[ 107.068977][ T12] ==================================================================
[ 107.069245][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 107.069489][ T12] Read of size 1 at addr ffff888007cf46c4 by task kworker/u16:0/12
[ 107.069756][ T12]
[ 107.069841][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 107.069846][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 107.069849][ T12] Workqueue: netns cleanup_net
[ 107.069859][ T12] Call Trace:
[ 107.069861][ T12]
[ 107.069864][ T12] dump_stack_lvl+0x82/0xc0
[ 107.069871][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 107.069879][ T12] ? kobject_put+0xbb/0xd0
[ 107.069883][ T12] print_report+0xb4/0x270
[ 107.069886][ T12] ? kobject_put+0xbb/0xd0
[ 107.069889][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 107.069896][ T12] ? kobject_put+0xbb/0xd0
[ 107.069899][ T12] kasan_report+0xca/0x100
[ 107.069903][ T12] ? kobject_put+0xbb/0xd0
[ 107.069909][ T12] kobject_put+0xbb/0xd0
[ 107.069912][ T12] netdev_run_todo+0x5f0/0xc60
[ 107.069919][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 107.069923][ T12] ? generic_xdp_install+0x410/0x410
[ 107.069926][ T12] ? net_generic+0xb1/0x1f0
[ 107.069935][ T12] ops_undo_list+0x714/0x890
[ 107.069940][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 107.069944][ T12] ? cleanup_net+0x2d6/0x8b0
[ 107.069950][ T12] cleanup_net+0x3b2/0x8b0
[ 107.069954][ T12] ? net_passive_dec+0x190/0x190
[ 107.069958][ T12] ? rcu_is_watching+0x12/0xb0
[ 107.069967][ T12] process_one_work+0xe35/0x1650
[ 107.069977][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 107.069983][ T12] ? assign_work+0x168/0x240
[ 107.069987][ T12] worker_thread+0x591/0xcf0
[ 107.069993][ T12] ? rescuer_thread+0xd10/0xd10
[ 107.069996][ T12] kthread+0x37b/0x5f0
[ 107.070000][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 107.070004][ T12] ? ret_from_fork+0x1b/0x270
[ 107.070009][ T12] ? __lock_release+0x5d/0x170
[ 107.070014][ T12] ? rcu_is_watching+0x12/0xb0
[ 107.070017][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 107.070021][ T12] ret_from_fork+0x1db/0x270
[ 107.070024][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 107.070027][ T12] ret_from_fork_asm+0x11/0x20
[ 107.070038][ T12]
[ 107.070039][ T12]
[ 107.076108][ T12] Allocated by task 269:
[ 107.076227][ T12] kasan_save_stack+0x24/0x40
[ 107.076387][ T12] kasan_save_track+0x14/0x30
[ 107.076537][ T12] __kasan_kmalloc+0x7b/0x90
[ 107.076708][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 107.076869][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 107.077028][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 107.077189][ T12] ops_init+0x189/0x550
[ 107.077310][ T12] setup_net+0xf1/0x380
[ 107.077427][ T12] copy_net_ns+0x253/0x510
[ 107.077586][ T12] create_new_namespaces+0x35f/0x900
[ 107.077756][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 107.077917][ T12] ksys_unshare+0x2be/0x6e0
[ 107.078075][ T12] __x64_sys_unshare+0x31/0x40
[ 107.078231][ T12] do_syscall_64+0xc1/0xfd0
[ 107.078390][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 107.078581][ T12]
[ 107.078666][ T12] Freed by task 12:
[ 107.078797][ T12] kasan_save_stack+0x24/0x40
[ 107.078953][ T12] kasan_save_track+0x14/0x30
[ 107.079109][ T12] __kasan_save_free_info+0x3b/0x60
[ 107.079263][ T12] __kasan_slab_free+0x3f/0x60
[ 107.079412][ T12] kfree+0x21d/0x540
[ 107.079527][ T12] device_release+0x9c/0x210
[ 107.079701][ T12] kobject_cleanup+0xfe/0x360
[ 107.079861][ T12] netdev_run_todo+0x81f/0xc60
[ 107.080017][ T12] ops_undo_list+0x714/0x890
[ 107.080170][ T12] cleanup_net+0x3b2/0x8b0
[ 107.080320][ T12] process_one_work+0xe35/0x1650
[ 107.080477][ T12] worker_thread+0x591/0xcf0
[ 107.080628][ T12] kthread+0x37b/0x5f0
[ 107.080750][ T12] ret_from_fork+0x1db/0x270
[ 107.080916][ T12] ret_from_fork_asm+0x11/0x20
[ 107.081071][ T12]
[ 107.081146][ T12] The buggy address belongs to the object at ffff888007cf4000
[ 107.081146][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 107.081508][ T12] The buggy address is located 1732 bytes inside of
[ 107.081508][ T12] freed 4096-byte region [ffff888007cf4000, ffff888007cf5000)
[ 107.081892][ T12]
[ 107.081971][ T12] The buggy address belongs to the physical page:
[ 107.082154][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7cf0
