[ 483.344911][ T12] ==================================================================
[ 483.345444][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 483.345866][ T12] Read of size 1 at addr ffff888008c546c4 by task kworker/u16:0/12
[ 483.346169][ T12]
[ 483.346278][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 483.346285][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 483.346289][ T12] Workqueue: netns cleanup_net
[ 483.346312][ T12] Call Trace:
[ 483.346318][ T12]
[ 483.346321][ T12] dump_stack_lvl+0x82/0xc0
[ 483.346332][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 483.346351][ T12] ? kobject_put+0xbb/0xd0
[ 483.346357][ T12] print_report+0xb4/0x270
[ 483.346361][ T12] ? kobject_put+0xbb/0xd0
[ 483.346364][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 483.346368][ T12] ? kobject_put+0xbb/0xd0
[ 483.346371][ T12] kasan_report+0xca/0x100
[ 483.346375][ T12] ? kobject_put+0xbb/0xd0
[ 483.346380][ T12] kobject_put+0xbb/0xd0
[ 483.346384][ T12] netdev_run_todo+0x5f0/0xc60
[ 483.346393][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 483.346397][ T12] ? generic_xdp_install+0x410/0x410
[ 483.346400][ T12] ? net_generic+0xb1/0x1f0
[ 483.346415][ T12] ops_undo_list+0x714/0x890
[ 483.346420][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 483.346424][ T12] ? cleanup_net+0x2d6/0x8b0
[ 483.346430][ T12] cleanup_net+0x3b2/0x8b0
[ 483.346434][ T12] ? net_passive_dec+0x190/0x190
[ 483.346439][ T12] ? rcu_is_watching+0x12/0xb0
[ 483.346456][ T12] process_one_work+0xe35/0x1650
[ 483.346472][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 483.346477][ T12] ? assign_work+0x168/0x240
[ 483.346482][ T12] worker_thread+0x591/0xcf0
[ 483.346488][ T12] ? rescuer_thread+0xd10/0xd10
[ 483.346492][ T12] kthread+0x37b/0x5f0
[ 483.346497][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 483.346500][ T12] ? ret_from_fork+0x1b/0x270
[ 483.346518][ T12] ? __lock_release+0x5d/0x170
[ 483.346524][ T12] ? rcu_is_watching+0x12/0xb0
[ 483.346528][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 483.346532][ T12] ret_from_fork+0x1db/0x270
[ 483.346534][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 483.346537][ T12] ret_from_fork_asm+0x11/0x20
[ 483.346556][ T12]
[ 483.346557][ T12]
[ 483.352938][ T12] Allocated by task 257:
[ 483.353081][ T12] kasan_save_stack+0x24/0x40
[ 483.353249][ T12] kasan_save_track+0x14/0x30
[ 483.353409][ T12] __kasan_kmalloc+0x7b/0x90
[ 483.353581][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 483.353755][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 483.353914][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 483.354086][ T12] ops_init+0x189/0x550
[ 483.354208][ T12] setup_net+0xf1/0x380
[ 483.354334][ T12] copy_net_ns+0x253/0x510
[ 483.354497][ T12] create_new_namespaces+0x35f/0x900
[ 483.354658][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 483.354819][ T12] ksys_unshare+0x2be/0x6e0
[ 483.354976][ T12] __x64_sys_unshare+0x31/0x40
[ 483.355134][ T12] do_syscall_64+0xc1/0xfd0
[ 483.355288][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 483.355487][ T12]
[ 483.355568][ T12] Freed by task 12:
[ 483.355698][ T12] kasan_save_stack+0x24/0x40
[ 483.355869][ T12] kasan_save_track+0x14/0x30
[ 483.356028][ T12] __kasan_save_free_info+0x3b/0x60
[ 483.356185][ T12] __kasan_slab_free+0x3f/0x60
[ 483.356349][ T12] kfree+0x21d/0x540
[ 483.356469][ T12] device_release+0x9c/0x210
[ 483.356637][ T12] kobject_cleanup+0xfe/0x360
[ 483.356802][ T12] netdev_run_todo+0x81f/0xc60
[ 483.356958][ T12] ops_undo_list+0x714/0x890
[ 483.357115][ T12] cleanup_net+0x3b2/0x8b0
[ 483.357267][ T12] process_one_work+0xe35/0x1650
[ 483.357422][ T12] worker_thread+0x591/0xcf0
[ 483.357578][ T12] kthread+0x37b/0x5f0
[ 483.357702][ T12] ret_from_fork+0x1db/0x270
[ 483.357865][ T12] ret_from_fork_asm+0x11/0x20
[ 483.358023][ T12]
[ 483.358113][ T12] The buggy address belongs to the object at ffff888008c54000
[ 483.358113][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 483.358491][ T12] The buggy address is located 1732 bytes inside of
[ 483.358491][ T12] freed 4096-byte region [ffff888008c54000, ffff888008c55000)
[ 483.358881][ T12]
[ 483.358965][ T12] The buggy address belongs to the physical page:
[ 483.359164][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8c50
[ 483.359451][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 483.359717][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 483.359929][ T12] page_type: f5(slab)
