[ 30.231359][ T327] ip (327) used greatest stack depth: 24688 bytes left
[ 30.511177][ T332] ip (332) used greatest stack depth: 24512 bytes left
[ 39.986900][ T12] ==================================================================
[ 39.987275][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 39.987557][ T12] Read of size 1 at addr ffff88800bfa96ac by task kworker/u16:0/12
[ 39.987812][ T12]
[ 39.987914][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 39.987920][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 39.987923][ T12] Workqueue: netns cleanup_net
[ 39.987931][ T12] Call Trace:
[ 39.987933][ T12]
[ 39.987936][ T12] dump_stack_lvl+0x82/0xc0
[ 39.987944][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 39.987963][ T12] ? kobject_put+0xbb/0xd0
[ 39.987974][ T12] print_report+0xb4/0x270
[ 39.987978][ T12] ? kobject_put+0xbb/0xd0
[ 39.987982][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 39.987986][ T12] ? kobject_put+0xbb/0xd0
[ 39.987989][ T12] kasan_report+0xca/0x100
[ 39.987994][ T12] ? kobject_put+0xbb/0xd0
[ 39.987999][ T12] kobject_put+0xbb/0xd0
[ 39.988003][ T12] netdev_run_todo+0x5f0/0xc60
[ 39.988009][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 39.988013][ T12] ? generic_xdp_install+0x410/0x410
[ 39.988020][ T12] ops_undo_list+0x714/0x890
[ 39.988028][ T12] ? netns_get+0x110/0x110
[ 39.988032][ T12] ? cleanup_net+0x2d6/0x830
[ 39.988037][ T12] cleanup_net+0x3b2/0x830
[ 39.988040][ T12] ? net_passive_dec+0x190/0x190
[ 39.988044][ T12] ? rcu_is_watching+0x12/0xb0
[ 39.988050][ T12] process_one_work+0xe35/0x1650
[ 39.988058][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 39.988064][ T12] ? assign_work+0x168/0x240
[ 39.988067][ T12] worker_thread+0x591/0xcf0
[ 39.988073][ T12] ? rescuer_thread+0xd10/0xd10
[ 39.988076][ T12] kthread+0x37b/0x5f0
[ 39.988080][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 39.988082][ T12] ? ret_from_fork+0x1b/0x270
[ 39.988089][ T12] ? __lock_release+0x5d/0x170
[ 39.988096][ T12] ? rcu_is_watching+0x12/0xb0
[ 39.988099][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 39.988102][ T12] ret_from_fork+0x1db/0x270
[ 39.988105][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 39.988108][ T12] ret_from_fork_asm+0x11/0x20
[ 39.988117][ T12]
[ 39.988118][ T12]
[ 39.994962][ T12] Allocated by task 326:
[ 39.995097][ T12] kasan_save_stack+0x24/0x40
[ 39.995312][ T12] kasan_save_track+0x14/0x30
[ 39.995485][ T12] __kasan_kmalloc+0x7b/0x90
[ 39.995658][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 39.995858][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 39.996063][ T12] sit_init_net+0x169/0x550
[ 39.996251][ T12] ops_init+0x189/0x550
[ 39.996387][ T12] setup_net+0xf1/0x380
[ 39.996522][ T12] copy_net_ns+0x21a/0x380
[ 39.996696][ T12] create_new_namespaces+0x35f/0x900
[ 39.996871][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 39.997051][ T12] ksys_unshare+0x2a3/0x660
[ 39.997236][ T12] __x64_sys_unshare+0x31/0x40
[ 39.997416][ T12] do_syscall_64+0xc1/0xfd0
[ 39.997597][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 39.997834][ T12]
[ 39.997923][ T12] Freed by task 12:
[ 39.998056][ T12] kasan_save_stack+0x24/0x40
[ 39.998250][ T12] kasan_save_track+0x14/0x30
[ 39.998442][ T12] __kasan_save_free_info+0x3b/0x60
[ 39.998618][ T12] __kasan_slab_free+0x3f/0x60
[ 39.998786][ T12] kfree+0x21d/0x540
[ 39.998918][ T12] device_release+0x9c/0x210
[ 39.999096][ T12] kobject_cleanup+0xfe/0x360
[ 39.999293][ T12] netdev_run_todo+0x81f/0xc60
[ 39.999479][ T12] ops_undo_list+0x714/0x890
[ 39.999748][ T12] cleanup_net+0x3b2/0x830
[ 39.999923][ T12] process_one_work+0xe35/0x1650
[ 40.000100][ T12] worker_thread+0x591/0xcf0
[ 40.000278][ T12] kthread+0x37b/0x5f0
[ 40.000406][ T12] ret_from_fork+0x1db/0x270
[ 40.000670][ T12] ret_from_fork_asm+0x11/0x20
[ 40.000850][ T12]
[ 40.000939][ T12] The buggy address belongs to the object at ffff88800bfa9000
[ 40.000939][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 40.001468][ T12] The buggy address is located 1708 bytes inside of
[ 40.001468][ T12] freed 4096-byte region [ffff88800bfa9000, ffff88800bfaa000)
[ 40.001878][ T12]
[ 40.001965][ T12] The buggy address belongs to the physical page:
[ 40.002271][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xbfa8
[ 40.002577][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 40.002937][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 40.003170][ T12] page_type: f5(slab)
