[ 16.018061][ T12] ==================================================================
[ 16.018483][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.018765][ T12] Read of size 1 at addr ffff8880081c9694 by task kworker/u16:0/12
[ 16.019024][ T12]
[ 16.019121][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.019129][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.019136][ T12] Workqueue: netns cleanup_net
[ 16.019147][ T12] Call Trace:
[ 16.019150][ T12]
[ 16.019154][ T12] dump_stack_lvl+0x82/0xc0
[ 16.019161][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.019171][ T12] ? kobject_put+0xbb/0xd0
[ 16.019174][ T12] print_report+0xb4/0x270
[ 16.019178][ T12] ? kobject_put+0xbb/0xd0
[ 16.019181][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.019185][ T12] ? kobject_put+0xbb/0xd0
[ 16.019188][ T12] kasan_report+0xca/0x100
[ 16.019192][ T12] ? kobject_put+0xbb/0xd0
[ 16.019197][ T12] kobject_put+0xbb/0xd0
[ 16.019201][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.019208][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.019212][ T12] ? generic_xdp_install+0x410/0x410
[ 16.019218][ T12] ops_undo_list+0x714/0x890
[ 16.019222][ T12] ? netns_get+0x110/0x110
[ 16.019224][ T12] ? cleanup_net+0x2d6/0x830
[ 16.019229][ T12] cleanup_net+0x3b2/0x830
[ 16.019232][ T12] ? net_passive_dec+0x190/0x190
[ 16.019236][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.019242][ T12] process_one_work+0xe35/0x1650
[ 16.019250][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.019257][ T12] ? assign_work+0x168/0x240
[ 16.019264][ T12] worker_thread+0x591/0xcf0
[ 16.019272][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.019277][ T12] kthread+0x37b/0x5f0
[ 16.019281][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.019284][ T12] ? ret_from_fork+0x1b/0x270
[ 16.019290][ T12] ? __lock_release+0x5d/0x170
[ 16.019296][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.019299][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.019302][ T12] ret_from_fork+0x1db/0x270
[ 16.019305][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.019307][ T12] ret_from_fork_asm+0x11/0x20
[ 16.019316][ T12]
[ 16.019318][ T12]
[ 16.026346][ T12] Allocated by task 228:
[ 16.026497][ T12] kasan_save_stack+0x24/0x40
[ 16.026696][ T12] kasan_save_track+0x14/0x30
[ 16.026879][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.027057][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.027260][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 16.027446][ T12] sit_init_net+0x169/0x550
[ 16.027627][ T12] ops_init+0x189/0x550
[ 16.027782][ T12] setup_net+0xf1/0x380
[ 16.027922][ T12] copy_net_ns+0x21a/0x380
[ 16.028105][ T12] create_new_namespaces+0x35f/0x900
[ 16.028324][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 16.028516][ T12] ksys_unshare+0x2a3/0x660
[ 16.028711][ T12] __x64_sys_unshare+0x31/0x40
[ 16.028895][ T12] do_syscall_64+0xc1/0xfd0
[ 16.029106][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.029372][ T12]
[ 16.029476][ T12] Freed by task 12:
[ 16.029616][ T12] kasan_save_stack+0x24/0x40
[ 16.029822][ T12] kasan_save_track+0x14/0x30
[ 16.030013][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.030198][ T12] __kasan_slab_free+0x3f/0x60
[ 16.030398][ T12] kfree+0x21d/0x540
[ 16.030534][ T12] device_release+0x9c/0x210
[ 16.030723][ T12] kobject_cleanup+0xfe/0x360
[ 16.030901][ T12] netdev_run_todo+0x81f/0xc60
[ 16.031080][ T12] ops_undo_list+0x714/0x890
[ 16.031286][ T12] cleanup_net+0x3b2/0x830
[ 16.031476][ T12] process_one_work+0xe35/0x1650
[ 16.031651][ T12] worker_thread+0x591/0xcf0
[ 16.031830][ T12] kthread+0x37b/0x5f0
[ 16.031961][ T12] ret_from_fork+0x1db/0x270
[ 16.032145][ T12] ret_from_fork_asm+0x11/0x20
[ 16.032323][ T12]
[ 16.032417][ T12] The buggy address belongs to the object at ffff8880081c9000
[ 16.032417][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.032856][ T12] The buggy address is located 1684 bytes inside of
[ 16.032856][ T12] freed 4096-byte region [ffff8880081c9000, ffff8880081ca000)
[ 16.033326][ T12]
[ 16.033420][ T12] The buggy address belongs to the physical page:
[ 16.033656][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x81c8
