usb 3-1: unable to read config index 0 descriptor/start: -61 usb 3-1: can't read configurations, error -61 usb 3-1: new high-speed USB device number 26 using dummy_hcd usb 3-1: unable to read config index 0 descriptor/start: -71 usb 3-1: can't read configurations, error -71 usb usb3-port1: attempt power cycle ================================================================== BUG: KASAN: slab-use-after-free in rt_mutex_owner include/linux/rtmutex.h:52 [inline] BUG: KASAN: slab-use-after-free in rtmutex_spin_on_owner kernel/locking/rtmutex.c:1490 [inline] BUG: KASAN: slab-use-after-free in rtlock_slowlock_locked+0x3460/0x3c80 kernel/locking/rtmutex.c:1866 Read of size 8 at addr ffff888039dc48f8 by task kworker/0:4/1808 CPU: 0 UID: 0 PID: 1808 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 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 rt_mutex_owner include/linux/rtmutex.h:52 [inline] rtmutex_spin_on_owner kernel/locking/rtmutex.c:1490 [inline] rtlock_slowlock_locked+0x3460/0x3c80 kernel/locking/rtmutex.c:1866 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:44 [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:656 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:821 [inline] usb_hcd_submit_urb+0xdbe/0x1b50 drivers/usb/core/hcd.c:1542 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:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Allocated by task 10311: 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+0x1f2/0x6b0 mm/slub.c:5780 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [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:414 do_dentry_open+0x7d0/0x1270 fs/open.c:962 vfs_open+0x3b/0x350 fs/open.c:1094 do_open fs/namei.c:4637 [inline] path_openat+0x34c9/0x3e70 fs/namei.c:4796 do_filp_open+0x22d/0x490 fs/namei.c:4823 do_sys_openat2+0x12f/0x220 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 10310: 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:2540 [inline] slab_free mm/slub.c:6674 [inline] kfree+0x1bb/0x8f0 mm/slub.c:6882 kref_put include/linux/kref.h:65 [inline] raw_release+0x191/0x260 drivers/usb/gadget/legacy/raw_gadget.c:474 __fput+0x45e/0xa80 fs/file_table.c:468 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x69b/0x2320 kernel/exit.c:971 do_group_exit+0x21b/0x2d0 kernel/exit.c:1112 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:41 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:75 __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_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888039dc4000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2296 bytes inside of freed 4096-byte region [ffff888039dc4000, ffff888039dc5000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x39dc0 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 ffff88813fe27140 ffffea0001844600 dead000000000002 raw: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 0080000000000040 ffff88813fe27140 ffffea0001844600 dead000000000002 head: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 0080000000000003 ffffea0000e77001 00000000ffffffff 00000000ffffffff head: ffff888039dc1f50 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 7047, tgid 7046 (syz.4.413), ts 129048122481, free_ts 129033584510 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3a0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xaf8/0x13d0 mm/slub.c:4656 __slab_alloc+0xc5/0x1f0 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kvmalloc_node_noprof+0x2f9/0x8f0 mm/slub.c:7140 kvmalloc_array_node_noprof include/linux/slab.h:1122 [inline] __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:481 [inline] ptr_ring_init_noprof include/linux/ptr_ring.h:499 [inline] skb_array_init_noprof include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x252/0x6f0 net/sched/sch_generic.c:870 qdisc_create_dflt+0x13b/0x4c0 net/sched/sch_generic.c:1015 mq_init+0x2db/0x690 net/sched/sch_mq.c:90 qdisc_create+0x7ac/0xea0 net/sched/sch_api.c:1319 __tc_modify_qdisc net/sched/sch_api.c:1753 [inline] tc_modify_qdisc+0x16f0/0x2290 net/sched/sch_api.c:1817 rtnetlink_rcv_msg+0x77e/0xbe0 net/core/rtnetlink.c:6967 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x831/0x9f0 net/netlink/af_netlink.c:1344 page last free pid 5795 tgid 5795 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xfd0/0x1160 mm/page_alloc.c:2973 discard_slab mm/slub.c:3346 [inline] __put_partials+0x149/0x170 mm/slub.c:3886 __slab_free+0x2af/0x330 mm/slub.c:5956 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x188/0x6a0 mm/slub.c:5270 getname_flags+0xb7/0x540 fs/namei.c:146 getname include/linux/fs.h:2500 [inline] getname_maybe_null include/linux/fs.h:2507 [inline] vfs_fstatat+0x43/0x170 fs/stat.c:370 __do_sys_newfstatat fs/stat.c:542 [inline] __se_sys_newfstatat fs/stat.c:536 [inline] __x64_sys_newfstatat+0x151/0x200 fs/stat.c:536 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888039dc4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888039dc4800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888039dc4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888039dc4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888039dc4980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================