[ 16.056440][ T12] ==================================================================
[ 16.056879][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.057291][ T12] Read of size 1 at addr ffff888008de46c4 by task kworker/u16:0/12
[ 16.057682][ T12]
[ 16.057819][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.057827][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.057831][ T12] Workqueue: netns cleanup_net
[ 16.057843][ T12] Call Trace:
[ 16.057846][ T12]
[ 16.057851][ T12] dump_stack_lvl+0x82/0xc0
[ 16.057860][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.057871][ T12] ? kobject_put+0xbb/0xd0
[ 16.057877][ T12] print_report+0xb4/0x270
[ 16.057883][ T12] ? kobject_put+0xbb/0xd0
[ 16.057888][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.057894][ T12] ? kobject_put+0xbb/0xd0
[ 16.057899][ T12] kasan_report+0xca/0x100
[ 16.057906][ T12] ? kobject_put+0xbb/0xd0
[ 16.057915][ T12] kobject_put+0xbb/0xd0
[ 16.057921][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.057930][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.057937][ T12] ? generic_xdp_install+0x410/0x410
[ 16.057942][ T12] ? net_generic+0xb1/0x1f0
[ 16.057956][ T12] ops_undo_list+0x714/0x890
[ 16.057964][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 16.057970][ T12] ? cleanup_net+0x2d6/0x8b0
[ 16.057981][ T12] cleanup_net+0x3b2/0x8b0
[ 16.057988][ T12] ? net_passive_dec+0x190/0x190
[ 16.057997][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.058008][ T12] process_one_work+0xe35/0x1650
[ 16.058024][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.058035][ T12] ? assign_work+0x168/0x240
[ 16.058043][ T12] worker_thread+0x591/0xcf0
[ 16.058053][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.058060][ T12] kthread+0x37b/0x5f0
[ 16.058067][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.058072][ T12] ? ret_from_fork+0x1b/0x270
[ 16.058079][ T12] ? __lock_release+0x5d/0x170
[ 16.058087][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.058092][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.058099][ T12] ret_from_fork+0x1db/0x270
[ 16.058104][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.058109][ T12] ret_from_fork_asm+0x11/0x20
[ 16.058128][ T12]
[ 16.058130][ T12]
[ 16.065320][ T12] Allocated by task 267:
[ 16.065452][ T12] kasan_save_stack+0x24/0x40
[ 16.065629][ T12] kasan_save_track+0x14/0x30
[ 16.065799][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.065965][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.066131][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 16.066347][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 16.066570][ T12] ops_init+0x189/0x550
[ 16.066696][ T12] setup_net+0xf1/0x380
[ 16.066836][ T12] copy_net_ns+0x253/0x510
[ 16.067007][ T12] create_new_namespaces+0x35f/0x900
[ 16.067180][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 16.067360][ T12] ksys_unshare+0x2be/0x6e0
[ 16.067526][ T12] __x64_sys_unshare+0x31/0x40
[ 16.067687][ T12] do_syscall_64+0xc1/0xfd0
[ 16.067863][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.068078][ T12]
[ 16.068172][ T12] Freed by task 12:
[ 16.068312][ T12] kasan_save_stack+0x24/0x40
[ 16.068489][ T12] kasan_save_track+0x14/0x30
[ 16.068657][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.068830][ T12] __kasan_slab_free+0x3f/0x60
[ 16.068997][ T12] kfree+0x21d/0x540
[ 16.069125][ T12] device_release+0x9c/0x210
[ 16.069312][ T12] kobject_cleanup+0xfe/0x360
[ 16.069484][ T12] netdev_run_todo+0x81f/0xc60
[ 16.069651][ T12] ops_undo_list+0x714/0x890
[ 16.069824][ T12] cleanup_net+0x3b2/0x8b0
[ 16.069991][ T12] process_one_work+0xe35/0x1650
[ 16.070163][ T12] worker_thread+0x591/0xcf0
[ 16.070341][ T12] kthread+0x37b/0x5f0
[ 16.070473][ T12] ret_from_fork+0x1db/0x270
[ 16.070642][ T12] ret_from_fork_asm+0x11/0x20
[ 16.070821][ T12]
[ 16.070907][ T12] The buggy address belongs to the object at ffff888008de4000
[ 16.070907][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.071323][ T12] The buggy address is located 1732 bytes inside of
[ 16.071323][ T12] freed 4096-byte region [ffff888008de4000, ffff888008de5000)
[ 16.071725][ T12]
[ 16.071816][ T12] The buggy address belongs to the physical page:
[ 16.072033][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8de0
