[ 19.047458][ T12] ================================================================== [ 19.047741][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0 [ 19.047986][ T12] Read of size 1 at addr ffff888007ac16c4 by task kworker/u16:0/12 [ 19.048215][ T12] [ 19.048296][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full) [ 19.048302][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 19.048305][ T12] Workqueue: netns cleanup_net [ 19.048315][ T12] Call Trace: [ 19.048317][ T12] [ 19.048320][ T12] dump_stack_lvl+0x82/0xc0 [ 19.048325][ T12] print_address_description.constprop.0+0x2c/0x3a0 [ 19.048334][ T12] ? kobject_put+0xbb/0xd0 [ 19.048337][ T12] print_report+0xb4/0x270 [ 19.048341][ T12] ? kobject_put+0xbb/0xd0 [ 19.048344][ T12] ? kasan_addr_to_slab+0x21/0x70 [ 19.048348][ T12] ? kobject_put+0xbb/0xd0 [ 19.048351][ T12] kasan_report+0xca/0x100 [ 19.048355][ T12] ? kobject_put+0xbb/0xd0 [ 19.048360][ T12] kobject_put+0xbb/0xd0 [ 19.048364][ T12] netdev_run_todo+0x5f0/0xc60 [ 19.048371][ T12] ? dev_ingress_queue_create+0x190/0x190 [ 19.048374][ T12] ? generic_xdp_install+0x410/0x410 [ 19.048377][ T12] ? net_generic+0xb1/0x1f0 [ 19.048387][ T12] ops_undo_list+0x714/0x890 [ 19.048392][ T12] ? rtnl_net_dumpid_one+0x270/0x270 [ 19.048395][ T12] ? cleanup_net+0x2d6/0x8b0 [ 19.048401][ T12] cleanup_net+0x3b2/0x8b0 [ 19.048406][ T12] ? net_passive_dec+0x190/0x190 [ 19.048410][ T12] ? rcu_is_watching+0x12/0xb0 [ 19.048419][ T12] process_one_work+0xe35/0x1650 [ 19.048429][ T12] ? pwq_dec_nr_in_flight+0x550/0x550 [ 19.048435][ T12] ? assign_work+0x168/0x240 [ 19.048440][ T12] worker_thread+0x591/0xcf0 [ 19.048445][ T12] ? rescuer_thread+0xd10/0xd10 [ 19.048449][ T12] kthread+0x37b/0x5f0 [ 19.048454][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 19.048456][ T12] ? ret_from_fork+0x1b/0x270 [ 19.048462][ T12] ? __lock_release+0x5d/0x170 [ 19.048466][ T12] ? rcu_is_watching+0x12/0xb0 [ 19.048470][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 19.048473][ T12] ret_from_fork+0x1db/0x270 [ 19.048476][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 19.048479][ T12] ret_from_fork_asm+0x11/0x20 [ 19.048488][ T12] [ 19.048490][ T12] [ 19.054554][ T12] Allocated by task 257: [ 19.054683][ T12] kasan_save_stack+0x24/0x40 [ 19.054849][ T12] kasan_save_track+0x14/0x30 [ 19.055006][ T12] __kasan_kmalloc+0x7b/0x90 [ 19.055170][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0 [ 19.055334][ T12] alloc_netdev_mqs+0x7d/0x1370 [ 19.055496][ T12] ip6_tnl_init_net+0x102/0x3f0 [ 19.055660][ T12] ops_init+0x189/0x550 [ 19.055778][ T12] setup_net+0xf1/0x380 [ 19.055896][ T12] copy_net_ns+0x253/0x510 [ 19.056050][ T12] create_new_namespaces+0x35f/0x900 [ 19.056211][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0 [ 19.056370][ T12] ksys_unshare+0x2be/0x6e0 [ 19.056528][ T12] __x64_sys_unshare+0x31/0x40 [ 19.056691][ T12] do_syscall_64+0xc1/0xfd0 [ 19.056851][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 19.057052][ T12] [ 19.057135][ T12] Freed by task 12: [ 19.057253][ T12] kasan_save_stack+0x24/0x40 [ 19.057413][ T12] kasan_save_track+0x14/0x30 [ 19.057573][ T12] __kasan_save_free_info+0x3b/0x60 [ 19.057738][ T12] __kasan_slab_free+0x3f/0x60 [ 19.057893][ T12] kfree+0x21d/0x540 [ 19.058009][ T12] device_release+0x9c/0x210 [ 19.058172][ T12] kobject_cleanup+0xfe/0x360 [ 19.058331][ T12] netdev_run_todo+0x81f/0xc60 [ 19.058488][ T12] ops_undo_list+0x714/0x890 [ 19.058655][ T12] cleanup_net+0x3b2/0x8b0 [ 19.058813][ T12] process_one_work+0xe35/0x1650 [ 19.058972][ T12] worker_thread+0x591/0xcf0 [ 19.059128][ T12] kthread+0x37b/0x5f0 [ 19.059259][ T12] ret_from_fork+0x1db/0x270 [ 19.059419][ T12] ret_from_fork_asm+0x11/0x20 [ 19.059583][ T12] [ 19.059673][ T12] The buggy address belongs to the object at ffff888007ac1000 [ 19.059673][ T12] which belongs to the cache kmalloc-4k of size 4096 [ 19.060045][ T12] The buggy address is located 1732 bytes inside of [ 19.060045][ T12] freed 4096-byte region [ffff888007ac1000, ffff888007ac2000) [ 19.060432][ T12] [ 19.060510][ T12] The buggy address belongs to the physical page: [ 19.060716][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ac0 [ 19.060995][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 19.061234][ T12] flags: 0x80000000000040(head|node=0|zone=1) [ 