[ 17.346271][ T70] ================================================================== [ 17.346712][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0 [ 17.347123][ T70] Read of size 1 at addr ffff88800f0e46c4 by task kworker/u16:1/70 [ 17.347506][ T70] [ 17.347654][ T70] CPU: 3 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full) [ 17.347662][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.347666][ T70] Workqueue: netns cleanup_net [ 17.347679][ T70] Call Trace: [ 17.347683][ T70] [ 17.347686][ T70] dump_stack_lvl+0x82/0xc0 [ 17.347696][ T70] print_address_description.constprop.0+0x2c/0x3a0 [ 17.347707][ T70] ? kobject_put+0xbb/0xd0 [ 17.347713][ T70] print_report+0xb4/0x270 [ 17.347719][ T70] ? kobject_put+0xbb/0xd0 [ 17.347724][ T70] ? kasan_addr_to_slab+0x21/0x70 [ 17.347730][ T70] ? kobject_put+0xbb/0xd0 [ 17.347735][ T70] kasan_report+0xca/0x100 [ 17.347742][ T70] ? kobject_put+0xbb/0xd0 [ 17.347752][ T70] kobject_put+0xbb/0xd0 [ 17.347757][ T70] netdev_run_todo+0x5f0/0xc60 [ 17.347767][ T70] ? dev_ingress_queue_create+0x190/0x190 [ 17.347773][ T70] ? generic_xdp_install+0x410/0x410 [ 17.347778][ T70] ? net_generic+0xb1/0x1f0 [ 17.347793][ T70] ops_undo_list+0x714/0x890 [ 17.347802][ T70] ? rtnl_net_dumpid_one+0x270/0x270 [ 17.347807][ T70] ? cleanup_net+0x2d6/0x8b0 [ 17.347817][ T70] cleanup_net+0x3b2/0x8b0 [ 17.347825][ T70] ? net_passive_dec+0x190/0x190 [ 17.347833][ T70] ? rcu_is_watching+0x12/0xb0 [ 17.347842][ T70] process_one_work+0xe35/0x1650 [ 17.347856][ T70] ? pwq_dec_nr_in_flight+0x550/0x550 [ 17.347867][ T70] ? assign_work+0x168/0x240 [ 17.347875][ T70] worker_thread+0x591/0xcf0 [ 17.347886][ T70] ? rescuer_thread+0xd10/0xd10 [ 17.347892][ T70] kthread+0x37b/0x5f0 [ 17.347900][ T70] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.347905][ T70] ? ret_from_fork+0x1b/0x270 [ 17.347912][ T70] ? __lock_release+0x5d/0x170 [ 17.347920][ T70] ? rcu_is_watching+0x12/0xb0 [ 17.347925][ T70] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.347932][ T70] ret_from_fork+0x1db/0x270 [ 17.347937][ T70] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.347942][ T70] ret_from_fork_asm+0x11/0x20 [ 17.347958][ T70] [ 17.347960][ T70] [ 17.358084][ T70] Allocated by task 270: [ 17.358289][ T70] kasan_save_stack+0x24/0x40 [ 17.358569][ T70] kasan_save_track+0x14/0x30 [ 17.358841][ T70] __kasan_kmalloc+0x7b/0x90 [ 17.359108][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0 [ 17.359387][ T70] alloc_netdev_mqs+0x7d/0x1370 [ 17.359660][ T70] ip6_tnl_init_net+0x102/0x3f0 [ 17.359940][ T70] ops_init+0x189/0x550 [ 17.360138][ T70] setup_net+0xf1/0x380 [ 17.360266][ T70] copy_net_ns+0x253/0x510 [ 17.360454][ T70] create_new_namespaces+0x35f/0x900 [ 17.360629][ T70] unshare_nsproxy_namespaces+0x8a/0x1a0 [ 17.360795][ T70] ksys_unshare+0x2be/0x6e0 [ 17.360970][ T70] __x64_sys_unshare+0x31/0x40 [ 17.361137][ T70] do_syscall_64+0xc1/0xfd0 [ 17.361305][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.361532][ T70] [ 17.361619][ T70] Freed by task 70: [ 17.361744][ T70] kasan_save_stack+0x24/0x40 [ 17.361912][ T70] kasan_save_track+0x14/0x30 [ 17.362081][ T70] __kasan_save_free_info+0x3b/0x60 [ 17.362253][ T70] __kasan_slab_free+0x3f/0x60 [ 17.362476][ T70] kfree+0x21d/0x540 [ 17.362682][ T70] device_release+0x9c/0x210 [ 17.362958][ T70] kobject_cleanup+0xfe/0x360 [ 17.363221][ T70] netdev_run_todo+0x81f/0xc60 [ 17.363403][ T70] ops_undo_list+0x714/0x890 [ 17.363571][ T70] cleanup_net+0x3b2/0x8b0 [ 17.363739][ T70] process_one_work+0xe35/0x1650 [ 17.363914][ T70] worker_thread+0x591/0xcf0 [ 17.364083][ T70] kthread+0x37b/0x5f0 [ 17.364223][ T70] ret_from_fork+0x1db/0x270 [ 17.364403][ T70] ret_from_fork_asm+0x11/0x20 [ 17.364573][ T70] [ 17.364659][ T70] The buggy address belongs to the object at ffff88800f0e4000 [ 17.364659][ T70] which belongs to the cache kmalloc-4k of size 4096 [ 17.365065][ T70] The buggy address is located 1732 bytes inside of [ 17.365065][ T70] freed 4096-byte region [ffff88800f0e4000, ffff88800f0e5000) [ 17.365490][ T70] [ 17.365575][ T70] The buggy address belongs to the physical page: [ 17.365781][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xf0e0 [ 17.366076][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 17.366344][ T70] flags: 0x80000000000040(head|node=0|zone=1) [ 