[ 16.869241][ T12] ==================================================================
[ 16.869702][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.869969][ T12] Read of size 1 at addr ffff888006e21694 by task kworker/u16:0/12
[ 16.870229][ T12]
[ 16.870361][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.870368][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.870371][ T12] Workqueue: netns cleanup_net
[ 16.870380][ T12] Call Trace:
[ 16.870382][ T12]
[ 16.870386][ T12] dump_stack_lvl+0x82/0xc0
[ 16.870392][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.870401][ T12] ? kobject_put+0xbb/0xd0
[ 16.870405][ T12] print_report+0xb4/0x270
[ 16.870409][ T12] ? kobject_put+0xbb/0xd0
[ 16.870412][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.870416][ T12] ? kobject_put+0xbb/0xd0
[ 16.870419][ T12] kasan_report+0xca/0x100
[ 16.870423][ T12] ? kobject_put+0xbb/0xd0
[ 16.870428][ T12] kobject_put+0xbb/0xd0
[ 16.870431][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.870438][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.870442][ T12] ? generic_xdp_install+0x410/0x410
[ 16.870454][ T12] ops_undo_list+0x714/0x890
[ 16.870460][ T12] ? netns_get+0x110/0x110
[ 16.870463][ T12] ? cleanup_net+0x2d6/0x830
[ 16.870470][ T12] cleanup_net+0x3b2/0x830
[ 16.870474][ T12] ? net_passive_dec+0x190/0x190
[ 16.870477][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.870484][ T12] process_one_work+0xe35/0x1650
[ 16.870492][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.870497][ T12] ? assign_work+0x168/0x240
[ 16.870502][ T12] worker_thread+0x591/0xcf0
[ 16.870507][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.870510][ T12] kthread+0x37b/0x5f0
[ 16.870514][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.870516][ T12] ? ret_from_fork+0x1b/0x270
[ 16.870522][ T12] ? __lock_release+0x5d/0x170
[ 16.870529][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.870531][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.870535][ T12] ret_from_fork+0x1db/0x270
[ 16.870538][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.870540][ T12] ret_from_fork_asm+0x11/0x20
[ 16.870550][ T12]
[ 16.870551][ T12]
[ 16.877177][ T12] Allocated by task 228:
[ 16.877306][ T12] kasan_save_stack+0x24/0x40
[ 16.877481][ T12] kasan_save_track+0x14/0x30
[ 16.877638][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.877797][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.877957][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 16.878121][ T12] sit_init_net+0x169/0x550
[ 16.878299][ T12] ops_init+0x189/0x550
[ 16.878426][ T12] setup_net+0xf1/0x380
[ 16.878584][ T12] copy_net_ns+0x21a/0x380
[ 16.878765][ T12] create_new_namespaces+0x35f/0x900
[ 16.878929][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 16.879094][ T12] ksys_unshare+0x2a3/0x660
[ 16.879264][ T12] __x64_sys_unshare+0x31/0x40
[ 16.879427][ T12] do_syscall_64+0xc1/0xfd0
[ 16.879608][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.879818][ T12]
[ 16.879907][ T12] Freed by task 12:
[ 16.880037][ T12] kasan_save_stack+0x24/0x40
[ 16.880215][ T12] kasan_save_track+0x14/0x30
[ 16.880387][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.880573][ T12] __kasan_slab_free+0x3f/0x60
[ 16.880746][ T12] kfree+0x21d/0x540
[ 16.880885][ T12] device_release+0x9c/0x210
[ 16.881062][ T12] kobject_cleanup+0xfe/0x360
[ 16.881228][ T12] netdev_run_todo+0x81f/0xc60
[ 16.881398][ T12] ops_undo_list+0x714/0x890
[ 16.881570][ T12] cleanup_net+0x3b2/0x830
[ 16.881735][ T12] process_one_work+0xe35/0x1650
[ 16.881894][ T12] worker_thread+0x591/0xcf0
[ 16.882059][ T12] kthread+0x37b/0x5f0
[ 16.882183][ T12] ret_from_fork+0x1db/0x270
[ 16.882398][ T12] ret_from_fork_asm+0x11/0x20
[ 16.882589][ T12]
[ 16.882681][ T12] The buggy address belongs to the object at ffff888006e21000
[ 16.882681][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.883085][ T12] The buggy address is located 1684 bytes inside of
[ 16.883085][ T12] freed 4096-byte region [ffff888006e21000, ffff888006e22000)
[ 16.883525][ T12]
[ 16.883611][ T12] The buggy address belongs to the physical page:
[ 16.883838][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6e20
