[ 13.974247][ T12] ==================================================================
[ 13.974558][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 13.974854][ T12] Read of size 1 at addr ffff888008594694 by task kworker/u16:0/12
[ 13.975096][ T12]
[ 13.975188][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 13.975193][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 13.975196][ T12] Workqueue: netns cleanup_net
[ 13.975206][ T12] Call Trace:
[ 13.975208][ T12]
[ 13.975211][ T12] dump_stack_lvl+0x82/0xc0
[ 13.975217][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 13.975226][ T12] ? kobject_put+0xbb/0xd0
[ 13.975230][ T12] print_report+0xb4/0x270
[ 13.975233][ T12] ? kobject_put+0xbb/0xd0
[ 13.975236][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 13.975240][ T12] ? kobject_put+0xbb/0xd0
[ 13.975242][ T12] kasan_report+0xca/0x100
[ 13.975247][ T12] ? kobject_put+0xbb/0xd0
[ 13.975252][ T12] kobject_put+0xbb/0xd0
[ 13.975255][ T12] netdev_run_todo+0x5f0/0xc60
[ 13.975262][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 13.975265][ T12] ? generic_xdp_install+0x410/0x410
[ 13.975272][ T12] ops_undo_list+0x714/0x890
[ 13.975276][ T12] ? netns_get+0x110/0x110
[ 13.975278][ T12] ? cleanup_net+0x2d6/0x830
[ 13.975283][ T12] cleanup_net+0x3b2/0x830
[ 13.975286][ T12] ? net_passive_dec+0x190/0x190
[ 13.975290][ T12] ? rcu_is_watching+0x12/0xb0
[ 13.975297][ T12] process_one_work+0xe35/0x1650
[ 13.975305][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 13.975310][ T12] ? assign_work+0x168/0x240
[ 13.975314][ T12] worker_thread+0x591/0xcf0
[ 13.975319][ T12] ? rescuer_thread+0xd10/0xd10
[ 13.975322][ T12] kthread+0x37b/0x5f0
[ 13.975326][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.975328][ T12] ? ret_from_fork+0x1b/0x270
[ 13.975335][ T12] ? __lock_release+0x5d/0x170
[ 13.975342][ T12] ? rcu_is_watching+0x12/0xb0
[ 13.975345][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.975348][ T12] ret_from_fork+0x1db/0x270
[ 13.975351][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.975353][ T12] ret_from_fork_asm+0x11/0x20
[ 13.975362][ T12]
[ 13.975364][ T12]
[ 13.981465][ T12] Allocated by task 228:
[ 13.981588][ T12] kasan_save_stack+0x24/0x40
[ 13.981753][ T12] kasan_save_track+0x14/0x30
[ 13.981947][ T12] __kasan_kmalloc+0x7b/0x90
[ 13.982106][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 13.982268][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 13.982428][ T12] sit_init_net+0x169/0x550
[ 13.982585][ T12] ops_init+0x189/0x550
[ 13.982723][ T12] setup_net+0xf1/0x380
[ 13.982853][ T12] copy_net_ns+0x21a/0x380
[ 13.983011][ T12] create_new_namespaces+0x35f/0x900
[ 13.983178][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 13.983335][ T12] ksys_unshare+0x2a3/0x660
[ 13.983495][ T12] __x64_sys_unshare+0x31/0x40
[ 13.983683][ T12] do_syscall_64+0xc1/0xfd0
[ 13.983861][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 13.984063][ T12]
[ 13.984147][ T12] Freed by task 12:
[ 13.984265][ T12] kasan_save_stack+0x24/0x40
[ 13.984435][ T12] kasan_save_track+0x14/0x30
[ 13.984593][ T12] __kasan_save_free_info+0x3b/0x60
[ 13.984748][ T12] __kasan_slab_free+0x3f/0x60
[ 13.984907][ T12] kfree+0x21d/0x540
[ 13.985026][ T12] device_release+0x9c/0x210
[ 13.985184][ T12] kobject_cleanup+0xfe/0x360
[ 13.985364][ T12] netdev_run_todo+0x81f/0xc60
[ 13.985524][ T12] ops_undo_list+0x714/0x890
[ 13.985676][ T12] cleanup_net+0x3b2/0x830
[ 13.985833][ T12] process_one_work+0xe35/0x1650
[ 13.985988][ T12] worker_thread+0x591/0xcf0
[ 13.986140][ T12] kthread+0x37b/0x5f0
[ 13.986255][ T12] ret_from_fork+0x1db/0x270
[ 13.986409][ T12] ret_from_fork_asm+0x11/0x20
[ 13.986565][ T12]
[ 13.986649][ T12] The buggy address belongs to the object at ffff888008594000
[ 13.986649][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 13.987035][ T12] The buggy address is located 1684 bytes inside of
[ 13.987035][ T12] freed 4096-byte region [ffff888008594000, ffff888008595000)
[ 13.987408][ T12]
[ 13.987485][ T12] The buggy address belongs to the physical page:
[ 13.987675][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8590
[ 13.988055][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 13.988299][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 13.988498][ T12] page_type: f5(slab)
