[ 19.105419][ T12] ==================================================================
[ 19.105713][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 19.105955][ T12] Read of size 1 at addr ffff888009c496c4 by task kworker/u16:0/12
[ 19.106179][ T12]
[ 19.106263][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.106268][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.106271][ T12] Workqueue: netns cleanup_net
[ 19.106281][ T12] Call Trace:
[ 19.106283][ T12]
[ 19.106286][ T12] dump_stack_lvl+0x82/0xc0
[ 19.106292][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 19.106300][ T12] ? kobject_put+0xbb/0xd0
[ 19.106304][ T12] print_report+0xb4/0x270
[ 19.106308][ T12] ? kobject_put+0xbb/0xd0
[ 19.106311][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 19.106315][ T12] ? kobject_put+0xbb/0xd0
[ 19.106318][ T12] kasan_report+0xca/0x100
[ 19.106322][ T12] ? kobject_put+0xbb/0xd0
[ 19.106327][ T12] kobject_put+0xbb/0xd0
[ 19.106331][ T12] netdev_run_todo+0x5f0/0xc60
[ 19.106337][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 19.106341][ T12] ? generic_xdp_install+0x410/0x410
[ 19.106348][ T12] ops_undo_list+0x714/0x890
[ 19.106353][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 19.106356][ T12] ? cleanup_net+0x2d6/0x8b0
[ 19.106362][ T12] cleanup_net+0x3b2/0x8b0
[ 19.106366][ T12] ? net_passive_dec+0x190/0x190
[ 19.106371][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.106380][ T12] process_one_work+0xe35/0x1650
[ 19.106390][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 19.106399][ T12] ? assign_work+0x168/0x240
[ 19.106405][ T12] worker_thread+0x591/0xcf0
[ 19.106414][ T12] ? rescuer_thread+0xd10/0xd10
[ 19.106420][ T12] kthread+0x37b/0x5f0
[ 19.106425][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.106428][ T12] ? ret_from_fork+0x1b/0x270
[ 19.106434][ T12] ? __lock_release+0x5d/0x170
[ 19.106439][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.106442][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.106446][ T12] ret_from_fork+0x1db/0x270
[ 19.106449][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.106452][ T12] ret_from_fork_asm+0x11/0x20
[ 19.106463][ T12]
[ 19.106464][ T12]
[ 19.112614][ T12] Allocated by task 261:
[ 19.112747][ T12] kasan_save_stack+0x24/0x40
[ 19.112927][ T12] kasan_save_track+0x14/0x30
[ 19.113083][ T12] __kasan_kmalloc+0x7b/0x90
[ 19.113239][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 19.113410][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 19.113573][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 19.113729][ T12] ops_init+0x189/0x550
[ 19.113847][ T12] setup_net+0xf1/0x380
[ 19.113967][ T12] copy_net_ns+0x253/0x510
[ 19.114123][ T12] create_new_namespaces+0x35f/0x900
[ 19.114281][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 19.114454][ T12] ksys_unshare+0x2be/0x6e0
[ 19.114611][ T12] __x64_sys_unshare+0x31/0x40
[ 19.114770][ T12] do_syscall_64+0xc1/0xfd0
[ 19.114927][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 19.115118][ T12]
[ 19.115199][ T12] Freed by task 12:
[ 19.115319][ T12] kasan_save_stack+0x24/0x40
[ 19.115495][ T12] kasan_save_track+0x14/0x30
[ 19.115653][ T12] __kasan_save_free_info+0x3b/0x60
[ 19.115811][ T12] __kasan_slab_free+0x3f/0x60
[ 19.115963][ T12] kfree+0x21d/0x540
[ 19.116081][ T12] device_release+0x9c/0x210
[ 19.116238][ T12] kobject_cleanup+0xfe/0x360
[ 19.116407][ T12] netdev_run_todo+0x81f/0xc60
[ 19.116568][ T12] ops_undo_list+0x714/0x890
[ 19.116727][ T12] cleanup_net+0x3b2/0x8b0
[ 19.116884][ T12] process_one_work+0xe35/0x1650
[ 19.117049][ T12] worker_thread+0x591/0xcf0
[ 19.117200][ T12] kthread+0x37b/0x5f0
[ 19.117316][ T12] ret_from_fork+0x1db/0x270
[ 19.117487][ T12] ret_from_fork_asm+0x11/0x20
[ 19.117644][ T12]
[ 19.117724][ T12] The buggy address belongs to the object at ffff888009c49000
[ 19.117724][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 19.118095][ T12] The buggy address is located 1732 bytes inside of
[ 19.118095][ T12] freed 4096-byte region [ffff888009c49000, ffff888009c4a000)
[ 19.118486][ T12]
[ 19.118567][ T12] The buggy address belongs to the physical page:
[ 19.118756][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9c48
[ 19.119032][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 19.119275][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 19.119490][ T12] page_type: f5(slab)
