[ 16.179364][ T12] ==================================================================
[ 16.179925][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.180404][ T12] Read of size 1 at addr ffff888005e5c694 by task kworker/u16:0/12
[ 16.180851][ T12]
[ 16.180999][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.181007][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.181012][ T12] Workqueue: netns cleanup_net
[ 16.181028][ T12] Call Trace:
[ 16.181031][ T12]
[ 16.181037][ T12] dump_stack_lvl+0x82/0xc0
[ 16.181048][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.181059][ T12] ? kobject_put+0xbb/0xd0
[ 16.181066][ T12] print_report+0xb4/0x270
[ 16.181072][ T12] ? kobject_put+0xbb/0xd0
[ 16.181076][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.181083][ T12] ? kobject_put+0xbb/0xd0
[ 16.181087][ T12] kasan_report+0xca/0x100
[ 16.181094][ T12] ? kobject_put+0xbb/0xd0
[ 16.181104][ T12] kobject_put+0xbb/0xd0
[ 16.181109][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.181120][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.181126][ T12] ? generic_xdp_install+0x410/0x410
[ 16.181139][ T12] ops_undo_list+0x714/0x890
[ 16.181147][ T12] ? netns_get+0x110/0x110
[ 16.181151][ T12] ? cleanup_net+0x2d6/0x830
[ 16.181160][ T12] cleanup_net+0x3b2/0x830
[ 16.181166][ T12] ? net_passive_dec+0x190/0x190
[ 16.181173][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.181185][ T12] process_one_work+0xe35/0x1650
[ 16.181205][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.181215][ T12] ? assign_work+0x168/0x240
[ 16.181222][ T12] worker_thread+0x591/0xcf0
[ 16.181233][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.181239][ T12] kthread+0x37b/0x5f0
[ 16.181248][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.181252][ T12] ? ret_from_fork+0x1b/0x270
[ 16.181260][ T12] ? __lock_release+0x5d/0x170
[ 16.181271][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.181275][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.181281][ T12] ret_from_fork+0x1db/0x270
[ 16.181286][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.181291][ T12] ret_from_fork_asm+0x11/0x20
[ 16.181307][ T12]
[ 16.181309][ T12]
[ 16.192081][ T12] Allocated by task 229:
[ 16.192305][ T12] kasan_save_stack+0x24/0x40
[ 16.192595][ T12] kasan_save_track+0x14/0x30
[ 16.192856][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.193119][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.193403][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 16.193705][ T12] sit_init_net+0x169/0x550
[ 16.193997][ T12] ops_init+0x189/0x550
[ 16.194203][ T12] setup_net+0xf1/0x380
[ 16.194397][ T12] copy_net_ns+0x21a/0x380
[ 16.194665][ T12] create_new_namespaces+0x35f/0x900
[ 16.194938][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 16.195204][ T12] ksys_unshare+0x2a3/0x660
[ 16.195480][ T12] __x64_sys_unshare+0x31/0x40
[ 16.195748][ T12] do_syscall_64+0xc1/0xfd0
[ 16.196026][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.196370][ T12]
[ 16.196506][ T12] Freed by task 12:
[ 16.196743][ T12] kasan_save_stack+0x24/0x40
[ 16.197007][ T12] kasan_save_track+0x14/0x30
[ 16.197294][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.197568][ T12] __kasan_slab_free+0x3f/0x60
[ 16.197858][ T12] kfree+0x21d/0x540
[ 16.198054][ T12] device_release+0x9c/0x210
[ 16.198321][ T12] kobject_cleanup+0xfe/0x360
[ 16.198600][ T12] netdev_run_todo+0x81f/0xc60
[ 16.198863][ T12] ops_undo_list+0x714/0x890
[ 16.199121][ T12] cleanup_net+0x3b2/0x830
[ 16.199385][ T12] process_one_work+0xe35/0x1650
[ 16.199659][ T12] worker_thread+0x591/0xcf0
[ 16.199933][ T12] kthread+0x37b/0x5f0
[ 16.200141][ T12] ret_from_fork+0x1db/0x270
[ 16.200404][ T12] ret_from_fork_asm+0x11/0x20
[ 16.200663][ T12]
[ 16.200806][ T12] The buggy address belongs to the object at ffff888005e5c000
[ 16.200806][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.201515][ T12] The buggy address is located 1684 bytes inside of
[ 16.201515][ T12] freed 4096-byte region [ffff888005e5c000, ffff888005e5d000)
[ 16.202180][ T12]
[ 16.202313][ T12] The buggy address belongs to the physical page:
[ 16.202637][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e58
