[ 126.419426][ T69] ==================================================================
[ 126.419853][ T69] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 126.420255][ T69] Read of size 1 at addr ffff8880049bc69c by task kworker/u16:1/69
[ 126.420629][ T69]
[ 126.420768][ T69] CPU: 1 UID: 0 PID: 69 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 126.420776][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 126.420782][ T69] Workqueue: netns cleanup_net
[ 126.420793][ T69] Call Trace:
[ 126.420796][ T69]
[ 126.420800][ T69] dump_stack_lvl+0x82/0xc0
[ 126.420809][ T69] print_address_description.constprop.0+0x2c/0x3a0
[ 126.420820][ T69] ? kobject_put+0xbb/0xd0
[ 126.420826][ T69] print_report+0xb4/0x270
[ 126.420832][ T69] ? kobject_put+0xbb/0xd0
[ 126.420837][ T69] ? kasan_addr_to_slab+0x21/0x70
[ 126.420843][ T69] ? kobject_put+0xbb/0xd0
[ 126.420848][ T69] kasan_report+0xca/0x100
[ 126.420855][ T69] ? kobject_put+0xbb/0xd0
[ 126.420864][ T69] kobject_put+0xbb/0xd0
[ 126.420870][ T69] netdev_run_todo+0x5f0/0xc60
[ 126.420879][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 126.420885][ T69] ? generic_xdp_install+0x410/0x410
[ 126.420897][ T69] ops_undo_list+0x714/0x890
[ 126.420906][ T69] ? netns_get+0x110/0x110
[ 126.420911][ T69] ? cleanup_net+0x2d6/0x830
[ 126.420921][ T69] cleanup_net+0x3b2/0x830
[ 126.420928][ T69] ? net_passive_dec+0x190/0x190
[ 126.420936][ T69] ? rcu_is_watching+0x12/0xb0
[ 126.420947][ T69] process_one_work+0xe35/0x1650
[ 126.420961][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 126.420972][ T69] ? assign_work+0x168/0x240
[ 126.420980][ T69] worker_thread+0x591/0xcf0
[ 126.420992][ T69] ? rescuer_thread+0xd10/0xd10
[ 126.420999][ T69] kthread+0x37b/0x5f0
[ 126.421005][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.421010][ T69] ? ret_from_fork+0x1b/0x270
[ 126.421016][ T69] ? __lock_release+0x5d/0x170
[ 126.421023][ T69] ? rcu_is_watching+0x12/0xb0
[ 126.421029][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.421036][ T69] ret_from_fork+0x1db/0x270
[ 126.421040][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.421046][ T69] ret_from_fork_asm+0x11/0x20
[ 126.421062][ T69]
[ 126.421065][ T69]
[ 126.429360][ T69] Allocated by task 240:
[ 126.429499][ T69] kasan_save_stack+0x24/0x40
[ 126.429672][ T69] kasan_save_track+0x14/0x30
[ 126.429833][ T69] __kasan_kmalloc+0x7b/0x90
[ 126.429995][ T69] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 126.430253][ T69] alloc_netdev_mqs+0x7d/0x1370
[ 126.430420][ T69] sit_init_net+0x169/0x550
[ 126.430598][ T69] ops_init+0x189/0x550
[ 126.430744][ T69] setup_net+0xf1/0x380
[ 126.430864][ T69] copy_net_ns+0x21a/0x380
[ 126.431122][ T69] create_new_namespaces+0x35f/0x900
[ 126.431279][ T69] unshare_nsproxy_namespaces+0x89/0x120
[ 126.431441][ T69] ksys_unshare+0x2a3/0x660
[ 126.431612][ T69] __x64_sys_unshare+0x31/0x40
[ 126.431881][ T69] do_syscall_64+0xc1/0xfd0
[ 126.432043][ T69] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 126.432260][ T69]
[ 126.432341][ T69] Freed by task 69:
[ 126.432474][ T69] kasan_save_stack+0x24/0x40
[ 126.432674][ T69] kasan_save_track+0x14/0x30
[ 126.432833][ T69] __kasan_save_free_info+0x3b/0x60
[ 126.432997][ T69] __kasan_slab_free+0x3f/0x60
[ 126.433255][ T69] kfree+0x21d/0x540
[ 126.433384][ T69] device_release+0x9c/0x210
[ 126.433559][ T69] kobject_cleanup+0xfe/0x360
[ 126.433719][ T69] netdev_run_todo+0x81f/0xc60
[ 126.433877][ T69] ops_undo_list+0x714/0x890
[ 126.434128][ T69] cleanup_net+0x3b2/0x830
[ 126.434314][ T69] process_one_work+0xe35/0x1650
[ 126.434489][ T69] worker_thread+0x591/0xcf0
[ 126.434667][ T69] kthread+0x37b/0x5f0
[ 126.434877][ T69] ret_from_fork+0x1db/0x270
[ 126.435043][ T69] ret_from_fork_asm+0x11/0x20
[ 126.435207][ T69]
[ 126.435295][ T69] The buggy address belongs to the object at ffff8880049bc000
[ 126.435295][ T69] which belongs to the cache kmalloc-4k of size 4096
[ 126.435775][ T69] The buggy address is located 1692 bytes inside of
[ 126.435775][ T69] freed 4096-byte region [ffff8880049bc000, ffff8880049bd000)
[ 126.436264][ T69]
[ 126.436346][ T69] The buggy address belongs to the physical page:
[ 126.436565][ T69] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x49b8
[ 126.436855][ T69] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 126.437192][ T69] flags: 0x80000000000040(head|node=0|zone=1)
[ 126.437397][ T69] page_type: f5(slab)
