syzbot

keyspan 4-1:0.186: Keyspan - (without firmware) converter detected
usb 4-1: Direct firmware load for keyspan/usa19w.fw failed with error -2
usb 4-1: Falling back to sysfs fallback for: keyspan/usa19w.fw
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5938 at drivers/base/firmware_loader/fallback.c:148 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:148 [inline]
WARNING: CPU: 0 PID: 5938 at drivers/base/firmware_loader/fallback.c:148 firmware_fallback_sysfs+0x746/0x9b0 drivers/base/firmware_loader/fallback.c:238
Modules linked in:
CPU: 0 UID: 0 PID: 5938 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:148 [inline]
RIP: 0010:firmware_fallback_sysfs+0x746/0x9b0 drivers/base/firmware_loader/fallback.c:238
Code: b9 fb e9 5d fc ff ff e8 18 7c b9 fb c6 05 e1 4a 87 09 01 48 c7 c7 60 8b 0a 8c e8 25 70 21 fb e9 85 fc ff ff e8 fb 7b b9 fb 90 <0f> 0b 90 4c 89 f7 48 c7 c6 40 8c 0a 8c 4c 89 e2 e8 65 63 26 fb e9
RSP: 0018:ffffc9000431e8b0 EFLAGS: 00010246
RAX: ffffffff86062f85 RBX: dffffc0000000000 RCX: 0000000000100000
RDX: ffffc90019512000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: 0000000000000001 R08: ffffffff8fa38637 R09: 1ffffffff1f470c6
R10: dffffc0000000000 R11: fffffbfff1f470c7 R12: ffffffff8c3f2b60
R13: 0000000000001770 R14: ffff8880212e90b0 R15: 00000000fffffff5
FS:  0000000000000000(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558af335c8 CR3: 000000000df36000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 _request_firmware+0xf83/0x15b0 drivers/base/firmware_loader/main.c:906
 request_firmware+0x36/0x50 drivers/base/firmware_loader/main.c:957
 request_ihex_firmware include/linux/ihex.h:71 [inline]
 ezusb_ihex_firmware_download drivers/usb/misc/ezusb.c:66 [inline]
 ezusb_fx1_ihex_firmware_download+0xb0/0xcf0 drivers/usb/misc/ezusb.c:123
 keyspan_fake_startup+0x230/0x430 drivers/usb/serial/keyspan.c:1675
 usb_serial_probe+0x2509/0x2d20 drivers/usb/serial/usb-serial.c:1123
 usb_probe_interface+0x665/0xc30 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26d/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c4/0x390 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26d/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 usb_new_device+0xa39/0x16f0 drivers/usb/core/hub.c:2694
 hub_port_connect drivers/usb/core/hub.c:5566 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x2958/0x4a20 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>