[ 16.884247][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.884564][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.884910][ T12] page_type: f5(slab)
[ 16.885094][ T12] raw: 0080000000000040 ffff888001043700 ffffea00001b7410 ffffea0000277010
[ 16.885494][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.885803][ T12] head: 0080000000000040 ffff888001043700 ffffea00001b7410 ffffea0000277010
[ 16.886093][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.886402][ T12] head: 0080000000000003 ffffea00001b8801 00000000ffffffff 00000000ffffffff
[ 16.886736][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.887024][ T12] page dumped because: kasan: bad access detected
[ 16.887240][ T12]
[ 16.887421][ T12] Memory state around the buggy address:
[ 16.887620][ T12] ffff888006e21580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.887854][ T12] ffff888006e21600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.888200][ T12] >ffff888006e21680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.888446][ T12] ^
[ 16.888607][ T12] ffff888006e21700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.888933][ T12] ffff888006e21780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.889180][ T12] ==================================================================
[ 16.890570][ T12] Disabling lock debugging due to kernel taint
[ 16.890825][ T12] ------------[ cut here ]------------
[ 16.890979][ T12] refcount_t: underflow; use-after-free.
[ 16.891203][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.891554][ T12] Modules linked in: veth
[ 16.891700][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.892083][ T12] Tainted: [B]=BAD_PAGE
[ 16.892253][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.892465][ T12] Workqueue: netns cleanup_net
[ 16.892649][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.892870][ 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 45 91 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
[ 16.893532][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.893763][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.894094][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.894396][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff23be134
[ 16.894664][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.894931][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.895187][ T12] FS: 0000000000000000(0000) GS:ffff8880a3010000(0000) knlGS:0000000000000000
[ 16.896076][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.896394][ T12] CR2: 00007fa61fc52b40 CR3: 000000000955a006 CR4: 0000000000772ef0
[ 16.896688][ T12] PKRU: 55555554
[ 16.896815][ T12] Call Trace:
[ 16.896943][ T12]
[ 16.897037][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.897306][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.897503][ T12] ? generic_xdp_install+0x410/0x410
[ 16.897679][ T12] ops_undo_list+0x714/0x890
[ 16.897866][ T12] ? netns_get+0x110/0x110
[ 16.898031][ T12] ? cleanup_net+0x2d6/0x830
[ 16.898290][ T12] cleanup_net+0x3b2/0x830
[ 16.898468][ T12] ? net_passive_dec+0x190/0x190
[ 16.898651][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.898836][ T12] process_one_work+0xe35/0x1650
[ 16.899005][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.899172][ T12] ? assign_work+0x168/0x240
[ 16.899422][ T12] worker_thread+0x591/0xcf0
[ 16.899604][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.899775][ T12] kthread+0x37b/0x5f0
[ 16.899902][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.900064][ T12] ? ret_from_fork+0x1b/0x270
[ 16.900350][ T12] ? __lock_release+0x5d/0x170
[ 16.900537][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.900709][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.900881][ T12] ret_from_fork+0x1db/0x270
[ 16.901051][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.901307][ T12] ret_from_fork_asm+0x11/0x20
[ 16.901492][ T12]
[ 16.901635][ T12] irq event stamp: 3313
[ 16.901763][ T12] hardirqs last enabled at (3313): [] finish_task_switch.isra.0+0x245/0x960
[ 16.902100][ T12] hardirqs last disabled at (3312): [] __schedule+0x94a/0x1b10
[ 16.902481][ T12] softirqs last enabled at (3208): [] handle_softirqs+0x352/0x610
[ 16.902790][ T12] softirqs last disabled at (3201): [] irq_exit_rcu+0xab/0x100
[ 16.903086][ T12] ---[ end trace 0000000000000000 ]---