[ 16.072338][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.072596][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.072835][ T12] page_type: f5(slab)
[ 16.072966][ T12] raw: 0080000000000040 ffff888001043700 ffffea000023ce10 ffffea000023b210
[ 16.073279][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.073576][ T12] head: 0080000000000040 ffff888001043700 ffffea000023ce10 ffffea000023b210
[ 16.073880][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.074173][ T12] head: 0080000000000003 ffffea0000237801 00000000ffffffff 00000000ffffffff
[ 16.074476][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.074766][ T12] page dumped because: kasan: bad access detected
[ 16.074975][ T12]
[ 16.075059][ T12] Memory state around the buggy address:
[ 16.075217][ T12] ffff888008de4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.075477][ T12] ffff888008de4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.075714][ T12] >ffff888008de4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.076047][ T12] ^
[ 16.076253][ T12] ffff888008de4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.076500][ T12] ffff888008de4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.076831][ T12] ==================================================================
[ 16.077265][ T12] Disabling lock debugging due to kernel taint
[ 16.077653][ T12] ------------[ cut here ]------------
[ 16.077890][ T12] refcount_t: underflow; use-after-free.
[ 16.078203][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.078672][ T12] Modules linked in:
[ 16.078889][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.081384][ T12] Tainted: [B]=BAD_PAGE
[ 16.081595][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.081948][ T12] Workqueue: netns cleanup_net
[ 16.082462][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.082803][ 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 65 b5 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
[ 16.084326][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.084663][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.085420][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.085835][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6cc0934
[ 16.086447][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.087006][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.087986][ T12] FS: 0000000000000000(0000) GS:ffff8880b5688000(0000) knlGS:0000000000000000
[ 16.088840][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.089335][ T12] CR2: 00005639a8210260 CR3: 000000001f949006 CR4: 0000000000772ef0
[ 16.089746][ T12] PKRU: 55555554
[ 16.089953][ T12] Call Trace:
[ 16.090166][ T12]
[ 16.090641][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.090922][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.091201][ T12] ? generic_xdp_install+0x410/0x410
[ 16.091473][ T12] ? net_generic+0xb1/0x1f0
[ 16.092069][ T12] ops_undo_list+0x714/0x890
[ 16.092363][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 16.092642][ T12] ? cleanup_net+0x2d6/0x8b0
[ 16.092923][ T12] cleanup_net+0x3b2/0x8b0
[ 16.093199][ T12] ? net_passive_dec+0x190/0x190
[ 16.093622][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.093897][ T12] process_one_work+0xe35/0x1650
[ 16.094190][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.094465][ T12] ? assign_work+0x168/0x240
[ 16.094737][ T12] worker_thread+0x591/0xcf0
[ 16.095198][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.095626][ T12] kthread+0x37b/0x5f0
[ 16.095842][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.096271][ T12] ? ret_from_fork+0x1b/0x270
[ 16.096550][ T12] ? __lock_release+0x5d/0x170
[ 16.097130][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.097411][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.097685][ T12] ret_from_fork+0x1db/0x270
[ 16.097946][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.098210][ T12] ret_from_fork_asm+0x11/0x20
[ 16.098478][ T12]
[ 16.098849][ T12] irq event stamp: 8709
[ 16.099054][ T12] hardirqs last enabled at (8709): [] finish_task_switch.isra.0+0x245/0x960
[ 16.099591][ T12] hardirqs last disabled at (8708): [] __schedule+0x94a/0x1b10
[ 16.100077][ T12] softirqs last enabled at (8268): [] handle_softirqs+0x352/0x610
[ 16.100554][ T12] softirqs last disabled at (8263): [] irq_exit_rcu+0xab/0x100
[ 16.101017][ T12] ---[ end trace 0000000000000000 ]---