[ 16.915399][ T259] ip (259) used greatest stack depth: 24688 bytes left
[ 19.308339][ T12] ==================================================================
[ 19.308885][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 19.309309][ T12] Read of size 1 at addr ffff888004f546c4 by task kworker/u16:0/12
[ 19.309686][ T12]
[ 19.309828][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.309837][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.309841][ T12] Workqueue: netns cleanup_net
[ 19.309855][ T12] Call Trace:
[ 19.309859][ T12]
[ 19.309862][ T12] dump_stack_lvl+0x82/0xc0
[ 19.309871][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 19.309882][ T12] ? kobject_put+0xbb/0xd0
[ 19.309889][ T12] print_report+0xb4/0x270
[ 19.309894][ T12] ? kobject_put+0xbb/0xd0
[ 19.309899][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 19.309906][ T12] ? kobject_put+0xbb/0xd0
[ 19.309910][ T12] kasan_report+0xca/0x100
[ 19.309917][ T12] ? kobject_put+0xbb/0xd0
[ 19.309927][ T12] kobject_put+0xbb/0xd0
[ 19.309933][ T12] netdev_run_todo+0x5f0/0xc60
[ 19.309943][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 19.309949][ T12] ? generic_xdp_install+0x410/0x410
[ 19.309954][ T12] ? net_generic+0xb1/0x1f0
[ 19.309969][ T12] ops_undo_list+0x714/0x890
[ 19.309978][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 19.309984][ T12] ? cleanup_net+0x2d6/0x8b0
[ 19.309994][ T12] cleanup_net+0x3b2/0x8b0
[ 19.310002][ T12] ? net_passive_dec+0x190/0x190
[ 19.310010][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.310023][ T12] process_one_work+0xe35/0x1650
[ 19.310039][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 19.310050][ T12] ? assign_work+0x168/0x240
[ 19.310057][ T12] worker_thread+0x591/0xcf0
[ 19.310068][ T12] ? rescuer_thread+0xd10/0xd10
[ 19.310075][ T12] kthread+0x37b/0x5f0
[ 19.310081][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.310086][ T12] ? ret_from_fork+0x1b/0x270
[ 19.310093][ T12] ? __lock_release+0x5d/0x170
[ 19.310099][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.310105][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.310112][ T12] ret_from_fork+0x1db/0x270
[ 19.310116][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.310121][ T12] ret_from_fork_asm+0x11/0x20
[ 19.310139][ T12]
[ 19.310141][ T12]
[ 19.320590][ T12] Allocated by task 275:
[ 19.320803][ T12] kasan_save_stack+0x24/0x40
[ 19.321096][ T12] kasan_save_track+0x14/0x30
[ 19.321376][ T12] __kasan_kmalloc+0x7b/0x90
[ 19.321644][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 19.321909][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 19.322184][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 19.322470][ T12] ops_init+0x189/0x550
[ 19.322673][ T12] setup_net+0xf1/0x380
[ 19.322880][ T12] copy_net_ns+0x253/0x510
[ 19.323146][ T12] create_new_namespaces+0x35f/0x900
[ 19.323422][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 19.323690][ T12] ksys_unshare+0x2be/0x6e0
[ 19.323965][ T12] __x64_sys_unshare+0x31/0x40
[ 19.324246][ T12] do_syscall_64+0xc1/0xfd0
[ 19.324521][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 19.324859][ T12]
[ 19.324996][ T12] Freed by task 12:
[ 19.325199][ T12] kasan_save_stack+0x24/0x40
[ 19.325474][ T12] kasan_save_track+0x14/0x30
[ 19.325740][ T12] __kasan_save_free_info+0x3b/0x60
[ 19.326012][ T12] __kasan_slab_free+0x3f/0x60
[ 19.326290][ T12] kfree+0x21d/0x540
[ 19.326494][ T12] device_release+0x9c/0x210
[ 19.326754][ T12] kobject_cleanup+0xfe/0x360
[ 19.327027][ T12] netdev_run_todo+0x81f/0xc60
[ 19.327298][ T12] ops_undo_list+0x714/0x890
[ 19.327570][ T12] cleanup_net+0x3b2/0x8b0
[ 19.327850][ T12] process_one_work+0xe35/0x1650
[ 19.328120][ T12] worker_thread+0x591/0xcf0
[ 19.328397][ T12] kthread+0x37b/0x5f0
[ 19.328608][ T12] ret_from_fork+0x1db/0x270
[ 19.328877][ T12] ret_from_fork_asm+0x11/0x20
[ 19.329149][ T12]
[ 19.329285][ T12] The buggy address belongs to the object at ffff888004f54000
[ 19.329285][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 19.329921][ T12] The buggy address is located 1732 bytes inside of
[ 19.329921][ T12] freed 4096-byte region [ffff888004f54000, ffff888004f55000)
[ 19.330569][ T12]
[ 19.330707][ T12] The buggy address belongs to the physical page:
[ 19.331031][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4f50
