configfs-gadget.g1 gadget.0: uvc: uvc_function_bind() configfs-gadget.g1 gadget.0: uvc: Unable to allocate streaming EP ================================================================== BUG: KASAN: slab-out-of-bounds in list_empty include/linux/list.h:404 [inline] BUG: KASAN: slab-out-of-bounds in dummy_free_request+0x44/0x84 drivers/usb/gadget/udc/dummy_hcd.c:691 Read of size 8 at addr ffff0000d1d928f0 by task syz.7.2247/12252 CPU: 0 UID: 0 PID: 12252 Comm: syz.7.2247 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 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+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 list_empty include/linux/list.h:404 [inline] dummy_free_request+0x44/0x84 drivers/usb/gadget/udc/dummy_hcd.c:691 usb_ep_free_request+0x108/0x3fc drivers/usb/gadget/udc/core.c:221 uvc_function_bind+0xbb0/0x1230 drivers/usb/gadget/function/f_uvc.c:893 usb_add_function+0x1d0/0x6bc drivers/usb/gadget/composite.c:333 configfs_composite_bind+0xb4c/0x10b8 drivers/usb/gadget/configfs.c:1802 gadget_bind_driver+0x274/0x834 drivers/usb/gadget/udc/core.c:1662 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x29c/0x800 drivers/base/dd.c:706 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898 __driver_attach+0x168/0x384 drivers/base/dd.c:1292 bus_for_each_dev+0x128/0x1b4 drivers/base/bus.c:383 driver_attach+0x50/0x60 drivers/base/dd.c:1310 bus_add_driver+0x208/0x500 drivers/base/bus.c:763 driver_register+0x220/0x310 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0xf0/0x25c drivers/usb/gadget/udc/core.c:1752 gadget_dev_desc_UDC_store+0x164/0x22c drivers/usb/gadget/configfs.c:300 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x27c/0x354 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c 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+0x7c/0x90 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:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Allocated by task 11815: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5362 [inline] __kmalloc_noprof+0x340/0x6b8 mm/slub.c:5387 _kmalloc_noprof include/linux/slab.h:973 [inline] copy_gadget_strings drivers/usb/gadget/composite.c:1422 [inline] usb_gstrings_attach+0xb8/0x6a4 drivers/usb/gadget/composite.c:1488 uvc_function_bind+0x654/0x1230 drivers/usb/gadget/function/f_uvc.c:794 usb_add_function+0x1d0/0x6bc drivers/usb/gadget/composite.c:333 configfs_composite_bind+0xb4c/0x10b8 drivers/usb/gadget/configfs.c:1802 gadget_bind_driver+0x274/0x834 drivers/usb/gadget/udc/core.c:1662 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x29c/0x800 drivers/base/dd.c:706 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898 __driver_attach+0x168/0x384 drivers/base/dd.c:1292 bus_for_each_dev+0x128/0x1b4 drivers/base/bus.c:383 driver_attach+0x50/0x60 drivers/base/dd.c:1310 bus_add_driver+0x208/0x500 drivers/base/bus.c:763 driver_register+0x220/0x310 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0xf0/0x25c drivers/usb/gadget/udc/core.c:1752 gadget_dev_desc_UDC_store+0x164/0x22c drivers/usb/gadget/configfs.c:300 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x27c/0x354 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c 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+0x7c/0x90 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:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Freed by task 11815: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2705 [inline] slab_free mm/slub.c:6405 [inline] kfree+0x188/0x690 mm/slub.c:6720 composite_dev_cleanup+0x128/0x544 drivers/usb/gadget/composite.c:2492 configfs_composite_unbind+0xa0/0x18c drivers/usb/gadget/configfs.c:1847 gadget_unbind_driver+0x188/0x790 drivers/usb/gadget/udc/core.c:1724 device_remove+0xc4/0x134 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1372 driver_detach+0x124/0x1b4 drivers/base/dd.c:1435 bus_remove_driver+0x124/0x22c drivers/base/bus.c:832 driver_unregister+0x78/0xac drivers/base/driver.c:202 usb_gadget_unregister_driver+0x50/0x78 drivers/usb/gadget/udc/core.c:1784 unregister_gadget+0x4c/0xc0 drivers/usb/gadget/configfs.c:263 gadget_dev_desc_UDC_store+0x120/0x22c drivers/usb/gadget/configfs.c:290 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x27c/0x354 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c 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+0x7c/0x90 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:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 The buggy address belongs to the object at ffff0000d1d92800 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 112 bytes to the right of allocated 128-byte region [ffff0000d1d92800, ffff0000d1d92880) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x111d92 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000000 ffff0000c0001a00 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d1d92780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d1d92800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d1d92880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000d1d92900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d1d92980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ------------[ cut here ]------------ WARNING: drivers/usb/gadget/udc/dummy_hcd.c:691 at dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:691, CPU#0: syz.7.2247/12252 Modules linked in: CPU: 0 UID: 0 PID: 12252 Comm: syz.7.2247 Tainted: G B L syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:691 lr : dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:691 sp : ffff800094ab74e0 x29: ffff800094ab74e0 x28: 0000000000000000 x27: ffff0000d020e528 x26: ffff0000d9fc3000 x25: 1fffe0001a041ca5 x24: dfff800000000000 x23: dfff800000000000 x22: ffff800088b07eb8 x21: ffff800087332040 x20: ffff0000c8478068 x19: ffff0000d1d928f0 x18: 1fffe00035bc5428 x17: 0000000000000003 x16: ffff800088b07000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000080000 x9 : 0000000000023b93 x8 : ffff80009c5cc000 x7 : 0000000000000000 x6 : ffff80008048de94 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f7b18 x2 : 0000000000000000 x1 : ffff0000c8159d40 x0 : 0000000000000001 Call trace: dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:691 (P) usb_ep_free_request+0x108/0x3fc drivers/usb/gadget/udc/core.c:221 uvc_function_bind+0xbb0/0x1230 drivers/usb/gadget/function/f_uvc.c:893 usb_add_function+0x1d0/0x6bc drivers/usb/gadget/composite.c:333 configfs_composite_bind+0xb4c/0x10b8 drivers/usb/gadget/configfs.c:1802 gadget_bind_driver+0x274/0x834 drivers/usb/gadget/udc/core.c:1662 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x29c/0x800 drivers/base/dd.c:706 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898 __driver_attach+0x168/0x384 drivers/base/dd.c:1292 bus_for_each_dev+0x128/0x1b4 drivers/base/bus.c:383 driver_attach+0x50/0x60 drivers/base/dd.c:1310 bus_add_driver+0x208/0x500 drivers/base/bus.c:763 driver_register+0x220/0x310 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0xf0/0x25c drivers/usb/gadget/udc/core.c:1752 gadget_dev_desc_UDC_store+0x164/0x22c drivers/usb/gadget/configfs.c:300 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x27c/0x354 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c 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+0x7c/0x90 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:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 irq event stamp: 817 hardirqs last enabled at (817): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1673 [inline] hardirqs last enabled at (817): [] finish_lock_switch kernel/sched/core.c:5241 [inline] hardirqs last enabled at (817): [] finish_task_switch+0x234/0x858 kernel/sched/core.c:5359 hardirqs last disabled at (816): [] __schedule+0x2f8/0x2d80 kernel/sched/core.c:7087 softirqs last enabled at (802): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (802): [] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650 softirqs last disabled at (693): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 ---[ end trace 0000000000000000 ]--- udc dummy_udc.0: failed to start g1: -22 configfs-gadget.g1 gadget.0: probe with driver configfs-gadget.g1 failed with error -22 UDC core: g1: couldn't find an available UDC or it's busy