[ 24.066712][ T12] ==================================================================
[ 24.066978][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 24.067215][ T12] Read of size 1 at addr ffff88800534969c by task kworker/u16:0/12
[ 24.067438][ T12]
[ 24.067520][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 24.067526][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 24.067529][ T12] Workqueue: netns cleanup_net
[ 24.067538][ T12] Call Trace:
[ 24.067540][ T12]
[ 24.067543][ T12] dump_stack_lvl+0x82/0xc0
[ 24.067548][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 24.067557][ T12] ? kobject_put+0xbb/0xd0
[ 24.067561][ T12] print_report+0xb4/0x270
[ 24.067565][ T12] ? kobject_put+0xbb/0xd0
[ 24.067568][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 24.067572][ T12] ? kobject_put+0xbb/0xd0
[ 24.067575][ T12] kasan_report+0xca/0x100
[ 24.067579][ T12] ? kobject_put+0xbb/0xd0
[ 24.067587][ T12] kobject_put+0xbb/0xd0
[ 24.067592][ T12] netdev_run_todo+0x5f0/0xc60
[ 24.067599][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 24.067603][ T12] ? generic_xdp_install+0x410/0x410
[ 24.067609][ T12] ops_undo_list+0x714/0x890
[ 24.067614][ T12] ? netns_get+0x110/0x110
[ 24.067617][ T12] ? cleanup_net+0x2d6/0x830
[ 24.067623][ T12] cleanup_net+0x3b2/0x830
[ 24.067627][ T12] ? net_passive_dec+0x190/0x190
[ 24.067631][ T12] ? rcu_is_watching+0x12/0xb0
[ 24.067640][ T12] process_one_work+0xe35/0x1650
[ 24.067650][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 24.067656][ T12] ? assign_work+0x168/0x240
[ 24.067661][ T12] worker_thread+0x591/0xcf0
[ 24.067667][ T12] ? rescuer_thread+0xd10/0xd10
[ 24.067671][ T12] kthread+0x37b/0x5f0
[ 24.067675][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.067678][ T12] ? ret_from_fork+0x1b/0x270
[ 24.067685][ T12] ? __lock_release+0x5d/0x170
[ 24.067690][ T12] ? rcu_is_watching+0x12/0xb0
[ 24.067694][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.067698][ T12] ret_from_fork+0x1db/0x270
[ 24.067700][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.067704][ T12] ret_from_fork_asm+0x11/0x20
[ 24.067715][ T12]
[ 24.067716][ T12]
[ 24.074048][ T12] Allocated by task 314:
[ 24.074168][ T12] kasan_save_stack+0x24/0x40
[ 24.074332][ T12] kasan_save_track+0x14/0x30
[ 24.074487][ T12] __kasan_kmalloc+0x7b/0x90
[ 24.074652][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 24.074812][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 24.074972][ T12] sit_init_net+0x169/0x550
[ 24.075131][ T12] ops_init+0x189/0x550
[ 24.075249][ T12] setup_net+0xf1/0x380
[ 24.075367][ T12] copy_net_ns+0x21a/0x380
[ 24.075520][ T12] create_new_namespaces+0x35f/0x900
[ 24.075676][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 24.075924][ T12] ksys_unshare+0x2a3/0x660
[ 24.076080][ T12] __x64_sys_unshare+0x31/0x40
[ 24.076234][ T12] do_syscall_64+0xc1/0xfd0
[ 24.076393][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 24.076592][ T12]
[ 24.076676][ T12] Freed by task 12:
[ 24.076795][ T12] kasan_save_stack+0x24/0x40
[ 24.076957][ T12] kasan_save_track+0x14/0x30
[ 24.077110][ T12] __kasan_save_free_info+0x3b/0x60
[ 24.077269][ T12] __kasan_slab_free+0x3f/0x60
[ 24.077425][ T12] kfree+0x21d/0x540
[ 24.077542][ T12] device_release+0x9c/0x210
[ 24.077707][ T12] kobject_cleanup+0xfe/0x360
[ 24.077949][ T12] netdev_run_todo+0x81f/0xc60
[ 24.078107][ T12] ops_undo_list+0x714/0x890
[ 24.078263][ T12] cleanup_net+0x3b2/0x830
[ 24.078415][ T12] process_one_work+0xe35/0x1650
[ 24.078662][ T12] worker_thread+0x591/0xcf0
[ 24.078815][ T12] kthread+0x37b/0x5f0
[ 24.078936][ T12] ret_from_fork+0x1db/0x270
[ 24.079090][ T12] ret_from_fork_asm+0x11/0x20
[ 24.079334][ T12]
[ 24.079413][ T12] The buggy address belongs to the object at ffff888005349000
[ 24.079413][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 24.079799][ T12] The buggy address is located 1692 bytes inside of
[ 24.079799][ T12] freed 4096-byte region [ffff888005349000, ffff88800534a000)
[ 24.080251][ T12]
[ 24.080330][ T12] The buggy address belongs to the physical page:
[ 24.080524][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5348
[ 24.080900][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 24.081138][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 24.081337][ T12] page_type: f5(slab)
[ 24.081552][ T12] raw: 0080000000000040 ffff888001043700 ffffea000023ca10 ffffea00001e2210
[ 24.081844][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 24.082215][ T12] head: 0080000000000040 ffff888001043700 ffffea000023ca10 ffffea00001e2210
[ 24.082491][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 24.082770][ T12] head: 0080000000000003 ffffea000014d201 00000000ffffffff 00000000ffffffff
[ 24.083135][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 24.083421][ T12] page dumped because: kasan: bad access detected
[ 24.083702][ T12]
[ 24.083778][ T12] Memory state around the buggy address:
[ 24.083929][ T12] ffff888005349580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.084155][ T12] ffff888005349600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.084467][ T12] >ffff888005349680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.084696][ T12] ^
[ 24.084842][ T12] ffff888005349700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.085141][ T12] ffff888005349780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.085357][ T12] ==================================================================
[ 24.085767][ T12] Disabling lock debugging due to kernel taint
[ 24.085958][ T12] ------------[ cut here ]------------
[ 24.086098][ T12] refcount_t: underflow; use-after-free.