[ 19.119615][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000247610 ffffea00002d6e10
[ 19.119891][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 19.120161][ T12] head: 0080000000000040 ffff888001043700 ffffea0000247610 ffffea00002d6e10
[ 19.120478][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 19.120745][ T12] head: 0080000000000003 ffffea0000271201 00000000ffffffff 00000000ffffffff
[ 19.121013][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 19.121284][ T12] page dumped because: kasan: bad access detected
[ 19.121491][ T12]
[ 19.121572][ T12] Memory state around the buggy address:
[ 19.121723][ T12] ffff888009c49580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.121942][ T12] ffff888009c49600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.122164][ T12] >ffff888009c49680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.122395][ T12] ^
[ 19.122599][ T12] ffff888009c49700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.122824][ T12] ffff888009c49780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.123045][ T12] ==================================================================
[ 19.123341][ T12] Disabling lock debugging due to kernel taint
[ 19.123580][ T12] ------------[ cut here ]------------
[ 19.123754][ T12] refcount_t: underflow; use-after-free.
[ 19.123979][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 19.124276][ T12] Modules linked in:
[ 19.124440][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.124815][ T12] Tainted: [B]=BAD_PAGE
[ 19.124974][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.125189][ T12] Workqueue: netns cleanup_net
[ 19.125384][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 19.125625][ 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 25 9d 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
[ 19.126199][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282
[ 19.126435][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 19.126685][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 19.126953][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3c40934
[ 19.127215][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 19.127483][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 19.127734][ T12] FS: 0000000000000000(0000) GS:ffff8880cda08000(0000) knlGS:0000000000000000
[ 19.128032][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 19.128248][ T12] CR2: 00007f77e16051b4 CR3: 0000000033549003 CR4: 0000000000772ef0
[ 19.128533][ T12] PKRU: 55555554
[ 19.128671][ T12] Call Trace:
[ 19.128808][ T12]
[ 19.128909][ T12] netdev_run_todo+0x5f0/0xc60
[ 19.129097][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 19.129282][ T12] ? generic_xdp_install+0x410/0x410
[ 19.129482][ T12] ops_undo_list+0x714/0x890
[ 19.129669][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 19.129840][ T12] ? cleanup_net+0x2d6/0x8b0
[ 19.130022][ T12] cleanup_net+0x3b2/0x8b0
[ 19.130196][ T12] ? net_passive_dec+0x190/0x190
[ 19.130393][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.130585][ T12] process_one_work+0xe35/0x1650
[ 19.130762][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 19.130936][ T12] ? assign_work+0x168/0x240
[ 19.131127][ T12] worker_thread+0x591/0xcf0
[ 19.131316][ T12] ? rescuer_thread+0xd10/0xd10
[ 19.131518][ T12] kthread+0x37b/0x5f0
[ 19.131665][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.131839][ T12] ? ret_from_fork+0x1b/0x270
[ 19.132051][ T12] ? __lock_release+0x5d/0x170
[ 19.132230][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.132424][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.132611][ T12] ret_from_fork+0x1db/0x270
[ 19.132783][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.132963][ T12] ret_from_fork_asm+0x11/0x20
[ 19.133148][ T12]
[ 19.133290][ T12] irq event stamp: 10311
[ 19.133444][ T12] hardirqs last enabled at (10311): [] irqentry_exit+0x3b/0x80
[ 19.133746][ T12] hardirqs last disabled at (10310): [] handle_softirqs+0x47f/0x610
[ 19.134051][ T12] softirqs last enabled at (10228): [] handle_softirqs+0x352/0x610
[ 19.134341][ T12] softirqs last disabled at (10133): [] irq_exit_rcu+0xab/0x100
[ 19.134651][ T12] ---[ end trace 0000000000000000 ]---