[ 18.062440][ T12] ==================================================================
[ 18.062750][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 18.062993][ T12] Read of size 1 at addr ffff8880083f96c4 by task kworker/u16:0/12
[ 18.063224][ T12]
[ 18.063317][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.063323][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.063326][ T12] Workqueue: netns cleanup_net
[ 18.063336][ T12] Call Trace:
[ 18.063338][ T12]
[ 18.063341][ T12] dump_stack_lvl+0x82/0xc0
[ 18.063347][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 18.063355][ T12] ? kobject_put+0xbb/0xd0
[ 18.063359][ T12] print_report+0xb4/0x270
[ 18.063363][ T12] ? kobject_put+0xbb/0xd0
[ 18.063365][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 18.063369][ T12] ? kobject_put+0xbb/0xd0
[ 18.063373][ T12] kasan_report+0xca/0x100
[ 18.063377][ T12] ? kobject_put+0xbb/0xd0
[ 18.063382][ T12] kobject_put+0xbb/0xd0
[ 18.063386][ T12] netdev_run_todo+0x5f0/0xc60
[ 18.063392][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 18.063396][ T12] ? generic_xdp_install+0x410/0x410
[ 18.063399][ T12] ? net_generic+0xb1/0x1f0
[ 18.063408][ T12] ops_undo_list+0x714/0x890
[ 18.063414][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 18.063417][ T12] ? cleanup_net+0x2d6/0x8b0
[ 18.063423][ T12] cleanup_net+0x3b2/0x8b0
[ 18.063427][ T12] ? net_passive_dec+0x190/0x190
[ 18.063432][ T12] ? rcu_is_watching+0x12/0xb0
[ 18.063440][ T12] process_one_work+0xe35/0x1650
[ 18.063450][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 18.063456][ T12] ? assign_work+0x168/0x240
[ 18.063460][ T12] worker_thread+0x591/0xcf0
[ 18.063466][ T12] ? rescuer_thread+0xd10/0xd10
[ 18.063470][ T12] kthread+0x37b/0x5f0
[ 18.063474][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.063477][ T12] ? ret_from_fork+0x1b/0x270
[ 18.063482][ T12] ? __lock_release+0x5d/0x170
[ 18.063487][ T12] ? rcu_is_watching+0x12/0xb0
[ 18.063491][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.063495][ T12] ret_from_fork+0x1db/0x270
[ 18.063497][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.063501][ T12] ret_from_fork_asm+0x11/0x20
[ 18.063511][ T12]
[ 18.063513][ T12]
[ 18.069640][ T12] Allocated by task 261:
[ 18.069761][ T12] kasan_save_stack+0x24/0x40
[ 18.069923][ T12] kasan_save_track+0x14/0x30
[ 18.070074][ T12] __kasan_kmalloc+0x7b/0x90
[ 18.070228][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 18.070383][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 18.070548][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 18.070705][ T12] ops_init+0x189/0x550
[ 18.070819][ T12] setup_net+0xf1/0x380
[ 18.070938][ T12] copy_net_ns+0x253/0x510
[ 18.071091][ T12] create_new_namespaces+0x35f/0x900
[ 18.071252][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 18.071403][ T12] ksys_unshare+0x2be/0x6e0
[ 18.071572][ T12] __x64_sys_unshare+0x31/0x40
[ 18.071725][ T12] do_syscall_64+0xc1/0xfd0
[ 18.071883][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.072078][ T12]
[ 18.072157][ T12] Freed by task 12:
[ 18.072272][ T12] kasan_save_stack+0x24/0x40
[ 18.072428][ T12] kasan_save_track+0x14/0x30
[ 18.072595][ T12] __kasan_save_free_info+0x3b/0x60
[ 18.072753][ T12] __kasan_slab_free+0x3f/0x60
[ 18.072907][ T12] kfree+0x21d/0x540
[ 18.073022][ T12] device_release+0x9c/0x210
[ 18.073182][ T12] kobject_cleanup+0xfe/0x360
[ 18.073342][ T12] netdev_run_todo+0x81f/0xc60
[ 18.073499][ T12] ops_undo_list+0x714/0x890
[ 18.073664][ T12] cleanup_net+0x3b2/0x8b0
[ 18.073821][ T12] process_one_work+0xe35/0x1650
[ 18.073973][ T12] worker_thread+0x591/0xcf0
[ 18.074130][ T12] kthread+0x37b/0x5f0
[ 18.074251][ T12] ret_from_fork+0x1db/0x270
[ 18.074408][ T12] ret_from_fork_asm+0x11/0x20
[ 18.074583][ T12]
[ 18.074662][ T12] The buggy address belongs to the object at ffff8880083f9000
[ 18.074662][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 18.075030][ T12] The buggy address is located 1732 bytes inside of
[ 18.075030][ T12] freed 4096-byte region [ffff8880083f9000, ffff8880083fa000)
[ 18.075400][ T12]
[ 18.075491][ T12] The buggy address belongs to the physical page:
[ 18.075700][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x83f8
[ 18.075979][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 18.076214][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 18.076409][ T12] page_type: f5(slab)