[ 24.086295][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 24.086559][ T12] Modules linked in:
[ 24.086689][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 24.087112][ T12] Tainted: [B]=BAD_PAGE
[ 24.087721][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 24.087912][ T12] Workqueue: netns cleanup_net
[ 24.088073][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 24.088277][ T12] Code: 32 b8 02 80 fb 01 0f 87 cb 8b d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 e5 32 b8 02 01 90 48 c7 c7 60 8d 05 9a e8 42 c1 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 24.088820][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282
[ 24.089012][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 24.089243][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 24.089468][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3542934
[ 24.089701][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 24.089924][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 24.090152][ T12] FS: 0000000000000000(0000) GS:ffff888094584000(0000) knlGS:0000000000000000
[ 24.090413][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 24.090603][ T12] CR2: 00007f428525c444 CR3: 0000000037959003 CR4: 0000000000772ef0
[ 24.090828][ T12] PKRU: 55555554
[ 24.090940][ T12] Call Trace:
[ 24.091051][ T12]
[ 24.091254][ T12] netdev_run_todo+0x5f0/0xc60
[ 24.091408][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 24.091558][ T12] ? generic_xdp_install+0x410/0x410
[ 24.091712][ T12] ops_undo_list+0x714/0x890
[ 24.091863][ T12] ? netns_get+0x110/0x110
[ 24.092094][ T12] ? cleanup_net+0x2d6/0x830
[ 24.092251][ T12] cleanup_net+0x3b2/0x830
[ 24.092402][ T12] ? net_passive_dec+0x190/0x190
[ 24.092566][ T12] ? rcu_is_watching+0x12/0xb0
[ 24.092810][ T12] process_one_work+0xe35/0x1650
[ 24.092964][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 24.093127][ T12] ? assign_work+0x168/0x240
[ 24.093384][ T12] worker_thread+0x591/0xcf0
[ 24.093534][ T12] ? rescuer_thread+0xd10/0xd10
[ 24.093691][ T12] kthread+0x37b/0x5f0
[ 24.093804][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.093964][ T12] ? ret_from_fork+0x1b/0x270
[ 24.094204][ T12] ? __lock_release+0x5d/0x170
[ 24.094354][ T12] ? rcu_is_watching+0x12/0xb0
[ 24.094501][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.094658][ T12] ret_from_fork+0x1db/0x270
[ 24.094817][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.094961][ T12] ret_from_fork_asm+0x11/0x20
[ 24.095115][ T12]
[ 24.095233][ T12] irq event stamp: 8357
[ 24.095430][ T12] hardirqs last enabled at (8357): [] finish_task_switch.isra.0+0x245/0x960
[ 24.095743][ T12] hardirqs last disabled at (8356): [] __schedule+0x94a/0x1b10
[ 24.096002][ T12] softirqs last enabled at (7482): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 24.096298][ T12] softirqs last disabled at (7480): [] dev_mc_flush+0x54/0x90
[ 24.096555][ T12] ---[ end trace 0000000000000000 ]---
[ 29.751859][ T383] netem: version 1.3
[ 88.281033][ T1529] mptcp_connect (1529) used greatest stack depth: 23768 bytes left
[ 156.543063][ T2731] mptcp_connect (2731) used greatest stack depth: 23696 bytes left
[ 165.308444][ T2887] mptcp_connect (2887) used greatest stack depth: 23568 bytes left