[ 483.360052][ T12] raw: 0080000000000040 ffff888001043700 ffffea000022b210 ffffea000021ac10
[ 483.360339][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 483.360612][ T12] head: 0080000000000040 ffff888001043700 ffffea000022b210 ffffea000021ac10
[ 483.360905][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 483.361180][ T12] head: 0080000000000003 ffffea0000231401 00000000ffffffff 00000000ffffffff
[ 483.361452][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 483.361749][ T12] page dumped because: kasan: bad access detected
[ 483.361937][ T12]
[ 483.362016][ T12] Memory state around the buggy address:
[ 483.362172][ T12] ffff888008c54580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 483.362406][ T12] ffff888008c54600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 483.362626][ T12] >ffff888008c54680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 483.362871][ T12] ^
[ 483.363058][ T12] ffff888008c54700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 483.363279][ T12] ffff888008c54780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 483.363500][ T12] ==================================================================
[ 483.364087][ T12] Disabling lock debugging due to kernel taint
[ 483.364317][ T12] ------------[ cut here ]------------
[ 483.364721][ T12] refcount_t: underflow; use-after-free.
[ 483.365114][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 483.365425][ T12] Modules linked in:
[ 483.365581][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 483.365953][ T12] Tainted: [B]=BAD_PAGE
[ 483.366092][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 483.366297][ T12] Workqueue: netns cleanup_net
[ 483.366553][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 483.366766][ 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 e5 a1 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
[ 483.367337][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 483.367656][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 483.367908][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 483.368156][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff45c0934
[ 483.368391][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 483.368706][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 483.368951][ T12] FS: 0000000000000000(0000) GS:ffff8880c8d88000(0000) knlGS:0000000000000000
[ 483.369231][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 483.369445][ T12] CR2: 00005617867da108 CR3: 000000000d149004 CR4: 0000000000772ef0
[ 483.369767][ T12] PKRU: 55555554
[ 483.369888][ T12] Call Trace:
[ 483.370035][ T12]
[ 483.370127][ T12] netdev_run_todo+0x5f0/0xc60
[ 483.370296][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 483.370523][ T12] ? generic_xdp_install+0x410/0x410
[ 483.370676][ T12] ? net_generic+0xb1/0x1f0
[ 483.370839][ T12] ops_undo_list+0x714/0x890
[ 483.371004][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 483.371157][ T12] ? cleanup_net+0x2d6/0x8b0
[ 483.371311][ T12] cleanup_net+0x3b2/0x8b0
[ 483.371534][ T12] ? net_passive_dec+0x190/0x190
[ 483.371695][ T12] ? rcu_is_watching+0x12/0xb0
[ 483.371853][ T12] process_one_work+0xe35/0x1650
[ 483.372024][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 483.372183][ T12] ? assign_work+0x168/0x240
[ 483.372337][ T12] worker_thread+0x591/0xcf0
[ 483.372539][ T12] ? rescuer_thread+0xd10/0xd10
[ 483.372695][ T12] kthread+0x37b/0x5f0
[ 483.372827][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 483.372993][ T12] ? ret_from_fork+0x1b/0x270
[ 483.373157][ T12] ? __lock_release+0x5d/0x170
[ 483.373321][ T12] ? rcu_is_watching+0x12/0xb0
[ 483.373483][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 483.373649][ T12] ret_from_fork+0x1db/0x270
[ 483.373804][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 483.373956][ T12] ret_from_fork_asm+0x11/0x20
[ 483.374130][ T12]
[ 483.374249][ T12] irq event stamp: 9221
[ 483.374373][ T12] hardirqs last enabled at (9221): [] finish_task_switch.isra.0+0x245/0x960
[ 483.374705][ T12] hardirqs last disabled at (9220): [] __schedule+0x94a/0x1b10
[ 483.375015][ T12] softirqs last enabled at (9046): [] handle_softirqs+0x352/0x610
[ 483.375293][ T12] softirqs last disabled at (9039): [] irq_exit_rcu+0xab/0x100
[ 483.375577][ T12] ---[ end trace 0000000000000000 ]---