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:710 Read of size 8 at addr ffff0000f307fcf0 by task syz.5.592/7309 CPU: 1 UID: 0 PID: 7309 Comm: syz.5.592 Not tainted syzkaller #0 PREEMPT 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:710 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 40: 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] __kmalloc_cache_noprof+0x2e8/0x5ec mm/slub.c:5489 _kmalloc_noprof include/linux/slab.h:988 [inline] __hw_addr_create+0x70/0x234 net/core/dev_addr_lists.c:62 __hw_addr_add_ex+0x1b0/0x460 net/core/dev_addr_lists.c:120 __dev_mc_add+0x9c/0x10c net/core/dev_addr_lists.c:998 dev_mc_add+0x2c/0x3c net/core/dev_addr_lists.c:1016 igmp6_group_added+0x1d0/0x430 net/ipv6/mcast.c:681 __ipv6_dev_mc_inc+0x7d0/0x9e4 net/ipv6/mcast.c:972 ipv6_dev_mc_inc+0x2c/0x3c net/ipv6/mcast.c:981 addrconf_join_solict+0xec/0x170 net/ipv6/addrconf.c:2262 addrconf_dad_begin net/ipv6/addrconf.c:4134 [inline] addrconf_dad_work+0x1ec/0xfe8 net/ipv6/addrconf.c:4262 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0x788/0x10b8 kernel/workqueue.c:3405 worker_thread+0x798/0xbd0 kernel/workqueue.c:3486 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 The buggy address belongs to the object at ffff0000f307fc00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 136 bytes to the right of allocated 104-byte region [ffff0000f307fc00, ffff0000f307fc68) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13307f 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: ffff0000f307fb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f307fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc >ffff0000f307fc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000f307fd00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f307fd80: 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:710 at dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:710, CPU#0: syz.5.592/7309 Modules linked in: CPU: 0 UID: 0 PID: 7309 Comm: syz.5.592 Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE 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:710 lr : dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:710 sp : ffff800092e874e0 x29: ffff800092e874e0 x28: 0000000000000000 x27: ffff0000dbdae528 x26: ffff0000c684f800 x25: 1fffe0001b7b5ca5 x24: dfff800000000000 x23: dfff800000000000 x22: ffff800088b07eb8 x21: ffff800087332200 x20: ffff0000ca2a4068 x19: ffff0000f307fcf0 x18: 1fffe00035bc5428 x17: 0000000000000003 x16: ffff800088b07000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000080000 x9 : 0000000000018821 x8 : ffff8000951f9000 x7 : 0000000000000000 x6 : ffff80008048de94 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f7b18 x2 : 0000000000000000 x1 : ffff0000cfa057c0 x0 : 0000000000000001 Call trace: dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:710 (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: 913 hardirqs last enabled at (913): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1673 [inline] hardirqs last enabled at (913): [] finish_lock_switch kernel/sched/core.c:5241 [inline] hardirqs last enabled at (913): [] finish_task_switch+0x234/0x858 kernel/sched/core.c:5359 hardirqs last disabled at (912): [] __schedule+0x2f8/0x2d80 kernel/sched/core.c:7087 softirqs last enabled at (794): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (794): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (794): [] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1797 softirqs last disabled at (792): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (792): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (792): [] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1790 ---[ 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