[ 15.883936][ T256] ip (256) used greatest stack depth: 24256 bytes left
[ 26.424012][ T12] ==================================================================
[ 26.424280][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 26.424548][ T12] Read of size 1 at addr ffff8880094b16c4 by task kworker/u16:0/12
[ 26.424799][ T12]
[ 26.424881][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 26.424885][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 26.424889][ T12] Workqueue: netns cleanup_net
[ 26.424896][ T12] Call Trace:
[ 26.424898][ T12]
[ 26.424900][ T12] dump_stack_lvl+0x82/0xc0
[ 26.424905][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 26.424912][ T12] ? kobject_put+0xbb/0xd0
[ 26.424916][ T12] print_report+0xb4/0x270
[ 26.424919][ T12] ? kobject_put+0xbb/0xd0
[ 26.424922][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 26.424926][ T12] ? kobject_put+0xbb/0xd0
[ 26.424929][ T12] kasan_report+0xca/0x100
[ 26.424933][ T12] ? kobject_put+0xbb/0xd0
[ 26.424938][ T12] kobject_put+0xbb/0xd0
[ 26.424941][ T12] netdev_run_todo+0x5f0/0xc60
[ 26.424947][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 26.424951][ T12] ? generic_xdp_install+0x410/0x410
[ 26.424954][ T12] ? net_generic+0xb1/0x1f0
[ 26.424962][ T12] ops_undo_list+0x714/0x890
[ 26.424968][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 26.424971][ T12] ? cleanup_net+0x2d6/0x8b0
[ 26.424977][ T12] cleanup_net+0x3b2/0x8b0
[ 26.424981][ T12] ? net_passive_dec+0x190/0x190
[ 26.424986][ T12] ? rcu_is_watching+0x12/0xb0
[ 26.424994][ T12] process_one_work+0xe35/0x1650
[ 26.425002][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 26.425008][ T12] ? assign_work+0x168/0x240
[ 26.425012][ T12] worker_thread+0x591/0xcf0
[ 26.425018][ T12] ? rescuer_thread+0xd10/0xd10
[ 26.425021][ T12] kthread+0x37b/0x5f0
[ 26.425025][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 26.425028][ T12] ? ret_from_fork+0x1b/0x270
[ 26.425032][ T12] ? __lock_release+0x5d/0x170
[ 26.425036][ T12] ? rcu_is_watching+0x12/0xb0
[ 26.425040][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 26.425044][ T12] ret_from_fork+0x1db/0x270
[ 26.425046][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 26.425049][ T12] ret_from_fork_asm+0x11/0x20
[ 26.425058][ T12]
[ 26.425059][ T12]
[ 26.431253][ T12] Allocated by task 255:
[ 26.431403][ T12] kasan_save_stack+0x24/0x40
[ 26.431571][ T12] kasan_save_track+0x14/0x30
[ 26.431735][ T12] __kasan_kmalloc+0x7b/0x90
[ 26.431902][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 26.432062][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 26.432220][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 26.432377][ T12] ops_init+0x189/0x550
[ 26.432528][ T12] setup_net+0xf1/0x380
[ 26.432663][ T12] copy_net_ns+0x253/0x510
[ 26.432823][ T12] create_new_namespaces+0x35f/0x900
[ 26.432990][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 26.433154][ T12] ksys_unshare+0x2be/0x6e0
[ 26.433310][ T12] __x64_sys_unshare+0x31/0x40
[ 26.433473][ T12] do_syscall_64+0xc1/0xfd0
[ 26.433649][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 26.433847][ T12]
[ 26.433927][ T12] Freed by task 12:
[ 26.434046][ T12] kasan_save_stack+0x24/0x40
[ 26.434205][ T12] kasan_save_track+0x14/0x30
[ 26.434363][ T12] __kasan_save_free_info+0x3b/0x60
[ 26.434533][ T12] __kasan_slab_free+0x3f/0x60
[ 26.434699][ T12] kfree+0x21d/0x540
[ 26.434819][ T12] device_release+0x9c/0x210
[ 26.434977][ T12] kobject_cleanup+0xfe/0x360
[ 26.435137][ T12] netdev_run_todo+0x81f/0xc60
[ 26.435294][ T12] ops_undo_list+0x714/0x890
[ 26.435457][ T12] cleanup_net+0x3b2/0x8b0
[ 26.435621][ T12] process_one_work+0xe35/0x1650
[ 26.435785][ T12] worker_thread+0x591/0xcf0
[ 26.435973][ T12] kthread+0x37b/0x5f0
[ 26.436093][ T12] ret_from_fork+0x1db/0x270
[ 26.436251][ T12] ret_from_fork_asm+0x11/0x20
[ 26.436410][ T12]
[ 26.436511][ T12] The buggy address belongs to the object at ffff8880094b1000
[ 26.436511][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 26.436940][ T12] The buggy address is located 1732 bytes inside of
[ 26.436940][ T12] freed 4096-byte region [ffff8880094b1000, ffff8880094b2000)
[ 26.437332][ T12]
[ 26.437415][ T12] The buggy address belongs to the physical page:
[ 26.437620][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x94b0
