[ 19.684713][ T68] ==================================================================
[ 19.685002][ T68] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 19.685275][ T68] Read of size 1 at addr ffff8880085146c4 by task kworker/u16:1/68
[ 19.685526][ T68]
[ 19.685622][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.685629][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.685633][ T68] Workqueue: netns cleanup_net
[ 19.685652][ T68] Call Trace:
[ 19.685657][ T68]
[ 19.685660][ T68] dump_stack_lvl+0x82/0xc0
[ 19.685668][ T68] print_address_description.constprop.0+0x2c/0x3a0
[ 19.685683][ T68] ? kobject_put+0xbb/0xd0
[ 19.685687][ T68] print_report+0xb4/0x270
[ 19.685691][ T68] ? kobject_put+0xbb/0xd0
[ 19.685694][ T68] ? kasan_addr_to_slab+0x21/0x70
[ 19.685697][ T68] ? kobject_put+0xbb/0xd0
[ 19.685700][ T68] kasan_report+0xca/0x100
[ 19.685704][ T68] ? kobject_put+0xbb/0xd0
[ 19.685709][ T68] kobject_put+0xbb/0xd0
[ 19.685713][ T68] netdev_run_todo+0x5f0/0xc60
[ 19.685720][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 19.685724][ T68] ? generic_xdp_install+0x410/0x410
[ 19.685727][ T68] ? net_generic+0xb1/0x1f0
[ 19.685741][ T68] ops_undo_list+0x714/0x890
[ 19.685750][ T68] ? rtnl_net_dumpid_one+0x270/0x270
[ 19.685754][ T68] ? cleanup_net+0x2d6/0x8b0
[ 19.685763][ T68] cleanup_net+0x3b2/0x8b0
[ 19.685767][ T68] ? net_passive_dec+0x190/0x190
[ 19.685772][ T68] ? rcu_is_watching+0x12/0xb0
[ 19.685788][ T68] process_one_work+0xe35/0x1650
[ 19.685802][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 19.685808][ T68] ? assign_work+0x168/0x240
[ 19.685812][ T68] worker_thread+0x591/0xcf0
[ 19.685818][ T68] ? rescuer_thread+0xd10/0xd10
[ 19.685822][ T68] kthread+0x37b/0x5f0
[ 19.685826][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.685829][ T68] ? ret_from_fork+0x1b/0x270
[ 19.685841][ T68] ? __lock_release+0x5d/0x170
[ 19.685847][ T68] ? rcu_is_watching+0x12/0xb0
[ 19.685850][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.685854][ T68] ret_from_fork+0x1db/0x270
[ 19.685856][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.685859][ T68] ret_from_fork_asm+0x11/0x20
[ 19.685873][ T68]
[ 19.685875][ T68]
[ 19.692103][ T68] Allocated by task 261:
[ 19.692228][ T68] kasan_save_stack+0x24/0x40
[ 19.692456][ T68] kasan_save_track+0x14/0x30
[ 19.692693][ T68] __kasan_kmalloc+0x7b/0x90
[ 19.692929][ T68] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 19.693179][ T68] alloc_netdev_mqs+0x7d/0x1370
[ 19.693453][ T68] ip6_tnl_init_net+0x102/0x3f0
[ 19.693721][ T68] ops_init+0x189/0x550
[ 19.693915][ T68] setup_net+0xf1/0x380
[ 19.694115][ T68] copy_net_ns+0x253/0x510
[ 19.694371][ T68] create_new_namespaces+0x35f/0x900
[ 19.694648][ T68] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 19.694914][ T68] ksys_unshare+0x2be/0x6e0
[ 19.695180][ T68] __x64_sys_unshare+0x31/0x40
[ 19.695431][ T68] do_syscall_64+0xc1/0xfd0
[ 19.695699][ T68] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 19.696028][ T68]
[ 19.696162][ T68] Freed by task 68:
[ 19.696357][ T68] kasan_save_stack+0x24/0x40
[ 19.696634][ T68] kasan_save_track+0x14/0x30
[ 19.696896][ T68] __kasan_save_free_info+0x3b/0x60
[ 19.697156][ T68] __kasan_slab_free+0x3f/0x60
[ 19.697438][ T68] kfree+0x21d/0x540
[ 19.697647][ T68] device_release+0x9c/0x210
[ 19.697923][ T68] kobject_cleanup+0xfe/0x360
[ 19.698184][ T68] netdev_run_todo+0x81f/0xc60
[ 19.698444][ T68] ops_undo_list+0x714/0x890
[ 19.698707][ T68] cleanup_net+0x3b2/0x8b0
[ 19.698976][ T68] process_one_work+0xe35/0x1650
[ 19.699220][ T68] worker_thread+0x591/0xcf0
[ 19.699443][ T68] kthread+0x37b/0x5f0
[ 19.699579][ T68] ret_from_fork+0x1db/0x270
[ 19.699738][ T68] ret_from_fork_asm+0x11/0x20
[ 19.699897][ T68]
[ 19.699975][ T68] The buggy address belongs to the object at ffff888008514000
[ 19.699975][ T68] which belongs to the cache kmalloc-4k of size 4096
[ 19.700368][ T68] The buggy address is located 1732 bytes inside of
[ 19.700368][ T68] freed 4096-byte region [ffff888008514000, ffff888008515000)
[ 19.700747][ T68]
[ 19.700835][ T68] The buggy address belongs to the physical page:
[ 19.701029][ T68] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8510
[ 19.701313][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 19.701550][ T68] flags: 0x80000000000040(head|node=0|zone=1)
[ 19.701743][ T68] page_type: f5(slab)