[ 16.203154][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.203620][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.203991][ T12] page_type: f5(slab)
[ 16.204207][ T12] raw: 0080000000000040 ffff888001043700 ffffea000016ee10 ffffea0000099610
[ 16.204722][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.205206][ T12] head: 0080000000000040 ffff888001043700 ffffea000016ee10 ffffea0000099610
[ 16.205728][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.206203][ T12] head: 0080000000000003 ffffea0000179601 00000000ffffffff 00000000ffffffff
[ 16.206691][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.207167][ T12] page dumped because: kasan: bad access detected
[ 16.207497][ T12]
[ 16.207642][ T12] Memory state around the buggy address:
[ 16.207900][ T12] ffff888005e5c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.208301][ T12] ffff888005e5c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.208686][ T12] >ffff888005e5c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.209068][ T12] ^
[ 16.209336][ T12] ffff888005e5c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.209725][ T12] ffff888005e5c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.210104][ T12] ==================================================================
[ 16.210560][ T12] Disabling lock debugging due to kernel taint
[ 16.210886][ T12] ------------[ cut here ]------------
[ 16.211133][ T12] refcount_t: underflow; use-after-free.
[ 16.211459][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.211947][ T12] Modules linked in: veth
[ 16.212171][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.212788][ T12] Tainted: [B]=BAD_PAGE
[ 16.212996][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.213332][ T12] Workqueue: netns cleanup_net
[ 16.213631][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.213971][ 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 a5 97 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
[ 16.214924][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.215256][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.215669][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.216065][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff307e134
[ 16.216488][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.216928][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.217292][ T12] FS: 0000000000000000(0000) GS:ffff88809ca10000(0000) knlGS:0000000000000000
[ 16.217770][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.218091][ T12] CR2: 00007f968f8fb920 CR3: 0000000008f60006 CR4: 0000000000772ef0
[ 16.218507][ T12] PKRU: 55555554
[ 16.218719][ T12] Call Trace:
[ 16.218915][ T12]
[ 16.219048][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.219316][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.219590][ T12] ? generic_xdp_install+0x410/0x410
[ 16.219854][ T12] ops_undo_list+0x714/0x890
[ 16.220289][ T12] ? netns_get+0x110/0x110
[ 16.220545][ T12] ? cleanup_net+0x2d6/0x830
[ 16.220798][ T12] cleanup_net+0x3b2/0x830
[ 16.221040][ T12] ? net_passive_dec+0x190/0x190
[ 16.221484][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.221738][ T12] process_one_work+0xe35/0x1650
[ 16.222006][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.222258][ T12] ? assign_work+0x168/0x240
[ 16.222525][ T12] worker_thread+0x591/0xcf0
[ 16.222783][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.223041][ T12] kthread+0x37b/0x5f0
[ 16.223247][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.223535][ T12] ? ret_from_fork+0x1b/0x270
[ 16.223785][ T12] ? __lock_release+0x5d/0x170
[ 16.224055][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.224299][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.224561][ T12] ret_from_fork+0x1db/0x270
[ 16.224988][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.225242][ T12] ret_from_fork_asm+0x11/0x20
[ 16.225515][ T12]
[ 16.225708][ T12] irq event stamp: 3401
[ 16.225901][ T12] hardirqs last enabled at (3401): [] irqentry_exit+0x3b/0x80
[ 16.226357][ T12] hardirqs last disabled at (3400): [] handle_softirqs+0x47f/0x610
[ 16.227117][ T12] softirqs last enabled at (3390): [] handle_softirqs+0x352/0x610
[ 16.227564][ T12] softirqs last disabled at (3385): [] irq_exit_rcu+0xab/0x100
[ 16.228040][ T12] ---[ end trace 0000000000000000 ]---