[ 16.676450][ T12] ==================================================================
[ 16.676829][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.677083][ T12] Read of size 1 at addr ffff888005b64694 by task kworker/u16:0/12
[ 16.677359][ T12]
[ 16.677453][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.677459][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.677463][ T12] Workqueue: netns cleanup_net
[ 16.677470][ T12] Call Trace:
[ 16.677473][ T12]
[ 16.677477][ T12] dump_stack_lvl+0x82/0xc0
[ 16.677485][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.677496][ T12] ? kobject_put+0xbb/0xd0
[ 16.677499][ T12] print_report+0xb4/0x270
[ 16.677503][ T12] ? kobject_put+0xbb/0xd0
[ 16.677506][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.677510][ T12] ? kobject_put+0xbb/0xd0
[ 16.677513][ T12] kasan_report+0xca/0x100
[ 16.677517][ T12] ? kobject_put+0xbb/0xd0
[ 16.677522][ T12] kobject_put+0xbb/0xd0
[ 16.677526][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.677532][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.677536][ T12] ? generic_xdp_install+0x410/0x410
[ 16.677543][ T12] ops_undo_list+0x714/0x890
[ 16.677547][ T12] ? netns_get+0x110/0x110
[ 16.677549][ T12] ? cleanup_net+0x2d6/0x830
[ 16.677554][ T12] cleanup_net+0x3b2/0x830
[ 16.677557][ T12] ? net_passive_dec+0x190/0x190
[ 16.677560][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.677567][ T12] process_one_work+0xe35/0x1650
[ 16.677574][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.677579][ T12] ? assign_work+0x168/0x240
[ 16.677583][ T12] worker_thread+0x591/0xcf0
[ 16.677592][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.677597][ T12] kthread+0x37b/0x5f0
[ 16.677602][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.677605][ T12] ? ret_from_fork+0x1b/0x270
[ 16.677613][ T12] ? __lock_release+0x5d/0x170
[ 16.677620][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.677624][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.677630][ T12] ret_from_fork+0x1db/0x270
[ 16.677633][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.677636][ T12] ret_from_fork_asm+0x11/0x20
[ 16.677645][ T12]
[ 16.677646][ T12]
[ 16.684963][ T12] Allocated by task 229:
[ 16.685217][ T12] kasan_save_stack+0x24/0x40
[ 16.685476][ T12] kasan_save_track+0x14/0x30
[ 16.685684][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.685859][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.686122][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 16.686356][ T12] sit_init_net+0x169/0x550
[ 16.686556][ T12] ops_init+0x189/0x550
[ 16.686695][ T12] setup_net+0xf1/0x380
[ 16.686911][ T12] copy_net_ns+0x21a/0x380
[ 16.687080][ T12] create_new_namespaces+0x35f/0x900
[ 16.687297][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 16.687480][ T12] ksys_unshare+0x2a3/0x660
[ 16.687763][ T12] __x64_sys_unshare+0x31/0x40
[ 16.687937][ T12] do_syscall_64+0xc1/0xfd0
[ 16.688112][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.688347][ T12]
[ 16.688451][ T12] Freed by task 12:
[ 16.688679][ T12] kasan_save_stack+0x24/0x40
[ 16.688896][ T12] kasan_save_track+0x14/0x30
[ 16.689070][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.689259][ T12] __kasan_slab_free+0x3f/0x60
[ 16.689542][ T12] kfree+0x21d/0x540
[ 16.689691][ T12] device_release+0x9c/0x210
[ 16.689870][ T12] kobject_cleanup+0xfe/0x360
[ 16.690041][ T12] netdev_run_todo+0x81f/0xc60
[ 16.690348][ T12] ops_undo_list+0x714/0x890
[ 16.690531][ T12] cleanup_net+0x3b2/0x830
[ 16.690726][ T12] process_one_work+0xe35/0x1650
[ 16.690932][ T12] worker_thread+0x591/0xcf0
[ 16.691201][ T12] kthread+0x37b/0x5f0
[ 16.691354][ T12] ret_from_fork+0x1db/0x270
[ 16.691594][ T12] ret_from_fork_asm+0x11/0x20
[ 16.691794][ T12]
[ 16.691887][ T12] The buggy address belongs to the object at ffff888005b64000
[ 16.691887][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.692459][ T12] The buggy address is located 1684 bytes inside of
[ 16.692459][ T12] freed 4096-byte region [ffff888005b64000, ffff888005b65000)
[ 16.693042][ T12]
[ 16.693132][ T12] The buggy address belongs to the physical page:
[ 16.693350][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5b60
