[ 38.710343][ T71] ==================================================================
[ 38.710653][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 38.710914][ T71] Read of size 1 at addr ffff888007bf96ac by task kworker/u16:1/71
[ 38.711145][ T71]
[ 38.711233][ T71] CPU: 2 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 38.711239][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 38.711243][ T71] Workqueue: netns cleanup_net
[ 38.711249][ T71] Call Trace:
[ 38.711252][ T71]
[ 38.711254][ T71] dump_stack_lvl+0x82/0xc0
[ 38.711260][ T71] print_address_description.constprop.0+0x2c/0x3a0
[ 38.711269][ T71] ? kobject_put+0xbb/0xd0
[ 38.711273][ T71] print_report+0xb4/0x270
[ 38.711278][ T71] ? kobject_put+0xbb/0xd0
[ 38.711281][ T71] ? kasan_addr_to_slab+0x21/0x70
[ 38.711285][ T71] ? kobject_put+0xbb/0xd0
[ 38.711288][ T71] kasan_report+0xca/0x100
[ 38.711292][ T71] ? kobject_put+0xbb/0xd0
[ 38.711298][ T71] kobject_put+0xbb/0xd0
[ 38.711302][ T71] netdev_run_todo+0x5f0/0xc60
[ 38.711308][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 38.711312][ T71] ? generic_xdp_install+0x410/0x410
[ 38.711319][ T71] ops_undo_list+0x714/0x890
[ 38.711327][ T71] ? netns_get+0x110/0x110
[ 38.711330][ T71] ? cleanup_net+0x2d6/0x830
[ 38.711335][ T71] cleanup_net+0x3b2/0x830
[ 38.711339][ T71] ? net_passive_dec+0x190/0x190
[ 38.711343][ T71] ? rcu_is_watching+0x12/0xb0
[ 38.711350][ T71] process_one_work+0xe35/0x1650
[ 38.711359][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 38.711365][ T71] ? assign_work+0x168/0x240
[ 38.711369][ T71] worker_thread+0x591/0xcf0
[ 38.711375][ T71] ? rescuer_thread+0xd10/0xd10
[ 38.711378][ T71] kthread+0x37b/0x5f0
[ 38.711383][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.711386][ T71] ? ret_from_fork+0x1b/0x270
[ 38.711393][ T71] ? __lock_release+0x5d/0x170
[ 38.711400][ T71] ? rcu_is_watching+0x12/0xb0
[ 38.711402][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.711406][ T71] ret_from_fork+0x1db/0x270
[ 38.711409][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.711412][ T71] ret_from_fork_asm+0x11/0x20
[ 38.711422][ T71]
[ 38.711423][ T71]
[ 38.717704][ T71] Allocated by task 253:
[ 38.717839][ T71] kasan_save_stack+0x24/0x40
[ 38.718021][ T71] kasan_save_track+0x14/0x30
[ 38.718199][ T71] __kasan_kmalloc+0x7b/0x90
[ 38.718387][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 38.718556][ T71] alloc_netdev_mqs+0x7d/0x1370
[ 38.718724][ T71] sit_init_net+0x169/0x550
[ 38.718898][ T71] ops_init+0x189/0x550
[ 38.719025][ T71] setup_net+0xf1/0x380
[ 38.719154][ T71] copy_net_ns+0x21a/0x380
[ 38.719324][ T71] create_new_namespaces+0x35f/0x900
[ 38.719495][ T71] unshare_nsproxy_namespaces+0x89/0x120
[ 38.719667][ T71] ksys_unshare+0x2a3/0x660
[ 38.719837][ T71] __x64_sys_unshare+0x31/0x40
[ 38.720007][ T71] do_syscall_64+0xc1/0xfd0
[ 38.720177][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 38.720390][ T71]
[ 38.720478][ T71] Freed by task 71:
[ 38.720612][ T71] kasan_save_stack+0x24/0x40
[ 38.720794][ T71] kasan_save_track+0x14/0x30
[ 38.720967][ T71] __kasan_save_free_info+0x3b/0x60
[ 38.721143][ T71] __kasan_slab_free+0x3f/0x60
[ 38.721314][ T71] kfree+0x21d/0x540
[ 38.721443][ T71] device_release+0x9c/0x210
[ 38.721622][ T71] kobject_cleanup+0xfe/0x360
[ 38.721791][ T71] netdev_run_todo+0x81f/0xc60
[ 38.721965][ T71] ops_undo_list+0x714/0x890
[ 38.722155][ T71] cleanup_net+0x3b2/0x830
[ 38.722377][ T71] process_one_work+0xe35/0x1650
[ 38.722554][ T71] worker_thread+0x591/0xcf0
[ 38.722725][ T71] kthread+0x37b/0x5f0
[ 38.722855][ T71] ret_from_fork+0x1db/0x270
[ 38.723028][ T71] ret_from_fork_asm+0x11/0x20
[ 38.723212][ T71]
[ 38.723308][ T71] The buggy address belongs to the object at ffff888007bf9000
[ 38.723308][ T71] which belongs to the cache kmalloc-4k of size 4096
[ 38.723723][ T71] The buggy address is located 1708 bytes inside of
[ 38.723723][ T71] freed 4096-byte region [ffff888007bf9000, ffff888007bfa000)
[ 38.724158][ T71]
[ 38.724245][ T71] The buggy address belongs to the physical page:
[ 38.724461][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7bf8
[ 38.724768][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 38.725029][ T71] flags: 0x80000000000040(head|node=0|zone=1)
[ 38.725252][ T71] page_type: f5(slab)
