================================================================== BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:625 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock+0x130/0x1188 kernel/locking/mutex.c:821 Read of size 8 at addr ffff0000ccd4c4f8 by task kworker/u8:3/53 CPU: 1 UID: 0 PID: 53 Comm: kworker/u8:3 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 Workqueue: usbip_event event_handler Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0x94/0x21c mm/kasan/report.c:378 print_report+0x50/0x68 mm/kasan/report.c:482 kasan_report+0xb0/0x10c mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __mutex_lock_common kernel/locking/mutex.c:625 [inline] __mutex_lock+0x130/0x1188 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 event_handler+0x1dc/0x478 drivers/usb/usbip/usbip_event.c:73 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0x96c/0x12d4 kernel/workqueue.c:3479 worker_thread+0x934/0xe0c kernel/workqueue.c:3560 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 Allocated by task 1: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5414 [inline] __kmalloc_noprof+0x348/0x6bc mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] __usb_create_hcd+0x70/0x7fc drivers/usb/core/hcd.c:2566 usb_create_hcd+0x3c/0x50 drivers/usb/core/hcd.c:2662 vhci_hcd_probe+0x108/0x3b4 drivers/usb/usbip/vhci_hcd.c:1378 platform_probe+0x100/0x1a4 drivers/base/platform.c:1507 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3f8/0xa48 drivers/base/dd.c:706 __driver_probe_device+0x1c8/0x350 drivers/base/dd.c:868 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898 __device_attach_driver+0x248/0x3ec drivers/base/dd.c:1026 bus_for_each_drv+0x224/0x2c0 drivers/base/bus.c:500 __device_attach+0x268/0x3b0 drivers/base/dd.c:1098 device_initial_probe+0x90/0xc8 drivers/base/dd.c:1153 bus_probe_device+0x11c/0x1f8 drivers/base/bus.c:620 device_add+0x6d4/0x9f0 drivers/base/core.c:3776 platform_device_add+0x3e8/0x70c drivers/base/platform.c:833 platform_device_register_full+0x4a0/0x5cc drivers/base/platform.c:970 vhci_hcd_init+0x1b0/0x2ec drivers/usb/usbip/vhci_hcd.c:1557 do_one_initcall+0x274/0xc3c init/main.c:1362 do_initcall_level+0x12c/0x1c4 init/main.c:1424 do_initcalls+0x70/0xd0 init/main.c:1440 do_basic_setup+0x7c/0x90 init/main.c:1460 kernel_init_freeable+0x258/0x398 init/main.c:1675 kernel_init+0x28/0x1e0 init/main.c:1565 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 Freed by task 6719: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6508 [inline] kfree+0x188/0x698 mm/slub.c:6801 hcd_release drivers/usb/core/hcd.c:2690 [inline] kref_put include/linux/kref.h:65 [inline] usb_put_hcd+0x124/0x16c drivers/usb/core/hcd.c:2704 vhci_hcd_remove+0xd8/0xfc drivers/usb/usbip/vhci_hcd.c:1434 platform_remove+0x6c/0x88 drivers/base/platform.c:1524 device_remove drivers/base/dd.c:616 [inline] __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x388/0x6dc drivers/base/dd.c:1372 device_driver_detach+0x48/0x58 drivers/base/dd.c:1408 unbind_store+0x18c/0x1c4 drivers/base/bus.c:244 drv_attr_store+0x80/0xa4 drivers/base/bus.c:125 sysfs_kf_write+0x1a8/0x234 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x398/0x4c4 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x50c/0x9fc fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x68/0xdc arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:57 kasan_record_aux_stack+0xb0/0xc8 mm/kasan/generic.c:556 insert_work+0x54/0x2cc kernel/workqueue.c:2272 __queue_work+0xe2c/0x14a4 kernel/workqueue.c:2448 queue_work_on+0xdc/0x188 kernel/workqueue.c:2501 queue_work include/linux/workqueue.h:700 [inline] usb_hcd_giveback_urb+0x29c/0x350 drivers/usb/core/hcd.c:-1 usb_rh_urb_dequeue drivers/usb/core/hcd.c:845 [inline] unlink1+0x300/0x3a4 drivers/usb/core/hcd.c:1580 usb_hcd_unlink_urb+0xe4/0x1dc drivers/usb/core/hcd.c:1617 usb_kill_urb+0x108/0x31c drivers/usb/core/urb.c:716 hub_quiesce+0x1d0/0x2ac drivers/usb/core/hub.c:1417 hub_suspend+0x6c0/0x864 drivers/usb/core/hub.c:4021 usb_suspend_interface drivers/usb/core/driver.c:1327 [inline] usb_suspend_both+0x23c/0xe38 