[ 16.693820][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.694083][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.694322][ T12] page_type: f5(slab)
[ 16.694496][ T12] raw: 0080000000000040 ffff888001043700 ffffea000020fe10 ffffea00001d3a10
[ 16.694987][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.695303][ T12] head: 0080000000000040 ffff888001043700 ffffea000020fe10 ffffea00001d3a10
[ 16.695755][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.696070][ T12] head: 0080000000000003 ffffea000016d801 00000000ffffffff 00000000ffffffff
[ 16.696572][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.696902][ T12] page dumped because: kasan: bad access detected
[ 16.697123][ T12]
[ 16.697244][ T12] Memory state around the buggy address:
[ 16.697610][ T12] ffff888005b64580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.697888][ T12] ffff888005b64600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.698148][ T12] >ffff888005b64680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.698404][ T12] ^
[ 16.698573][ T12] ffff888005b64700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.698885][ T12] ffff888005b64780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.699264][ T12] ==================================================================
[ 16.699715][ T12] Disabling lock debugging due to kernel taint
[ 16.699990][ T12] ------------[ cut here ]------------
[ 16.700437][ T12] refcount_t: underflow; use-after-free.
[ 16.700667][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.701058][ T12] Modules linked in: veth
[ 16.701266][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.701721][ T12] Tainted: [B]=BAD_PAGE
[ 16.701849][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.702127][ T12] Workqueue: netns cleanup_net
[ 16.702363][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.702647][ 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 05 a2 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
[ 16.703533][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.703885][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.704209][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.704518][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff453e134
[ 16.704911][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.705222][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.705627][ T12] FS: 0000000000000000(0000) GS:ffff888092410000(0000) knlGS:0000000000000000
[ 16.705993][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.706256][ T12] CR2: 0000561e0b3307b8 CR3: 000000000bb73006 CR4: 0000000000772ef0
[ 16.706754][ T12] PKRU: 55555554
[ 16.706918][ T12] Call Trace:
[ 16.707075][ T12]
[ 16.707204][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.707419][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.707726][ T12] ? generic_xdp_install+0x410/0x410
[ 16.707931][ T12] ops_undo_list+0x714/0x890
[ 16.708142][ T12] ? netns_get+0x110/0x110
[ 16.708342][ T12] ? cleanup_net+0x2d6/0x830
[ 16.708640][ T12] cleanup_net+0x3b2/0x830
[ 16.708852][ T12] ? net_passive_dec+0x190/0x190
[ 16.709059][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.709275][ T12] process_one_work+0xe35/0x1650
[ 16.709567][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.709790][ T12] ? assign_work+0x168/0x240
[ 16.709983][ T12] worker_thread+0x591/0xcf0
[ 16.710153][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.710310][ T12] kthread+0x37b/0x5f0
[ 16.710477][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.710691][ T12] ? ret_from_fork+0x1b/0x270
[ 16.710892][ T12] ? __lock_release+0x5d/0x170
[ 16.711205][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.711417][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.711623][ T12] ret_from_fork+0x1db/0x270
[ 16.711827][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.712150][ T12] ret_from_fork_asm+0x11/0x20
[ 16.712357][ T12]
[ 16.712517][ T12] irq event stamp: 3601
[ 16.712688][ T12] hardirqs last enabled at (3601): [] finish_task_switch.isra.0+0x245/0x960
[ 16.713191][ T12] hardirqs last disabled at (3600): [] __schedule+0x94a/0x1b10
[ 16.713539][ T12] softirqs last enabled at (3264): [] handle_softirqs+0x352/0x610
[ 16.713986][ T12] softirqs last disabled at (2773): [] irq_exit_rcu+0xab/0x100
[ 16.714361][ T12] ---[ end trace 0000000000000000 ]---