[ 38.725385][ T71] raw: 0080000000000040 ffff888001043700 ffffea000022e810 ffffea0000295c10
[ 38.725701][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 38.726009][ T71] head: 0080000000000040 ffff888001043700 ffffea000022e810 ffffea0000295c10
[ 38.726316][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 38.726616][ T71] head: 0080000000000003 ffffea00001efe01 00000000ffffffff 00000000ffffffff
[ 38.726928][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 38.727231][ T71] page dumped because: kasan: bad access detected
[ 38.727446][ T71]
[ 38.727532][ T71] Memory state around the buggy address:
[ 38.727706][ T71] ffff888007bf9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 38.727961][ T71] ffff888007bf9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 38.728214][ T71] >ffff888007bf9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 38.728513][ T71] ^
[ 38.728681][ T71] ffff888007bf9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 38.728926][ T71] ffff888007bf9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 38.729159][ T71] ==================================================================
[ 38.729558][ T71] Disabling lock debugging due to kernel taint
[ 38.729841][ T71] ------------[ cut here ]------------
[ 38.730019][ T71] refcount_t: underflow; use-after-free.
[ 38.730221][ T71] WARNING: CPU: 2 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 38.730536][ T71] Modules linked in: nft_redir nft_chain_nat nf_nat nf_conntrack_netlink nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[ 38.731526][ T71] CPU: 2 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 38.731987][ T71] Tainted: [B]=BAD_PAGE
[ 38.732182][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 38.732456][ T71] Workqueue: netns cleanup_net
[ 38.732671][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 38.732927][ T71] 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 94 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
[ 38.733490][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282
[ 38.733719][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 38.733991][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 38.734251][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2afe220
[ 38.734519][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001
[ 38.734778][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 38.735030][ T71] FS: 0000000000000000(0000) GS:ffff888099aec000(0000) knlGS:0000000000000000
[ 38.735313][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 38.735527][ T71] CR2: 00007fa47fa8a000 CR3: 000000003d535002 CR4: 0000000000772ef0
[ 38.735787][ T71] PKRU: 55555554
[ 38.735925][ T71] Call Trace:
[ 38.736067][ T71]
[ 38.736170][ T71] netdev_run_todo+0x5f0/0xc60
[ 38.736353][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 38.736529][ T71] ? generic_xdp_install+0x410/0x410
[ 38.736719][ T71] ops_undo_list+0x714/0x890
[ 38.736894][ T71] ? netns_get+0x110/0x110
[ 38.737068][ T71] ? cleanup_net+0x2d6/0x830
[ 38.737239][ T71] cleanup_net+0x3b2/0x830
[ 38.737411][ T71] ? net_passive_dec+0x190/0x190
[ 38.737584][ T71] ? rcu_is_watching+0x12/0xb0
[ 38.737772][ T71] process_one_work+0xe35/0x1650
[ 38.737954][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 38.738129][ T71] ? assign_work+0x168/0x240
[ 38.738300][ T71] worker_thread+0x591/0xcf0
[ 38.738492][ T71] ? rescuer_thread+0xd10/0xd10
[ 38.738694][ T71] kthread+0x37b/0x5f0
[ 38.738837][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.739019][ T71] ? ret_from_fork+0x1b/0x270
[ 38.739194][ T71] ? __lock_release+0x5d/0x170
[ 38.739379][ T71] ? rcu_is_watching+0x12/0xb0
[ 38.739561][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.739739][ T71] ret_from_fork+0x1db/0x270
[ 38.739922][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.740100][ T71] ret_from_fork_asm+0x11/0x20
[ 38.740283][ T71]
[ 38.740431][ T71] irq event stamp: 4215
[ 38.740577][ T71] hardirqs last enabled at (4215): [] finish_task_switch.isra.0+0x245/0x960
[ 38.740920][ T71] hardirqs last disabled at (4214): [] __schedule+0x94a/0x1b10
[ 38.741316][ T71] softirqs last enabled at (3928): [] handle_softirqs+0x352/0x610
[ 38.741622][ T71] softirqs last disabled at (3923): [] irq_exit_rcu+0xab/0x100
[ 38.741912][ T71] ---[ end trace 0000000000000000 ]---