[ 24.766211][ T12] ================================================================== [ 24.766576][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0 [ 24.766840][ T12] Read of size 1 at addr ffff888008c496c4 by task kworker/u16:0/12 [ 24.767099][ T12] [ 24.767188][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full) [ 24.767193][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 24.767195][ T12] Workqueue: netns cleanup_net [ 24.767208][ T12] Call Trace: [ 24.767210][ T12] [ 24.767212][ T12] dump_stack_lvl+0x82/0xc0 [ 24.767218][ T12] print_address_description.constprop.0+0x2c/0x3a0 [ 24.767229][ T12] ? kobject_put+0xbb/0xd0 [ 24.767232][ T12] print_report+0xb4/0x270 [ 24.767236][ T12] ? kobject_put+0xbb/0xd0 [ 24.767239][ T12] ? kasan_addr_to_slab+0x21/0x70 [ 24.767243][ T12] ? kobject_put+0xbb/0xd0 [ 24.767246][ T12] kasan_report+0xca/0x100 [ 24.767250][ T12] ? kobject_put+0xbb/0xd0 [ 24.767255][ T12] kobject_put+0xbb/0xd0 [ 24.767260][ T12] netdev_run_todo+0x5f0/0xc60 [ 24.767271][ T12] ? dev_ingress_queue_create+0x190/0x190 [ 24.767276][ T12] ? generic_xdp_install+0x410/0x410 [ 24.767280][ T12] ? net_generic+0xb1/0x1f0 [ 24.767292][ T12] ops_undo_list+0x714/0x890 [ 24.767298][ T12] ? rtnl_net_dumpid_one+0x270/0x270 [ 24.767301][ T12] ? cleanup_net+0x2d6/0x8b0 [ 24.767307][ T12] cleanup_net+0x3b2/0x8b0 [ 24.767311][ T12] ? net_passive_dec+0x190/0x190 [ 24.767316][ T12] ? rcu_is_watching+0x12/0xb0 [ 24.767325][ T12] process_one_work+0xe35/0x1650 [ 24.767336][ T12] ? pwq_dec_nr_in_flight+0x550/0x550 [ 24.767342][ T12] ? assign_work+0x168/0x240 [ 24.767347][ T12] worker_thread+0x591/0xcf0 [ 24.767352][ T12] ? rescuer_thread+0xd10/0xd10 [ 24.767356][ T12] kthread+0x37b/0x5f0 [ 24.767361][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 24.767366][ T12] ? ret_from_fork+0x1b/0x270 [ 24.767372][ T12] ? __lock_release+0x5d/0x170 [ 24.767377][ T12] ? rcu_is_watching+0x12/0xb0 [ 24.767381][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 24.767385][ T12] ret_from_fork+0x1db/0x270 [ 24.767387][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 24.767390][ T12] ret_from_fork_asm+0x11/0x20 [ 24.767402][ T12] [ 24.767403][ T12] [ 24.774140][ T12] Allocated by task 260: [ 24.774273][ T12] kasan_save_stack+0x24/0x40 [ 24.774456][ T12] kasan_save_track+0x14/0x30 [ 24.774626][ T12] __kasan_kmalloc+0x7b/0x90 [ 24.774800][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0 [ 24.774972][ T12] alloc_netdev_mqs+0x7d/0x1370 [ 24.775150][ T12] ip6_tnl_init_net+0x102/0x3f0 [ 24.775356][ T12] ops_init+0x189/0x550 [ 24.775488][ T12] setup_net+0xf1/0x380 [ 24.775618][ T12] copy_net_ns+0x253/0x510 [ 24.775792][ T12] create_new_namespaces+0x35f/0x900 [ 24.775966][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0 [ 24.776145][ T12] ksys_unshare+0x2be/0x6e0 [ 24.776325][ T12] __x64_sys_unshare+0x31/0x40 [ 24.776496][ T12] do_syscall_64+0xc1/0xfd0 [ 24.776669][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 24.776886][ T12] [ 24.776977][ T12] Freed by task 12: [ 24.777115][ T12] kasan_save_stack+0x24/0x40 [ 24.777300][ T12] kasan_save_track+0x14/0x30 [ 24.777475][ T12] __kasan_save_free_info+0x3b/0x60 [ 24.777648][ T12] __kasan_slab_free+0x3f/0x60 [ 24.777817][ T12] kfree+0x21d/0x540 [ 24.777944][ T12] device_release+0x9c/0x210 [ 24.778130][ T12] kobject_cleanup+0xfe/0x360 [ 24.778320][ T12] netdev_run_todo+0x81f/0xc60 [ 24.778496][ T12] ops_undo_list+0x714/0x890 [ 24.778667][ T12] cleanup_net+0x3b2/0x8b0 [ 24.778838][ T12] process_one_work+0xe35/0x1650 [ 24.779010][ T12] worker_thread+0x591/0xcf0 [ 24.779187][ T12] kthread+0x37b/0x5f0 [ 24.779324][ T12] ret_from_fork+0x1db/0x270 [ 24.779497][ T12] ret_from_fork_asm+0x11/0x20 [ 24.779669][ T12] [ 24.779755][ T12] The buggy address belongs to the object at ffff888008c49000 [ 24.779755][ T12] which belongs to the cache kmalloc-4k of size 4096 [ 24.780287][ T12] The buggy address is located 1732 bytes inside of [ 24.780287][ T12] freed 4096-byte region [ffff888008c49000, ffff888008c4a000) [ 24.780787][ T12] [ 24.780881][ T12] The buggy address belongs to the physical page: [ 24.781100][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8c48 [ 24.781416][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 24.781769][ T12] flags: 0x80000000000040(head|node=0|zone=1) [ 