usb 7-1: new high-speed USB device number 11 using dummy_hcd usb 7-1: Using ep0 maxpacket: 16 usb 7-1: device descriptor read/all, error -71 usb 7-1: new full-speed USB device number 12 using dummy_hcd usb 7-1: device descriptor read/all, error -71 usb usb7-port1: attempt power cycle ================================================================== BUG: KASAN: slab-use-after-free in __raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline] BUG: KASAN: slab-use-after-free in _raw_spin_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:170 Read of size 1 at addr ffff888021aa48c0 by task kworker/0:9/5960 CPU: 0 UID: 0 PID: 5960 Comm: kworker/0:9 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: usb_hub_wq hub_event Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x79/0x2e0 kernel/locking/lockdep.c:5842 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:170 rtlock_slowlock_locked+0x3640/0x3c80 kernel/locking/rtmutex.c:1871 rtlock_slowlock kernel/locking/rtmutex.c:1895 [inline] rtlock_lock kernel/locking/spinlock_rt.c:43 [inline] __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline] rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57 spin_lock include/linux/spinlock_rt.h:45 [inline] raw_event_queue_add drivers/usb/gadget/legacy/raw_gadget.c:68 [inline] raw_queue_event+0x39/0x2e0 drivers/usb/gadget/legacy/raw_gadget.c:240 gadget_disconnect+0x51/0xe0 drivers/usb/gadget/legacy/raw_gadget.c:388 set_link_state+0xc0a/0x1220 drivers/usb/gadget/udc/dummy_hcd.c:471 dummy_hub_control+0xafc/0x1a00 drivers/usb/gadget/udc/dummy_hcd.c:-1 rh_call_control drivers/usb/core/hcd.c:652 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline] usb_hcd_submit_urb+0xdbe/0x1b50 drivers/usb/core/hcd.c:1538 usb_start_wait_urb+0x12b/0x510 drivers/usb/core/message.c:59 usb_internal_control_msg drivers/usb/core/message.c:103 [inline] usb_control_msg+0x232/0x3e0 drivers/usb/core/message.c:154 usb_clear_port_feature drivers/usb/core/hub.c:456 [inline] usb_hub_set_port_power drivers/usb/core/hub.c:894 [inline] hub_port_connect drivers/usb/core/hub.c:5607 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x2dc0/0x4f60 drivers/usb/core/hub.c:5953 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 12397: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x3a6/0x690 mm/slub.c:5383 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] dev_new drivers/usb/gadget/legacy/raw_gadget.c:193 [inline] raw_open+0x8d/0x530 drivers/usb/gadget/legacy/raw_gadget.c:435 misc_open+0x2de/0x350 drivers/char/misc.c:163 chrdev_open+0x4d0/0x5f0 fs/char_dev.c:411 do_dentry_open+0x83d/0x13e0 fs/open.c:949 vfs_open+0x3b/0x350 fs/open.c:1081 do_open fs/namei.c:4671 [inline] path_openat+0x2e43/0x38a0 fs/namei.c:4830 do_file_open+0x23e/0x4a0 fs/namei.c:4859 do_sys_openat2+0x113/0x200 fs/open.c:1366 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1383 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 12397: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2692 [inline] slab_free mm/slub.c:6168 [inline] kfree+0x1c1/0x6c0 mm/slub.c:6486 kref_put include/linux/kref.h:65 [inline] raw_release+0x191/0x260 drivers/usb/gadget/legacy/raw_gadget.c:474 __fput+0x461/0xa90 fs/file_table.c:469 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x70f/0x23c0 kernel/exit.c:976 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118 get_signal+0x125c/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888021aa4000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2240 bytes inside of freed 4096-byte region [ffff888021aa4000, ffff888021aa5000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21aa0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff88813fe1d140 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000 head: 0080000000000040 ffff88813fe1d140 dead000000000100 dead000000000122 head: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000 head: 0080000000000003 ffffea000086a801 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 4048120279, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_slab_page mm/slub.c:3296 [inline] allocate_slab+0x77/0x660 mm/slub.c:3485 new_slab mm/slub.c:3543 [inline] refill_objects+0x334/0x3c0 mm/slub.c:7178 __pcs_replace_empty_main+0x371/0x5c0 mm/slub.c:-1 alloc_from_pcs mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:4854 [inline] __kmalloc_cache_noprof+0x44e/0x690 mm/slub.c:5378 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] pci_alloc_dev+0x4f/0x1d0 drivers/pci/probe.c:2505 pci_scan_device drivers/pci/probe.c:2606 [inline] pci_scan_single_device+0xc3/0x230 drivers/pci/probe.c:2789 pci_scan_slot+0x1c5/0x5c0 drivers/pci/probe.c:2876 pci_scan_child_bus_extend+0x68/0x7d0 drivers/pci/probe.c:3095 acpi_pci_root_create+0xa75/0xca0 drivers/acpi/pci_root.c:1049 pci_acpi_scan_root+0x3a3/0x580 arch/x86/pci/acpi.c:574 acpi_pci_root_add+0x1cd4/0x2db0 drivers/acpi/pci_root.c:728 acpi_scan_attach_handler drivers/acpi/scan.c:2278 [inline] acpi_bus_attach+0x7d7/0xc10 drivers/acpi/scan.c:2327 device_for_each_child+0x10b/0x1a0 drivers/base/core.c:4018 page_owner free stack trace missing Memory state around the buggy address: ffff888021aa4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888021aa4800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888021aa4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888021aa4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888021aa4980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================