usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-1: Product: syz usb 1-1: Manufacturer: syz usb 1-1: SerialNumber: syz usb 1-1: config 0 descriptor?? uvcvideo: Found UVC 0.00 device syz (18cd:cafe) ------------[ cut here ]------------ list_add double add: new=ffff8881cfef1010, prev=ffff8881cfef1010, next=ffff8881d4fd5c18. WARNING: CPU: 0 PID: 95 at lib/list_debug.c:29 __list_add_valid+0xb4/0xf0 lib/list_debug.c:29 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 95 Comm: kworker/0:2 Not tainted 5.5.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xef/0x16e lib/dump_stack.c:118 panic+0x2aa/0x6e1 kernel/panic.c:221 __warn.cold+0x2f/0x30 kernel/panic.c:582 report_bug+0x27b/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:__list_add_valid+0xb4/0xf0 lib/list_debug.c:29 Code: 48 c7 c7 20 ef da 85 4c 89 e6 e8 2f b5 2b ff 0f 0b 31 c0 eb c5 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 a0 ef da 85 e8 14 b5 2b ff <0f> 0b 31 c0 eb aa 48 89 34 24 e8 ed 1f 7f ff 48 8b 34 24 e9 60 ff RSP: 0018:ffff8881d6177080 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8881cfef1010 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff812956dd RDI: ffffed103ac2ee02 RBP: ffff8881cfef1010 R08: ffff8881d755c980 R09: ffffed103b686210 R10: ffffed103b68620f R11: ffff8881db43107f R12: ffff8881d4fd5c18 R13: ffff8881cfef1000 R14: dffffc0000000000 R15: ffff8881d4fd5c18 __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] uvc_scan_chain_forward.isra.0+0x4df/0x637 drivers/media/usb/uvc/uvc_driver.c:1526 uvc_scan_chain drivers/media/usb/uvc/uvc_driver.c:1640 [inline] uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1824 [inline] uvc_probe.cold+0x1aee/0x29de drivers/media/usb/uvc/uvc_driver.c:2197 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0x141f/0x1bc0 drivers/base/core.c:2487 usb_set_configuration+0xe38/0x16c0 drivers/usb/core/message.c:2023 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0x141f/0x1bc0 drivers/base/core.c:2487 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537 hub_port_connect drivers/usb/core/hub.c:5184 [inline] hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] port_event drivers/usb/core/hub.c:5470 [inline] hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..