[ 19.331511][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 19.331914][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 19.332272][ T12] page_type: f5(slab)
[ 19.332491][ T12] raw: 0080000000000040 ffff888001043700 ffffea000053d210 ffffea000013d610
[ 19.332977][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 19.333458][ T12] head: 0080000000000040 ffff888001043700 ffffea000053d210 ffffea000013d610
[ 19.333948][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 19.334445][ T12] head: 0080000000000003 ffffea000013d401 00000000ffffffff 00000000ffffffff
[ 19.334916][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 19.335391][ T12] page dumped because: kasan: bad access detected
[ 19.335723][ T12]
[ 19.335858][ T12] Memory state around the buggy address:
[ 19.336128][ T12] ffff888004f54580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.336521][ T12] ffff888004f54600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.336898][ T12] >ffff888004f54680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.337292][ T12] ^
[ 19.337772][ T12] ffff888004f54700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.338172][ T12] ffff888004f54780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.338555][ T12] ==================================================================
[ 19.339268][ T12] Disabling lock debugging due to kernel taint
[ 19.339535][ T12] ------------[ cut here ]------------
[ 19.339722][ T12] refcount_t: underflow; use-after-free.
[ 19.339983][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 19.340511][ T12] Modules linked in:
[ 19.340654][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.341081][ T12] Tainted: [B]=BAD_PAGE
[ 19.341234][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.341484][ T12] Workqueue: netns cleanup_net
[ 19.341717][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 19.341981][ 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 05 8a 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
[ 19.342712][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 19.342988][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 19.343276][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 19.343535][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1600934
[ 19.343813][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 19.344104][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 19.344488][ T12] FS: 0000000000000000(0000) GS:ffff8880e0b88000(0000) knlGS:0000000000000000
[ 19.344799][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 19.345144][ T12] CR2: 0000561f146efdec CR3: 0000000015456001 CR4: 0000000000772ef0
[ 19.345411][ T12] PKRU: 55555554
[ 19.345537][ T12] Call Trace:
[ 19.345672][ T12]
[ 19.345772][ T12] netdev_run_todo+0x5f0/0xc60
[ 19.346082][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 19.346265][ T12] ? generic_xdp_install+0x410/0x410
[ 19.346443][ T12] ? net_generic+0xb1/0x1f0
[ 19.346630][ T12] ops_undo_list+0x714/0x890
[ 19.346934][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 19.347166][ T12] ? cleanup_net+0x2d6/0x8b0
[ 19.347365][ T12] cleanup_net+0x3b2/0x8b0
[ 19.347564][ T12] ? net_passive_dec+0x190/0x190
[ 19.347884][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.348091][ T12] process_one_work+0xe35/0x1650
[ 19.348314][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 19.348528][ T12] ? assign_work+0x168/0x240
[ 19.348833][ T12] worker_thread+0x591/0xcf0
[ 19.349000][ T12] ? rescuer_thread+0xd10/0xd10
[ 19.349189][ T12] kthread+0x37b/0x5f0
[ 19.349334][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.349619][ T12] ? ret_from_fork+0x1b/0x270
[ 19.349799][ T12] ? __lock_release+0x5d/0x170
[ 19.349990][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.350177][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.350455][ T12] ret_from_fork+0x1db/0x270
[ 19.350638][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.350811][ T12] ret_from_fork_asm+0x11/0x20
[ 19.350997][ T12]
[ 19.351231][ T12] irq event stamp: 12601
[ 19.351367][ T12] hardirqs last enabled at (12601): [] finish_task_switch.isra.0+0x245/0x960
[ 19.351752][ T12] hardirqs last disabled at (12600): [] __schedule+0x94a/0x1b10
[ 19.352187][ T12] softirqs last enabled at (12434): [] handle_softirqs+0x352/0x610
[ 19.352504][ T12] softirqs last disabled at (12423): [] irq_exit_rcu+0xab/0x100
[ 19.352974][ T12] ---[ end trace 0000000000000000 ]---