[ 26.437938][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 26.438196][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 26.438420][ T12] page_type: f5(slab)
[ 26.438545][ T12] raw: 0080000000000040 ffff888001043700 ffffea000021b210 ffffea00002ba010
[ 26.438846][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 26.439164][ T12] head: 0080000000000040 ffff888001043700 ffffea000021b210 ffffea00002ba010
[ 26.439451][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 26.439732][ T12] head: 0080000000000003 ffffea0000252c01 00000000ffffffff 00000000ffffffff
[ 26.440020][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 26.440317][ T12] page dumped because: kasan: bad access detected
[ 26.440526][ T12]
[ 26.440604][ T12] Memory state around the buggy address:
[ 26.440786][ T12] ffff8880094b1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 26.441048][ T12] ffff8880094b1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 26.441285][ T12] >ffff8880094b1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 26.441542][ T12] ^
[ 26.441741][ T12] ffff8880094b1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 26.441973][ T12] ffff8880094b1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 26.442224][ T12] ==================================================================
[ 26.442631][ T12] Disabling lock debugging due to kernel taint
[ 26.444273][ T12] ------------[ cut here ]------------
[ 26.444451][ T12] refcount_t: underflow; use-after-free.
[ 26.444632][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 26.444934][ T12] Modules linked in:
[ 26.445060][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 26.445430][ T12] Tainted: [B]=BAD_PAGE
[ 26.445558][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 26.445770][ T12] Workqueue: netns cleanup_net
[ 26.445941][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 26.446143][ 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 ae 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
[ 26.446750][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 26.446962][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 26.447199][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 26.447512][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5e40934
[ 26.447784][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 26.448061][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 26.448327][ T12] FS: 0000000000000000(0000) GS:ffff8880bca88000(0000) knlGS:0000000000000000
[ 26.448632][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 26.448842][ T12] CR2: 000055c688a7b0d8 CR3: 0000000055d49005 CR4: 0000000000772ef0
[ 26.449093][ T12] PKRU: 55555554
[ 26.449220][ T12] Call Trace:
[ 26.449346][ T12]
[ 26.449437][ T12] netdev_run_todo+0x5f0/0xc60
[ 26.449605][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 26.449778][ T12] ? generic_xdp_install+0x410/0x410
[ 26.449941][ T12] ? net_generic+0xb1/0x1f0
[ 26.450101][ T12] ops_undo_list+0x714/0x890
[ 26.450268][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 26.450437][ T12] ? cleanup_net+0x2d6/0x8b0
[ 26.450603][ T12] cleanup_net+0x3b2/0x8b0
[ 26.450772][ T12] ? net_passive_dec+0x190/0x190
[ 26.450937][ T12] ? rcu_is_watching+0x12/0xb0
[ 26.451092][ T12] process_one_work+0xe35/0x1650
[ 26.451260][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 26.451429][ T12] ? assign_work+0x168/0x240
[ 26.451596][ T12] worker_thread+0x591/0xcf0
[ 26.451767][ T12] ? rescuer_thread+0xd10/0xd10
[ 26.451935][ T12] kthread+0x37b/0x5f0
[ 26.452052][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 26.452215][ T12] ? ret_from_fork+0x1b/0x270
[ 26.452382][ T12] ? __lock_release+0x5d/0x170
[ 26.452554][ T12] ? rcu_is_watching+0x12/0xb0
[ 26.452726][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 26.452890][ T12] ret_from_fork+0x1db/0x270
[ 26.453049][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 26.453206][ T12] ret_from_fork_asm+0x11/0x20
[ 26.453382][ T12]
[ 26.453525][ T12] irq event stamp: 20497
[ 26.453647][ T12] hardirqs last enabled at (20497): [] finish_task_switch.isra.0+0x245/0x960
[ 26.453974][ T12] hardirqs last disabled at (20496): [] __schedule+0x94a/0x1b10
[ 26.454258][ T12] softirqs last enabled at (19920): [] handle_softirqs+0x352/0x610
[ 26.454552][ T12] softirqs last disabled at (19003): [] irq_exit_rcu+0xab/0x100
[ 26.454831][ T12] ---[ end trace 0000000000000000 ]---