[ 13.988624][ T12] raw: 0080000000000040 ffff888001043700 ffffea00002f1010 ffffea00001d8a10
[ 13.989005][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 13.989285][ T12] head: 0080000000000040 ffff888001043700 ffffea00002f1010 ffffea00001d8a10
[ 13.989569][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 13.989847][ T12] head: 0080000000000003 ffffea0000216401 00000000ffffffff 00000000ffffffff
[ 13.990213][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 13.990485][ T12] page dumped because: kasan: bad access detected
[ 13.990680][ T12]
[ 13.990756][ T12] Memory state around the buggy address:
[ 13.990998][ T12] ffff888008594580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.991222][ T12] ffff888008594600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.991443][ T12] >ffff888008594680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.991746][ T12] ^
[ 13.991896][ T12] ffff888008594700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.992111][ T12] ffff888008594780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.992413][ T12] ==================================================================
[ 13.992697][ T12] Disabling lock debugging due to kernel taint
[ 13.992979][ T12] ------------[ cut here ]------------
[ 13.993123][ T12] refcount_t: underflow; use-after-free.
[ 13.993304][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 13.993606][ T12] Modules linked in: veth
[ 13.993744][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 13.994120][ T12] Tainted: [B]=BAD_PAGE
[ 13.994324][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 13.994537][ T12] Workqueue: netns cleanup_net
[ 13.994711][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 13.994959][ T12] Code: 48 92 02 80 fb 01 0f 87 cb 7d d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 75 48 92 02 01 90 48 c7 c7 a0 8d 25 8e e8 42 93 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 37 a1 ff e9 ba fe ff ff
[ 13.995523][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 13.995833][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 13.996087][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 13.996321][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1d7e134
[ 13.996566][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 13.996816][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 13.997156][ T12] FS: 0000000000000000(0000) GS:ffff8880a0610000(0000) knlGS:0000000000000000
[ 13.997459][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 13.997700][ T12] CR2: 00007f89577d2000 CR3: 0000000008b6c002 CR4: 0000000000772ef0
[ 13.998073][ T12] PKRU: 55555554
[ 13.998206][ T12] Call Trace:
[ 13.998341][ T12]
[ 13.998427][ T12] netdev_run_todo+0x5f0/0xc60
[ 13.998622][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 13.998897][ T12] ? generic_xdp_install+0x410/0x410
[ 13.999080][ T12] ops_undo_list+0x714/0x890
[ 13.999244][ T12] ? netns_get+0x110/0x110
[ 13.999405][ T12] ? cleanup_net+0x2d6/0x830
[ 13.999675][ T12] cleanup_net+0x3b2/0x830
[ 13.999844][ T12] ? net_passive_dec+0x190/0x190
[ 14.000059][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.000210][ T12] process_one_work+0xe35/0x1650
[ 14.000470][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.000646][ T12] ? assign_work+0x168/0x240
[ 14.000800][ T12] worker_thread+0x591/0xcf0
[ 14.000982][ T12] ? rescuer_thread+0xd10/0xd10
[ 14.001218][ T12] kthread+0x37b/0x5f0
[ 14.001331][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.001497][ T12] ? ret_from_fork+0x1b/0x270
[ 14.001663][ T12] ? __lock_release+0x5d/0x170
[ 14.001936][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.002093][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.002241][ T12] ret_from_fork+0x1db/0x270
[ 14.002393][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.002563][ T12] ret_from_fork_asm+0x11/0x20
[ 14.002742][ T12]
[ 14.002875][ T12] irq event stamp: 2677
[ 14.003001][ T12] hardirqs last enabled at (2677): [] finish_task_switch.isra.0+0x245/0x960
[ 14.003391][ T12] hardirqs last disabled at (2676): [] __schedule+0x94a/0x1b10
[ 14.003676][ T12] softirqs last enabled at (2398): [] handle_softirqs+0x352/0x610
[ 14.004052][ T12] softirqs last disabled at (2391): [] irq_exit_rcu+0xab/0x100
[ 14.004309][ T12] ---[ end trace 0000000000000000 ]---