[ 16.747719][ T12] ==================================================================
[ 16.748040][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.748348][ T12] Read of size 1 at addr ffff88800751c6c4 by task kworker/u16:0/12
[ 16.748606][ T12]
[ 16.748693][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.748698][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.748701][ T12] Workqueue: netns cleanup_net
[ 16.748709][ T12] Call Trace:
[ 16.748711][ T12]
[ 16.748714][ T12] dump_stack_lvl+0x82/0xc0
[ 16.748720][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.748727][ T12] ? kobject_put+0xbb/0xd0
[ 16.748731][ T12] print_report+0xb4/0x270
[ 16.748734][ T12] ? kobject_put+0xbb/0xd0
[ 16.748737][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.748741][ T12] ? kobject_put+0xbb/0xd0
[ 16.748744][ T12] kasan_report+0xca/0x100
[ 16.748748][ T12] ? kobject_put+0xbb/0xd0
[ 16.748753][ T12] kobject_put+0xbb/0xd0
[ 16.748756][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.748761][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.748765][ T12] ? generic_xdp_install+0x410/0x410
[ 16.748768][ T12] ? net_generic+0xb1/0x1f0
[ 16.748776][ T12] ops_undo_list+0x714/0x890
[ 16.748782][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 16.748786][ T12] ? cleanup_net+0x2d6/0x8b0
[ 16.748792][ T12] cleanup_net+0x3b2/0x8b0
[ 16.748796][ T12] ? net_passive_dec+0x190/0x190
[ 16.748801][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.748808][ T12] process_one_work+0xe35/0x1650
[ 16.748816][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.748822][ T12] ? assign_work+0x168/0x240
[ 16.748826][ T12] worker_thread+0x591/0xcf0
[ 16.748832][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.748836][ T12] kthread+0x37b/0x5f0
[ 16.748839][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.748842][ T12] ? ret_from_fork+0x1b/0x270
[ 16.748846][ T12] ? __lock_release+0x5d/0x170
[ 16.748850][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.748854][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.748857][ T12] ret_from_fork+0x1db/0x270
[ 16.748860][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.748863][ T12] ret_from_fork_asm+0x11/0x20
[ 16.748871][ T12]
[ 16.748872][ T12]
[ 16.755860][ T12] Allocated by task 258:
[ 16.755987][ T12] kasan_save_stack+0x24/0x40
[ 16.756175][ T12] kasan_save_track+0x14/0x30
[ 16.756342][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.756524][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.756702][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 16.756862][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 16.757031][ T12] ops_init+0x189/0x550
[ 16.757169][ T12] setup_net+0xf1/0x380
[ 16.757293][ T12] copy_net_ns+0x253/0x510
[ 16.757466][ T12] create_new_namespaces+0x35f/0x900
[ 16.757642][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 16.757797][ T12] ksys_unshare+0x2be/0x6e0
[ 16.757954][ T12] __x64_sys_unshare+0x31/0x40
[ 16.758126][ T12] do_syscall_64+0xc1/0xfd0
[ 16.758291][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.758501][ T12]
[ 16.758583][ T12] Freed by task 12:
[ 16.758705][ T12] kasan_save_stack+0x24/0x40
[ 16.758869][ T12] kasan_save_track+0x14/0x30
[ 16.759033][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.759211][ T12] __kasan_slab_free+0x3f/0x60
[ 16.759378][ T12] kfree+0x21d/0x540
[ 16.759504][ T12] device_release+0x9c/0x210
[ 16.759662][ T12] kobject_cleanup+0xfe/0x360
[ 16.759817][ T12] netdev_run_todo+0x81f/0xc60
[ 16.759979][ T12] ops_undo_list+0x714/0x890
[ 16.760161][ T12] cleanup_net+0x3b2/0x8b0
[ 16.760330][ T12] process_one_work+0xe35/0x1650
[ 16.760501][ T12] worker_thread+0x591/0xcf0
[ 16.760654][ T12] kthread+0x37b/0x5f0
[ 16.760773][ T12] ret_from_fork+0x1db/0x270
[ 16.760925][ T12] ret_from_fork_asm+0x11/0x20
[ 16.761098][ T12]
[ 16.761187][ T12] The buggy address belongs to the object at ffff88800751c000
[ 16.761187][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.761574][ T12] The buggy address is located 1732 bytes inside of
[ 16.761574][ T12] freed 4096-byte region [ffff88800751c000, ffff88800751d000)
[ 16.761945][ T12]
[ 16.762033][ T12] The buggy address belongs to the physical page:
[ 16.762242][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7518
[ 16.762541][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.762873][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.763217][ T12] page_type: f5(slab)
