[ 15.007571][ T71] ==================================================================
[ 15.008101][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 15.008512][ T71] Read of size 1 at addr ffff8880053c1694 by task kworker/u16:1/71
[ 15.008900][ T71]
[ 15.009036][ T71] CPU: 1 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.009045][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.009050][ T71] Workqueue: netns cleanup_net
[ 15.009062][ T71] Call Trace:
[ 15.009065][ T71]
[ 15.009070][ T71] dump_stack_lvl+0x82/0xc0
[ 15.009080][ T71] print_address_description.constprop.0+0x2c/0x3a0
[ 15.009092][ T71] ? kobject_put+0xbb/0xd0
[ 15.009098][ T71] print_report+0xb4/0x270
[ 15.009104][ T71] ? kobject_put+0xbb/0xd0
[ 15.009108][ T71] ? kasan_addr_to_slab+0x21/0x70
[ 15.009115][ T71] ? kobject_put+0xbb/0xd0
[ 15.009120][ T71] kasan_report+0xca/0x100
[ 15.009127][ T71] ? kobject_put+0xbb/0xd0
[ 15.009136][ T71] kobject_put+0xbb/0xd0
[ 15.009141][ T71] netdev_run_todo+0x5f0/0xc60
[ 15.009150][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 15.009156][ T71] ? generic_xdp_install+0x410/0x410
[ 15.009169][ T71] ops_undo_list+0x714/0x890
[ 15.009177][ T71] ? netns_get+0x110/0x110
[ 15.009180][ T71] ? cleanup_net+0x2d6/0x830
[ 15.009190][ T71] cleanup_net+0x3b2/0x830
[ 15.009196][ T71] ? net_passive_dec+0x190/0x190
[ 15.009203][ T71] ? rcu_is_watching+0x12/0xb0
[ 15.009212][ T71] process_one_work+0xe35/0x1650
[ 15.009226][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.009235][ T71] ? assign_work+0x168/0x240
[ 15.009242][ T71] worker_thread+0x591/0xcf0
[ 15.009252][ T71] ? rescuer_thread+0xd10/0xd10
[ 15.009259][ T71] kthread+0x37b/0x5f0
[ 15.009265][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.009269][ T71] ? ret_from_fork+0x1b/0x270
[ 15.009277][ T71] ? __lock_release+0x5d/0x170
[ 15.009286][ T71] ? rcu_is_watching+0x12/0xb0
[ 15.009292][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.009297][ T71] ret_from_fork+0x1db/0x270
[ 15.009302][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.009306][ T71] ret_from_fork_asm+0x11/0x20
[ 15.009318][ T71]
[ 15.009320][ T71]
[ 15.019669][ T71] Allocated by task 228:
[ 15.019901][ T71] kasan_save_stack+0x24/0x40
[ 15.020192][ T71] kasan_save_track+0x14/0x30
[ 15.020457][ T71] __kasan_kmalloc+0x7b/0x90
[ 15.020721][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 15.020992][ T71] alloc_netdev_mqs+0x7d/0x1310
[ 15.021250][ T71] sit_init_net+0x169/0x550
[ 15.021527][ T71] ops_init+0x189/0x550
[ 15.021739][ T71] setup_net+0xf1/0x380
[ 15.021950][ T71] copy_net_ns+0x21a/0x380
[ 15.022220][ T71] create_new_namespaces+0x35f/0x900
[ 15.022494][ T71] unshare_nsproxy_namespaces+0x89/0x120
[ 15.022767][ T71] ksys_unshare+0x2a3/0x660
[ 15.023036][ T71] __x64_sys_unshare+0x31/0x40
[ 15.023299][ T71] do_syscall_64+0xc1/0xfd0
[ 15.023570][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.023901][ T71]
[ 15.024034][ T71] Freed by task 71:
[ 15.024230][ T71] kasan_save_stack+0x24/0x40
[ 15.024506][ T71] kasan_save_track+0x14/0x30
[ 15.024762][ T71] __kasan_save_free_info+0x3b/0x60
[ 15.025041][ T71] __kasan_slab_free+0x3f/0x60
[ 15.025303][ T71] kfree+0x21d/0x540
[ 15.025512][ T71] device_release+0x9c/0x210
[ 15.025799][ T71] kobject_cleanup+0xfe/0x360
[ 15.026073][ T71] netdev_run_todo+0x81f/0xc60
[ 15.026352][ T71] ops_undo_list+0x714/0x890
[ 15.026650][ T71] cleanup_net+0x3b2/0x830
[ 15.026925][ T71] process_one_work+0xe35/0x1650
[ 15.027195][ T71] worker_thread+0x591/0xcf0
[ 15.027469][ T71] kthread+0x37b/0x5f0
[ 15.027677][ T71] ret_from_fork+0x1db/0x270
[ 15.027977][ T71] ret_from_fork_asm+0x11/0x20
[ 15.028243][ T71]
[ 15.028386][ T71] The buggy address belongs to the object at ffff8880053c1000
[ 15.028386][ T71] which belongs to the cache kmalloc-4k of size 4096
[ 15.029042][ T71] The buggy address is located 1684 bytes inside of
[ 15.029042][ T71] freed 4096-byte region [ffff8880053c1000, ffff8880053c2000)
[ 15.029696][ T71]
[ 15.029858][ T71] The buggy address belongs to the physical page:
[ 15.030209][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x53c0
[ 15.030704][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 15.031145][ T71] flags: 0x80000000000040(head|node=0|zone=1)
