ T12] page dumped because: kasan: bad access detected
[ 36.079163][ T12]
[ 36.079247][ T12] Memory state around the buggy address:
[ 36.079431][ T12] ffff888007f89580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 36.079661][ T12] ffff888007f89600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 36.079888][ T12] >ffff888007f89680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 36.080132][ T12] ^
[ 36.080289][ T12] ffff888007f89700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 36.080530][ T12] ffff888007f89780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 36.080756][ T12] ==================================================================
[ 36.081271][ T12] Disabling lock debugging due to kernel taint
[ 36.081482][ T12] ------------[ cut here ]------------
[ 36.081633][ T12] refcount_t: underflow; use-after-free.
[ 36.081808][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 36.082161][ T12] Modules linked in: nft_masq nft_chain_nat nf_nat nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[ 36.082547][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 36.082903][ T12] Tainted: [B]=BAD_PAGE
[ 36.083095][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 36.083301][ T12] Workqueue: netns cleanup_net
[ 36.083476][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 36.083688][ 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 25 bb 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
[ 36.084318][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 36.084531][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 36.084768][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 36.085082][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff777e220
[ 36.085327][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 36.085574][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 36.085839][ T12] FS: 0000000000000000(0000) GS:ffff88807936c000(0000) knlGS:0000000000000000
[ 36.086195][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 36.086407][ T12] CR2: 00007f7a8832b000 CR3: 000000000d735001 CR4: 0000000000772ef0
[ 36.086648][ T12] PKRU: 55555554
[ 36.086773][ T12] Call Trace:
[ 36.086895][ T12]
[ 36.087049][ T12] netdev_run_todo+0x5f0/0xc60
[ 36.087235][ T12] ? irqentry_exit+0x3b/0x80
[ 36.087418][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 36.087578][ T12] ? generic_xdp_install+0x410/0x410
[ 36.087739][ T12] ops_undo_list+0x714/0x890
[ 36.087905][ T12] ? netns_get+0x110/0x110
[ 36.088134][ T12] ? cleanup_net+0x2d6/0x830
[ 36.088300][ T12] cleanup_net+0x3b2/0x830
[ 36.088468][ T12] ? net_passive_dec+0x190/0x190
[ 36.088631][ T12] ? rcu_is_watching+0x12/0xb0
[ 36.088791][ T12] process_one_work+0xe35/0x1650
[ 36.089006][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 36.089172][ T12] ? assign_work+0x168/0x240
[ 36.089327][ T12] worker_thread+0x591/0xcf0
[ 36.089503][ T12] ? rescuer_thread+0xd10/0xd10
[ 36.089665][ T12] kthread+0x37b/0x5f0
[ 36.089782][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 36.089955][ T12] ? ret_from_fork+0x1b/0x270
[ 36.090125][ T12] ? __lock_release+0x5d/0x170
[ 36.090281][ T12] ? rcu_is_watching+0x12/0xb0
[ 36.090444][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 36.090602][ T12] ret_from_fork+0x1db/0x270
[ 36.090762][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 36.090926][ T12] ret_from_fork_asm+0x11/0x20
[ 36.091094][ T12]
[ 36.091214][ T12] irq event stamp: 8777
[ 36.091353][ T12] hardirqs last enabled at (8777): [] irqentry_exit+0x3b/0x80
[ 36.091632][ T12] hardirqs last disabled at (8776): [] handle_softirqs+0x47f/0x610
[ 36.091904][ T12] softirqs last enabled at (7578): [] handle_softirqs+0x352/0x610
[ 36.092191][ T12] softirqs last disabled at (7573): [] irq_exit_rcu+0xab/0x100
[ 36.092486][ T12] ---[ end trace 0000000000000000 ]---