On Mon, May 08, 2023 at 08:51:55AM +0200, Greg Kroah-Hartman wrote: > 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? No, wait, it's still there, I was looking at a development branch of mine that isn't sent upstream yet. And syzbot just reported the same thing: https://lore.kernel.org/r/00000000000058d15f05fb264013@xxxxxxxxxx So something's wrong here, let me dig into it tomorrow when I get a chance... thanks, greg k-h
