vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device ================================================================== BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166 Read of size 1 at addr ffff88802c395d10 by task kworker/u8:9/1185 CPU: 0 UID: 0 PID: 1185 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Workqueue: usbip_event event_handler Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 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+0x84/0x350 kernel/locking/lockdep.c:5844 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166 rt_mutex_slowunlock+0xbf/0x8b0 kernel/locking/rtmutex.c:1430 spin_unlock_irqrestore include/linux/spinlock_rt.h:129 [inline] __wake_up_common_lock+0x18a/0x1e0 kernel/sched/wait.c:127 event_handler+0x3cb/0x4b0 drivers/usb/usbip/usbip_event.c:96 process_one_work+0x98b/0x1630 kernel/workqueue.c:3318 process_scheduled_works kernel/workqueue.c:3401 [inline] worker_thread+0xb49/0x1140 kernel/workqueue.c:3482 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 1: 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] __do_kmalloc_node mm/slub.c:5309 [inline] __kmalloc_noprof+0x3e7/0x7b0 mm/slub.c:5322 _kmalloc_noprof include/linux/slab.h:971 [inline] _kzalloc_noprof include/linux/slab.h:1284 [inline] __usb_create_hcd+0x67/0x920 drivers/usb/core/hcd.c:2564 vhci_hcd_probe+0x104/0x3f0 drivers/usb/usbip/vhci_hcd.c:1378 platform_probe+0xf9/0x190 drivers/base/platform.c:1432 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1154 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7ec/0xb90 drivers/base/core.c:3702 platform_device_add+0x46a/0x800 drivers/base/platform.c:762 platform_device_register_full+0x60a/0x6f0 drivers/base/platform.c:902 vhci_hcd_init+0x220/0x360 drivers/usb/usbip/vhci_hcd.c:1557 do_one_initcall+0x250/0x870 init/main.c:1347 do_initcall_level+0x104/0x190 init/main.c:1409 do_initcalls+0x59/0xa0 init/main.c:1425 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1658 kernel_init+0x1d/0x1d0 init/main.c:1548 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 1: 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:2700 [inline] slab_free mm/slub.c:6284 [inline] kfree+0x1c5/0x6c0 mm/slub.c:6599 vhci_hcd_probe+0x258/0x3f0 drivers/usb/usbip/vhci_hcd.c:1415 platform_probe+0xf9/0x190 drivers/base/platform.c:1432 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1154 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7ec/0xb90 drivers/base/core.c:3702 platform_device_add+0x46a/0x800 drivers/base/platform.c:762 platform_device_register_full+0x60a/0x6f0 drivers/base/platform.c:902 vhci_hcd_init+0x220/0x360 drivers/usb/usbip/vhci_hcd.c:1557 do_one_initcall+0x250/0x870 init/main.c:1347 do_initcall_level+0x104/0x190 init/main.c:1409 do_initcalls+0x59/0xa0 init/main.c:1425 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1658 kernel_init+0x1d/0x1d0 init/main.c:1548 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 insert_work+0x3d/0x330 kernel/workqueue.c:2226 __queue_work+0xd1d/0x1090 kernel/workqueue.c:2393 queue_work_on+0x106/0x1d0 kernel/workqueue.c:2444 rh_call_control drivers/usb/core/hcd.c:705 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:815 [inline] usb_hcd_submit_urb+0x11db/0x1b50 drivers/usb/core/hcd.c:1536 usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:117 [inline] usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167 hub_power_on+0x1b6/0x460 arch/x86/include/asm/bitops.h:-1 hub_activate+0x345/0x1a80 drivers/usb/core/hub.c:1139 hub_configure drivers/usb/core/hub.c:1766 [inline] hub_probe+0x2938/0x3c30 drivers/usb/core/hub.c:2001 usb_probe_interface+0x659/0xc70 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1154 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7ec/0xb90 drivers/base/core.c:3702 usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1154 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7ec/0xb90 drivers/base/core.c:3702 usb_new_device+0x9f8/0x16e0 drivers/usb/core/hub.c:2695 register_root_hub+0x270/0x5f0 drivers/usb/core/hcd.c:988 usb_add_hcd+0xba1/0x10b0 drivers/usb/core/hcd.c:2985 vhci_hcd_probe+0x141/0x3f0 drivers/usb/usbip/vhci_hcd.c:1388 platform_probe+0xf9/0x190 drivers/base/platform.c:1432 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1154 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7ec/0xb90 drivers/base/core.c:3702 