[ 107.082428][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 107.082666][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 107.082882][ T12] page_type: f5(slab)
[ 107.083008][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000152210 ffffea0000232c10
[ 107.083284][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 107.083551][ T12] head: 0080000000000040 ffff888001043700 ffffea0000152210 ffffea0000232c10
[ 107.083834][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 107.084107][ T12] head: 0080000000000003 ffffea00001f3c01 00000000ffffffff 00000000ffffffff
[ 107.084375][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 107.084647][ T12] page dumped because: kasan: bad access detected
[ 107.084844][ T12]
[ 107.084926][ T12] Memory state around the buggy address:
[ 107.085074][ T12] ffff888007cf4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 107.085300][ T12] ffff888007cf4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 107.085601][ T12] >ffff888007cf4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 107.085834][ T12] ^
[ 107.086016][ T12] ffff888007cf4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 107.086237][ T12] ffff888007cf4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 107.086452][ T12] ==================================================================
[ 107.087225][ T12] Disabling lock debugging due to kernel taint
[ 107.088590][ T12] ------------[ cut here ]------------
[ 107.088778][ T12] refcount_t: underflow; use-after-free.
[ 107.089118][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 107.089411][ T12] Modules linked in:
[ 107.089553][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 107.089931][ T12] Tainted: [B]=BAD_PAGE
[ 107.090067][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 107.090274][ T12] Workqueue: netns cleanup_net
[ 107.090462][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 107.090704][ 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 25 96 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
[ 107.091283][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 107.091505][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 107.091764][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 107.092023][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2e40934
[ 107.092275][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 107.092527][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 107.092790][ T12] FS: 0000000000000000(0000) GS:ffff8880d4a08000(0000) knlGS:0000000000000000
[ 107.093081][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 107.093298][ T12] CR2: 00007fa5382b14d0 CR3: 0000000034349004 CR4: 0000000000772ef0
[ 107.093547][ T12] PKRU: 55555554
[ 107.093691][ T12] Call Trace:
[ 107.093833][ T12]
[ 107.093942][ T12] netdev_run_todo+0x5f0/0xc60
[ 107.094117][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 107.094293][ T12] ? generic_xdp_install+0x410/0x410
[ 107.094462][ T12] ? net_generic+0xb1/0x1f0
[ 107.094648][ T12] ops_undo_list+0x714/0x890
[ 107.094842][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 107.095089][ T12] ? cleanup_net+0x2d6/0x8b0
[ 107.095327][ T12] cleanup_net+0x3b2/0x8b0
[ 107.095553][ T12] ? net_passive_dec+0x190/0x190
[ 107.095801][ T12] ? rcu_is_watching+0x12/0xb0
[ 107.096037][ T12] process_one_work+0xe35/0x1650
[ 107.096270][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 107.096497][ T12] ? assign_work+0x168/0x240
[ 107.096731][ T12] worker_thread+0x591/0xcf0
[ 107.096976][ T12] ? rescuer_thread+0xd10/0xd10
[ 107.097222][ T12] kthread+0x37b/0x5f0
[ 107.097426][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 107.097647][ T12] ? ret_from_fork+0x1b/0x270
[ 107.097886][ T12] ? __lock_release+0x5d/0x170
[ 107.098171][ T12] ? rcu_is_watching+0x12/0xb0
[ 107.098402][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 107.098624][ T12] ret_from_fork+0x1db/0x270
[ 107.098856][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 107.099096][ T12] ret_from_fork_asm+0x11/0x20
[ 107.099330][ T12]
[ 107.099521][ T12] irq event stamp: 41885
[ 107.099732][ T12] hardirqs last enabled at (41885): [] irqentry_exit+0x3b/0x80
[ 107.100099][ T12] hardirqs last disabled at (41884): [] handle_softirqs+0x47f/0x610
[ 107.100436][ T12] softirqs last enabled at (40714): [] handle_softirqs+0x352/0x610
[ 107.100781][ T12] softirqs last disabled at (40703): [] irq_exit_rcu+0xab/0x100
[ 107.101116][ T12] ---[ end trace 0000000000000000 ]---