usb 4-1: New USB device found, idVendor=0547, idProduct=2235, bcdDevice= 0.00 usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 4-1: Product: syz usb 4-1: Manufacturer: syz usb 4-1: SerialNumber: syz general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 4285 Comm: kworker/0:3 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:usbtest_probe+0x516/0xcb0 drivers/usb/misc/usbtest.c:2821 Code: 10 fb 45 85 ff 78 0a e8 f8 09 10 fb e9 92 00 00 00 48 8b 04 24 4c 8d 78 0a 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 bf 06 00 00 45 0f b6 3f 44 89 fe 83 e6 01 RSP: 0018:ffffc90004096fb0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: ffff8880584d3000 RCX: dffffc0000000000 RDX: ffff88807c545a00 RSI: 00000000ffffffff RDI: 00000000ffffffff RBP: 1ffff1100f168b5b R08: ffffffff90b0f2af R09: 1ffffffff2161e55 R10: dffffc0000000000 R11: fffffbfff2161e56 R12: ffff888078b45a00 R13: 1ffff1100f168b40 R14: ffff888078b45ad8 R15: 000000000000000a FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c34f891 CR3: 000000005c01a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: usb_probe_interface+0x5be/0xae0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:638 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834 __device_attach_driver+0x2c6/0x510 drivers/base/dd.c:962 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2a7/0x480 drivers/base/dd.c:1034 bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489 device_add+0xbcf/0x1050 drivers/base/core.c:3712 usb_set_configuration+0x19d5/0x2030 drivers/usb/core/message.c:2223 usb_generic_driver_probe+0x89/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x126/0x250 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:638 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834 __device_attach_driver+0x2c6/0x510 drivers/base/dd.c:962 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2a7/0x480 drivers/base/dd.c:1034 bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489 device_add+0xbcf/0x1050 drivers/base/core.c:3712 usb_new_device+0xa01/0x15e0 drivers/usb/core/hub.c:2659 hub_port_connect drivers/usb/core/hub.c:5517 [inline] hub_port_connect_change drivers/usb/core/hub.c:5657 [inline] port_event drivers/usb/core/hub.c:5817 [inline] hub_event+0x2b2f/0x5200 drivers/usb/core/hub.c:5899 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:usbtest_probe+0x516/0xcb0 drivers/usb/misc/usbtest.c:2821 Code: 10 fb 45 85 ff 78 0a e8 f8 09 10 fb e9 92 00 00 00 48 8b 04 24 4c 8d 78 0a 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 bf 06 00 00 45 0f b6 3f 44 89 fe 83 e6 01 RSP: 0018:ffffc90004096fb0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: ffff8880584d3000 RCX: dffffc0000000000 RDX: ffff88807c545a00 RSI: 00000000ffffffff RDI: 00000000ffffffff RBP: 1ffff1100f168b5b R08: ffffffff90b0f2af R09: 1ffffffff2161e55 R10: dffffc0000000000 R11: fffffbfff2161e56 R12: ffff888078b45a00 R13: 1ffff1100f168b40 R14: ffff888078b45ad8 R15: 000000000000000a FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3e0ce4 CR3: 000000002eafc000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 10 fb adc %bh,%bl 2: 45 85 ff test %r15d,%r15d 5: 78 0a js 0x11 7: e8 f8 09 10 fb call 0xfb100a04 c: e9 92 00 00 00 jmp 0xa3 11: 48 8b 04 24 mov (%rsp),%rax 15: 4c 8d 78 0a lea 0xa(%rax),%r15 19: 4c 89 f8 mov %r15,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 bf 06 00 00 jne 0x6f5 36: 45 0f b6 3f movzbl (%r15),%r15d 3a: 44 89 fe mov %r15d,%esi 3d: 83 e6 01 and $0x1,%esi