[ 16.763350][ T12] raw: 0080000000000040 ffff888001043700 ffffea00001ca610 ffffea00001eba10
[ 16.763645][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.763925][ T12] head: 0080000000000040 ffff888001043700 ffffea00001ca610 ffffea00001eba10
[ 16.764242][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.764632][ T12] head: 0080000000000003 ffffea00001d4601 00000000ffffffff 00000000ffffffff
[ 16.765013][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.765313][ T12] page dumped because: kasan: bad access detected
[ 16.765527][ T12]
[ 16.765606][ T12] Memory state around the buggy address:
[ 16.765758][ T12] ffff88800751c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.766087][ T12] ffff88800751c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.766322][ T12] >ffff88800751c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.766654][ T12] ^
[ 16.766839][ T12] ffff88800751c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.767071][ T12] ffff88800751c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.767407][ T12] ==================================================================
[ 16.768371][ T12] Disabling lock debugging due to kernel taint
[ 16.768661][ T12] ------------[ cut here ]------------
[ 16.768877][ T12] refcount_t: underflow; use-after-free.
[ 16.769072][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.769399][ T12] Modules linked in:
[ 16.769538][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.769925][ T12] Tainted: [B]=BAD_PAGE
[ 16.770049][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.770264][ T12] Workqueue: netns cleanup_net
[ 16.770465][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.770691][ T12] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba c5 9b e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
[ 16.771287][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.771497][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.771748][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.772016][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3980934
[ 16.772274][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.772520][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.772772][ T12] FS: 0000000000000000(0000) GS:ffff8880cef88000(0000) knlGS:0000000000000000
[ 16.773118][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.773349][ T12] CR2: 0000555fd7754990 CR3: 0000000012b49002 CR4: 0000000000772ef0
[ 16.773629][ T12] PKRU: 55555554
[ 16.773763][ T12] Call Trace:
[ 16.773897][ T12]
[ 16.773990][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.774198][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.774383][ T12] ? generic_xdp_install+0x410/0x410
[ 16.774569][ T12] ? net_generic+0xb1/0x1f0
[ 16.774751][ T12] ops_undo_list+0x714/0x890
[ 16.774932][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 16.775111][ T12] ? cleanup_net+0x2d6/0x8b0
[ 16.775293][ T12] cleanup_net+0x3b2/0x8b0
[ 16.775472][ T12] ? net_passive_dec+0x190/0x190
[ 16.775655][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.775856][ T12] process_one_work+0xe35/0x1650
[ 16.776049][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.776236][ T12] ? assign_work+0x168/0x240
[ 16.776416][ T12] worker_thread+0x591/0xcf0
[ 16.776622][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.776804][ T12] kthread+0x37b/0x5f0
[ 16.776943][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.777129][ T12] ? ret_from_fork+0x1b/0x270
[ 16.777310][ T12] ? __lock_release+0x5d/0x170
[ 16.777494][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.777684][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.777863][ T12] ret_from_fork+0x1db/0x270
[ 16.778041][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.778219][ T12] ret_from_fork_asm+0x11/0x20
[ 16.778407][ T12]
[ 16.778551][ T12] irq event stamp: 8511
[ 16.778686][ T12] hardirqs last enabled at (8511): [] finish_task_switch.isra.0+0x245/0x960
[ 16.779045][ T12] hardirqs last disabled at (8510): [] __schedule+0x94a/0x1b10
[ 16.779337][ T12] softirqs last enabled at (8152): [] handle_softirqs+0x352/0x610
[ 16.779647][ T12] softirqs last disabled at (8147): [] irq_exit_rcu+0xab/0x100
[ 16.779941][ T12] ---[ end trace 0000000000000000 ]---
[ 33.270446][ C1] IPv4: Oversized IP packet from 172.17.0.2