24.781987][ T12] page_type: f5(slab) [ 24.782127][ T12] raw: 0080000000000040 ffff888001043700 ffffea000022c010 ffffea000023e410 [ 24.782544][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 24.782841][ T12] head: 0080000000000040 ffff888001043700 ffffea000022c010 ffffea000023e410 [ 24.783149][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 24.783457][ T12] head: 0080000000000003 ffffea0000231201 00000000ffffffff 00000000ffffffff [ 24.783759][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 24.784158][ T12] page dumped because: kasan: bad access detected [ 24.784377][ T12] [ 24.784462][ T12] Memory state around the buggy address: [ 24.784710][ T12] ffff888008c49580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.784968][ T12] ffff888008c49600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.785232][ T12] >ffff888008c49680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.785485][ T12] ^ [ 24.785688][ T12] ffff888008c49700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.785934][ T12] ffff888008c49780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.786197][ T12] ================================================================== [ 24.786799][ T12] Disabling lock debugging due to kernel taint [ 24.787010][ T12] ------------[ cut here ]------------ [ 24.787173][ T12] refcount_t: underflow; use-after-free. [ 24.787414][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0 [ 24.787712][ T12] Modules linked in: sch_fq [ 24.787981][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full) [ 24.788371][ T12] Tainted: [B]=BAD_PAGE [ 24.788500][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 24.788709][ T12] Workqueue: netns cleanup_net [ 24.788989][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0 [ 24.789221][ 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 a5 9c 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 [ 24.789923][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282 [ 24.790145][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 24.790586][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001 [ 24.790842][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3b40934 [ 24.791182][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001 [ 24.791444][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100 [ 24.791697][ T12] FS: 0000000000000000(0000) GS:ffff8880ce288000(0000) knlGS:0000000000000000 [ 24.791995][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.792217][ T12] CR2: 00007f76ee0f5ae0 CR3: 000000003f149006 CR4: 0000000000772ef0 [ 24.792479][ T12] PKRU: 55555554 [ 24.792606][ T12] Call Trace: [ 24.792744][ T12] [ 24.792832][ T12] netdev_run_todo+0x5f0/0xc60 [ 24.793104][ T12] ? dev_ingress_queue_create+0x190/0x190 [ 24.793283][ T12] ? generic_xdp_install+0x410/0x410 [ 24.793451][ T12] ? net_generic+0xb1/0x1f0 [ 24.793715][ T12] ops_undo_list+0x714/0x890 [ 24.793887][ T12] ? rtnl_net_dumpid_one+0x270/0x270 [ 24.794051][ T12] ? cleanup_net+0x2d6/0x8b0 [ 24.794235][ T12] cleanup_net+0x3b2/0x8b0 [ 24.794406][ T12] ? net_passive_dec+0x190/0x190 [ 24.794572][ T12] ? rcu_is_watching+0x12/0xb0 [ 24.794827][ T12] process_one_work+0xe35/0x1650 [ 24.794998][ T12] ? pwq_dec_nr_in_flight+0x550/0x550 [ 24.795187][ T12] ? assign_work+0x168/0x240 [ 24.795365][ T12] worker_thread+0x591/0xcf0 [ 24.795538][ T12] ? rescuer_thread+0xd10/0xd10 [ 24.795711][ T12] kthread+0x37b/0x5f0 [ 24.795843][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 24.796101][ T12] ? ret_from_fork+0x1b/0x270 [ 24.796277][ T12] ? __lock_release+0x5d/0x170 [ 24.796447][ T12] ? rcu_is_watching+0x12/0xb0 [ 24.796700][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 24.796867][ T12] ret_from_fork+0x1db/0x270 [ 24.797033][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 24.797206][ T12] ret_from_fork_asm+0x11/0x20 [ 24.797476][ T12] [ 24.797601][ T12] irq event stamp: 11649 [ 24.797731][ T12] hardirqs last enabled at (11649): [] irqentry_exit+0x3b/0x80 [ 24.798113][ T12] hardirqs last disabled at (11648): [] handle_softirqs+0x47f/0x610 [ 24.798497][ T12] softirqs last enabled at (10928): [] handle_softirqs+0x352/0x610 [ 24.798802][ T12] softirqs last disabled at (10921): [] irq_exit_rcu+0xab/0x100 [ 24.799179][ T12] ---[ end trace 0000000000000000 ]---