On Mon, May 08, 2023 at 08:30:07AM +0200, Mirsad Goran Todorovac wrote: > Hi, > > There seems to be a kernel memory leak in the USB keyboard driver. > > The leaked memory allocs are 96 and 512 bytes. > > The platform is Ubuntu 22.04 LTS on a assembled AMD Ryzen 9 with X670E PG > Lightning mobo, > and Genius SlimStar i220 GK-080012 keyboard. > > (Logitech M100 HID mouse is not affected by the bug.) > > BIOS is: > > *-firmware > description: BIOS > vendor: American Megatrends International, LLC. > physical id: 0 > version: 1.21 > date: 04/26/2023 > size: 64KiB > > The kernel is 6.3.0-torvalds-<id>-13466-gfc4354c6e5c2. > > The keyboard is recognised as Chicony: > > *-usb > description: Keyboard > product: CHICONY USB Keyboard > vendor: CHICONY > physical id: 2 > bus info: usb@5:2 > logical name: input35 > logical name: /dev/input/event4 > logical name: input35::capslock > logical name: input35::numlock > logical name: input35::scrolllock > logical name: input36 > logical name: /dev/input/event5 > logical name: input37 > logical name: /dev/input/event6 > logical name: input38 > logical name: /dev/input/event8 > version: 2.30 > capabilities: usb-2.00 usb > configuration: driver=usbhid maxpower=100mA > speed=1Mbit/s > > The bug is easily reproduced by unplugging the USB keyboard, waiting about a > couple of seconds, > and then reconnect and scan for memory leaks twice. > > The kmemleak log is as follows [edited privacy info]: > > root@hostname:/home/username# cat /sys/kernel/debug/kmemleak > unreferenced object 0xffff8dd020037c00 (size 96): > comm "systemd-udevd", pid 435, jiffies 4294892550 (age 8909.356s) > hex dump (first 32 bytes): > 5d 8e 4e b9 ff ff ff ff 00 00 00 00 00 00 00 00 ].N............. > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [<ffffffffb81a74be>] __kmem_cache_alloc_node+0x22e/0x2b0 > [<ffffffffb8127b6e>] kmalloc_trace+0x2e/0xa0 > [<ffffffffb87543d9>] class_create+0x29/0x80 > [<ffffffffb8880d24>] usb_register_dev+0x1d4/0x2e0 As the call to class_create() in this path is now gone in 6.4-rc1, can you retry that release to see if this is still there or not? thanks, greg k-h
