usb 2-1: Using ep0 maxpacket: 8
usb 2-1: New USB device found, idVendor=1de1, idProduct=c102, bcdDevice=4d.89
usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 2-1: config 0 descriptor??
=====================================================
BUG: KMSAN: uninit-value in irqentry_exit_to_kernel_mode_preempt+0xb0/0xc0 include/linux/irq-entry-common.h:464
 irqentry_exit_to_kernel_mode_preempt+0xb0/0xc0 include/linux/irq-entry-common.h:464
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x82/0xa00 kernel/entry/common.c:164
 sysvec_apic_timer_interrupt+0x52/0x90 arch/x86/kernel/apic/apic.c:1061
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697
 pfn_valid arch/x86/include/asm/bitops.h:-1 [inline]
 kmsan_virt_addr_valid arch/x86/include/asm/kmsan.h:94 [inline]
 virt_to_page_or_null+0x145/0x170 mm/kmsan/shadow.c:75
 kmsan_get_metadata+0xf1/0x160 mm/kmsan/shadow.c:141
 kmsan_get_shadow_origin_ptr+0x4a/0xb0 mm/kmsan/shadow.c:102
 get_shadow_origin_ptr mm/kmsan/instrumentation.c:38 [inline]
 __msan_metadata_ptr_for_load_1+0x24/0x40 mm/kmsan/instrumentation.c:91
 strnlen+0x40/0xa0 lib/string.c:432
 strnlen include/linux/fortify-string.h:231 [inline]
 sized_strscpy include/linux/fortify-string.h:307 [inline]
 set_dev_info drivers/base/core.c:4893 [inline]
 dev_vprintk_emit+0x118/0x7a0 drivers/base/core.c:4928
 dev_printk_emit+0x180/0x1b0 drivers/base/core.c:4941
 __dev_printk+0x2a1/0x330 drivers/base/core.c:4953
 _dev_printk+0x1b6/0x1d0 drivers/base/core.c:4970
 __drm_dev_vprintk+0x29b/0x2c0 drivers/gpu/drm/drm_print.c:194
 drm_dev_printk+0x208/0x220 drivers/gpu/drm/drm_print.c:326
 gm12u320_misc_request drivers/gpu/drm/tiny/gm12u320.c:-1 [inline]
 gm12u320_set_ecomode+0x559/0x9a0 drivers/gpu/drm/tiny/gm12u320.c:453
 gm12u320_usb_probe+0x700/0xd40 drivers/gpu/drm/tiny/gm12u320.c:672
 usb_probe_interface+0xd51/0x1440 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x4d5/0xe40 drivers/base/dd.c:709
 __driver_probe_device+0x2fb/0x410 drivers/base/dd.c:871
 driver_probe_device+0x70/0x8f0 drivers/base/dd.c:901
 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:1029
 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:500
 __device_attach+0x3c5/0x5f0 drivers/base/dd.c:1101
 device_initial_probe+0x126/0x170 drivers/base/dd.c:1156
 bus_probe_device+0x287/0x530 drivers/base/bus.c:613
 device_add+0x12e3/0x1c90 drivers/base/core.c:3706
 usb_set_configuration+0x3484/0x3b60 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0xfc/0x290 drivers/usb/core/generic.c:250
 usb_probe_device+0x38d/0x690 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x4d5/0xe40 drivers/base/dd.c:709
 __driver_probe_device+0x2fb/0x410 drivers/base/dd.c:871
 driver_probe_device+0x70/0x8f0 drivers/base/dd.c:901
 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:1029
 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:500
 __device_attach+0x3c5/0x5f0 drivers/base/dd.c:1101
 device_initial_probe+0x126/0x170 drivers/base/dd.c:1156
 bus_probe_device+0x287/0x530 drivers/base/bus.c:613
 device_add+0x12e3/0x1c90 drivers/base/core.c:3706
 usb_new_device+0x106a/0x2120 drivers/usb/core/hub.c:2695
 hub_port_connect drivers/usb/core/hub.c:5567 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x5404/0x77c0 drivers/usb/core/hub.c:5953
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xb65/0x1e40 kernel/workqueue.c:3397
 worker_thread+0xee4/0x1590 kernel/workqueue.c:3478
 kthread+0x53a/0x5f0 kernel/kthread.c:436
 ret_from_fork+0x20f/0x8d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Local variable len.i created at:
 gm12u320_misc_request drivers/gpu/drm/tiny/gm12u320.c:204 [inline]
 gm12u320_set_ecomode+0x94/0x9a0 drivers/gpu/drm/tiny/gm12u320.c:453
 gm12u320_usb_probe+0x700/0xd40 drivers/gpu/drm/tiny/gm12u320.c:672

CPU: 1 UID: 0 PID: 5792 Comm: kworker/1:4 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: usb_hub_wq hub_event
=====================================================