[ 170.449501][ T12] ==================================================================
[ 170.449816][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 170.450094][ T12] Read of size 1 at addr ffff8880096a96ac by task kworker/u16:0/12
[ 170.450347][ T12]
[ 170.450444][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 170.450449][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 170.450452][ T12] Workqueue: netns cleanup_net
[ 170.450458][ T12] Call Trace:
[ 170.450460][ T12]
[ 170.450463][ T12] dump_stack_lvl+0x82/0xc0
[ 170.450469][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 170.450476][ T12] ? kobject_put+0xbb/0xd0
[ 170.450480][ T12] print_report+0xb4/0x270
[ 170.450484][ T12] ? kobject_put+0xbb/0xd0
[ 170.450487][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 170.450491][ T12] ? kobject_put+0xbb/0xd0
[ 170.450494][ T12] kasan_report+0xca/0x100
[ 170.450499][ T12] ? kobject_put+0xbb/0xd0
[ 170.450504][ T12] kobject_put+0xbb/0xd0
[ 170.450508][ T12] netdev_run_todo+0x5f0/0xc60
[ 170.450513][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 170.450517][ T12] ? generic_xdp_install+0x410/0x410
[ 170.450524][ T12] ops_undo_list+0x714/0x890
[ 170.450531][ T12] ? netns_get+0x110/0x110
[ 170.450534][ T12] ? cleanup_net+0x2d6/0x830
[ 170.450540][ T12] cleanup_net+0x3b2/0x830
[ 170.450543][ T12] ? net_passive_dec+0x190/0x190
[ 170.450547][ T12] ? rcu_is_watching+0x12/0xb0
[ 170.450553][ T12] process_one_work+0xe35/0x1650
[ 170.450560][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 170.450566][ T12] ? assign_work+0x168/0x240
[ 170.450570][ T12] worker_thread+0x591/0xcf0
[ 170.450576][ T12] ? rescuer_thread+0xd10/0xd10
[ 170.450579][ T12] kthread+0x37b/0x5f0
[ 170.450583][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 170.450586][ T12] ? ret_from_fork+0x1b/0x270
[ 170.450592][ T12] ? __lock_release+0x5d/0x170
[ 170.450597][ T12] ? rcu_is_watching+0x12/0xb0
[ 170.450600][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 170.450603][ T12] ret_from_fork+0x1db/0x270
[ 170.450607][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 170.450609][ T12] ret_from_fork_asm+0x11/0x20
[ 170.450619][ T12]
[ 170.450620][ T12]
[ 170.457515][ T12] Allocated by task 253:
[ 170.457687][ T12] kasan_save_stack+0x24/0x40
[ 170.457901][ T12] kasan_save_track+0x14/0x30
[ 170.458110][ T12] __kasan_kmalloc+0x7b/0x90
[ 170.458309][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 170.458495][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 170.458674][ T12] sit_init_net+0x169/0x550
[ 170.458870][ T12] ops_init+0x189/0x550
[ 170.459008][ T12] setup_net+0xf1/0x380
[ 170.459147][ T12] copy_net_ns+0x21a/0x380
[ 170.459331][ T12] create_new_namespaces+0x35f/0x900
[ 170.459567][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 170.459764][ T12] ksys_unshare+0x2a3/0x660
[ 170.459964][ T12] __x64_sys_unshare+0x31/0x40
[ 170.460147][ T12] do_syscall_64+0xc1/0xfd0
[ 170.460328][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 170.460556][ T12]
[ 170.460653][ T12] Freed by task 12:
[ 170.460785][ T12] kasan_save_stack+0x24/0x40
[ 170.460973][ T12] kasan_save_track+0x14/0x30
[ 170.461164][ T12] __kasan_save_free_info+0x3b/0x60
[ 170.461359][ T12] __kasan_slab_free+0x3f/0x60
[ 170.461539][ T12] kfree+0x21d/0x540
[ 170.461680][ T12] device_release+0x9c/0x210
[ 170.461863][ T12] kobject_cleanup+0xfe/0x360
[ 170.462039][ T12] netdev_run_todo+0x81f/0xc60
[ 170.462223][ T12] ops_undo_list+0x714/0x890
[ 170.462424][ T12] cleanup_net+0x3b2/0x830
[ 170.462614][ T12] process_one_work+0xe35/0x1650
[ 170.462793][ T12] worker_thread+0x591/0xcf0
[ 170.462977][ T12] kthread+0x37b/0x5f0
[ 170.463116][ T12] ret_from_fork+0x1db/0x270
[ 170.463299][ T12] ret_from_fork_asm+0x11/0x20
[ 170.463488][ T12]
[ 170.463589][ T12] The buggy address belongs to the object at ffff8880096a9000
[ 170.463589][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 170.464022][ T12] The buggy address is located 1708 bytes inside of
[ 170.464022][ T12] freed 4096-byte region [ffff8880096a9000, ffff8880096aa000)
[ 170.464521][ T12]
[ 170.464619][ T12] The buggy address belongs to the physical page:
[ 170.464857][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x96a8
[ 170.465192][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 170.465518][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 170.465789][ T12] page_type: f5(slab)