platform_device_add+0x46a/0x800 drivers/base/platform.c:762 platform_device_register_full+0x60a/0x6f0 drivers/base/platform.c:902 vhci_hcd_init+0x220/0x360 drivers/usb/usbip/vhci_hcd.c:1557 do_one_initcall+0x250/0x870 init/main.c:1347 do_initcall_level+0x104/0x190 init/main.c:1409 do_initcalls+0x59/0xa0 init/main.c:1425 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1658 kernel_init+0x1d/0x1d0 init/main.c:1548 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Second to last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 insert_work+0x3d/0x330 kernel/workqueue.c:2226 __queue_work+0xd1d/0x1090 kernel/workqueue.c:2393 queue_work_on+0x106/0x1d0 kernel/workqueue.c:2444 rh_call_control drivers/usb/core/hcd.c:705 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:815 [inline] usb_hcd_submit_urb+0x11db/0x1b50 drivers/usb/core/hcd.c:1536 usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:117 [inline] usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167 hub_power_on+0x1b6/0x460 arch/x86/include/asm/bitops.h:-1 hub_activate+0x345/0x1a80 drivers/usb/core/hub.c:1139 hub_configure drivers/usb/core/hub.c:1766 [inline] hub_probe+0x2938/0x3c30 drivers/usb/core/hub.c:2001 usb_probe_interface+0x659/0xc70 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1154 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7ec/0xb90 drivers/base/core.c:3702 usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1154 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7ec/0xb90 drivers/base/core.c:3702 usb_new_device+0x9f8/0x16e0 drivers/usb/core/hub.c:2695 register_root_hub+0x270/0x5f0 drivers/usb/core/hcd.c:988 usb_add_hcd+0xba1/0x10b0 drivers/usb/core/hcd.c:2985 vhci_hcd_probe+0x141/0x3f0 drivers/usb/usbip/vhci_hcd.c:1388 platform_probe+0xf9/0x190 drivers/base/platform.c:1432 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1154 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7ec/0xb90 drivers/base/core.c:3702 platform_device_add+0x46a/0x800 drivers/base/platform.c:762 platform_device_register_full+0x60a/0x6f0 drivers/base/platform.c:902 vhci_hcd_init+0x220/0x360 drivers/usb/usbip/vhci_hcd.c:1557 do_one_initcall+0x250/0x870 init/main.c:1347 do_initcall_level+0x104/0x190 init/main.c:1409 do_initcalls+0x59/0xa0 init/main.c:1425 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1658 kernel_init+0x1d/0x1d0 init/main.c:1548 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88802c394000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 7440 bytes inside of freed 8192-byte region [ffff88802c394000, ffff88802c396000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2c390 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 ffff88813fead280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000 head: 0080000000000040 ffff88813fead280 dead000000000122 0000000000000000 head: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000 head: 0080000000000003 fffffffffffffe01 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 13530620387, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1866 prep_new_page mm/page_alloc.c:1874 [inline] get_page_from_freelist+0x265c/0x26e0 mm/page_alloc.c:3953 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5296 alloc_slab_page mm/slub.c:3289 [inline] allocate_slab+0x74/0x5e0 mm/slub.c:3404 new_slab mm/slub.c:3447 [inline] refill_objects+0x33c/0x3d0 mm/slub.c:7226 refill_sheaf mm/slub.c:2827 [inline] __pcs_replace_empty_main+0x373/0x720 mm/slub.c:4665 alloc_from_pcs mm/slub.c:4763 [inline] slab_alloc_node mm/slub.c:4897 [inline] __do_kmalloc_node mm/slub.c:5308 [inline] __kmalloc_noprof+0x530/0x7b0 mm/slub.c:5322 _kmalloc_noprof include/linux/slab.h:971 [inline] _kzalloc_noprof include/linux/slab.h:1284 [inline] __usb_create_hcd+0x67/0x920 drivers/usb/core/hcd.c:2564 vhci_hcd_probe+0x104/0x3f0 drivers/usb/usbip/vhci_hcd.c:1378 platform_probe+0xf9/0x190 drivers/base/platform.c:1432 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 page_owner free stack trace missing Memory state around the buggy address: ffff88802c395c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802c395c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802c395d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802c395d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802c395e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================