[ 17.620423][ T71] ================================================================== [ 17.620779][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0 [ 17.621073][ T71] Read of size 1 at addr ffff888008cfc6c4 by task kworker/u16:1/71 [ 17.621365][ T71] [ 17.621469][ T71] CPU: 0 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full) [ 17.621475][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.621478][ T71] Workqueue: netns cleanup_net [ 17.621487][ T71] Call Trace: [ 17.621489][ T71] [ 17.621492][ T71] dump_stack_lvl+0x82/0xc0 [ 17.621499][ T71] print_address_description.constprop.0+0x2c/0x3a0 [ 17.621507][ T71] ? kobject_put+0xbb/0xd0 [ 17.621511][ T71] print_report+0xb4/0x270 [ 17.621514][ T71] ? kobject_put+0xbb/0xd0 [ 17.621517][ T71] ? kasan_addr_to_slab+0x21/0x70 [ 17.621521][ T71] ? kobject_put+0xbb/0xd0 [ 17.621524][ T71] kasan_report+0xca/0x100 [ 17.621528][ T71] ? kobject_put+0xbb/0xd0 [ 17.621534][ T71] kobject_put+0xbb/0xd0 [ 17.621537][ T71] netdev_run_todo+0x5f0/0xc60 [ 17.621543][ T71] ? dev_ingress_queue_create+0x190/0x190 [ 17.621547][ T71] ? generic_xdp_install+0x410/0x410 [ 17.621550][ T71] ? net_generic+0xb1/0x1f0 [ 17.621560][ T71] ops_undo_list+0x714/0x890 [ 17.621565][ T71] ? rtnl_net_dumpid_one+0x270/0x270 [ 17.621568][ T71] ? cleanup_net+0x2d6/0x8b0 [ 17.621574][ T71] cleanup_net+0x3b2/0x8b0 [ 17.621579][ T71] ? net_passive_dec+0x190/0x190 [ 17.621583][ T71] ? rcu_is_watching+0x12/0xb0 [ 17.621592][ T71] process_one_work+0xe35/0x1650 [ 17.621601][ T71] ? pwq_dec_nr_in_flight+0x550/0x550 [ 17.621607][ T71] ? assign_work+0x168/0x240 [ 17.621612][ T71] worker_thread+0x591/0xcf0 [ 17.621617][ T71] ? rescuer_thread+0xd10/0xd10 [ 17.621622][ T71] kthread+0x37b/0x5f0 [ 17.621628][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.621632][ T71] ? ret_from_fork+0x1b/0x270 [ 17.621638][ T71] ? __lock_release+0x5d/0x170 [ 17.621646][ T71] ? rcu_is_watching+0x12/0xb0 [ 17.621652][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.621659][ T71] ret_from_fork+0x1db/0x270 [ 17.621665][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.621670][ T71] ret_from_fork_asm+0x11/0x20 [ 17.621681][ T71] [ 17.621683][ T71] [ 17.629202][ T71] Allocated by task 269: [ 17.629356][ T71] kasan_save_stack+0x24/0x40 [ 17.629560][ T71] kasan_save_track+0x14/0x30 [ 17.629840][ T71] __kasan_kmalloc+0x7b/0x90 [ 17.630042][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0 [ 17.630257][ T71] alloc_netdev_mqs+0x7d/0x1370 [ 17.630455][ T71] ip6_tnl_init_net+0x102/0x3f0 [ 17.630741][ T71] ops_init+0x189/0x550 [ 17.630880][ T71] setup_net+0xf1/0x380 [ 17.631025][ T71] copy_net_ns+0x253/0x510 [ 17.631237][ T71] create_new_namespaces+0x35f/0x900 [ 17.631431][ T71] unshare_nsproxy_namespaces+0x8a/0x1a0 [ 17.631714][ T71] ksys_unshare+0x2be/0x6e0 [ 17.631895][ T71] __x64_sys_unshare+0x31/0x40 [ 17.632089][ T71] do_syscall_64+0xc1/0xfd0 [ 17.632283][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.632516][ T71] [ 17.632611][ T71] Freed by task 71: [ 17.632759][ T71] kasan_save_stack+0x24/0x40 [ 17.632946][ T71] kasan_save_track+0x14/0x30 [ 17.633224][ T71] __kasan_save_free_info+0x3b/0x60 [ 17.633416][ T71] __kasan_slab_free+0x3f/0x60 [ 17.633598][ T71] kfree+0x21d/0x540 [ 17.633738][ T71] device_release+0x9c/0x210 [ 17.633931][ T71] kobject_cleanup+0xfe/0x360 [ 17.634231][ T71] netdev_run_todo+0x81f/0xc60 [ 17.634417][ T71] ops_undo_list+0x714/0x890 [ 17.634605][ T71] cleanup_net+0x3b2/0x8b0 [ 17.634793][ T71] process_one_work+0xe35/0x1650 [ 17.635061][ T71] worker_thread+0x591/0xcf0 [ 17.635245][ T71] kthread+0x37b/0x5f0 [ 17.635385][ T71] ret_from_fork+0x1db/0x270 [ 17.635575][ T71] ret_from_fork_asm+0x11/0x20 [ 17.635766][ T71] [ 17.635860][ T71] The buggy address belongs to the object at ffff888008cfc000 [ 17.635860][ T71] which belongs to the cache kmalloc-4k of size 4096 [ 17.636333][ T71] The buggy address is located 1732 bytes inside of [ 17.636333][ T71] freed 4096-byte region [ffff888008cfc000, ffff888008cfd000) [ 17.636890][ T71] [ 17.636986][ T71] The buggy address belongs to the physical page: [ 17.637235][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8cf8 [ 17.637571][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 17.637862][ T71] flags: 0x80000000000040(head|node=0|zone=1) [ 