[ 15.031502][ T71] page_type: f5(slab)
[ 15.031722][ T71] raw: 0080000000000040 ffff888001043700 ffffea000012ac10 ffffea0000208a10
[ 15.032222][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.032727][ T71] head: 0080000000000040 ffff888001043700 ffffea000012ac10 ffffea0000208a10
[ 15.033222][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.033707][ T71] head: 0080000000000003 ffffea000014f001 00000000ffffffff 00000000ffffffff
[ 15.034191][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 15.034660][ T71] page dumped because: kasan: bad access detected
[ 15.034998][ T71]
[ 15.035138][ T71] Memory state around the buggy address:
[ 15.035384][ T71] ffff8880053c1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.035773][ T71] ffff8880053c1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.036148][ T71] >ffff8880053c1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.036553][ T71] ^
[ 15.036835][ T71] ffff8880053c1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.037245][ T71] ffff8880053c1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.037647][ T71] ==================================================================
[ 15.038305][ T71] Disabling lock debugging due to kernel taint
[ 15.038650][ T71] ------------[ cut here ]------------
[ 15.038903][ T71] refcount_t: underflow; use-after-free.
[ 15.039200][ T71] WARNING: CPU: 1 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.040448][ T71] Modules linked in: veth
[ 15.040701][ T71] CPU: 1 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.041335][ T71] Tainted: [B]=BAD_PAGE
[ 15.041531][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.041861][ T71] Workqueue: netns cleanup_net
[ 15.042148][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.042516][ T71] 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 85 af 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
[ 15.043524][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282
[ 15.043866][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.044300][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.044708][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff603e134
[ 15.045113][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001
[ 15.045528][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.045943][ T71] FS: 0000000000000000(0000) GS:ffff88807f090000(0000) knlGS:0000000000000000
[ 15.046420][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.046767][ T71] CR2: 0000555e8f7ec9f8 CR3: 00000000071c6002 CR4: 0000000000772ef0
[ 15.047170][ T71] PKRU: 55555554
[ 15.047380][ T71] Call Trace:
[ 15.047587][ T71]
[ 15.047732][ T71] netdev_run_todo+0x5f0/0xc60
[ 15.048028][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 15.048310][ T71] ? generic_xdp_install+0x410/0x410
[ 15.048585][ T71] ops_undo_list+0x714/0x890
[ 15.048869][ T71] ? netns_get+0x110/0x110
[ 15.049122][ T71] ? cleanup_net+0x2d6/0x830
[ 15.049403][ T71] cleanup_net+0x3b2/0x830
[ 15.049658][ T71] ? net_passive_dec+0x190/0x190
[ 15.049929][ T71] ? rcu_is_watching+0x12/0xb0
[ 15.050198][ T71] process_one_work+0xe35/0x1650
[ 15.050487][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.050762][ T71] ? assign_work+0x168/0x240
[ 15.051036][ T71] worker_thread+0x591/0xcf0
[ 15.051306][ T71] ? rescuer_thread+0xd10/0xd10
[ 15.051587][ T71] kthread+0x37b/0x5f0
[ 15.051793][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.052052][ T71] ? ret_from_fork+0x1b/0x270
[ 15.052329][ T71] ? __lock_release+0x5d/0x170
[ 15.052599][ T71] ? rcu_is_watching+0x12/0xb0
[ 15.052871][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.053147][ T71] ret_from_fork+0x1db/0x270
[ 15.053463][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.053723][ T71] ret_from_fork_asm+0x11/0x20
[ 15.053994][ T71]
[ 15.054208][ T71] irq event stamp: 2793
[ 15.054418][ T71] hardirqs last enabled at (2793): [] finish_task_switch.isra.0+0x245/0x960
[ 15.054954][ T71] hardirqs last disabled at (2792): [] __schedule+0x94a/0x1b10
[ 15.055432][ T71] softirqs last enabled at (2706): [] handle_softirqs+0x352/0x610
[ 15.055900][ T71] softirqs last disabled at (2641): [] irq_exit_rcu+0xab/0x100
[ 15.056358][ T71] ---[ end trace 0000000000000000 ]---