[ 170.465965][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000149e10 ffffea0000245c10
[ 170.466308][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 170.466655][ T12] head: 0080000000000040 ffff888001043700 ffffea0000149e10 ffffea0000245c10
[ 170.467088][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 170.467463][ T12] head: 0080000000000003 ffffea000025aa01 00000000ffffffff 00000000ffffffff
[ 170.467819][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 170.468299][ T12] page dumped because: kasan: bad access detected
[ 170.468516][ T12]
[ 170.468607][ T12] Memory state around the buggy address:
[ 170.468774][ T12] ffff8880096a9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 170.469166][ T12] ffff8880096a9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 170.469437][ T12] >ffff8880096a9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 170.469730][ T12] ^
[ 170.470027][ T12] ffff8880096a9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 170.470321][ T12] ffff8880096a9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 170.470610][ T12] ==================================================================
[ 170.471893][ T12] Disabling lock debugging due to kernel taint
[ 170.472321][ T12] ------------[ cut here ]------------
[ 170.472536][ T12] refcount_t: underflow; use-after-free.
[ 170.472761][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 170.473851][ T12] Modules linked in: dummy veth nf_log_syslog nft_log nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nf_tables
[ 170.474402][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 170.474890][ T12] Tainted: [B]=BAD_PAGE
[ 170.475087][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 170.475391][ T12] Workqueue: netns cleanup_net
[ 170.475634][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 170.475914][ T12] Code: 83 90 02 80 fb 01 0f 87 95 6b d6 fe 83 e3 01 0f 85 51 ff ff ff c6 05 b1 83 90 02 01 90 48 c7 c7 a0 de 65 aa e8 c2 8b 15 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 f0 34 a1 ff e9 ba fe ff ff
[ 170.476632][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282
[ 170.476908][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 170.477236][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 170.477578][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff55fe220
[ 170.477983][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 170.478457][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 170.478889][ T12] FS: 0000000000000000(0000) GS:ffff888089eec000(0000) knlGS:0000000000000000
[ 170.479402][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 170.479787][ T12] CR2: 00007fb784577fe0 CR3: 0000000016335001 CR4: 0000000000772ef0
[ 170.480157][ T12] PKRU: 55555554
[ 170.480315][ T12] Call Trace:
[ 170.480471][ T12]
[ 170.480586][ T12] netdev_run_todo+0x5f0/0xc60
[ 170.480786][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 170.480995][ T12] ? generic_xdp_install+0x410/0x410
[ 170.481283][ T12] ops_undo_list+0x714/0x890
[ 170.481496][ T12] ? netns_get+0x110/0x110
[ 170.481690][ T12] ? cleanup_net+0x2d6/0x830
[ 170.481889][ T12] cleanup_net+0x3b2/0x830
[ 170.482097][ T12] ? net_passive_dec+0x190/0x190
[ 170.482289][ T12] ? rcu_is_watching+0x12/0xb0
[ 170.482490][ T12] process_one_work+0xe35/0x1650
[ 170.482692][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 170.482884][ T12] ? assign_work+0x168/0x240
[ 170.483179][ T12] worker_thread+0x591/0xcf0
[ 170.483376][ T12] ? rescuer_thread+0xd10/0xd10
[ 170.483575][ T12] kthread+0x37b/0x5f0
[ 170.483728][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 170.483918][ T12] ? ret_from_fork+0x1b/0x270
[ 170.484122][ T12] ? __lock_release+0x5d/0x170
[ 170.484323][ T12] ? rcu_is_watching+0x12/0xb0
[ 170.484529][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 170.484720][ T12] ret_from_fork+0x1db/0x270
[ 170.485007][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 170.485196][ T12] ret_from_fork_asm+0x11/0x20
[ 170.485455][ T12]
[ 170.485616][ T12] irq event stamp: 9369
[ 170.485770][ T12] hardirqs last enabled at (9369): [] finish_task_switch.isra.0+0x245/0x960
[ 170.486144][ T12] hardirqs last disabled at (9368): [] __schedule+0x94a/0x1b10
[ 170.486517][ T12] softirqs last enabled at (9280): [] handle_softirqs+0x352/0x610
[ 170.486922][ T12] softirqs last disabled at (9269): [] irq_exit_rcu+0xab/0x100
[ 170.487251][ T12] ---[ end trace 0000000000000000 ]---