17.638203][ T71] page_type: f5(slab) [ 17.638351][ T71] raw: 0080000000000040 ffff888001043700 ffffea000014e010 ffffea00002f7610 [ 17.638682][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 17.639201][ T71] head: 0080000000000040 ffff888001043700 ffffea000014e010 ffffea00002f7610 [ 17.639539][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 17.639956][ T71] head: 0080000000000003 ffffea0000233e01 00000000ffffffff 00000000ffffffff [ 17.640392][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 17.640715][ T71] page dumped because: kasan: bad access detected [ 17.640954][ T71] [ 17.641047][ T71] Memory state around the buggy address: [ 17.641324][ T71] ffff888008cfc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.641601][ T71] ffff888008cfc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.641882][ T71] >ffff888008cfc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.642167][ T71] ^ [ 17.642588][ T71] ffff888008cfc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.642856][ T71] ffff888008cfc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.643120][ T71] ================================================================== [ 17.644041][ T71] Disabling lock debugging due to kernel taint [ 17.644284][ T71] ------------[ cut here ]------------ [ 17.644516][ T71] refcount_t: underflow; use-after-free. [ 17.645859][ T71] WARNING: CPU: 0 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0 [ 17.646208][ T71] Modules linked in: [ 17.646361][ T71] CPU: 0 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full) [ 17.646778][ T71] Tainted: [B]=BAD_PAGE [ 17.646906][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.647156][ T71] Workqueue: netns cleanup_net [ 17.647359][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0 [ 17.647586][ T71] 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 a5 93 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 [ 17.648194][ T71] RSP: 0000:ffffc900004c7a08 EFLAGS: 00010282 [ 17.648416][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 17.648665][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001 [ 17.648939][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2940934 [ 17.649196][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001 [ 17.649491][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100 [ 17.649761][ T71] FS: 0000000000000000(0000) GS:ffff8880d7108000(0000) knlGS:0000000000000000 [ 17.650073][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 17.650302][ T71] CR2: 00007f89faa3d178 CR3: 0000000019949004 CR4: 0000000000772ef0 [ 17.650569][ T71] PKRU: 55555554 [ 17.650705][ T71] Call Trace: [ 17.650850][ T71] [ 17.650944][ T71] netdev_run_todo+0x5f0/0xc60 [ 17.651127][ T71] ? dev_ingress_queue_create+0x190/0x190 [ 17.651307][ T71] ? generic_xdp_install+0x410/0x410 [ 17.651514][ T71] ? net_generic+0xb1/0x1f0 [ 17.651686][ T71] ops_undo_list+0x714/0x890 [ 17.651862][ T71] ? rtnl_net_dumpid_one+0x270/0x270 [ 17.652049][ T71] ? cleanup_net+0x2d6/0x8b0 [ 17.652224][ T71] cleanup_net+0x3b2/0x8b0 [ 17.652397][ T71] ? net_passive_dec+0x190/0x190 [ 17.652586][ T71] ? rcu_is_watching+0x12/0xb0 [ 17.652754][ T71] process_one_work+0xe35/0x1650 [ 17.652939][ T71] ? pwq_dec_nr_in_flight+0x550/0x550 [ 17.653137][ T71] ? assign_work+0x168/0x240 [ 17.653311][ T71] worker_thread+0x591/0xcf0 [ 17.653583][ T71] ? rescuer_thread+0xd10/0xd10 [ 17.653775][ T71] kthread+0x37b/0x5f0 [ 17.653914][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.654100][ T71] ? ret_from_fork+0x1b/0x270 [ 17.654273][ T71] ? __lock_release+0x5d/0x170 [ 17.654505][ T71] ? rcu_is_watching+0x12/0xb0 [ 17.654699][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.654886][ T71] ret_from_fork+0x1db/0x270 [ 17.655078][ T71] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.655250][ T71] ret_from_fork_asm+0x11/0x20 [ 17.655508][ T71] [ 17.655650][ T71] irq event stamp: 9649 [ 17.655798][ T71] hardirqs last enabled at (9649): [] irqentry_exit+0x3b/0x80 [ 17.656089][ T71] hardirqs last disabled at (9648): [] handle_softirqs+0x47f/0x610 [ 17.656463][ T71] softirqs last enabled at (8670): [] handle_softirqs+0x352/0x610 [ 17.656778][ T71] softirqs last disabled at (8663): [] irq_exit_rcu+0xab/0x100 [ 17.657085][ T71] ---[ end trace 0000000000000000 ]---