[ 40.003305][ T12] raw: 0080000000000040 ffff888001043700 ffffea000016d210 ffffea00001f7410
[ 40.003703][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 40.004008][ T12] head: 0080000000000040 ffff888001043700 ffffea000016d210 ffffea00001f7410
[ 40.004347][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 40.004758][ T12] head: 0080000000000003 ffffea00002fea01 00000000ffffffff 00000000ffffffff
[ 40.005063][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 40.005466][ T12] page dumped because: kasan: bad access detected
[ 40.005676][ T12]
[ 40.005778][ T12] Memory state around the buggy address:
[ 40.005946][ T12] ffff88800bfa9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 40.006294][ T12] ffff88800bfa9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 40.006538][ T12] >ffff88800bfa9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 40.006875][ T12] ^
[ 40.007051][ T12] ffff88800bfa9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 40.007304][ T12] ffff88800bfa9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 40.007544][ T12] ==================================================================
[ 40.007920][ T12] Disabling lock debugging due to kernel taint
[ 40.008135][ T12] ------------[ cut here ]------------
[ 40.008304][ T12] refcount_t: underflow; use-after-free.
[ 40.008524][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 40.008928][ T12] Modules linked in: veth nf_tables
[ 40.009127][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 40.009522][ T12] Tainted: [B]=BAD_PAGE
[ 40.009658][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 40.010526][ T12] Workqueue: netns cleanup_net
[ 40.010740][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 40.010963][ 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 a5 b4 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
[ 40.011568][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 40.011790][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 40.012043][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 40.012326][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6a7e220
[ 40.012599][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 40.012889][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 40.013182][ T12] FS: 0000000000000000(0000) GS:ffff88807f9ec000(0000) knlGS:0000000000000000
[ 40.013502][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 40.013731][ T12] CR2: 00007f5e5e77a000 CR3: 000000001b135002 CR4: 0000000000772ef0
[ 40.014080][ T12] PKRU: 55555554
[ 40.014217][ T12] Call Trace:
[ 40.014344][ T12]
[ 40.014434][ T12] netdev_run_todo+0x5f0/0xc60
[ 40.014612][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 40.014786][ T12] ? generic_xdp_install+0x410/0x410
[ 40.014956][ T12] ops_undo_list+0x714/0x890
[ 40.015141][ T12] ? netns_get+0x110/0x110
[ 40.015310][ T12] ? cleanup_net+0x2d6/0x830
[ 40.015480][ T12] cleanup_net+0x3b2/0x830
[ 40.015754][ T12] ? net_passive_dec+0x190/0x190
[ 40.015928][ T12] ? rcu_is_watching+0x12/0xb0
[ 40.016099][ T12] process_one_work+0xe35/0x1650
[ 40.016284][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 40.016540][ T12] ? assign_work+0x168/0x240
[ 40.016715][ T12] worker_thread+0x591/0xcf0
[ 40.016919][ T12] ? rescuer_thread+0xd10/0xd10
[ 40.017093][ T12] kthread+0x37b/0x5f0
[ 40.017230][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 40.017394][ T12] ? ret_from_fork+0x1b/0x270
[ 40.017564][ T12] ? __lock_release+0x5d/0x170
[ 40.017741][ T12] ? rcu_is_watching+0x12/0xb0
[ 40.017911][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 40.018102][ T12] ret_from_fork+0x1db/0x270
[ 40.018296][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 40.018483][ T12] ret_from_fork_asm+0x11/0x20
[ 40.018858][ T12]
[ 40.018989][ T12] irq event stamp: 5025
[ 40.019121][ T12] hardirqs last enabled at (5025): [] finish_task_switch.isra.0+0x245/0x960
[ 40.019462][ T12] hardirqs last disabled at (5024): [] __schedule+0x94a/0x1b10
[ 40.019798][ T12] softirqs last enabled at (4944): [] handle_softirqs+0x352/0x610
[ 40.020099][ T12] softirqs last disabled at (4937): [] irq_exit_rcu+0xab/0x100
[ 40.020499][ T12] ---[ end trace 0000000000000000 ]---
[ 580.828463][ T9907] ip (9907) used greatest stack depth: 24504 bytes left
[ 654.238765][T13670] id (13670) used greatest stack depth: 24488 bytes left