19.061446][ T12] page_type: f5(slab) [ 19.061572][ T12] raw: 0080000000000040 ffff888001043700 ffffea00001eae10 ffffea00001fbe10 [ 19.061858][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 19.062136][ T12] head: 0080000000000040 ffff888001043700 ffffea00001eae10 ffffea00001fbe10 [ 19.062417][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 19.062702][ T12] head: 0080000000000003 ffffea00001eb001 00000000ffffffff 00000000ffffffff [ 19.062978][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 19.063256][ T12] page dumped because: kasan: bad access detected [ 19.063447][ T12] [ 19.063529][ T12] Memory state around the buggy address: [ 19.063691][ T12] ffff888007ac1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 19.063917][ T12] ffff888007ac1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 19.064144][ T12] >ffff888007ac1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 19.064388][ T12] ^ [ 19.064582][ T12] ffff888007ac1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 19.064820][ T12] ffff888007ac1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 19.065047][ T12] ================================================================== [ 19.065383][ T12] Disabling lock debugging due to kernel taint [ 19.065573][ T12] ------------[ cut here ]------------ [ 19.065730][ T12] refcount_t: underflow; use-after-free. [ 19.065915][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0 [ 19.066205][ T12] Modules linked in: unix_diag [ 19.066375][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full) [ 19.066733][ T12] Tainted: [B]=BAD_PAGE [ 19.066852][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 19.067066][ T12] Workqueue: netns cleanup_net [ 19.067237][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0 [ 19.067438][ 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 85 b7 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 [ 19.068014][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282 [ 19.068218][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 19.068453][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001 [ 19.068695][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7100934 [ 19.068942][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001 [ 19.069286][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100 [ 19.069543][ T12] FS: 0000000000000000(0000) GS:ffff8880b3308000(0000) knlGS:0000000000000000 [ 19.069838][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.070043][ T12] CR2: 0000562f7894277c CR3: 000000002fd49004 CR4: 0000000000772ef0 [ 19.070281][ T12] PKRU: 55555554 [ 19.070397][ T12] Call Trace: [ 19.070521][ T12] [ 19.070608][ T12] netdev_run_todo+0x5f0/0xc60 [ 19.070859][ T12] ? dev_ingress_queue_create+0x190/0x190 [ 19.071029][ T12] ? generic_xdp_install+0x410/0x410 [ 19.071189][ T12] ? net_generic+0xb1/0x1f0 [ 19.071348][ T12] ops_undo_list+0x714/0x890 [ 19.071504][ T12] ? rtnl_net_dumpid_one+0x270/0x270 [ 19.071674][ T12] ? cleanup_net+0x2d6/0x8b0 [ 19.071835][ T12] cleanup_net+0x3b2/0x8b0 [ 19.071996][ T12] ? net_passive_dec+0x190/0x190 [ 19.072154][ T12] ? rcu_is_watching+0x12/0xb0 [ 19.072319][ T12] process_one_work+0xe35/0x1650 [ 19.072483][ T12] ? pwq_dec_nr_in_flight+0x550/0x550 [ 19.072647][ T12] ? assign_work+0x168/0x240 [ 19.072807][ T12] worker_thread+0x591/0xcf0 [ 19.072963][ T12] ? rescuer_thread+0xd10/0xd10 [ 19.073137][ T12] kthread+0x37b/0x5f0 [ 19.073258][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 19.073419][ T12] ? ret_from_fork+0x1b/0x270 [ 19.073595][ T12] ? __lock_release+0x5d/0x170 [ 19.073759][ T12] ? rcu_is_watching+0x12/0xb0 [ 19.073917][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 19.074082][ T12] ret_from_fork+0x1db/0x270 [ 19.074240][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 19.074480][ T12] ret_from_fork_asm+0x11/0x20 [ 19.074654][ T12] [ 19.074772][ T12] irq event stamp: 11291 [ 19.074889][ T12] hardirqs last enabled at (11291): [] irqentry_exit+0x3b/0x80 [ 19.075180][ T12] hardirqs last disabled at (11290): [] handle_softirqs+0x47f/0x610 [ 19.075543][ T12] softirqs last enabled at (10670): [] handle_softirqs+0x352/0x610 [ 19.075824][ T12] softirqs last disabled at (10661): [] irq_exit_rcu+0xab/0x100 [ 19.076102][ T12] ---[ end trace 0000000000000000 ]---