[ 18.076529][ T12] raw: 0080000000000040 ffff888001043700 ffffea000022a410 ffffea0000232810
[ 18.076827][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 18.077094][ T12] head: 0080000000000040 ffff888001043700 ffffea000022a410 ffffea0000232810
[ 18.077372][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 18.077834][ T12] head: 0080000000000003 ffffea000020fe01 00000000ffffffff 00000000ffffffff
[ 18.078107][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 18.078469][ T12] page dumped because: kasan: bad access detected
[ 18.078677][ T12]
[ 18.078754][ T12] Memory state around the buggy address:
[ 18.078901][ T12] ffff8880083f9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.079213][ T12] ffff8880083f9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.079432][ T12] >ffff8880083f9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.079791][ T12] ^
[ 18.079988][ T12] ffff8880083f9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.080205][ T12] ffff8880083f9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.080601][ T12] ==================================================================
[ 18.080992][ T12] Disabling lock debugging due to kernel taint
[ 18.081765][ T12] ------------[ cut here ]------------
[ 18.081917][ T12] refcount_t: underflow; use-after-free.
[ 18.082101][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 18.082917][ T12] Modules linked in:
[ 18.083046][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.083450][ T12] Tainted: [B]=BAD_PAGE
[ 18.083568][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.083769][ T12] Workqueue: netns cleanup_net
[ 18.083940][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 18.084136][ T12] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba c5 9b e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
[ 18.084734][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282
[ 18.084938][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 18.085233][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 18.085460][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3980934
[ 18.085703][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 18.085939][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 18.086234][ T12] FS: 0000000000000000(0000) GS:ffff8880cf088000(0000) knlGS:0000000000000000
[ 18.086492][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 18.086682][ T12] CR2: 0000555b30c93dec CR3: 0000000029349003 CR4: 0000000000772ef0
[ 18.086919][ T12] PKRU: 55555554
[ 18.087033][ T12] Call Trace:
[ 18.087200][ T12]
[ 18.087287][ T12] netdev_run_todo+0x5f0/0xc60
[ 18.087445][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 18.087597][ T12] ? generic_xdp_install+0x410/0x410
[ 18.087747][ T12] ? net_generic+0xb1/0x1f0
[ 18.087914][ T12] ops_undo_list+0x714/0x890
[ 18.088069][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 18.088289][ T12] ? cleanup_net+0x2d6/0x8b0
[ 18.088445][ T12] cleanup_net+0x3b2/0x8b0
[ 18.088604][ T12] ? net_passive_dec+0x190/0x190
[ 18.088754][ T12] ? rcu_is_watching+0x12/0xb0
[ 18.088920][ T12] process_one_work+0xe35/0x1650
[ 18.089074][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 18.089288][ T12] ? assign_work+0x168/0x240
[ 18.089438][ T12] worker_thread+0x591/0xcf0
[ 18.089591][ T12] ? rescuer_thread+0xd10/0xd10
[ 18.089742][ T12] kthread+0x37b/0x5f0
[ 18.089866][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.090026][ T12] ? ret_from_fork+0x1b/0x270
[ 18.090244][ T12] ? __lock_release+0x5d/0x170
[ 18.090399][ T12] ? rcu_is_watching+0x12/0xb0
[ 18.090547][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.090698][ T12] ret_from_fork+0x1db/0x270
[ 18.090846][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.091007][ T12] ret_from_fork_asm+0x11/0x20
[ 18.091320][ T12]
[ 18.091438][ T12] irq event stamp: 18433
[ 18.091554][ T12] hardirqs last enabled at (18433): [] finish_task_switch.isra.0+0x245/0x960
[ 18.091854][ T12] hardirqs last disabled at (18432): [] __schedule+0x94a/0x1b10
[ 18.092126][ T12] softirqs last enabled at (17580): [] unregister_netdevice_many_notify+0x714/0x1c90
[ 18.092489][ T12] softirqs last disabled at (17578): [] dev_mc_flush+0x54/0x90
[ 18.092747][ T12] ---[ end trace 0000000000000000 ]---