[ 126.437532][ T69] raw: 0080000000000040 ffff888001043700 ffffea00001b9c10 ffffea00003c6c10
[ 126.437925][ T69] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 126.438218][ T69] head: 0080000000000040 ffff888001043700 ffffea00001b9c10 ffffea00003c6c10
[ 126.438557][ T69] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 126.438923][ T69] head: 0080000000000003 ffffea0000126e01 00000000ffffffff 00000000ffffffff
[ 126.439198][ T69] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 126.439588][ T69] page dumped because: kasan: bad access detected
[ 126.439788][ T69]
[ 126.439865][ T69] Memory state around the buggy address:
[ 126.440103][ T69] ffff8880049bc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 126.440337][ T69] ffff8880049bc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 126.440580][ T69] >ffff8880049bc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 126.440903][ T69] ^
[ 126.441061][ T69] ffff8880049bc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 126.441304][ T69] ffff8880049bc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 126.441631][ T69] ==================================================================
[ 126.442030][ T69] Disabling lock debugging due to kernel taint
[ 126.442431][ T69] ------------[ cut here ]------------
[ 126.442773][ T69] refcount_t: underflow; use-after-free.
[ 126.443101][ T69] WARNING: CPU: 2 PID: 69 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 126.443654][ T69] Modules linked in:
[ 126.443900][ T69] CPU: 2 UID: 0 PID: 69 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 126.444595][ T69] Tainted: [B]=BAD_PAGE
[ 126.444852][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 126.445209][ T69] Workqueue: netns cleanup_net
[ 126.445421][ T69] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 126.445681][ T69] Code: 32 b8 02 80 fb 01 0f 87 cb 8b d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 e5 32 b8 02 01 90 48 c7 c7 60 8d 25 bc e8 42 c1 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 126.446382][ T69] RSP: 0018:ffffc900004a7a08 EFLAGS: 00010282
[ 126.446626][ T69] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 126.446904][ T69] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 126.447190][ T69] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7982934
[ 126.447469][ T69] R10: 0000000000000003 R11: ffffc900004a7580 R12: 0000000000000001
[ 126.447731][ T69] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 126.448009][ T69] FS: 0000000000000000(0000) GS:ffff888078284000(0000) knlGS:0000000000000000
[ 126.448321][ T69] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 126.448556][ T69] CR2: 00007f9d70187000 CR3: 000000000b159002 CR4: 0000000000772ef0
[ 126.448824][ T69] PKRU: 55555554
[ 126.448980][ T69] Call Trace:
[ 126.449125][ T69]
[ 126.449238][ T69] netdev_run_todo+0x5f0/0xc60
[ 126.449451][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 126.449636][ T69] ? generic_xdp_install+0x410/0x410
[ 126.449818][ T69] ops_undo_list+0x714/0x890
[ 126.450057][ T69] ? netns_get+0x110/0x110
[ 126.450245][ T69] ? cleanup_net+0x2d6/0x830
[ 126.450430][ T69] cleanup_net+0x3b2/0x830
[ 126.450620][ T69] ? net_passive_dec+0x190/0x190
[ 126.450802][ T69] ? rcu_is_watching+0x12/0xb0
[ 126.451003][ T69] process_one_work+0xe35/0x1650
[ 126.451199][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 126.451375][ T69] ? assign_work+0x168/0x240
[ 126.451572][ T69] worker_thread+0x591/0xcf0
[ 126.451752][ T69] ? rescuer_thread+0xd10/0xd10
[ 126.451937][ T69] kthread+0x37b/0x5f0
[ 126.452078][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.452258][ T69] ? ret_from_fork+0x1b/0x270
[ 126.452453][ T69] ? __lock_release+0x5d/0x170
[ 126.452653][ T69] ? rcu_is_watching+0x12/0xb0
[ 126.452834][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.453022][ T69] ret_from_fork+0x1db/0x270
[ 126.453205][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.453381][ T69] ret_from_fork_asm+0x11/0x20
[ 126.453576][ T69]
[ 126.453716][ T69] irq event stamp: 2699
[ 126.453861][ T69] hardirqs last enabled at (2699): [] finish_task_switch.isra.0+0x245/0x960
[ 126.454216][ T69] hardirqs last disabled at (2698): [] __schedule+0x94a/0x1b10
[ 126.454525][ T69] softirqs last enabled at (1744): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 126.454857][ T69] softirqs last disabled at (1742): [] dev_mc_flush+0x54/0x90
[ 126.455174][ T69] ---[ end trace 0000000000000000 ]---