17.366565][ T70] page_type: f5(slab) [ 17.366697][ T70] raw: 0080000000000040 ffff888001043700 ffffea00003c5010 ffffea000030a210 [ 17.366995][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 17.367293][ T70] head: 0080000000000040 ffff888001043700 ffffea00003c5010 ffffea000030a210 [ 17.367770][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 17.368252][ T70] head: 0080000000000003 ffffea00003c3801 00000000ffffffff 00000000ffffffff [ 17.368676][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 17.368968][ T70] page dumped because: kasan: bad access detected [ 17.369175][ T70] [ 17.369259][ T70] Memory state around the buggy address: [ 17.369428][ T70] ffff88800f0e4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.369676][ T70] ffff88800f0e4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.369917][ T70] >ffff88800f0e4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.370165][ T70] ^ [ 17.370389][ T70] ffff88800f0e4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.370632][ T70] ffff88800f0e4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 17.370872][ T70] ================================================================== [ 17.372492][ T70] Disabling lock debugging due to kernel taint [ 17.372716][ T70] ------------[ cut here ]------------ [ 17.372872][ T70] refcount_t: underflow; use-after-free. [ 17.373062][ T70] WARNING: CPU: 3 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0 [ 17.373367][ T70] Modules linked in: [ 17.373503][ T70] CPU: 3 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full) [ 17.373880][ T70] Tainted: [B]=BAD_PAGE [ 17.374007][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.374222][ T70] Workqueue: netns cleanup_net [ 17.374432][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0 [ 17.374650][ T70] 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 65 98 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 [ 17.375254][ T70] RSP: 0000:ffffc900004b7a08 EFLAGS: 00010282 [ 17.375470][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 17.376308][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001 [ 17.376567][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff32c0934 [ 17.376880][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001 [ 17.377131][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100 [ 17.377402][ T70] FS: 0000000000000000(0000) GS:ffff8880cc288000(0000) knlGS:0000000000000000 [ 17.377752][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 17.377966][ T70] CR2: 00007ff1456619c0 CR3: 000000006c349004 CR4: 0000000000772ef0 [ 17.378212][ T70] PKRU: 55555554 [ 17.378345][ T70] Call Trace: [ 17.378471][ T70] [ 17.378558][ T70] netdev_run_todo+0x5f0/0xc60 [ 17.378794][ T70] ? dev_ingress_queue_create+0x190/0x190 [ 17.378963][ T70] ? generic_xdp_install+0x410/0x410 [ 17.379130][ T70] ? net_generic+0xb1/0x1f0 [ 17.379299][ T70] ops_undo_list+0x714/0x890 [ 17.379474][ T70] ? rtnl_net_dumpid_one+0x270/0x270 [ 17.379641][ T70] ? cleanup_net+0x2d6/0x8b0 [ 17.379871][ T70] cleanup_net+0x3b2/0x8b0 [ 17.380032][ T70] ? net_passive_dec+0x190/0x190 [ 17.380196][ T70] ? rcu_is_watching+0x12/0xb0 [ 17.380391][ T70] process_one_work+0xe35/0x1650 [ 17.380566][ T70] ? pwq_dec_nr_in_flight+0x550/0x550 [ 17.380796][ T70] ? assign_work+0x168/0x240 [ 17.380964][ T70] worker_thread+0x591/0xcf0 [ 17.381128][ T70] ? rescuer_thread+0xd10/0xd10 [ 17.381291][ T70] kthread+0x37b/0x5f0 [ 17.381422][ T70] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.381586][ T70] ? ret_from_fork+0x1b/0x270 [ 17.381808][ T70] ? __lock_release+0x5d/0x170 [ 17.381981][ T70] ? rcu_is_watching+0x12/0xb0 [ 17.382144][ T70] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.382308][ T70] ret_from_fork+0x1db/0x270 [ 17.382484][ T70] ? kthread_is_per_cpu+0xc0/0xc0 [ 17.382650][ T70] ret_from_fork_asm+0x11/0x20 [ 17.382881][ T70] [ 17.383006][ T70] irq event stamp: 9657 [ 17.383132][ T70] hardirqs last enabled at (9657): [] finish_task_switch.isra.0+0x245/0x960 [ 17.383468][ T70] hardirqs last disabled at (9656): [] __schedule+0x94a/0x1b10 [ 17.383819][ T70] softirqs last enabled at (9068): [] handle_softirqs+0x352/0x610 [ 17.384112][ T70] softirqs last disabled at (9063): [] irq_exit_rcu+0xab/0x100 [ 17.384415][ T70] ---[ end trace 0000000000000000 ]---