[ 16.033988][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.034277][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.034508][ T12] page_type: f5(slab)
[ 16.034652][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000221210 ffffea0000218610
[ 16.034970][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.035305][ T12] head: 0080000000000040 ffff888001043700 ffffea0000221210 ffffea0000218610
[ 16.035626][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.035937][ T12] head: 0080000000000003 ffffea0000207201 00000000ffffffff 00000000ffffffff
[ 16.036256][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.036597][ T12] page dumped because: kasan: bad access detected
[ 16.036822][ T12]
[ 16.036910][ T12] Memory state around the buggy address:
[ 16.037081][ T12] ffff8880081c9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.037365][ T12] ffff8880081c9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.037627][ T12] >ffff8880081c9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.037891][ T12] ^
[ 16.038060][ T12] ffff8880081c9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.038349][ T12] ffff8880081c9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.038613][ T12] ==================================================================
[ 16.038914][ T12] Disabling lock debugging due to kernel taint
[ 16.039136][ T12] ------------[ cut here ]------------
[ 16.039400][ T12] refcount_t: underflow; use-after-free.
[ 16.039637][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.039957][ T12] Modules linked in: veth
[ 16.040107][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.040581][ T12] Tainted: [B]=BAD_PAGE
[ 16.040717][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.040943][ T12] Workqueue: netns cleanup_net
[ 16.041139][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.041402][ 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 65 a7 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
[ 16.042051][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.042327][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.042617][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.042895][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4ffe134
[ 16.043203][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.043504][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.043783][ T12] FS: 0000000000000000(0000) GS:ffff888087210000(0000) knlGS:0000000000000000
[ 16.044094][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.044360][ T12] CR2: 00007fbf769051a0 CR3: 000000000a6e0004 CR4: 0000000000772ef0
[ 16.044649][ T12] PKRU: 55555554
[ 16.044794][ T12] Call Trace:
[ 16.044927][ T12]
[ 16.045024][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.045243][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.045443][ T12] ? generic_xdp_install+0x410/0x410
[ 16.045636][ T12] ops_undo_list+0x714/0x890
[ 16.045819][ T12] ? netns_get+0x110/0x110
[ 16.045989][ T12] ? cleanup_net+0x2d6/0x830
[ 16.046177][ T12] cleanup_net+0x3b2/0x830
[ 16.046375][ T12] ? net_passive_dec+0x190/0x190
[ 16.046566][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.046750][ T12] process_one_work+0xe35/0x1650
[ 16.046931][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.047111][ T12] ? assign_work+0x168/0x240
[ 16.047330][ T12] worker_thread+0x591/0xcf0
[ 16.047568][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.047744][ T12] kthread+0x37b/0x5f0
[ 16.047869][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.048067][ T12] ? ret_from_fork+0x1b/0x270
[ 16.048279][ T12] ? __lock_release+0x5d/0x170
[ 16.048469][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.048673][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.048857][ T12] ret_from_fork+0x1db/0x270
[ 16.049036][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.049244][ T12] ret_from_fork_asm+0x11/0x20
[ 16.049440][ T12]
[ 16.049603][ T12] irq event stamp: 4079
[ 16.049753][ T12] hardirqs last enabled at (4079): [] irqentry_exit+0x3b/0x80
[ 16.050066][ T12] hardirqs last disabled at (4078): [] handle_softirqs+0x47f/0x610
[ 16.050423][ T12] softirqs last enabled at (3214): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 16.050802][ T12] softirqs last disabled at (3212): [] dev_mc_flush+0x54/0x90
[ 16.051113][ T12] ---[ end trace 0000000000000000 ]---