drivers/usb/core/driver.c:1450 usb_runtime_suspend+0x5c/0x11c drivers/usb/core/driver.c:2004 __rpm_callback+0x268/0x6b4 drivers/base/power/runtime.c:406 rpm_callback drivers/base/power/runtime.c:460 [inline] rpm_suspend+0x648/0x1430 drivers/base/power/runtime.c:695 __pm_runtime_suspend+0x110/0x1c8 drivers/base/power/runtime.c:1167 pm_runtime_put_sync_autosuspend include/linux/pm_runtime.h:740 [inline] usb_new_device+0x8fc/0x1274 drivers/usb/core/hub.c:2740 register_root_hub+0x220/0x574 drivers/usb/core/hcd.c:990 usb_add_hcd+0x94c/0xdfc drivers/usb/core/hcd.c:2987 vhci_hcd_probe+0x13c/0x3b4 drivers/usb/usbip/vhci_hcd.c:1388 platform_probe+0x100/0x1a4 drivers/base/platform.c:1507 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3f8/0xa48 drivers/base/dd.c:706 __driver_probe_device+0x1c8/0x350 drivers/base/dd.c:868 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898 __device_attach_driver+0x248/0x3ec drivers/base/dd.c:1026 bus_for_each_drv+0x224/0x2c0 drivers/base/bus.c:500 __device_attach+0x268/0x3b0 drivers/base/dd.c:1098 device_initial_probe+0x90/0xc8 drivers/base/dd.c:1153 bus_probe_device+0x11c/0x1f8 drivers/base/bus.c:620 device_add+0x6d4/0x9f0 drivers/base/core.c:3776 platform_device_add+0x3e8/0x70c drivers/base/platform.c:833 platform_device_register_full+0x4a0/0x5cc drivers/base/platform.c:970 vhci_hcd_init+0x1b0/0x2ec drivers/usb/usbip/vhci_hcd.c:1557 do_one_initcall+0x274/0xc3c init/main.c:1362 do_initcall_level+0x12c/0x1c4 init/main.c:1424 do_initcalls+0x70/0xd0 init/main.c:1440 do_basic_setup+0x7c/0x90 init/main.c:1460 kernel_init_freeable+0x258/0x398 init/main.c:1675 kernel_init+0x28/0x1e0 init/main.c:1565 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 Second to last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:57 kasan_record_aux_stack+0xb0/0xc8 mm/kasan/generic.c:556 insert_work+0x54/0x2cc kernel/workqueue.c:2272 __queue_work+0xe2c/0x14a4 kernel/workqueue.c:2448 queue_work_on+0xdc/0x188 kernel/workqueue.c:2501 queue_work include/linux/workqueue.h:700 [inline] usb_hcd_giveback_urb+0x29c/0x350 drivers/usb/core/hcd.c:-1 rh_call_control drivers/usb/core/hcd.c:706 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline] usb_hcd_submit_urb+0x948/0x17b0 drivers/usb/core/hcd.c:1538 usb_submit_urb+0xd58/0x1484 drivers/usb/core/urb.c:586 usb_start_wait_urb+0x104/0x478 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:117 [inline] usb_control_msg+0x1e8/0x378 drivers/usb/core/message.c:167 get_port_status drivers/usb/core/hub.c:607 [inline] hub_ext_port_status+0xf0/0x738 drivers/usb/core/hub.c:624 usb_hub_port_status drivers/usb/core/hub.c:674 [inline] hub_activate+0x5d4/0x16a8 drivers/usb/core/hub.c:1190 hub_init_func2+0x24/0x34 drivers/usb/core/hub.c:1373 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0x96c/0x12d4 kernel/workqueue.c:3479 worker_thread+0x934/0xe0c kernel/workqueue.c:3560 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 The buggy address belongs to the object at ffff0000ccd4c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 1272 bytes inside of freed 8192-byte region [ffff0000ccd4c000, ffff0000ccd4e000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10cd48 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002280 dead000000000122 0000000000000000 head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc3335201 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ccd4c380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ccd4c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000ccd4c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000ccd4c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ccd4c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== : stop threads : release socket : disconnect device : stop threads : release socket : disconnect device : stop threads : release socket : disconnect device : stop threads : release socket : disconnect device : stop threads : release socket : disconnect device : stop threads : release socket : disconnect device : stop threads : release socket : disconnect device : stop threads : release socket : disconnect device