[ 19.701865][ T68] raw: 0080000000000040 ffff888001043700 ffffea0000277410 ffffea0000238210
[ 19.702182][ T68] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 19.702460][ T68] head: 0080000000000040 ffff888001043700 ffffea0000277410 ffffea0000238210
[ 19.702731][ T68] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 19.703002][ T68] head: 0080000000000003 ffffea0000214401 00000000ffffffff 00000000ffffffff
[ 19.703272][ T68] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 19.703576][ T68] page dumped because: kasan: bad access detected
[ 19.703775][ T68]
[ 19.703853][ T68] Memory state around the buggy address:
[ 19.704000][ T68] ffff888008514580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.704223][ T68] ffff888008514600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.704451][ T68] >ffff888008514680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.704676][ T68] ^
[ 19.704873][ T68] ffff888008514700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.705094][ T68] ffff888008514780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.705317][ T68] ==================================================================
[ 19.705628][ T68] Disabling lock debugging due to kernel taint
[ 19.705824][ T68] ------------[ cut here ]------------
[ 19.705969][ T68] refcount_t: underflow; use-after-free.
[ 19.706158][ T68] WARNING: CPU: 0 PID: 68 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 19.706437][ T68] Modules linked in:
[ 19.706567][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.707485][ T68] Tainted: [B]=BAD_PAGE
[ 19.708167][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.708364][ T68] Workqueue: netns cleanup_net
[ 19.708531][ T68] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 19.708812][ T68] 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 a5 84 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
[ 19.709400][ T68] RSP: 0018:ffffc90000497a08 EFLAGS: 00010282
[ 19.709680][ T68] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 19.709925][ T68] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 19.710164][ T68] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0b40934
[ 19.710400][ T68] R10: 0000000000000003 R11: ffffc90000497580 R12: 0000000000000001
[ 19.710699][ T68] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 19.710932][ T68] FS: 0000000000000000(0000) GS:ffff8880e6108000(0000) knlGS:0000000000000000
[ 19.711209][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 19.711414][ T68] CR2: 00007fb5a6316d00 CR3: 0000000023349005 CR4: 0000000000772ef0
[ 19.711709][ T68] PKRU: 55555554
[ 19.711835][ T68] Call Trace:
[ 19.711948][ T68]
[ 19.712037][ T68] netdev_run_todo+0x5f0/0xc60
[ 19.712199][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 19.712369][ T68] ? generic_xdp_install+0x410/0x410
[ 19.712524][ T68] ? net_generic+0xb1/0x1f0
[ 19.712745][ T68] ops_undo_list+0x714/0x890
[ 19.712912][ T68] ? rtnl_net_dumpid_one+0x270/0x270
[ 19.713065][ T68] ? cleanup_net+0x2d6/0x8b0
[ 19.713224][ T68] cleanup_net+0x3b2/0x8b0
[ 19.713391][ T68] ? net_passive_dec+0x190/0x190
[ 19.713552][ T68] ? rcu_is_watching+0x12/0xb0
[ 19.713771][ T68] process_one_work+0xe35/0x1650
[ 19.713933][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 19.714097][ T68] ? assign_work+0x168/0x240
[ 19.714273][ T68] worker_thread+0x591/0xcf0
[ 19.714433][ T68] ? rescuer_thread+0xd10/0xd10
[ 19.714706][ T68] kthread+0x37b/0x5f0
[ 19.714835][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.714997][ T68] ? ret_from_fork+0x1b/0x270
[ 19.715164][ T68] ? __lock_release+0x5d/0x170
[ 19.715324][ T68] ? rcu_is_watching+0x12/0xb0
[ 19.715479][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.715704][ T68] ret_from_fork+0x1db/0x270
[ 19.715868][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.716048][ T68] ret_from_fork_asm+0x11/0x20
[ 19.716218][ T68]
[ 19.716344][ T68] irq event stamp: 8225
[ 19.716497][ T68] hardirqs last enabled at (8225): [] finish_task_switch.isra.0+0x245/0x960
[ 19.716899][ T68] hardirqs last disabled at (8224): [] __schedule+0x94a/0x1b10
[ 19.717193][ T68] softirqs last enabled at (7370): [] unregister_netdevice_many_notify+0x714/0x1c90
[ 19.717504][ T68] softirqs last disabled at (7368): [] dev_mc_flush+0x54/0x90
[ 19.717857][ T68] ---[ end trace 0000000000000000 ]---